Euan A. Ashley

All Publications

• Allele-Specific Silencing Ameliorates Restrictive Cardiomyopathy Due to a Human Myosin Regulatory Light Chain Mutation. Circulation Zaleta-Rivera, K., Dainis, A., Ribeiro, A. J., Sanchez Cordero, P., Rubio, G., Shang, C., Liu, J., Finsterbach, T., Parikh, V. N., Sutton, S., Seo, K., Sinha, N., Jain, N., Huang, Y., Hajjar, R. J., Kay, M. A., Szczesna-Cordary, D., Pruitt, B. L., Wheeler, M. T., Ashley, E. A. 2019

  Abstract

  BACKGROUND: Restrictive cardiomyopathy (RCM) is a rare heart disease associated with mutations in sarcomeric genes and with phenotypic overlap with hypertrophic cardiomyopathy. There is no approved therapy. Here, we explore the potential of an interfering RNA (RNAi) therapeutic for a human sarcomeric mutation in MYL2 causative of restrictive cardiomyopathy in a mouse model.METHODS: AAV9-M7.8L shRNA was selected from a pool of RNAi oligonucleotides containing the SNV in different positions to specifically target the mutated allele causative of RCM by FACS screening. Two groups of RLC-N47K transgenic mice were injected with a single dose of AAV9-M7.8L shRNA at 3 days of age and at 60 days of age. Mice were subjected to treadmill exercise and echocardiography after treatment to determine VO2max and left ventricular mass. At the end of treatment, heart, lung, liver and kidney tissue was harvested to determine viral tropism and for transcriptome and proteomic analysis. Cardiomyocytes were isolated for single cell studies.RESULTS: One time injection of AAV9-M7.8L RNAi in 3-day-old humanized RLC mutant transgenic mice silenced the mutated allele (RLC-47K) with minimal effects on the normal allele (RLC-47N) assayed 16 weeks post-injection. AAV9-M7.8L RNAi suppressed the expression of hypertrophic biomarkers, reduced heart weight and attenuated a pathological increase in left ventricular mass (LVM). Single adult cardiac myocytes from mice treated with AAV9-M7.8L showed partial restoration of the maximal contraction velocity with marked reduction in hypercontractility as well as relaxation kinetics and improved time to maximal calcium reuptake velocity. In addition, cardiac stress protein biomarkers, such as calmodulin-dependent protein kinase II (CAMKII) and the transcription activator Brg1 were reduced suggesting recovery towards a healthy myocardium. Transcriptome analyses further revealed no significant changes of argonaute (AGO1, AGO2) and endoribonuclease dicer (DICER1) transcripts while endogenous microRNAs were preserved suggesting the RNAi pathway was not saturated.CONCLUSIONS: Our results show the feasibility, efficacy, and safety of RNAi therapeutics directed at human restrictive cardiomyopathy. This is a promising step towards targeted therapy for a prevalent human disease.

  View details for DOI 10.1161/CIRCULATIONAHA.118.036965

  View details for PubMedID 31315475

• Rapid Genome Sequencing in the Critically Ill CLINICAL CHEMISTRY Buchan, J. G., White, S., Joshi, R., Ashley, E. A. 2019; 65 (6): 723?26

  View details for DOI 10.1373/clinchem.2018.293506

  View details for Web of Science ID 000469222900004

• Targeted Long-Read RNA Sequencing Demonstrates Transcriptional Diversity Driven by Splice-Site Variation in MYBPC3. Circulation. Genomic and precision medicine Dainis, A., Tseng, E., Clark, T. A., Hon, T., Wheeler, M., Ashley, E. 2019; 12 (5): e002464

  View details for DOI 10.1161/CIRCGEN.119.002464

  View details for PubMedID 31112421

• Physical activity, sleep and cardiovascular health data for 50,000 individuals from the MyHeart Counts Study SCIENTIFIC DATA Hershman, S. G., Bot, B. M., Shcherbina, A., Doerr, M., Moayedi, Y., Pavlovic, A., Waggott, D., Cho, M. K., Rosenberger, M. E., Haskell, W. L., Myers, J., Champagne, M., Mignot, E., Salvi, D., Landray, M., Tarassenko, L., Harrington, R. A., Yeung, A. C., McConnell, M. V., Ashley, E. A. 2019; 6

  View details for DOI 10.1038/s41597-019-0016-7

  View details for Web of Science ID 000464198800001

• Identification of rare-disease genes using blood transcriptome sequencing and large control cohorts. Nature medicine Frésard, L., Smail, C., Ferraro, N. M., Teran, N. A., Li, X., Smith, K. S., Bonner, D., Kernohan, K. D., Marwaha, S., Zappala, Z., Balliu, B., Davis, J. R., Liu, B., Prybol, C. J., Kohler, J. N., Zastrow, D. B., Reuter, C. M., Fisk, D. G., Grove, M. E., Davidson, J. M., Hartley, T., Joshi, R., Strober, B. J., Utiramerur, S., Lind, L., Ingelsson, E., Battle, A., Bejerano, G., Bernstein, J. A., Ashley, E. A., Boycott, K. M., Merker, J. D., Wheeler, M. T., Montgomery, S. B. 2019

  Abstract

  It is estimated that 350 million individuals worldwide suffer from rare diseases, which are predominantly caused by mutation in a single gene1. The current molecular diagnostic rate is estimated at 50%, with whole-exome sequencing (WES) among the most successful approaches2-5. For patients in whom WES is uninformative, RNA sequencing (RNA-seq) has shown diagnostic utility in specific tissues and diseases6-8. This includes muscle biopsies from patients with undiagnosed rare muscle disorders6,9, and cultured fibroblasts from patients with mitochondrial disorders7. However, for many individuals, biopsies are not performed for clinical care, and tissues are difficult to access. We sought to assess the utility of RNA-seq from blood as a diagnostic tool for rare diseases of different pathophysiologies. We generated whole-blood RNA-seq from 94 individuals with undiagnosed rare diseases spanning 16 diverse disease categories. We developed a robust approach to compare data from these individuals with large sets of RNA-seq data for controls (n?=?1,594 unrelated controls and n?=?49 family members) and demonstrated the impacts of expression, splicing, gene and variant filtering strategies on disease gene identification. Across our cohort, we observed that RNA-seq yields a 7.5% diagnostic rate, and an additional 16.7% with improved candidate gene resolution.

  View details for DOI 10.1038/s41591-019-0457-8

  View details for PubMedID 31160820

• Weakly supervised classification of rare aortic valve malformations using unlabeled cardiac MRI sequences Nature Communications Fries, J. A., Varma, P., Chen, V. S., Xiao, K., Tejeda, H., Saha, P., Dunnmon, J., Chubb, H., Maskatia, S., Fiterau, M., Delp, S., Ashley, E., Ré, C., Priest, J. R. 2019; 10

  View details for DOI 10.1038/s41467-019-11012-3

• Pathologic gene network rewiring implicates PPP1R3A as a central regulator in pressure overload heart failure. Nature communications Cordero, P., Parikh, V. N., Chin, E. T., Erbilgin, A., Gloudemans, M. J., Shang, C., Huang, Y., Chang, A. C., Smith, K. S., Dewey, F., Zaleta, K., Morley, M., Brandimarto, J., Glazer, N., Waggott, D., Pavlovic, A., Zhao, M., Moravec, C. S., Tang, W. H., Skreen, J., Malloy, C., Hannenhalli, S., Li, H., Ritter, S., Li, M., Bernstein, D., Connolly, A., Hakonarson, H., Lusis, A. J., Margulies, K. B., Depaoli-Roach, A. A., Montgomery, S. B., Wheeler, M. T., Cappola, T., Ashley, E. A. 2019; 10 (1): 2760

  Abstract

  Heart failure is a leading cause of mortality, yet our understanding of the genetic interactions underlying this disease remains incomplete. Here, we harvest 1352 healthy and failing human hearts directly from transplant center operating rooms, and obtain genome-wide genotyping and gene expression measurements for a subset of 313. We build failing and non-failing cardiac regulatory gene networks, revealing important regulators and cardiac expression quantitative trait loci (eQTLs). PPP1R3A emerges as a regulator whose network connectivity changes significantly between health and disease. RNA sequencing after PPP1R3A knockdown validates network-based predictions, and highlights metabolic pathway regulation associated with increased cardiomyocyte size and perturbed respiratory metabolism. Mice lacking PPP1R3A are protected against pressure-overload heart failure. We present a global gene interaction map of the human heart failure transition, identify previously unreported cardiac eQTLs, and demonstrate the discovery potential of disease-specific networks through the description of PPP1R3A as a central regulator in heart failure.

  View details for DOI 10.1038/s41467-019-10591-5

  View details for PubMedID 31235787

• Cardiovascular disease: The rise of the genetic risk score PLOS MEDICINE Knowles, J. W., Ashley, E. A. 2018; 15 (3): e1002546

  Abstract

  In a Perspective, Joshua Knowles and Euan Ashley discuss the potential for use of genetic risk scores in clinical practice.

  View details for PubMedID 29601582

• Effect of Genetic Diagnosis on Patients with Previously Undiagnosed Disease. The New England journal of medicine Splinter, K., Adams, D. R., Bacino, C. A., Bellen, H. J., Bernstein, J. A., Cheatle-Jarvela, A. M., Eng, C. M., Esteves, C., Gahl, W. A., Hamid, R., Jacob, H. J., Kikani, B., Koeller, D. M., Kohane, I. S., Lee, B. H., Loscalzo, J., Luo, X., McCray, A. T., Metz, T. O., Mulvihill, J. J., Nelson, S. F., Palmer, C. G., Phillips, J. A., Pick, L., Postlethwait, J. H., Reuter, C., Shashi, V., Sweetser, D. A., Tifft, C. J., Walley, N. M., Wangler, M. F., Westerfield, M., Wheeler, M. T., Wise, A. L., Worthey, E. A., Yamamoto, S., Ashley, E. A. 2018

  Abstract

  Many patients remain without a diagnosis despite extensive medical evaluation. The Undiagnosed Diseases Network (UDN) was established to apply a multidisciplinary model in the evaluation of the most challenging cases and to identify the biologic characteristics of newly discovered diseases. The UDN, which is funded by the National Institutes of Health, was formed in 2014 as a network of seven clinical sites, two sequencing cores, and a coordinating center. Later, a central biorepository, a metabolomics core, and a model organisms screening center were added.We evaluated patients who were referred to the UDN over a period of 20 months. The patients were required to have an undiagnosed condition despite thorough evaluation by a health care provider. We determined the rate of diagnosis among patients who subsequently had a complete evaluation, and we observed the effect of diagnosis on medical care.A total of 1519 patients (53% female) were referred to the UDN, of whom 601 (40%) were accepted for evaluation. Of the accepted patients, 192 (32%) had previously undergone exome sequencing. Symptoms were neurologic in 40% of the applicants, musculoskeletal in 10%, immunologic in 7%, gastrointestinal in 7%, and rheumatologic in 6%. Of the 382 patients who had a complete evaluation, 132 received a diagnosis, yielding a rate of diagnosis of 35%. A total of 15 diagnoses (11%) were made by clinical review alone, and 98 (74%) were made by exome or genome sequencing. Of the diagnoses, 21% led to recommendations regarding changes in therapy, 37% led to changes in diagnostic testing, and 36% led to variant-specific genetic counseling. We defined 31 new syndromes.The UDN established a diagnosis in 132 of the 382 patients who had a complete evaluation, yielding a rate of diagnosis of 35%. (Funded by the National Institutes of Health Common Fund.).

  View details for PubMedID 30304647

• Effect of Moderate-Intensity Exercise Training on Peak Oxygen Consumption in Patients With Hypertrophic Cardiomyopathy A Randomized Clinical Trial JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION Saberi, S., Wheeler, M., Bragg-Gresham, J., Hornsby, W., Agarwal, P. P., Attili, A., Concannon, M., Dries, A. M., Shmargad, Y., Salisbury, H., Kumar, S., Herrera, J., Myers, J., Helms, A. S., Ashley, E. A., Day, S. M. 2017; 317 (13): 1349-1357

  Abstract

  Formulating exercise recommendations for patients with hypertrophic cardiomyopathy is challenging because of concern about triggering ventricular arrhythmias and because a clinical benefit has not been previously established in this population.To determine whether moderate-intensity exercise training improves exercise capacity in adults with hypertrophic cardiomyopathy.A randomized clinical trial involving 136 patients with hypertrophic cardiomyopathy was conducted between April 2010 and October 2015 at 2 academic medical centers in the United States (University of Michigan Health System and Stanford University Medical Center). Date of last follow-up was November 2016.Participants were randomly assigned to 16 weeks of moderate-intensity exercise training (n?=?67) or usual activity (n?=?69).The primary outcome measure was change in peak oxygen consumption from baseline to 16 weeks.Among the 136 randomized participants (mean age, 50.4 [SD, 13.3] years; 42% women), 113 (83%) completed the study. At 16 weeks, the change in mean peak oxygen consumption was +1.35 (95% CI, 0.50 to 2.21) mL/kg/min among participants in the exercise training group and +0.08 (95% CI, -0.62 to 0.79) mL/kg/min among participants in the usual-activity group (between-group difference, 1.27 [95% CI, 0.17 to 2.37]; P?=?.02). There were no occurrences of sustained ventricular arrhythmia, sudden cardiac arrest, appropriate defibrillator shock, or death in either group.In this preliminary study involving patients with hypertrophic cardiomyopathy, moderate-intensity exercise compared with usual activity resulted in a statistically significant but small increase in exercise capacity at 16 weeks. Further research is needed to understand the clinical importance of this finding in patients with hypertrophic cardiomyopathy, as well as the long-term safety of exercise at moderate and higher levels of intensity.clinicaltrials.gov Identifier: NCT01127061.

  View details for DOI 10.1001/jama.2017.2503

  View details for Web of Science ID 000398434200019

  View details for PubMedID 28306757

• The Changing Face of Informed Consent NEW ENGLAND JOURNAL OF MEDICINE Grady, C., Cummings, S. R., Rowbotham, M. C., McConnell, M. V., Ashley, E. A., Kang, G. 2017; 376 (9): 856-867

  View details for Web of Science ID 000395627500009

• Feasibility of Obtaining Measures of Lifestyle From a Smartphone App: The MyHeart Counts Cardiovascular Health Study. JAMA cardiology McConnell, M. V., Shcherbina, A., Pavlovic, A., Homburger, J. R., Goldfeder, R. L., Waggot, D., Cho, M. K., Rosenberger, M. E., Haskell, W. L., Myers, J., Champagne, M. A., Mignot, E., Landray, M., Tarassenko, L., Harrington, R. A., Yeung, A. C., Ashley, E. A. 2017; 2 (1): 67-76

  Abstract

  Studies have established the importance of physical activity and fitness, yet limited data exist on the associations between objective, real-world physical activity patterns, fitness, sleep, and cardiovascular health.To assess the feasibility of obtaining measures of physical activity, fitness, and sleep from smartphones and to gain insights into activity patterns associated with life satisfaction and self-reported disease.The MyHeart Counts smartphone app was made available in March 2015, and prospective participants downloaded the free app between March and October 2015. In this smartphone-based study of cardiovascular health, participants recorded physical activity, filled out health questionnaires, and completed a 6-minute walk test. The app was available to download within the United States.The feasibility of consent and data collection entirely on a smartphone, the use of machine learning to cluster participants, and the associations between activity patterns, life satisfaction, and self-reported disease.From the launch to the time of the data freeze for this study (March to October 2015), the number of individuals (self-selected) who consented to participate was 48?968, representing all 50 states and the District of Columbia. Their median age was 36 years (interquartile range, 27-50 years), and 82.2% (30?338 male, 6556 female, 10 other, and 3115 unknown) were male. In total, 40?017 (81.7% of those who consented) uploaded data. Among those who consented, 20?345 individuals (41.5%) completed 4 of the 7 days of motion data collection, and 4552 individuals (9.3%) completed all 7 days. Among those who consented, 40?017 (81.7%) filled out some portion of the questionnaires, and 4990 (10.2%) completed the 6-minute walk test, made available only at the end of 7 days. The Heart Age Questionnaire, also available after 7 days, required entering lipid values and age 40 to 79 years (among 17?245 individuals, 43.1% of participants). Consequently, 1334 (2.7%) of those who consented completed all fields needed to compute heart age and a 10-year risk score. Physical activity was detected for a mean (SD) of 14.5% (8.0%) of individuals' total recorded time. Physical activity patterns were identified by cluster analysis. A pattern of lower overall activity but more frequent transitions between active and inactive states was associated with equivalent self-reported cardiovascular disease as a pattern of higher overall activity with fewer transitions. Individuals' perception of their activity and risk bore little relation to sensor-estimated activity or calculated cardiovascular risk.A smartphone-based study of cardiovascular health is feasible, and improvements in participant diversity and engagement will maximize yield from consented participants. Large-scale, real-world assessment of physical activity, fitness, and sleep using mobile devices may be a useful addition to future population health studies.

  View details for DOI 10.1001/jamacardio.2016.4395

  View details for PubMedID 27973671

• Long-read genome sequencing identifies causal structural variation in a Mendelian disease. Genetics in medicine : official journal of the American College of Medical Genetics Merker, J. D., Wenger, A. M., Sneddon, T., Grove, M., Zappala, Z., Fresard, L., Waggott, D., Utiramerur, S., Hou, Y., Smith, K. S., Montgomery, S. B., Wheeler, M., Buchan, J. G., Lambert, C. C., Eng, K. S., Hickey, L., Korlach, J., Ford, J., Ashley, E. A. 2017

  Abstract

  PurposeCurrent clinical genomics assays primarily utilize short-read sequencing (SRS), but SRS has limited ability to evaluate repetitive regions and structural variants. Long-read sequencing (LRS) has complementary strengths, and we aimed to determine whether LRS could offer a means to identify overlooked genetic variation in patients undiagnosed by SRS.MethodsWe performed low-coverage genome LRS to identify structural variants in a patient who presented with multiple neoplasia and cardiac myxomata, in whom the results of targeted clinical testing and genome SRS were negative.ResultsThis LRS approach yielded 6,971 deletions and 6,821 insertions?>?50?bp. Filtering for variants that are absent in an unrelated control and overlap a disease gene coding exon identified three deletions and three insertions. One of these, a heterozygous 2,184?bp deletion, overlaps the first coding exon of PRKAR1A, which is implicated in autosomal dominant Carney complex. RNA sequencing demonstrated decreased PRKAR1A expression. The deletion was classified as pathogenic based on guidelines for interpretation of sequence variants.ConclusionThis first successful application of genome LRS to identify a pathogenic variant in a patient suggests that LRS has significant potential for the identification of disease-causing structural variation. Larger studies will ultimately be required to evaluate the potential clinical utility of LRS.GENETICS in MEDICINE advance online publication, 22 June 2017; doi:10.1038/gim.2017.86.

  View details for PubMedID 28640241

• Early somatic mosaicism is a rare cause of long-QT syndrome PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Priest, J. R., Gawad, C., Kahlig, K. M., Yu, J. K., O'Hara, T., Boyle, P. M., Rajamani, S., Clark, M. J., Garcia, S. T., Ceresnak, S., Harris, J., Boyle, S., Dewey, F. E., Malloy-Walton, L., Dunn, K., Grove, M., Perez, M. V., Neff, N. F., Chen, R., Maeda, K., Dubin, A., Belardinelli, L., West, J., Antolik, C., Macaya, D., Quertermous, T., Trayanova, N. A., Quake, S. R., Ashley, E. A. 2016; 113 (41): 11555-11560

  Abstract

  Somatic mosaicism, the occurrence and propagation of genetic variation in cell lineages after fertilization, is increasingly recognized to play a causal role in a variety of human diseases. We investigated the case of life-threatening arrhythmia in a 10-day-old infant with long QT syndrome (LQTS). Rapid genome sequencing suggested a variant in the sodium channel NaV1.5 encoded by SCN5A, NM_000335:c.5284G > T predicting p.(V1762L), but read depth was insufficient to be diagnostic. Exome sequencing of the trio confirmed read ratios inconsistent with Mendelian inheritance only in the proband. Genotyping of single circulating leukocytes demonstrated the mutation in the genomes of 8% of patient cells, and RNA sequencing of cardiac tissue from the infant confirmed the expression of the mutant allele at mosaic ratios. Heterologous expression of the mutant channel revealed significantly delayed sodium current with a dominant negative effect. To investigate the mechanism by which mosaicism might cause arrhythmia, we built a finite element simulation model incorporating Purkinje fiber activation. This model confirmed the pathogenic consequences of cardiac cellular mosaicism and, under the presenting conditions of this case, recapitulated 2:1 AV block and arrhythmia. To investigate the extent to which mosaicism might explain undiagnosed arrhythmia, we studied 7,500 affected probands undergoing commercial gene-panel testing. Four individuals with pathogenic variants arising from early somatic mutation events were found. Here we establish cardiac mosaicism as a causal mechanism for LQTS and present methods by which the general phenomenon, likely to be relevant for all genetic diseases, can be detected through single-cell analysis and next-generation sequencing.

  View details for DOI 10.1073/pnas.1607187113

  View details for PubMedID 27681629

• Towards precision medicine. Nature reviews. Genetics Ashley, E. A. 2016; 17 (9): 507-522

  Abstract

  There is great potential for genome sequencing to enhance patient care through improved diagnostic sensitivity and more precise therapeutic targeting. To maximize this potential, genomics strategies that have been developed for genetic discovery - including DNA-sequencing technologies and analysis algorithms - need to be adapted to fit clinical needs. This will require the optimization of alignment algorithms, attention to quality-coverage metrics, tailored solutions for paralogous or low-complexity areas of the genome, and the adoption of consensus standards for variant calling and interpretation. Global sharing of this more accurate genotypic and phenotypic data will accelerate the determination of causality for novel genes or variants. Thus, a deeper understanding of disease will be realized that will allow its targeting with much greater therapeutic precision.

  View details for DOI 10.1038/nrg.2016.86

  View details for PubMedID 27528417

• Multidimensional structure-function relationships in human beta-cardiac myosin from population-scale genetic variation PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Homburger, J. R., Green, E. M., Caleshu, C., Sunitha, M. S., Taylor, R. E., Ruppel, K. M., Metpally, R. P., Colan, S. D., Michels, M., Day, S. M., Olivotto, I., Bustamante, C. D., Dewey, F. E., Ho, C. Y., Spudich, J. A., Ashley, E. A. 2016; 113 (24): 6701-6706

  Abstract

  Myosin motors are the fundamental force-generating elements of muscle contraction. Variation in the human ?-cardiac myosin heavy chain gene (MYH7) can lead to hypertrophic cardiomyopathy (HCM), a heritable disease characterized by cardiac hypertrophy, heart failure, and sudden cardiac death. How specific myosin variants alter motor function or clinical expression of disease remains incompletely understood. Here, we combine structural models of myosin from multiple stages of its chemomechanical cycle, exome sequencing data from two population cohorts of 60,706 and 42,930 individuals, and genetic and phenotypic data from 2,913 patients with HCM to identify regions of disease enrichment within ?-cardiac myosin. We first developed computational models of the human ?-cardiac myosin protein before and after the myosin power stroke. Then, using a spatial scan statistic modified to analyze genetic variation in protein 3D space, we found significant enrichment of disease-associated variants in the converter, a kinetic domain that transduces force from the catalytic domain to the lever arm to accomplish the power stroke. Focusing our analysis on surface-exposed residues, we identified a larger region significantly enriched for disease-associated variants that contains both the converter domain and residues on a single flat surface on the myosin head described as the myosin mesa. Notably, patients with HCM with variants in the enriched regions have earlier disease onset than patients who have HCM with variants elsewhere. Our study provides a model for integrating protein structure, large-scale genetic sequencing, and detailed phenotypic data to reveal insight into time-shifted protein structures and genetic disease.

  View details for DOI 10.1073/pnas.1606950113

  View details for Web of Science ID 000377948800046

  View details for PubMedID 27247418

  View details for PubMedCentralID PMC4914177

• The Undiagnosed Diseases Network of the National Institutes of Health A National Extension JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION Gahl, W. A., Wise, A. L., Ashley, E. A. 2015; 314 (17): 1797-1798

  View details for DOI 10.1001/jama.2015.12249

  View details for Web of Science ID 000363960200008

  View details for PubMedID 26375289

• The precision medicine initiative: a new national effort. JAMA Ashley, E. A. 2015; 313 (21): 2119?20

  View details for PubMedID 25928209

• A long noncoding RNA protects the heart from pathological hypertrophy NATURE Han, P., Li, W., Lin, C., Yang, J., Shang, C., Nurnberg, S. T., Jin, K. K., Xu, W., Lin, C., Lin, C., Xiong, Y., Chien, H., Zhou, B., Ashley, E., Bernstein, D., Chen, P., Chen, H. V., Quertermous, T., Chang, C. 2014; 514 (7520): 102-?

  Abstract

  The role of long noncoding RNA (lncRNA) in adult hearts is unknown; also unclear is how lncRNA modulates nucleosome remodelling. An estimated 70% of mouse genes undergo antisense transcription, including myosin heavy chain 7 (Myh7), which encodes molecular motor proteins for heart contraction. Here we identify a cluster of lncRNA transcripts from Myh7 loci and demonstrate a new lncRNA-chromatin mechanism for heart failure. In mice, these transcripts, which we named myosin heavy-chain-associated RNA transcripts (Myheart, or Mhrt), are cardiac-specific and abundant in adult hearts. Pathological stress activates the Brg1-Hdac-Parp chromatin repressor complex to inhibit Mhrt transcription in the heart. Such stress-induced Mhrt repression is essential for cardiomyopathy to develop: restoring Mhrt to the pre-stress level protects the heart from hypertrophy and failure. Mhrt antagonizes the function of Brg1, a chromatin-remodelling factor that is activated by stress to trigger aberrant gene expression and cardiac myopathy. Mhrt prevents Brg1 from recognizing its genomic DNA targets, thus inhibiting chromatin targeting and gene regulation by Brg1. It does so by binding to the helicase domain of Brg1, a domain that is crucial for tethering Brg1 to chromatinized DNA targets. Brg1 helicase has dual nucleic-acid-binding specificities: it is capable of binding lncRNA (Mhrt) and chromatinized--but not naked--DNA. This dual-binding feature of helicase enables a competitive inhibition mechanism by which Mhrt sequesters Brg1 from its genomic DNA targets to prevent chromatin remodelling. A Mhrt-Brg1 feedback circuit is thus crucial for heart function. Human MHRT also originates from MYH7 loci and is repressed in various types of myopathic hearts, suggesting a conserved lncRNA mechanism in human cardiomyopathy. Our studies identify a cardioprotective lncRNA, define a new targeting mechanism for ATP-dependent chromatin-remodelling factors, and establish a new paradigm for lncRNA-chromatin interaction.

  View details for DOI 10.1038/nature13596

  View details for Web of Science ID 000342420800044

  View details for PubMedCentralID PMC4184960

• Molecular diagnosis of long QT syndrome at 10 days of life by rapid whole genome sequencing. Heart rhythm Priest, J. R., Ceresnak, S. R., Dewey, F. E., Malloy-Walton, L. E., Dunn, K., Grove, M. E., Perez, M. V., Maeda, K., Dubin, A. M., Ashley, E. A. 2014; 11 (10): 1707-1713

  Abstract

  The advent of clinical next generation sequencing is rapidly changing the landscape of rare disease medicine. Molecular diagnosis of long QT syndrome (LQTS) can impact clinical management, including risk stratification and selection of pharmacotherapy based on the type of ion channel affected, but results from current gene panel testing requires 4 to 16 weeks before return to clinicians.A term female infant presented with 2:1 atrioventricular block and ventricular arrhythmias consistent with perinatal LQTS, requiring aggressive treatment including epicardial pacemaker, and cardioverter-defibrillator implantation and sympathectomy on day of life two. We sought to provide a rapid molecular diagnosis for optimization of treatment strategies.We performed CLIA-certified rapid whole genome sequencing (WGS) with a speed-optimized bioinformatics platform to achieve molecular diagnosis at 10 days of life.We detected a known pathogenic variant in KCNH2 that was demonstrated to be paternally inherited by followup genotyping. The unbiased assessment of the entire catalog of human genes provided by whole genome sequencing revealed a maternally inherited variant of unknown significance in a novel gene.Rapid clinical WGS provides faster and more comprehensive diagnostic information by 10 days of life than standard gene-panel testing. In selected clinical scenarios such as perinatal LQTS, rapid WGS may be able to provide more timely and clinically actionable information than a standard commercial test.

  View details for DOI 10.1016/j.hrthm.2014.06.030

  View details for PubMedID 24973560

• Guidelines for investigating causality of sequence variants in human disease NATURE MacArthur, D. G., Manolio, T. A., Dimmock, D. P., Rehm, H. L., Shendure, J., Abecasis, G. R., Adams, D. R., Altman, R. B., Antonarakis, S. E., Ashley, E. A., Barrett, J. C., Biesecker, L. G., Conrad, D. F., Cooper, G. M., Cox, N. J., Daly, M. J., Gerstein, M. B., Goldstein, D. B., Hirschhorn, J. N., Leal, S. M., Pennacchio, L. A., Stamatoyannopoulos, J. A., Sunyaev, S. R., Valle, D., Voight, B. F., Winckler, W., Gunter, C. 2014; 508 (7497): 469-476

  Abstract

  The discovery of rare genetic variants is accelerating, and clear guidelines for distinguishing disease-causing sequence variants from the many potentially functional variants present in any human genome are urgently needed. Without rigorous standards we risk an acceleration of false-positive reports of causality, which would impede the translation of genomic research findings into the clinical diagnostic setting and hinder biological understanding of disease. Here we discuss the key challenges of assessing sequence variants in human disease, integrating both gene-level and variant-level support for causality. We propose guidelines for summarizing confidence in variant pathogenicity and highlight several areas that require further resource development.

  View details for DOI 10.1038/nature13127

  View details for Web of Science ID 000334741600026

  View details for PubMedID 24759409

• Clinical interpretation and implications of whole-genome sequencing. JAMA Dewey, F. E., Grove, M. E., Pan, C., Goldstein, B. A., Bernstein, J. A., Chaib, H., Merker, J. D., Goldfeder, R. L., Enns, G. M., David, S. P., Pakdaman, N., Ormond, K. E., Caleshu, C., Kingham, K., Klein, T. E., Whirl-Carrillo, M., Sakamoto, K., Wheeler, M. T., Butte, A. J., Ford, J. M., Boxer, L., Ioannidis, J. P., Yeung, A. C., Altman, R. B., Assimes, T. L., Snyder, M., Ashley, E. A., Quertermous, T. 2014; 311 (10): 1035-1045

  Abstract

  Whole-genome sequencing (WGS) is increasingly applied in clinical medicine and is expected to uncover clinically significant findings regardless of sequencing indication.To examine coverage and concordance of clinically relevant genetic variation provided by WGS technologies; to quantitate inherited disease risk and pharmacogenomic findings in WGS data and resources required for their discovery and interpretation; and to evaluate clinical action prompted by WGS findings.An exploratory study of 12 adult participants recruited at Stanford University Medical Center who underwent WGS between November 2011 and March 2012. A multidisciplinary team reviewed all potentially reportable genetic findings. Five physicians proposed initial clinical follow-up based on the genetic findings.Genome coverage and sequencing platform concordance in different categories of genetic disease risk, person-hours spent curating candidate disease-risk variants, interpretation agreement between trained curators and disease genetics databases, burden of inherited disease risk and pharmacogenomic findings, and burden and interrater agreement of proposed clinical follow-up.Depending on sequencing platform, 10% to 19% of inherited disease genes were not covered to accepted standards for single nucleotide variant discovery. Genotype concordance was high for previously described single nucleotide genetic variants (99%-100%) but low for small insertion/deletion variants (53%-59%). Curation of 90 to 127 genetic variants in each participant required a median of 54 minutes (range, 5-223 minutes) per genetic variant, resulted in moderate classification agreement between professionals (Gross ?, 0.52; 95% CI, 0.40-0.64), and reclassified 69% of genetic variants cataloged as disease causing in mutation databases to variants of uncertain or lesser significance. Two to 6 personal disease-risk findings were discovered in each participant, including 1 frameshift deletion in the BRCA1 gene implicated in hereditary breast and ovarian cancer. Physician review of sequencing findings prompted consideration of a median of 1 to 3 initial diagnostic tests and referrals per participant, with fair interrater agreement about the suitability of WGS findings for clinical follow-up (Fleiss ?, 0.24; P?

  View details for DOI 10.1001/jama.2014.1717

  View details for PubMedID 24618965

• Clinical assessment incorporating a personal genome LANCET Ashley, E. A., Butte, A. J., Wheeler, M. T., Chen, R., Klein, T. E., Dewey, F. E., Dudley, J. T., Ormond, K. E., Pavlovic, A., Morgan, A. A., Pushkarev, D., Neff, N. F., Hudgins, L., Gong, L., Hodges, L. M., Berlin, D. S., Thorn, C. F., Sangkuhl, K., Hebert, J. M., Woon, M., Sagreiya, H., Whaley, R., Knowles, J. W., Chou, M. F., Thakuria, J. V., Rosenbaum, A. M., Zaranek, A. W., Church, G. M., Greely, H. T., Quake, S. R., Altman, R. B. 2010; 375 (9725): 1525-1535

  Abstract

  The cost of genomic information has fallen steeply, but the clinical translation of genetic risk estimates remains unclear. We aimed to undertake an integrated analysis of a complete human genome in a clinical context.We assessed a patient with a family history of vascular disease and early sudden death. Clinical assessment included analysis of this patient's full genome sequence, risk prediction for coronary artery disease, screening for causes of sudden cardiac death, and genetic counselling. Genetic analysis included the development of novel methods for the integration of whole genome and clinical risk. Disease and risk analysis focused on prediction of genetic risk of variants associated with mendelian disease, recognised drug responses, and pathogenicity for novel variants. We queried disease-specific mutation databases and pharmacogenomics databases to identify genes and mutations with known associations with disease and drug response. We estimated post-test probabilities of disease by applying likelihood ratios derived from integration of multiple common variants to age-appropriate and sex-appropriate pre-test probabilities. We also accounted for gene-environment interactions and conditionally dependent risks.Analysis of 2.6 million single nucleotide polymorphisms and 752 copy number variations showed increased genetic risk for myocardial infarction, type 2 diabetes, and some cancers. We discovered rare variants in three genes that are clinically associated with sudden cardiac death-TMEM43, DSP, and MYBPC3. A variant in LPA was consistent with a family history of coronary artery disease. The patient had a heterozygous null mutation in CYP2C19 suggesting probable clopidogrel resistance, several variants associated with a positive response to lipid-lowering therapy, and variants in CYP4F2 and VKORC1 that suggest he might have a low initial dosing requirement for warfarin. Many variants of uncertain importance were reported.Although challenges remain, our results suggest that whole-genome sequencing can yield useful and clinically relevant information for individual patients.National Institute of General Medical Sciences; National Heart, Lung And Blood Institute; National Human Genome Research Institute; Howard Hughes Medical Institute; National Library of Medicine, Lucile Packard Foundation for Children's Health; Hewlett Packard Foundation; Breetwor Family Foundation.

  View details for Web of Science ID 000277655100025

  View details for PubMedID 20435227

• Yield of whole exome sequencing in undiagnosed patients facing insurance coverage barriers to genetic testing. Journal of genetic counseling Reuter, C. M., Kohler, J. N., Bonner, D., Zastrow, D., Fernandez, L., Dries, A., Marwaha, S., Davidson, J., Brokamp, E., Herzog, M., Hong, J., Macnamara, E., Rosenfeld, J. A., Schoch, K., Spillmann, R., Undiagnosed Diseases Network, Loscalzo, J., Krier, J., Stoler, J., Sweetser, D., Palmer, C. G., Phillips, J. A., Shashi, V., Adams, D. A., Yang, Y., Ashley, E. A., Fisher, P. G., Mulvihill, J. J., Bernstein, J. A., Wheeler, M. T. 2019

  Abstract

  BACKGROUND: Despite growing evidence of diagnostic yield and clinical utility of whole exome sequencing (WES) in patients with undiagnosed diseases, there remain significant cost and reimbursement barriers limiting access to such testing. The diagnostic yield and resulting clinical actions of WES for patients who previously faced insurance coverage barriers have not yet been explored.METHODS: We performed a retrospective descriptive analysis of clinical WES outcomes for patients facing insurance coverage barriers prior to clinical WES and who subsequently enrolled in the Undiagnosed Diseases Network (UDN). Clinical WES was completed as a result of participation in the UDN. Payer type, molecular diagnostic yield, and resulting clinical actions were evaluated.RESULTS: Sixty-six patients in the UDN faced insurance coverage barriers to WES at the time of enrollment (67% public payer, 26% private payer). Forty-two of 66 (64%) received insurance denial for clinician-ordered WES, 19/66 (29%) had health insurance through a payer known not to cover WES, and 5/66 (8%) had previous payer denial of other genetic tests. Clinical WES results yielded a molecular diagnosis in 23 of 66 patients (35% [78% pediatric, 65% neurologic indication]). Molecular diagnosis resulted in clinical actions in 14 of 23 patients (61%).CONCLUSIONS: These data demonstrate that a substantial proportion of patients who encountered insurance coverage barriers to WES had a clinically actionable molecular diagnosis, supporting the notion that WES has value as a covered benefit for patients who remain undiagnosed despite objective clinical findings.

  View details for DOI 10.1002/jgc4.1161

  View details for PubMedID 31478310

• Extracutaneous manifestations in phacomatosis cesioflammea and cesiomarmorata: Case series and literature review AMERICAN JOURNAL OF MEDICAL GENETICS PART A Kumar, A., Zastrow, D. B., Kravets, E. J., Beleford, D., Ruzhnikov, M. Z., Grove, M. E., Dries, A. M., Kohler, J. N., Waggott, D. M., Yang, Y., Huang, Y., Mackenzie, K. M., Eng, C. M., Fisher, P. G., Ashley, E. A., Teng, J. M., Stevenson, D. A., Shieh, J. T., Wheeler, M. T., Bernstein, J. A., Adams, D. R., Aday, A., Alejandro, M. E., Allard, P., Azamian, M. S., Bacino, C. A., Baker, E., Balasubramanyam, A., Barseghyan, H., Batzli, G. F., Beggs, A. H., Behnam, B., Bellen, H. J., Bican, A., Bick, D. P., Birch, C. L., Bonner, D., Boone, B. E., Bostwick, B. L., Briere, L. C., Brokamp, E., Brown, D. M., Brush, M., Burke, E. A., Burrage, L. C., Butte, M. J., Chen, S., Clark, G. D., Coakley, T. R., Cogan, J. D., Colley, H. A., Cooper, C. M., Cope, H., Craigen, W. J., D'Souza, P., Davids, M., Davidson, J. M., Dayal, J. G., Dell'Angelica, E. C., Dhar, S. U., Dipple, K. M., Donnell-Fink, L. A., Dorrani, N., Dorset, D. C., Douine, E. D., Draper, D. D., Eckstein, D. J., Emrick, L. T., Enns, G. M., Eskin, A., Esteves, C., Estwick, T., Fairbrother, L., Fernandez, L., Ferreira, C., Fieg, E. L., Fogel, B. L., Friedman, N. D., Gahl, W. A., Glanton, E., Godfrey, R. A., Goldman, A. M., Goldstein, D. B., Gould, S. E., Gourdine, J. F., Groden, C. A., Gropman, A. L., Haendel, M., Hamid, R., Hanchard, N. A., High, F., Holm, I. A., Hom, J., Howerton, E. M., Jamal, F., Jiang, Y., Johnston, J. M., Jones, A. L., Karaviti, L., Koeller, D. M., Kohane, I. S., Krasnewich, D. M., Korrick, S., Koziura, M., Krier, J. B., Kyle, J. E., Lalani, S. R., Lau, C., Lazar, J., LeBlanc, K., Lee, B. H., Lee, H., Levy, S. E., Lewis, R. A., Lincoln, S. A., Loo, S. K., Loscalzo, J., Maas, R. L., Macnamara, E. F., MacRae, C. A., Maduro, V. V., Majcherska, M. M., Malicdan, M., Mamounas, L. A., Manolio, T. A., Markello, T. C., Marom, R., Martin, M. G., Martinez-Agosto, J. A., Marwaha, S., May, T., McConkie-Rosell, A., McCormack, C. E., McCray, A. T., Merker, J. D., Metz, T. O., Might, M., Moretti, P. M., Morimoto, M., Mulvihill, J. J., Murdock, D. R., Murphy, J. L., Muzny, D. M., Nehrebecky, M. E., Nelson, S. F., Newberry, J., Newman, J. H., Nicholas, S. K., Novacic, D., Orange, J. S., Orengo, J. P., Pallais, J., Palmer, C. S., Papp, J. C., Parker, N. H., Pena, L. M., Phillips, J. A., Posey, J. E., Postlethwait, J. H., Potocki, L., Pusey, B. N., Reuter, C. M., Rives, L., Robertson, A. K., Rodan, L. H., Rosenfeld, J. A., Sampson, J. B., Samson, S. L., Schoch, K., Scott, D. A., Shakachite, L., Sharma, P., Shashi, V., Signer, R., Silverman, E. K., Sinsheimer, J. S., Smith, K. S., Spillmann, R. C., Staler, J. M., Stong, N., Sullivan, J. A., Sweetser, D. A., Tan, Q., Tifft, C. J., Toro, C., Tran, A. A., Urv, T. K., Vilain, E., Vogel, T. P., Wahl, C. E., Walley, N. M., Walsh, C. A., Walker, M., Wan, J., Wangler, M. F., Ward, P. A., Waters, K. M., Webb-Robertson, B. M., Westerfield, M., Wise, A. L., Wolfe, L. A., Worthey, E. A., Yamamoto, S., Yang, J., Yoon, A. J., Yu, G., Zhao, C., Zheng, A., Undiagnosed Dis Network 2019; 179 (6): 966?77

  View details for DOI 10.1002/ajmg.a.61134

  View details for Web of Science ID 000468322800015

• Comparison of QT Interval Measurement Methods and Correction Formulas in Atrial Fibrillation AMERICAN JOURNAL OF CARDIOLOGY Tooley, J., Ouyang, D., Hadley, D., Turakhia, M., Wang, P., Ashley, E., Froelicher, V., Perez, M. 2019; 123 (11): 1822?27

  View details for DOI 10.1016/j.amjcard.2019.02.057

  View details for Web of Science ID 000470339900014

• A Patient with Sjogren's Syndrome and Subsequent Diagnosis of Inclusion Body Myositis and Light-Chain Amyloidosis JOURNAL OF GENERAL INTERNAL MEDICINE Hom, J., Marwaha, S., Postolova, A., Kittle, J., Vasquez, R., Davidson, J., Kohler, J., Dries, A., Fernandez-Betancourt, L., Majcherska, M., Dearlove, J., Raghavan, S., Vogel, H., Bernstein, J. A., Fisher, P., Ashley, E., Sampson, J., Wheeler, M., Undiagnosed Dis Network 2019; 34 (6): 1058?62

  View details for DOI 10.1007/s11606-019-04931-w

  View details for Web of Science ID 000469884700059

• Blood pressure in athletic preparticipation evaluation and the implication for cardiac remodelling. Heart (British Cardiac Society) Hedman, K., Moneghetti, K. J., Christle, J. W., Bagherzadeh, S. P., Amsallem, M., Ashley, E., Froelicher, V., Haddad, F. 2019

  Abstract

  OBJECTIVES: To explore blood pressure (BP) in athletes at preparticipation evaluation (PPE) in the context of recently updated US and European hypertension guidelines, and to determine the relationship between BP and left ventricular (LV) remodelling.METHODS: In this retrospective study, athletes aged 13-35 years who underwent PPE facilitated by the Stanford Sports Cardiology programme were considered. Resting BP was measured in both arms; repeated once if ?140/90mm Hg. Athletes with abnormal ECGs or known hypertension were excluded. BP was categorised per US/European hypertension guidelines. In a separate cohort of athletes undergoing routine PPE echocardiography, we explored the relationship between BP and LV remodelling (LV mass, mass/volume ratio, sphericity index) and LV function.RESULTS: In cohort 1 (n=2733, 65.5% male), 34.3% of athletes exceeded US hypertension thresholds. Male sex (B=3.17, p<0.001), body mass index (BMI) (B=0.80, p<0.001) and height (B=0.25, p<0.001) were the strongest independent correlates of systolic BP. In the second cohort (n=304, ages 17-26), systolic BP was an independent correlate of LV mass/volume ratio (B=0.002, p=0.001). LV longitudinal strain was similar across BP categories, while higher BP was associated with slower early diastolic relaxation.CONCLUSION: In a large contemporary cohort of athletes, one-third presented with BP levels above the current US guidelines' thresholds for hypertension, highlighting that lowering the BP thresholds at PPE warrants careful consideration as well as efforts to standardise measurements. Higher systolic BP was associated with male sex, BMI and height and with LV remodelling and diastolic function, suggesting elevated BP in athletes during PPE may signify a clinically relevant condition.

  View details for DOI 10.1136/heartjnl-2019-314815

  View details for PubMedID 31142598

• Athletic Remodeling in Female College Athletes: The "Morganroth Hypothesis" Revisited CLINICAL JOURNAL OF SPORT MEDICINE Kooreman, Z., Giraldeau, G., Finocchiaro, G., Kobayashi, Y., Wheeler, M., Perez, M., Moneghetti, K., Oxborough, D., George, K. P., Myers, J., Ashley, E., Haddad, F. 2019; 29 (3): 224?31

  View details for DOI 10.1097/JSM.0000000000000501

  View details for Web of Science ID 000480736100009

• Physical activity, sleep and cardiovascular health data for 50,000 individuals from the MyHeart Counts Study. Scientific data Hershman, S. G., Bot, B. M., Shcherbina, A., Doerr, M., Moayedi, Y., Pavlovic, A., Waggott, D., Cho, M. K., Rosenberger, M. E., Haskell, W. L., Myers, J., Champagne, M. A., Mignot, E., Salvi, D., Landray, M., Tarassenko, L., Harrington, R. A., Yeung, A. C., McConnell, M. V., Ashley, E. A. 2019; 6 (1): 24

  Abstract

  Studies have established the importance of physical activity and fitness for long-term cardiovascular health, yet limited data exist on the association between objective, real-world large-scale physical activity patterns, fitness, sleep, and cardiovascular health primarily due to difficulties in collecting such datasets. We present data from the MyHeart Counts Cardiovascular Health Study, wherein participants contributed data via an iPhone application built using Apple's ResearchKit framework and consented to make this data available freely for further research applications. In this smartphone-based study of cardiovascular health, participants recorded daily physical activity, completed health questionnaires, and performed a 6-minute walk fitness test. Data from English-speaking participants aged 18 years or older with a US-registered iPhone who agreed to share their data broadly and who enrolled between the study's launch and the time of the data freeze for this data release (March 10 2015-October 28 2015) are now available for further research. It is anticipated that releasing this large-scale collection of real-world physical activity, fitness, sleep, and cardiovascular health data will enable the research community to work collaboratively towards improving our understanding of the relationship between cardiovascular indicators, lifestyle, and overall health, as well as inform mobile health research best practices.

  View details for PubMedID 30975992

• Developing a genomics rotation: Practical training around variant interpretation for genetic counseling students JOURNAL OF GENETIC COUNSELING Grove, M. E., White, S., Fisk, D. G., Rego, S., Dagan-Rosenfeld, O., Kohler, J. N., Reuter, C. M., Bonner, D., Wheeler, M. T., Bernstein, J. A., Ormond, K. E., Hanson-Kahn, A. K., Undiagnosed Dis Network 2019; 28 (2): 466?76

  View details for DOI 10.1002/jgc4.1094

  View details for Web of Science ID 000463993600030

• PHACOMATOSIS PIGMENTOVASCULARIS AND EXTRACUTANEOUS MANIFESTATIONS: CASE SERIES, LITERATURE REVIEW AND CONSIDERATIONS FOR MANAGEMENT Kumar, A., Zastrow, D. B., Beleford, D., Ruzhnikov, M. Z., Grove, M. E., Dries, A. M., Kohler, J. N., Waggott, D. M., Yang, Y., Huang, Y., Mackenzie, K. M., Eng, C. M., Fisher, P. G., Ashley, E. A., Teng, J. M., Stevenson, D. A., Shieh, J. T., Wheeler, M. T., Bernstein, J. A., Undiagnosed Dis Network WILEY. 2019: 718?19

  View details for Web of Science ID 000462676800119

• A toolkit for genetics providers in follow-up of patients with non-diagnostic exome sequencing JOURNAL OF GENETIC COUNSELING Zastrow, D. B., Kohler, J. N., Bonner, D., Reuter, C. M., Fernandez, L., Grove, M. E., Fisk, D. G., Yang, Y., Eng, C. M., Ward, P. A., Bick, D., Worthey, E. A., Fisher, P. G., Ashley, E. A., Bernstein, J. A., Wheeler, M. T., Adams, D. R., Aday, A., Alejandro, M. E., Allard, P., Ashley, E. A., Azamian, M. S., Bacino, C. A., Baker, E., Balasubramanyam, A., Barseghyan, H., Batzli, G. F., Beggs, A. H., Behnam, B., Bellen, H. J., Bernstein, J. A., Bican, A., Bick, D. P., Birch, C. L., Boone, B. E., Bostwick, B. L., Briere, L. C., Brokamp, E., Brown, D. M., Brush, M., Burke, E. A., Burrage, L. C., Butte, M. J., Chen, S., Clark, G. D., Coakley, T. R., Cogan, J. D., Colley, H. A., Cooper, C. M., Cope, H., Craigen, W. J., D'Souza, P., Davids, M., Dayal, J. G., Dell'Angelica, E. C., Dhar, S. U., Dipple, K. M., Donnell-Fink, L. A., Dorrani, N., Dorset, D. C., Douine, E. D., Draper, D. D., Dries, A. M., Eckstein, D. J., Emrick, L. T., Eng, C. M., Enns, G. M., Eskin, A., Esteves, C., Estwick, T., Fairbrother, L., Ferreira, C., Fieg, E. L., Fisher, P. G., Fogel, B. L., Gahl, W. A., Glanton, E., Godfrey, R. A., Goldman, A. M., Goldstein, D. B., Gould, S. E., Gourdine, J. F., Groden, C. A., Gropman, A. L., Haendel, M., Hamid, R., Hanchard, N. A., High, F., Holm, I. A., Hom, J., Howerton, E. M., Huang, Y., Jamal, F., Jiang, Y., Johnston, J. M., Jones, A. L., Karaviti, L., Koeller, D. M., Kohane, I. S., Krasnewich, D. M., Korrick, S., Koziura, M., Krier, J. B., Kyle, J. E., Lalani, S. R., Lau, C., Lazar, J., LeBlanc, K., Lee, B. H., Lee, H., Levy, S. E., Lewis, R. A., Lincoln, S. A., Loo, S. K., Loscalzo, J., Maas, R. L., Macnamara, E. F., MacRae, C. A., Maduro, V. V., Majcherska, M. M., Malicdan, M. V., Mamounas, L. A., Manolio, T. A., Markello, T. C., Marom, R., Martin, G., Martinez-Agosto, J. A., Marwaha, S., May, T., McConkie-Rosell, A., McCormack, C. E., McCray, A. T., Merker, J. D., Metz, T. O., Might, M., Moretti, P. M., Morimoto, M., Nehrebecky, M. E., Nelson, S. F., Newberry, J., Newman, J. H., Nicholas, S. K., Novacic, D., Orange, J. S., Orengo, J. P., Pallais, J., Palmer, C. S., Papp, J. C., Postlethwait, J. H., Potocki, L., Pusey, B. N., Rives, L., Robertson, A. K., Rodan, L. H., Rosenfeld, J. A., Sampson, J. B., Samson, S. L., Schoch, K., Scott, D. A., Shakachite, L., Sharma, P., Shashi, V., Signer, R., Silverman, E. K., Sinsheimer, J. S., Smith, K. S., Spillmann, R. C., Stoler, J. M., Stong, N., Sullivan, J. A., Sweetser, D. A., Tan, Q., Tifft, C. J., Toro, C., Tran, A. A., Urv, T. K., Vilain, E., Vogel, T. P., Waggott, D. M., Wahl, C. E., Walley, N. M., Walsh, C. A., Walker, M., Wan, J., Wangler, M. F., Ward, P. A., Waters, K. M., Webb-Robertson, B. M., Westerfield, M., Wheeler, M. T., Wise, A. L., Wolfe, L. A., Worthey, E. A., Yamamoto, S., Yang, J., Yang, Y., Yoon, A. J., Yu, G., Zhao, C., Zheng, A., Undiagnosed Dis Network 2019; 28 (2): 213?28

  View details for DOI 10.1002/jgc4.1119

  View details for Web of Science ID 000463993600005

• Targeting ferroptosis: A novel therapeutic strategy for the treatment of mitochondrial disease-related epilepsy PLOS ONE Kahn-Kirby, A. H., Amagata, A., Maeder, C. I., Mei, J. J., Sideris, S., Kosaka, Y., Hinman, A., Malone, S. A., Bruegger, J. J., Wang, L., Kim, V., Shrader, W. D., Hoff, K. G., Latham, J. C., Ashley, E. A., Wheeler, M. T., Bertini, E., Carrozzo, R., Martinelli, D., Dionisi-Vici, C., Chapman, K. A., Enns, G. M., Gahl, W., Wolfe, L., Saneto, R. P., Johnson, S. C., Trimmer, J. K., Klein, M. B., Holst, C. R. 2019; 14 (3)

  View details for DOI 10.1371/journal.pone.0214250

  View details for Web of Science ID 000462594000047

• Extracutaneous manifestations in phacomatosis cesioflammea and cesiomarmorata: Case series and literature review. American journal of medical genetics. Part A Kumar, A., Zastrow, D. B., Kravets, E. J., Beleford, D., Ruzhnikov, M. R., Grove, M. E., Dries, A. M., Kohler, J. N., Waggott, D. M., Yang, Y., Huang, Y., Undiagnosed Diseases Network, Mackenzie, K. M., Eng, C. M., Fisher, P. G., Ashley, E. A., Teng, J. M., Stevenson, D. A., Shieh, J. T., Wheeler, M. T., Bernstein, J. A. 2019

  Abstract

  Phacomatosis pigmentovascularis (PPV) comprises a family of rare conditions that feature vascular abnormalities and melanocytic lesions that can be solely cutaneous or multisystem in nature. Recently published work has demonstrated that both vascular and melanocytic abnormalities in PPV of the cesioflammea and cesiomarmorata subtypes can result from identical somatic mosaic activating mutations in the genes GNAQ and GNA11. Here, we present three new cases of PPV with features of the cesioflammea and/or cesiomarmorata subtypes and mosaic mutations in GNAQ or GNA11. To better understand the risk of potentially occult complications faced by such patients we additionally reviewed 176 cases published in the literature. We report the frequency of clinical findings, their patterns of co-occurrence as well as published recommendations for surveillance after diagnosis. Features assessed include: capillary malformation; dermal and ocular melanocytosis; glaucoma; limb asymmetry; venous malformations; and central nervous system (CNS) anomalies, such as ventriculomegaly and calcifications. We found that ocular findings are common in patients with phacomatosis cesioflammea and cesiomarmorata. Facial vascular involvement correlates with a higher risk of seizures (p=.0066). Our genetic results confirm the role of mosaic somatic mutations in GNAQ and GNA11 in phacomatosis cesioflammea and cesiomarmorata. Their clinical and molecular findings place these conditions on a clinical spectrum encompassing other GNAQ and GNA11 related disorders and inform recommendations for their management.

  View details for PubMedID 30920161

• Response by Ho et al to Letter Regarding Article, "Genotype and Lifetime Burden of Disease in Hypertrophic Cardiomyopathy: Insights From the Sarcomeric Human Cardiomyopathy Registry (SHaRe)". Circulation Ho, C. Y., Day, S. M., Ashley, E. A., Michels, M., Pereira, A. C., Jacoby, D., Lakdawala, N. K., Ware, J. S., Helms, A. S., Colan, S. D., Seidman, C. E., Olivotto, I., SHaRe Investigators 2019; 139 (12): 1559?60

  View details for DOI 10.1161/CIRCULATIONAHA.118.039069

  View details for PubMedID 30883221

• Comparison of QT Interval Measurement Methods and Correction Formulas in Atrial Fibrillation. The American journal of cardiology Tooley, J., Ouyang, D., Hadley, D., Turakhia, M., Wang, P., Ashley, E., Froelicher, V., Perez, M. 2019

  Abstract

  Antiarrhythmic drugs used in atrial fibrillation (AF) cause QT prolongation and are associated with torsades de pointes, a deadly ventricular arrhythmia. No consensus exists on the optimal method of QT measurement or correction in AF. Therefore, we compared common methods to measure and correct QT in AF to identify the most accurate approach. We identified patients who had electrocardiograms done at Stanford Hospital (Stanford, California) between January 2014 and October 2016 with conversion from AF to sinus rhythm (SR) within a 24-hour period. QT intervals were determined using different measurement methods and corrected using the Bazett's, Framingham, Fridericia, or Hodges formulas for heart rate (HR). Comparisons were made between QT in a patient's last instance of AF to SR. Computerized measurements were taken from 715 patients. Manual measurements were taken from a 50-patient subset. Bazett's formula produced the longest corrected QT in AF compared with other formulas (p <0.005). Measuring QT as an average over multiple beats resulted in a smaller difference between AF and SR than choosing a single beat. Determining QT from a 5-beat average resulted in a QTc that was 19.0ms higher (interquartile range 0.30 to 43.7) in AF than SR. After correcting for residual effect of HR on QTc, there was not a significant difference between QTc in AF to SR. In conclusion, measuring QT over multiple beats produces a more accurate measurement of QT in AF. Differences between QTc in AF and SR exist because of imperfect HR correction formula and not due to an independent effect of AF.

  View details for PubMedID 30961909

• COMPARISON OF UNITED STATES AND EUROPEAN CRITERIA FOR HYPERTENSION IN A LARGE COHORT OF COMPETITIVE ATHLETES EXAMINED AS PART OF PRE-PARTICIPATION EVALUATION Hedman, K., Moneghetti, K., Christle, J. W., Bagherzadeh, S. P., Haddad, F., Ashley, E. A., Froelicher, V. ELSEVIER SCIENCE INC. 2019: 446

  View details for Web of Science ID 000460565900446

• INDEPENDENT PROGNOSTIC VALUES OF CLINICAL RISK SCORES, RIGHT VENTRICULAR SYSTOLIC PRESSURE, AND N-TERMINAL PRO-B-TYPE PEPTIDE IN HEART FAILURE WITH PRESERVED EJECTION FRACTION: INSIGHTS FROM SUPERVISED AND UNSUPERVISED MODELS Tremblay-Gravel, M., Kobayashi, Y., Boralkar, K., Li, X., Bouajila, S., Nishi, T., Amsallem, M., Moneghetti, K., Selej, M., Ozen, M., Demirci, U., Ashley, E. A., Wheeler, M., Knowlton, K., Kouznetsova, T., Haddad, F. ELSEVIER SCIENCE INC. 2019: 718

  View details for Web of Science ID 000460565900718

• NOVEL ALPHA-ACTININ 2 MUTATIONS ARE ASSOCIATED WITH CARDIOMYOPATHY AND HYPERTROPHY IN HUMAN CARDIAC TISSUE AND IPSC-DERIVED CARDIOMYOCYTES Lindholm, M., Zhu, H., Huang, Y., Ashley, E. A., Wheeler, M. ELSEVIER SCIENCE INC. 2019: 1027

  View details for Web of Science ID 000460565901040

• RESTING BLOOD PRESSURE IN 2881 ATHLETES AGED 9-35 YEARS OF AGE AND THE RELATION TO SEX, AGE, BODY SIZE, AND AFRO-AMERICAN DESCENT Bagherzadeh, S. P., Hedman, K., Christle, J. W., Moneghetti, K., Ashley, E. A., Haddad, F., Froelicher, V. ELSEVIER SCIENCE INC. 2019: 447

  View details for Web of Science ID 000460565900447

• Rapid Genome Sequencing in the Critically lll. Clinical chemistry Buchan, J. G., White, S., Joshi, R., Ashley, E. A. 2019

  View details for PubMedID 30842082

• Loss of function, missense, and intronic variants in NOTCH1 confer different risks for left ventricular outflow tract obstructive heart defects in two European cohorts GENETIC EPIDEMIOLOGY Helle, E., Cordova-Palomera, A., Ojala, T., Saha, P., Potiny, P., Gustafsson, S., Ingelsson, E., Bamshad, M., Nickerson, D., Chong, J. X., Ashley, E., Priest, J. R., Univ Washington Ctr Mendelia 2019; 43 (2): 215?26

  View details for DOI 10.1002/gepi.22176

  View details for Web of Science ID 000462061900008

• Time based versus strain based myocardial performance indices in hypertrophic cardiomyopathy, the merging role of left atrial strain EUROPEAN HEART JOURNAL-CARDIOVASCULAR IMAGING Kobayashi, Y., Moneghetti, K. J., Bouajila, S., Stolfo, D., Finocchiaro, G., Kuznetsova, T., Liang, D., Schnittger, I., Ashley, E., Wheeler, M., Haddad, F. 2019; 20 (3): 334?42

  View details for DOI 10.1093/ehjci/jey097

  View details for Web of Science ID 000481422400015

• Regional Variation in RBM20 Causes a Highly Penetrant Arrhythmogenic Cardiomyopathy. Circulation. Heart failure Parikh, V. N., Caleshu, C., Reuter, C., Lazzeroni, L. C., Ingles, J., Garcia, J., McCaleb, K., Adesiyun, T., Sedaghat-Hamedani, F., Kumar, S., Graw, S., Gigli, M., Stolfo, D., Dal Ferro, M., Ing, A. Y., Nussbaum, R., Funke, B., Wheeler, M. T., Hershberger, R. E., Cook, S., Steinmetz, L. M., Lakdawala, N. K., Taylor, M. R., Mestroni, L., Merlo, M., Sinagra, G., Semsarian, C., Meder, B., Judge, D. P., Ashley, E. 2019; 12 (3): e005371

  Abstract

  Background Variants in the cardiomyocyte-specific RNA splicing factor RBM20 have been linked to familial cardiomyopathy, but the causative genetic architecture and clinical consequences of this disease are incompletely defined. Methods and Results To define the genetic architecture of RBM20 cardiomyopathy, we first established a database of RBM20 variants associated with cardiomyopathy and compared these to variants observed in the general population with respect to their location in the RBM20 coding transcript. We identified 2 regions significantly enriched for cardiomyopathy-associated variants in exons 9 and 11. We then assembled a registry of 74 patients with RBM20 variants from 8 institutions across the world (44 index cases and 30 from cascade testing). This RBM20 patient registry revealed highly prevalent family history of sudden cardiac death (51%) and cardiomyopathy (72%) among index cases and a high prevalence of composite arrhythmias (including atrial fibrillation, nonsustained ventricular tachycardia, implantable cardiac defibrillator discharge, and sudden cardiac arrest, 43%). Patients harboring variants in cardiomyopathy-enriched regions identified by our variant database analysis were enriched for these findings. Further, these characteristics were more prevalent in the RBM20 registry than in large cohorts of patients with dilated cardiomyopathy and TTNtv cardiomyopathy and not significantly different from a cohort of patients with LMNA-associated cardiomyopathy. Conclusions Our data establish RBM20 cardiomyopathy as a highly penetrant and arrhythmogenic cardiomyopathy. These findings underline the importance of arrhythmia surveillance and family screening in this disease and represent the first step in defining the genetic architecture of RBM20 disease causality on a population level.

  View details for PubMedID 30871351

• Regional Variation in RBM20 Causes a Highly Penetrant Arrhythmogenic Cardiomyopathy CIRCULATION-HEART FAILURE Parikh, V. N., Caleshu, C., Reuter, C., Lazzeroni, L. C., Ingles, J., Garcia, J., McCaleb, K., Adesiyun, T., Sedaghat-Hamedani, F., Kumar, S., Graw, S., Gigli, M., Stolfo, D., Dal Ferro, M., Ing, A. Y., Nussbaum, R., Funke, B., Wheeler, M. T., Hershberger, R. E., Cook, S., Steinmetz, L. M., Lakdawala, N. K., Taylor, M. G., Mestroni, L., Merlo, M., Sinagra, G., Semsarian, C., Meder, B., Judge, D. P., Ashley, E. 2019; 12 (3)

  View details for DOI 10.1161/CIRCHEARTFAILURE.118.005371

  View details for Web of Science ID 000469339500003

• Quantitative approaches to variant classification increase the yield and precision of genetic testing in Mendelian diseases: the case of hypertrophic cardiomyopathy. Genome medicine Walsh, R., Mazzarotto, F., Whiffin, N., Buchan, R., Midwinter, W., Wilk, A., Li, N., Felkin, L., Ingold, N., Govind, R., Ahmad, M., Mazaika, E., Allouba, M., Zhang, X., de Marvao, A., Day, S. M., Ashley, E., Colan, S. D., Michels, M., Pereira, A. C., Jacoby, D., Ho, C. Y., Thomson, K. L., Watkins, H., Barton, P. J., Olivotto, I., Cook, S. A., Ware, J. S. 2019; 11 (1): 5

  Abstract

  BACKGROUND: International guidelines for variant interpretation in Mendelian disease set stringent criteria to report a variant as (likely) pathogenic, prioritising control of false-positive rate over test sensitivity and diagnostic yield. Genetic testing is also more likely informative in individuals with well-characterised variants from extensively studied European-ancestry populations. Inherited cardiomyopathies are relatively common Mendelian diseases that allow empirical calibration and assessment of this framework.METHODS: We compared rare variants in large hypertrophic cardiomyopathy (HCM) cohorts (up to 6179 cases) to reference populations to identify variant classes with high prior likelihoods of pathogenicity, as defined by etiological fraction (EF). We analysed the distribution of variants using a bespoke unsupervised clustering algorithm to identify gene regions in which variants are significantly clustered in cases.RESULTS: Analysis of variant distribution identified regions in which variants are significantly enriched in cases and variant location was a better discriminator of pathogenicity than generic computational functional prediction algorithms. Non-truncating variant classes with an EF ?0.95 were identified in five established HCM genes. Applying this approach leads to an estimated 14-20% increase in cases with actionable HCM variants, i.e. variants classified as pathogenic/likely pathogenic that might be used for predictive testing in probands' relatives.CONCLUSIONS: When found in a patient confirmed to have disease, novel variants in some genes and regions are empirically shown to have a sufficiently high probability of pathogenicity to support a "likely pathogenic" classification, even without additional segregation or functional data. This could increase the yield of high confidence actionable variants, consistent with the framework and recommendations of current guidelines. The techniques outlined offer a consistent and unbiased approach to variant interpretation for Mendelian disease genetic testing. We propose adaptations to ACMG/AMP guidelines to incorporate such evidence in a quantitative and transparent manner.

  View details for PubMedID 30696458

• Approaching Higher Dimension Imaging Data Using Cluster-Based Hierarchical Modeling in Patients with Heart Failure Preserved Ejection Fraction. Scientific reports Kobayashi, Y., Tremblay-Gravel, M., Boralkar, K. A., Li, X., Nishi, T., Amsallem, M., Moneghetti, K. J., Bouajila, S., Selej, M., Ozen, M. O., Demirci, U., Ashley, E., Wheeler, M., Knowlton, K. U., Kouznetsova, T., Haddad, F. 2019; 9 (1): 10431

  Abstract

  Heart failure with preserved ejection fraction (HFpEF) is a major cause of morbidity and mortality, accounting for the majority of heart failure (HF) hospitalization. To identify the most complementary predictors of mortality among clinical, laboratory and echocardiographic data, we used cluster based hierarchical modeling. Using Stanford Translational Research Database, we identified patients hospitalized with HFpEF between 2005 and 2016 in whom echocardiogram and NT-proBNP were both available at the time of admission. Comprehensive echocardiographic assessment including left ventricular longitudinal strain (LVLS), right ventricular function and right ventricular systolic pressure (RVSP) was performed. The outcome was defined as all-cause mortality. Among patients identified, 186 patients with complete echocardiographic assessment were included in the analysis. The cohort included 58% female, with a mean age of 78.7?±?13.5 years, LVLS of -13.3?±?2.5%, an estimated RVSP of 38?±?13?mmHg. Unsupervised cluster analyses identified six clusters including ventricular systolic-function cluster, diastolic-hemodynamic cluster, end-organ function cluster, vital-sign cluster, complete blood count and sodium clusters. Using a stepwise hierarchical selection from each cluster, we identified NT-proBNP (standard hazard ratio [95%CI]?=?1.56 [1.17-2.08]) and RVSP (1.37 [1.09-1.78]) as independent correlates of outcome. When adding these parameters to the well validated Get with the Guideline Heart Failure risk score, the Chi-square was significantly improved (p?=?0.01). In conclusion, NT-proBNP and RVSP were independently predictive in HFpEF among clinical, imaging, and biomarker parameters. Cluster-based hierarchical modeling may help identify the complementally predictive parameters in small cohorts with higher dimensional clinical data.

  View details for DOI 10.1038/s41598-019-46873-7

  View details for PubMedID 31320698

• Cardiopulmonary Exercise Testing, Impedance Cardiography and Reclassification of Risk in Patients Referred for Heart Failure Evaluation. Journal of cardiac failure Myers, J., Christle, J. W., Tun, A., Yilmaz, B., Moneghetti, K. J., Yuen, E., Soofi, M., Ashley, E. 2019

  Abstract

  An impaired cardiac output response to exercise is a hallmark of chronic heart failure (HF). We determined the extent to which impedance cardiography (ICG) during exercise in combination with cardiopulmonary exercise test (CPX) responses reclassified risk for adverse events in patients with HF.CPX and ICG were performed in 1,236 consecutive patients (48±15 years) evaluated for HF. Clinical, ICG and CPX variables were acquired at baseline and subjects were followed for the composite outcome of cardiac-related death, hospitalization for worsening HF, cardiac transplantation, and left ventricular assist device (LVAD) implantation. Cox proportional hazards analyses including clinical, non-invasive hemodynamic, and CPX variables were performed to determine their association with the composite endpoint. Net reclassification improvement (NRI) was calculated to quantify the impact of adding hemodynamic responses to a model including established CPX risk markers on reclassifying risk. There were 422 events. Among CPX variables, peak VO2 and indices of ventilatory inefficiency (VE/VCO2 slope, oxygen uptake efficiency slope) were significant predictors of risk for adverse events. Among hemodynamic variables, change in cardiac index, peak cardiac time interval, and peak left cardiac work index were the strongest predictors of risk. Having five impaired CPX and ICG responses to exercise yielded a seven-fold higher risk for adverse events compared to having no abnormal responses. Combining ICG responses to CPX resulted in NRIs ranging between 0.34 to 0.89, attributable to better reclassification of events.Cardiac hemodynamics determined by ICG complement established CPX measures in reclassifying risk among patients with HF.

  View details for DOI 10.1016/j.cardfail.2019.08.013

  View details for PubMedID 31454685

• Personalized prediction of adverse heart and kidney events using baseline and longitudinal data from SPRINT and ACCORD. PloS one Dinstag, G., Amar, D., Ingelsson, E., Ashley, E., Shamir, R. 2019; 14 (8): e0219728

  Abstract

  The 2017 guidelines of the American College of Cardiology and the American Heart Association propose substantial changes to hypertension management. The guidelines lower the blood pressure threshold defining hypertension and promote more aggressive treatments. Thus, more individuals are now classified as hypertensive and as a result, medication usage may become more extensive. An inevitable byproduct of greater medication use is higher incidence of adverse effects. Here, we examined these issues by developing models that predict both cardiovascular events and other adverse events based on the treatment chosen and other patient's data.We used data from the SPRINT trial to produce patient-specific predictions of the risks for adverse cardiovascular or kidney outcomes. Unlike prior models, we used both the baseline characteristics collected upon recruitment and the longitudinal data during the follow-up. Importantly, our cardiovascular predictor outperformed extant models on SPRINT participants, achieving AUC = 0.765, and was validated with good performance in an independent cohort of the ACCORD trial.Our study illustrates the importance of including longitudinal data for assessing personalized risk and provides means for recommending personalized treatment decisions.

  View details for DOI 10.1371/journal.pone.0219728

  View details for PubMedID 31393900

• IL6ST RELATED IMMUNODEFICIENCY DISORDER: A CASE REPORT AND REVIEW OF LITERATURE Velez-Bartolomei, F., Zastrow, D., McCormack, C., Kohler, J., Ud, N., Fisher, P., Ashley, E., Wheeler, M., Bernstein, J. BMJ PUBLISHING GROUP. 2019: 208

  View details for DOI 10.1136/jim-2018-000939.331

  View details for Web of Science ID 000457712500341

• DNASE1L3 RELATED AUTOIMMUNE SYNDROME: A CASE REPORT AND REVIEW OF THE LITERATURE Schymick, J., Bonner, D., Majcherska, M., McCormack, C., Fresard, L., Smith, K., Montgomery, S., Fisher, P., Ashley, E., Ud, N., Maller, J., Hsu, J., Balboni, I., Wheeler, M., Bernstein, J. BMJ PUBLISHING GROUP. 2019: 80?81

  View details for DOI 10.1136/jim-2018-000939.40

  View details for Web of Science ID 000457712500050

• A Patient with Sjogren's Syndrome and Subsequent Diagnosis of Inclusion Body Myositis and Light-Chain Amyloidosis. Journal of general internal medicine Hom, J., Marwaha, S., Postolova, A., Kittle, J., Vasquez, R., Davidson, J., Kohler, J., Dries, A., Fernandez-Betancourt, L., Majcherska, M., Dearlove, J., Raghavan, S., Vogel, H., Bernstein, J. A., Fisher, P., Ashley, E., Sampson, J., Wheeler, M. 2019

  Abstract

  We discuss a challenging case of a 58-year-old Vietnamese-American woman who presented to her new primary care provider with an 8-year history of slowly progressive dysphagia, hoarseness, muscle weakness with associated frequent falls, and weight loss. She eventually reported dry eyes and dry mouth, and she was diagnosed with Sjogren's syndrome. Subsequently, she was additionally diagnosed with inclusion body myositis and gastric light-chain (AL) amyloidosis. Although inclusion body myositis has been previously associated with Sjogren's syndrome, inclusion body myositis is rare in non-Caucasians, and the trio of Sjogren's syndrome, inclusion body myositis, and AL amyloidosis has not been previously reported. Sjogren's syndrome is a systemic autoimmune condition characterized by ocular and oral dryness. It is one of the most common rheumatologic disorders in the USA and worldwide. Early diagnosis of Sjogren's is particularly important given the frequency and variety of associated autoimmune diseases and extraglandular manifestations. Furthermore, although inclusion body myositis has a low prevalence, it is the most common inflammatory myopathy in older adults and is unfortunately associated with long delays in diagnosis, so knowledge of this disorder is also crucial for practicing internists.

  View details for PubMedID 30887439

• A novel noninvasive method for remote heart failure monitoring: the EuleriAn video Magnification apPLications In heart Failure studY (AMPLIFY). NPJ digital medicine Abnousi, F., Kang, G., Giacomini, J., Yeung, A., Zarafshar, S., Vesom, N., Ashley, E., Harrington, R., Yong, C. 2019; 2: 80

  Abstract

  Current remote monitoring devices for heart failure have been shown to reduce hospitalizations but are invasive and costly; accurate non-invasive options remain limited. The EuleriAn Video Magnification ApPLications In Heart Failure StudY (AMPLIFY) pilot aimed to evaluate the accuracy of a novel noninvasive method that uses Eulerian video magnification. Video recordings were performed on the neck veins of 50 patients who were scheduled for right heart catheterization at the Palo Alto VA Medical Center. The recorded jugular venous pulsations were then enhanced by applying Eulerian phase-based motion magnification. Assessment of jugular venous pressure was compared across three categories: (1) physicians who performed bedside exams, (2) physicians who reviewed both the amplified and unamplified videos, and (3) direct invasive measurement of right atrial pressure from right heart catheterization. Motion magnification reduced inaccuracy of the clinician assessment of central venous pressure compared to the gold standard of right heart catheterization (mean discrepancy of -0.80cm H2O; 95% CI -2.189 to 0.612, p=0.27) when compared to both unamplified video (-1.84cm H2O; 95% CI -3.22 to -0.46, p=0.0096) and the bedside exam (-2.90cm H2O; 95% CI -4.33 to 1.40, p=0.0002). Major categorical disagreements with right heart catheterization were significantly reduced with motion magnification (12%) when compared to unamplified video (25%) or the bedside exam (27%). This novel method of assessing jugular venous pressure improves the accuracy of the clinical exam and may enable accurate remote monitoring of heart failure patients with minimal patient risk.

  View details for DOI 10.1038/s41746-019-0159-0

  View details for PubMedID 31453375

• Genomics in medicine: a novel elective rotation for internal medicine residents. Postgraduate medical journal Geng, L. N., Kohler, J. N., Levonian, P., Bernstein, J. A., Ford, J. M., Ahuja, N., Witteles, R., Hom, J., Wheeler, M. 2019

  Abstract

  It is well recognised that medical training globally and at all levels lacks sufficient incorporation of genetics and genomics education to keep up with the rapid advances and growing application of genomics to clinical care. However, the best strategy to implement these desired changes into postgraduate medical training and engage learners is still unclear. We developed a novel elective rotation in 'Genomic Medicine and Undiagnosed Diseases' for categorical Internal Medicine Residents to address this educational gap and serve as an adaptable model for training that can be applied broadly across different specialties and at other institutions. Key curriculum goals achieved include increased understanding about genetic testing modalities and tools available for diagnosis and risk analysis, the role of genetics-trained allied health professionals, and indications and limitations of genetic and genomic testing in both rare and common conditions.

  View details for DOI 10.1136/postgradmedj-2018-136355

  View details for PubMedID 31439813

• Athletic Remodeling in Female College Athletes: The "Morganroth Hypothesis" Revisited. Clinical journal of sport medicine : official journal of the Canadian Academy of Sport Medicine Kooreman, Z., Giraldeau, G., Finocchiaro, G., Kobayashi, Y., Wheeler, M., Perez, M., Moneghetti, K., Oxborough, D., George, K. P., Myers, J., Ashley, E., Haddad, F. 2019; 29 (3): 224?31

  Abstract

  There is limited data regarding ventricular remodeling in college female athletes, especially when appropriate scaling of cardiac dimensions to lean body mass (LBM) is considered. Moreover, it is not well established whether cardiac remodeling in female athletes is a balanced process with proportional increase in left ventricular (LV) mass and volume or the right and LV size.During the preparticipation competitive screening, 72 female college athletes volunteered to undergo dual energy x-ray absorptiometry scan for quantification of LBM and comprehensive 2D echocardiography including assessment of longitudinal myocardial strain. The athletes were divided in 2 groups according to the intensity of the dynamic and static components of their sport categories, ie, a higher intensity dynamic and resistive group (n = 37 participating in rowing, water polo and lacrosse) and a lower intensity group (n = 35, participating in short distance running, sailing, synchronized swimming, and softball). In addition, we recruited a group of 31 age-matched nonathlete controls.The mean age of the study population was 18.7 ± 1.0 years. When scaled to body surface area, the higher intensity group had 17.1 ± 3.6% (P < 0.001) greater LV mass when compared with the lower intensity group and 21.7 ± 4.0% (P < 0.001) greater LV mass than the control group. The differences persisted after scaling to LBM with 14.2 ± 3.2% (P < 0.001) greater LV mass in the higher intensity group. By contrast, there was no difference in any of the relative remodeling indices including the LV mass to volume ratio, right to LV area ratio, or left atrial to LV volume ratio (P > 0.50 for all). In addition, no significant difference was noted among the 3 groups in LV ejection fraction (P = 0.22), LV global longitudinal strain (P = 0.55), LV systolic strain rate (P = 0.62), or right ventricular global longitudinal strain (P = 0.61).Female collegiate athletes participating in higher intensity dynamic and resistive sports have higher indexed LV mass even when scaled to LBM. The remodeling process does however appear to be a balanced process not only at the intraventricular level but also at the interventricular and atrioventricular levels.

  View details for PubMedID 31033616

• A toolkit for genetics providers in follow-up of patients with non-diagnostic exome sequencing. Journal of genetic counseling Zastrow, D. B., Kohler, J. N., Bonner, D., Reuter, C. M., Fernandez, L., Grove, M. E., Fisk, D. G., Yang, Y., Eng, C. M., Ward, P. A., Bick, D., Worthey, E. A., Fisher, P. G., Ashley, E. A., Bernstein, J. A., Wheeler, M. T. 2019; 28 (2): 213?28

  Abstract

  There are approximately 7,000 rare diseases affecting 25-30 million Americans, with 80% estimated to have a genetic basis. This presents a challenge for genetics practitioners to determine appropriate testing, make accurate diagnoses, and conduct up-to-date patient management. Exome sequencing (ES) is a comprehensive diagnostic approach, but only 25%-41% of the patients receive a molecular diagnosis. The remaining three-fifths to three-quarters of patients undergoing ES remain undiagnosed. The Stanford Center for Undiagnosed Diseases (CUD), a clinical site of the Undiagnosed Diseases Network, evaluates patients with undiagnosed and rare diseases using a combination of methods including ES. Frequently these patients have non-diagnostic ES results, but strategic follow-up techniques identify diagnoses in a subset. We present techniques used at the CUD that can be adopted by genetics providers in clinical follow-up of cases where ES is non-diagnostic. Solved case examples illustrate different types of non-diagnostic results and the additional techniques that led to a diagnosis. Frequent approaches include segregation analysis, data reanalysis, genome sequencing, additional variant identification, careful phenotype-disease correlation, confirmatory testing, and case matching. We also discuss prioritization of cases for additional analyses.

  View details for PubMedID 30964584

• Targeting ferroptosis: A novel therapeutic strategy for the treatment of mitochondrial disease-related epilepsy. PloS one Kahn-Kirby, A. H., Amagata, A., Maeder, C. I., Mei, J. J., Sideris, S., Kosaka, Y., Hinman, A., Malone, S. A., Bruegger, J. J., Wang, L., Kim, V., Shrader, W. D., Hoff, K. G., Latham, J. C., Ashley, E. A., Wheeler, M. T., Bertini, E., Carrozzo, R., Martinelli, D., Dionisi-Vici, C., Chapman, K. A., Enns, G. M., Gahl, W., Wolfe, L., Saneto, R. P., Johnson, S. C., Trimmer, J. K., Klein, M. B., Holst, C. R. 2019; 14 (3): e0214250

  Abstract

  Mitochondrial disease is a family of genetic disorders characterized by defects in the generation and regulation of energy. Epilepsy is a common symptom of mitochondrial disease, and in the vast majority of cases, refractory to commonly used antiepileptic drugs. Ferroptosis is a recently-described form of iron- and lipid-dependent regulated cell death associated with glutathione depletion and production of lipid peroxides by lipoxygenase enzymes. Activation of the ferroptosis pathway has been implicated in a growing number of disorders, including epilepsy. Given that ferroptosis is regulated by balancing the activities of glutathione peroxidase-4 (GPX4) and 15-lipoxygenase (15-LO), targeting these enzymes may provide a rational therapeutic strategy to modulate seizure. The clinical-stage therapeutic vatiquinone (EPI-743, ?-tocotrienol quinone) was reported to reduce seizure frequency and associated morbidity in children with the mitochondrial disorder pontocerebellar hypoplasia type 6. We sought to elucidate the molecular mechanism of EPI-743 and explore the potential of targeting 15-LO to treat additional mitochondrial disease-associated epilepsies.Primary fibroblasts and B-lymphocytes derived from patients with mitochondrial disease-associated epilepsy were cultured under standardized conditions. Ferroptosis was induced by treatment with the irreversible GPX4 inhibitor RSL3 or a combination of pharmacological glutathione depletion and excess iron. EPI-743 was co-administered and endpoints, including cell viability and 15-LO-dependent lipid oxidation, were measured.EPI-743 potently prevented ferroptosis in patient cells representing five distinct pediatric disease syndromes with associated epilepsy. Cytoprotection was preceded by a dose-dependent decrease in general lipid oxidation and the specific 15-LO product 15-hydroxyeicosatetraenoic acid (15-HETE).These findings support the continued clinical evaluation of EPI-743 as a therapeutic agent for PCH6 and other mitochondrial diseases with associated epilepsy.

  View details for PubMedID 30921410

• Defining genotype-phenotype relationships in patients with hypertrophic cardiomyopathy using cardiovascular magnetic resonance imaging. PloS one Miller, R. J., Heidary, S., Pavlovic, A., Schlachter, A., Dash, R., Fleischmann, D., Ashley, E. A., Wheeler, M. T., Yang, P. C. 2019; 14 (6): e0217612

  Abstract

  HCM is the most common inherited cardiomyopathy. Historically, there has been poor correlation between genotype and phenotype. However, CMR has the potential to more accurately assess disease phenotype. We characterized phenotype with CMR in a cohort of patients with confirmed HCM and high prevalence of genetic testing.Patients with a diagnosis of HCM, who had undergone contrast-enhanced CMR were identified. Left ventricular mass index (LVMI) and volumes were measured from steady-state free precession sequences. Late gadolinium enhancement (LGE) was quantified using the full width, half maximum method. All patients were prospectively followed for the development of septal reduction therapy, arrhythmia or death.We included 273 patients, mean age 51.2 ± 15.5, 62.9% male. Of those patients 202 (74.0%) underwent genetic testing with 90 pathogenic, likely pathogenic, or rare variants and 13 variants of uncertain significance identified. Median follow-up was 1138 days. Mean LVMI was 82.7 ± 30.6 and 145 patients had late gadolinium enhancement (LGE). Patients with beta-myosin heavy chain (MYH7) mutations had higher LV ejection fraction (68.8 vs 59.1, p<0.001) than those with cardiac myosin binding protein C (MYBPC3) mutations. Patients with MYBPC3 mutations were more likely to have LVEF < 55% (29.7% vs 4.9%, p = 0.005) or receive a defibrillator than those with MYH7 mutations (54.1% vs 26.8%, p = 0.020).We found that patients with MYBPC3 mutations were more likely to have impaired ventricular function and may be more prone to arrhythmic events. Larger studies using CMR phenotyping may be capable of identifying additional characteristics associated with less frequent genetic causes of HCM.

  View details for DOI 10.1371/journal.pone.0217612

  View details for PubMedID 31199839

• Developing a genomics rotation: Practical training around variant interpretation for genetic counseling students. Journal of genetic counseling Grove, M. E., White, S., Fisk, D. G., Rego, S., Dagan-Rosenfeld, O., Kohler, J. N., Reuter, C. M., Bonner, D., Wheeler, M. T., Bernstein, J. A., Ormond, K. E., Hanson-Kahn, A. K. 2019

  Abstract

  With the wide adoption of next-generation sequencing (NGS)-based genetic tests, genetic counselors require increased familiarity with NGS technology, variant interpretation concepts, and variant assessment tools. The use of exome and genome sequencing in clinical care has expanded the reach and diversity of genetic testing. Regardless of the setting where genetic counselors are performing variant interpretation or reporting, most of them have learned these skills from colleagues, while on the job. Though traditional, lecture-based learning around these topics is important, there has been growing need for the inclusion of case-based, experiential training of genomics and variant interpretation for genetic counseling students, with the goal of creating a strong foundation in variant interpretation for new genetic counselors, regardless of what area of practice they enter. To address this need, we established a genomics and variant interpretation rotation for Stanford's genetic counseling training program. In response to changes in the genomics landscape, this has now evolved into three unique rotation experiences, each focused on variant interpretation in the context of various genomic settings, including clinical laboratory, research laboratory, and healthy genomic analysis studies. Here, we describe the goals and learning objectives that we have developed for these variant interpretation rotations, and illustrate how these concepts are applied in practice.

  View details for PubMedID 30706981

• The Myheart Counts Cardiovascular Health Study: A Randomized Controlled Trial of Digital Health Coaching for Physical Activity Promotion Shcherbina, A., Hershman, S., King, A. C., Hekler, E., Pavlovic, A., Waggott, D., McConnell, M. V., Ashley, E. A., Harrington, R. A. LIPPINCOTT WILLIAMS & WILKINS. 2018: E767

  View details for Web of Science ID 000453713500032

• Loss of function, missense, and intronic variants in NOTCH1 confer different risks for left ventricular outflow tract obstructive heart defects in two European cohorts. Genetic epidemiology Helle, E., Cordova-Palomera, A., Ojala, T., Saha, P., Potiny, P., Gustafsson, S., Ingelsson, E., Bamshad, M., Nickerson, D., Chong, J. X., University of Washington Center for Mendelian Genomics, Ashley, E., Priest, J. R. 2018

  Abstract

  Loss of function variants in NOTCH1 cause left ventricular outflow tract obstructive defects (LVOTO). However, the risk conferred by rare and noncoding variants in NOTCH1 for LVOTO remains largely uncharacterized. In a cohort of 49 families affected by hypoplastic left heart syndrome, a severe form of LVOTO, we discovered predicted loss of function NOTCH1 variants in 6% of individuals. Rare or low-frequency missense variants were found in 16% of families. To make a quantitative estimate of the genetic risk posed by variants in NOTCH1 for LVOTO, we studied associations of 400 coding and noncoding variants in NOTCH1 in 1,085 cases and 332,788 controls from the UK Biobank. Two rare intronic variants in strong linkage disequilibrium displayed significant association with risk for LVOTO amongst European-ancestry individuals. This result was replicated in an independent analysis of 210 cases and 68,762 controls of non-European and mixed ancestry. In conclusion, carrying rare predicted loss of function variants in NOTCH1 confer significant risk for LVOTO. In addition, the two intronic variants seem to be associated with an increased risk for these defects. Our approach demonstrates the utility of population-based data sets in quantifying the specific risk of individual variants for disease-related phenotypes.

  View details for PubMedID 30511478

• Genotype and Lifetime Burden of Disease in Hypertrophic Cardiomyopathy: Insights From the Sarcomeric Human Cardiomyopathy Registry (SHaRe) CIRCULATION Ho, C. Y., Day, S. M., Ashley, E. A., Michels, M., Pereira, A. C., Jacoby, D., Cirino, A. L., Fox, J. C., Lakdawala, N. K., Ware, J. S., Caleshu, C. A., Helms, A. S., Colan, S. D., Girolami, F., Cecchi, F., Seidman, C. E., Sajeev, G., Signorovitch, J., Green, E. M., Olivotto, I., SHaRe Investigators 2018; 138 (14): 1387?98

  Abstract

  A better understanding of the factors that contribute to heterogeneous outcomes and lifetime disease burden in hypertrophic cardiomyopathy (HCM) is critically needed to improve patient management and outcomes. The Sarcomeric Human Cardiomyopathy Registry (SHaRe) was established to provide the scale of data required to address these issues, aggregating longitudinal datasets curated by eight international HCM specialty centers.Data on 4591 HCM patients (2763 genotyped), followed for a mean of 5.4±6.9 years (24,791 patient-years; median [interquartile range] 2.9 [0.3-7.9] years) were analyzed regarding cardiac arrest, cardiac transplantation, appropriate implantable cardioverter-defibrillator (ICD) therapy, all-cause death, atrial fibrillation, stroke, New York Heart Association Functional Class III/IV symptoms (all comprising the overall composite endpoint), and left ventricular ejection fraction (LVEF)<35%. Outcomes were analyzed individually and as composite endpoints.Median age of diagnosis was 45.8 [30.9-58.1] years and 37% of patients were female. Age of diagnosis and sarcomere mutation status were predictive of outcomes. Patients <40 years old at diagnosis had a 77% [95% confidence interval: 72%, 80%] cumulative incidence of the overall composite outcome by age 60, compared to 32% [29%, 36%] by age 70 for patients diagnosed >60 years. Young HCM patients (20-29 years) had 4-fold higher mortality than the general United States population at a similar age. Patients with pathogenic/likely pathogenic sarcomere mutations had two-fold greater risk for adverse outcomes compared to patients without mutations; sarcomere variants of uncertain significance were associated with intermediate risk. Heart failure and atrial fibrillation were the most prevalent adverse events, although typically not emerging for several years after diagnosis. Ventricular arrhythmias occurred in 32% [23%, 40%] of patients <40 years at diagnosis, but in 1% [1%, 2%] >60 years.The cumulative burden of HCM is substantial and dominated by heart failure and atrial fibrillation occurring many years following diagnosis. Young age of diagnosis and the presence of a sarcomere mutation are powerful predictors of adverse outcomes. These findings highlight the need for close surveillance throughout life, and the need to develop disease-modifying therapies.

  View details for PubMedID 30297972

  View details for PubMedCentralID PMC6170149

• A Premature Termination Codon Mutation in MYBPC3 Causes Hypertrophic Cardiomyopathy via Chronic Activation of Nonsense-Mediated Decay. Circulation Seeger, T., Shrestha, R., Lam, C. K., Chen, C., McKeithan, W. L., Lau, E., Wnorowski, A., McMullen, G., Greenhaw, M., Lee, J., Oikonomopoulos, A., Lee, S., Yang, H., Mercola, M., Wheeler, M., Ashley, E. A., Yang, F., Karakikes, I., Wu, J. C. 2018

  Abstract

  BACKGROUND: Hypertrophic cardiomyopathy (HCM) is frequently caused by mutations in myosin binding protein C3 ( MYBPC3) resulting in a premature termination codon (PTC). The underlying mechanisms of how PTC mutations in MYBPC3 lead to the onset and progression of HCM are poorly understood. This study's aim was to investigate the molecular mechanisms underlying the pathogenesis of HCM associated with MYBPC3 PTC mutations by utilizing human isogenic induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs).METHODS: Isogenic iPSC lines were generated from patients harboring MYBPC3 PTC mutations (p.R943x; p.R1073P_Fsx4) using genome editing and then differentiated into cardiomyocytes. Comprehensive phenotypical and transcriptome analyses were performed.RESULTS: We observed aberrant calcium handling properties with prolonged decay kinetics and elevated diastolic calcium levels in HCM iPSC-CMs compared to isogenic controls without structural abnormalities or contractile dysfunction. The mRNA expression levels of MYBPC3 were significantly reduced in mutant iPSC-CMs, but the protein levels were comparable among isogenic iPSC-CMs, suggesting that haploinsufficiency of MYBPC3 does not contribute to the pathogenesis of HCM in vitro. Furthermore, truncated MYBPC3 peptides were not detected. At the molecular level, the nonsense-mediated decay (NMD) pathway was activated, and a set of genes involved in major cardiac signaling pathways was dysregulated in HCM iPSC-CMs, indicating an HCM gene signature in vitro. Specific inhibition of the NMD pathway in mutant iPSC-CMs resulted in reversal of the molecular phenotype and normalization of calcium handling abnormalities.CONCLUSIONS: iPSC-CMs carrying MYBPC3 PTC mutations displayed aberrant calcium signaling and molecular dysregulations in the absence of significant haploinsufficiency of MYBPC3 protein. Here we provided the first evidence of the direct connection between the chronically activated NMD pathway and HCM disease development.

  View details for PubMedID 30586709

• Incident Atrial Fibrillation Is Associated With MYH7 Sarcomeric Gene Variation in Hypertrophic Cardiomyopathy. Circulation. Heart failure Lee, S., Ashley, E. A., Homburger, J., Caleshu, C., Green, E. M., Jacoby, D., Colan, S. D., Arteaga-Fernandez, E., Day, S. M., Girolami, F., Olivotto, I., Michels, M., Ho, C. Y., Perez, M. V., SHaRe Investigators 2018; 11 (9): e005191

  Abstract

  Background Although atrial fibrillation (AF) is common in hypertrophic cardiomyopathy (HCM) patients, the relationship between genetic variation and AF has been poorly defined. Characterizing genetic subtypes of HCM and their associations with AF may help to improve personalized medical care. We aimed to investigate the link between sarcomeric gene variation and incident AF in HCM patients. Methods and Results Patients from the multinational Sarcomeric Human Cardiomyopathy Registry were followed for incident AF. Those with likely pathogenic or pathogenic variants in sarcomeric genes were included. The AF incidence was ascertained by review of medical records and electrocardiograms at each investigative site. One thousand forty adult HCM patients, without baseline AF and with likely pathogenic or pathogenic variation in either MYH7 (n=296), MYBPC3 (n=659), or thin filament genes (n=85), were included. Compared with patients with variation in other sarcomeric genes, those with MYH7 variants were younger on first clinical encounter at the Sarcomeric Human Cardiomyopathy Registry site and more likely to be probands than the MYBPC3 variants. During an average follow-up of 7.2 years, 198 incident AF events occurred. Patients with likely pathogenic or pathogenic mutations in MYH7 had the highest incidence of AF after adjusting for age, sex, proband status, left atrial size, maximal wall thickness, and peak pressure gradient (hazard ratio, 1.7; 95% CI, 1.1-2.6; P=0.009). Conclusions During a mean follow-up of 7.2 years, new-onset AF developed in 19% of HCM patients with sarcomeric mutations. Compared with other sarcomeric genes, patients with likely pathogenic or pathogenic variation in MYH7 had a higher rate of incident AF independent of clinical and echocardiographic factors.

  View details for PubMedID 30354366

• Telomere shortening is a hallmark of genetic cardiomyopathies. Proceedings of the National Academy of Sciences of the United States of America Chang, A. C., Chang, A. C., Kirillova, A., Sasagawa, K., Su, W., Weber, G., Lin, J., Termglinchan, V., Karakikes, I., Seeger, T., Dainis, A. M., Hinson, J. T., Seidman, J., Seidman, C. E., Day, J. W., Ashley, E., Wu, J. C., Blau, H. M. 2018

  Abstract

  This study demonstrates that significantly shortened telomeres are a hallmark of cardiomyocytes (CMs) from individuals with end-stage hypertrophic cardiomyopathy (HCM) or dilated cardiomyopathy (DCM) as a result of heritable defects in cardiac proteins critical to contractile function. Positioned at the ends of chromosomes, telomeres are DNA repeats that serve as protective caps that shorten with each cell division, a marker of aging. CMs are a known exception in which telomeres remain relatively stable throughout life in healthy individuals. We found that, relative to healthy controls, telomeres are significantly shorter in CMs of genetic HCM and DCM patient tissues harboring pathogenic mutations: TNNI3, MYBPC3, MYH7, DMD, TNNT2, and TTN Quantitative FISH (Q-FISH) of single cells revealed that telomeres were significantly reduced by 26% in HCM and 40% in DCM patient CMs in fixed tissue sections compared with CMs from age- and sex-matched healthy controls. In the cardiac tissues of the same patients, telomere shortening was not evident in vascular smooth muscle cells that do not express or require the contractile proteins, an important control. Telomere shortening was recapitulated in DCM and HCM CMs differentiated from patient-derived human-induced pluripotent stem cells (hiPSCs) measured by two independent assays. This study reveals telomere shortening as a hallmark of genetic HCM and DCM and demonstrates that this shortening can be modeled in vitro by using the hiPSC platform, enabling drug discovery.

  View details for PubMedID 30150400

• Prevalence and Progression of Late Gadolinium Enhancement in Children and Adolescents With Hypertrophic Cardiomyopathy CIRCULATION Raja, A., Farhad, H., Valente, A., Couce, J., Jefferies, J., Bundgaard, H., Zahka, K., Lever, H., Murphy, A. M., Ashley, E., Day, S. M., Sherrid, M. V., Shi, L., Bluemke, D. A., Canter, C. E., Colan, S. D., Ho, C. Y. 2018; 138 (8): 782?92

  Abstract

  Background -Late gadolinium enhancement (LGE) on cardiac magnetic resonance imaging (CMR) is believed to represent dense replacement fibrosis. It is seen in ~60% of adult patients with hypertrophic cardiomyopathy (HCM). However, the prevalence of LGE in children and adolescents with HCM is not well established. Additionally, longitudinal studies describing the development and evolution of LGE in pediatric HCM are lacking. This study assesses the prevalence, progression, and clinical correlations of LGE in children and adolescents with, or genetically predisposed to, HCM. Methods -CMR scans from 195 HCM patients ?21 years of age were analyzed in an observational, retrospective study, including 155 with overt HCM and 40 sarcomere mutation carriers without left ventricular (LV) hypertrophy. The extent of LGE was quantified by measuring regions with signal intensity >6 SD above nulled remote myocardium. Results -Patients were 14.3 ± 4.5 years old at baseline and 68% were male. LGE was present in 70 (46%) patients with overt HCM (median extent 3.3% [IQR 0.8 to 7.1]), but absent in mutation carriers without LVH. Thirty-one patients had more than one CMR (median interval between studies 2.4 years [IQR 1.5 to 3.2]). LGE was detected in 13 patients (42%) at baseline and 16 (52%) at follow-up CMR. The median extent of LGE increased by 2.4 g/year (range 0 to 13.2) from 2.9% (IQR 0.8 to 3.2) of LV mass to 4.3% (IQR 2.9 to 6.8) (p=0.02). In addition to LGE, LV mass and left atrial volume, indexed to body surface area, as well as z-score for LV mass increased significantly from first to most recent CMR. Conclusions -LGE was present in 46% of children and adolescents with overt HCM, in contrast to ~60% typically reported in adult HCM. In the subset of patients with serial imaging, statistically significant increases in LGE, left ventricular mass and left atrial size were detected over 2.5 years, indicating disease progression over time. Further prospective studies are required to confirm these findings and to better understand the clinical implications of LGE in pediatric HCM.

  View details for PubMedID 29622585

• What's in a Name? Factors That Influence the Usage of Generic Versus Trade Names for Cardiac Medications Among Healthcare Providers CIRCULATION-CARDIOVASCULAR QUALITY AND OUTCOMES Ouyang, D., Tisdale, R., Cheng, P., Chi, J., Chen, J. H., Ashley, E. 2018; 11 (8)

  View details for DOI 10.1161/CIRCOUTCOMES.118.004704

  View details for Web of Science ID 000442242700009

• Serial echo-cardiopulmonary exercise test ramping for evaluation of patients with VAD Christle, J. W., Moneghetti, K., Haddad, F., Myers, J., Ashley, E. A., Wheeler, M., Banerjee, D. OXFORD UNIV PRESS. 2018: 386

  View details for Web of Science ID 000459824001232

• Time based versus strain based myocardial performance indices in hypertrophic cardiomyopathy, the merging role of left atrial strain. European heart journal cardiovascular Imaging Kobayashi, Y., Moneghetti, K. J., Bouajila, S., Stolfo, D., Finocchiaro, G., Kuznetsova, T., Liang, D., Schnittger, I., Ashley, E., Wheeler, M., Haddad, F. 2018

  Abstract

  Aims: The myocardial performance index (MPI) is a time-based index of global myocardial performance. In this study, we sought to compare the prognostic value of the MPI with other strain and remodelling indices in hypertrophic cardiomyopathy (HCM).Methods and results: We enrolled 126 patients with HCM and 50 age- and sex-matched controls. Along with traditional echocardiographic assessment, MPI, left ventricular global longitudinal strain (LVGLS), E/e' ratio, and total left atrial (LA) global strain (LAS) were also measured. Time-based MPI was calculated from flow or tissue-based pulse wave Doppler (PWD and TDI) as the (isovolumic-relaxation and contraction time)/systolic-time. We used hierarchical clustering and network analysis to better visualize the relationship between parameters. The primary endpoint was the composite of all-cause death, heart transplantation, left ventricular assist device implantation, and clinical worsening. Left ventricular outflow tract (LVOT) obstruction was present in 56% of patients. Compared with controls, patients with HCM had worse LVGLS (-14.0±3.4% vs. -19.6±1.5%), higher E/e' (12.9±7.2 vs. 6.1±1.5), LA volume index (LAVI) (36.4±13.8ml/m2 vs. 25.6±6.7ml/m2), and MPI (0.55±0.17 vs. 0.40±0.11 for PWD and 0.59±0.22 vs. 0.46±0.09 for TDI) (all P<0.001). During a median follow-up of 55months, 47 endpoints occurred. PWD or TDI-based MPI was not associated with outcome, while LAVI, LAS, LVGLS, and E/e' were (all P<0.01). On multivariable analysis, LVOT obstruction (P<0.001), LAS (P<0.001), and E/e' (P=0.02) were retained as independent associates. They were in different clusters suggesting complemental relationship between them.Conclusion: Time-based index is less predictive of outcome than strain or tissue Doppler indices. LAS may be a promising prognostic marker in HCM.

  View details for PubMedID 30060097

• Genome Sequencing in HypertrophicCardiomyopathy. Journal of the American College of Cardiology Ashley, E. A., Reuter, C. M., Wheeler, M. T. 2018; 72 (4): 430?33

  View details for PubMedID 30025579

• Applying current normative data to prognosis in heart failure: The Fitness Registry and the Importance of Exercise National Database (FRIEND) INTERNATIONAL JOURNAL OF CARDIOLOGY Moneghetti, K. J., Hock, J., Kaminsky, L., Arena, R., Lui, G. K., Haddad, F., Wheeler, M., Froelicher, V., Ashley, E., Myers, J., Christle, J. W. 2018; 263: 75?79

  Abstract

  Percent of predicted peak VO2 (ppVO2) is considered a standard measure for establishing disease severity, however, there are known limitations to traditional normative values. This study sought to compare ppVO2 from the newly derived "Fitness Registry and the Importance of Exercise: a National Database" (FRIEND) registry equation to conventional prediction equations in a clinical cohort of patients undergoing cardiopulmonary exercise testing (CPX).We selected 1094 patients referred for evaluation of heart failure (HF) symptoms who underwent CPX. ppVO2 was calculated using the FRIEND, Wasserman/Hansen and Jones equations. Participants were followed for a median of 4.5?years [Interquartile range 3.5-6.0] for the composite endpoint of death, advanced HF therapy, or acute decompensated HF requiring hospital admission. Mean age was 48?±?15?years and 62% were female. The FRIEND registry equation predicted the lowest ppVO2 (measured/predicted; 71?±?31%), compared to the Wasserman/Hansen (74?±?29%) and Jones equations (83?±?33%) (p?

  View details for PubMedID 29525067

• Mobile Health Advances in Physical Activity, Fitness, and Atrial Fibrillation Moving Hearts JOURNAL OF THE AMERICAN COLLEGE OF CARDIOLOGY McConnell, M. V., Turakhia, M. P., Harrington, R. A., King, A. C., Ashley, E. A. 2018; 71 (23): 2691?2701

  Abstract

  The growing recognition that "health" takes place outside of the hospital and clinic, plus recent advances in mobile and wearable devices, have propelled the field of mobile health (mHealth). Cardiovascular disease and prevention are major opportunities for mHealth, as mobile devices can monitor key physiological signals (e.g., physical activity, heart rate and rhythm) for promoting healthy behaviors, detecting disease, and aid in ongoing care. In this review, the authors provide an update on cardiovascular mHealth by highlighting recent progress and challenges with mobile and wearable devices for assessing and promoting physical activity and fitness, and for monitoring heart rate and rhythm for the detection and management of atrial fibrillation.

  View details for PubMedID 29880130

• Artificial Intelligence in Cardiology JOURNAL OF THE AMERICAN COLLEGE OF CARDIOLOGY Johnson, K. W., Soto, J., Glicksberg, B. S., Shameer, K., Miotto, R., Ali, M., Ashley, E., Dudley, J. T. 2018; 71 (23): 2668?79

  Abstract

  Artificial intelligence and machine learning are poised to influence nearly every aspect of the human condition, and cardiology is not an exception to this trend. This paper provides a guide for clinicians on relevant aspects of artificial intelligence and machine learning, reviews selected applications of these methods in cardiology to date, and identifies how cardiovascular medicine could incorporate artificial intelligence in the future. In particular, the paper first reviews predictive modeling concepts relevant to cardiology such as feature selection and frequent pitfalls such as improper dichotomization. Second, it discusses common algorithms used in supervised learning and reviews selected applications in cardiology and related disciplines. Third, it describes the advent of deep learning and related methods collectively called unsupervised learning, provides contextual examples both in general medicine and in cardiovascular medicine, and then explains how these methods could be applied to enable precision cardiology and improve patient outcomes.

  View details for PubMedID 29880128

• Apelin and APJ orchestrate complex tissue-specific control of cardiomyocyte hypertrophy and contractility in the hypertrophy-heart failure transition. American journal of physiology. Heart and circulatory physiology Parikh, V. N., Liu, J., Shang, C., Woods, C., Chang, A. C., Zhao, M., Charo, D. N., Grunwald, Z., Huang, Y., Seo, K., Tsao, P. S., Bernstein, D., Ruiz-Lozano, P., Quertermous, T., Ashley, E. A. 2018

  Abstract

  The G protein coupled receptor APJ is a promising therapeutic target for heart failure. Constitutive deletion of APJ in the mouse is protective against the hypertrophy-heart failure transition via elimination of ligand-independent, beta-arrestin dependent stretch transduction. However, the cellular origin of this stretch transduction and the details of its interaction with apelin signaling remain unknown. We generated mice with conditional elimination of APJ in the endothelium (APJendo-/-) and myocardium (APJmyo-/-). No baseline difference was observed in LV function in APJendo-/-, APJmyo-/- or controls (APJendo+/+, APJmyo+/+). After exposure to transaortic constriction (TAC), APJendo-/- animals developed left ventricular failure while APJmyo-/- were protected. At the cellular level, carbon fiber stretch of freshly isolated single cardiomyocytes demonstrated decreased contractile response to stretch in APJ-/- cardiomyocytes compared to APJ+/+ cardiomyocytes. Calcium transient did not change with stretch in either APJ-/- or APJ+/+ cardiomyocytes. Application of apelin to APJ+/+ cardiomyocytes resulted in decreased calcium transient. Further, hearts of mice treated with apelin exhibited decreased phosphorylation at Troponin I (cTnI) N-terminal residues (Ser 22,23), consistent with increased calcium sensitivity. These data establish that APJ stretch transduction is mediated specifically by myocardial APJ, that APJ is necessary for stretch-induced increases in contractility, and that apelin opposes APJ's stretch-mediated hypertrophy signaling by lowering calcium transient while maintaining contractility through myofilament calcium sensitization. These findings underscore apelin's unique potential as a therapeutic agent that can simultaneously support cardiac function and protect against the hypertrophy-heart failure transition.

  View details for PubMedID 29775410

• Acetaminophen or Tylenol? A Retrospective Analysis of Medication Digital Communication Practices. Journal of general internal medicine Ouyang, D., Tisdale, R., Ashley, E., Chi, J., Chen, J. H. 2018

  View details for PubMedID 29717410

• Right Ventricular Structure and Function in the Veteran Ultramarathon Runner: Is There Evidence for Chronic Maladaptation? JOURNAL OF THE AMERICAN SOCIETY OF ECHOCARDIOGRAPHY Rothwell, O., George, K., Somauroo, J., Lord, R., Stembridge, M., Shave, R., Hoffman, M. D., Wilson, M., Ashley, E., Haddad, F., Eijsvogels, T. H., Oxborough, D. 2018; 31 (5): 598-+

  Abstract

  It has been proposed that chronic exposure to prolonged strenuous exercise may result in maladaptation of the right ventricle (RV). The aim of this study was to establish RV structure and function, including septal insertion points, using conventional echocardiography and myocardial strain (?) imaging in a veteran population of ultramarathon runners (UR) and age- and sex-matched controls.A retrospective study design provided 40 UR (>35 years old; mean ± SD training experience, 18 ± 12 years) and 24 sedentary controls who had previously undergone conventional two-dimensional, tissue Doppler and speckle-tracking echocardiography to measure RV size and function. Peak RV ? and strain rate (SR) were assessed from the base, mid, and apical lateral wall. SR were assessed during systole (SRs'), early diastole (SRe') and late diastole (SRa'). Regional assessment of RV insertion points was made at the basal inferoseptum and apical septum using left ventricular (LV) longitudinal ? and at the anteroseptum and inferoseptum using LV circumferential and radial ?.All structural indices of RV size were significantly larger in UR. RV regional and global peak ? were not different between groups, whereas basal RV SR was significantly lower in UR. UR had significantly higher peak LV circumferential ? (anteroseptum, -26% ± 8% vs -21% ± 6%; inferoseptum, -25% ± 6% vs -16% ± 9%) and higher peak LV longitudinal ? (apical septum, -28% ± 7% vs -22% ± 4%) compared with controls. There was regional heterogeneity in UR that was not observed in controls with significantly lower longitudinal ? at the basal inferoseptal insertion point when compared with the global ? (-19% ± 2% vs -22% ± 4%).Myocardial ? imaging highlights no overt maladaptation in this cohort of veteran UR, although lower insertion point ?, compared with global ?, in UR may warrant further investigation.

  View details for PubMedID 29305036

• A reference equation for maximal aerobic power for treadmill and cycle ergometer exercise testing: Analysis from the FRIEND registry EUROPEAN JOURNAL OF PREVENTIVE CARDIOLOGY de Souza e Silva, C. G., Kaminsky, L. A., Arena, R., Christle, J. W., Araujo, C. S., Lima, R. M., Ashley, E. A., Myers, J. 2018; 25 (7): 742?50

  Abstract

  Background Maximal oxygen uptake (VO2max) is a powerful predictor of health outcomes. Valid and portable reference values are integral to interpreting measured VO2max; however, available reference standards lack validation and are specific to exercise mode. This study was undertaken to develop and validate a single equation for normal standards for VO2max for the treadmill or cycle ergometer in men and women. Methods Healthy individuals ( N?=?10,881; 67.8% men, 20-85 years) who performed a maximal cardiopulmonary exercise test on either a treadmill or a cycle ergometer were studied. Of these, 7617 and 3264 individuals were randomly selected for development and validation of the equation, respectively. A Brazilian sample (1619 individuals) constituted a second validation cohort. The prediction equation was determined using multiple regression analysis, and comparisons were made with the widely-used Wasserman and European equations. Results Age, sex, weight, height and exercise mode were significant predictors of VO2max. The regression equation was: VO2max (ml?kg-1?min-1)?=?45.2 - 0.35*Age - 10.9*Sex (male?=?1; female?=?2) - 0.15*Weight (pounds) + 0.68*Height (inches) - 0.46*Exercise Mode (treadmill?=?1; bike?=?2) ( R?=?0.79, R2?=?0.62, standard error of the estimate?=?6.6?ml?kg-1?min-1). Percentage predicted VO2max for the US and Brazilian validation cohorts were 102.8% and 95.8%, respectively. The new equation performed better than traditional equations, particularly among women and individuals ?60 years old. Conclusion A combined equation was developed for normal standards for VO2max for different exercise modes derived from a US national registry. The equation provided a lower average error between measured and predicted VO2max than traditional equations even when applied to an independent cohort. Additional studies are needed to determine its portability.

  View details for PubMedID 29517365

• Medical relevance of protein-truncating variants across 337,205 individuals in the UK Biobank study NATURE COMMUNICATIONS DeBoever, C., Tanigawa, Y., Lindholm, M. E., McInnes, G., Lavertu, A., Ingelsson, E., Chang, C., Ashley, E. A., Bustamante, C. D., Daly, M. J., Rivas, M. A. 2018; 9: 1612

  Abstract

  Protein-truncating variants can have profound effects on gene function and are critical for clinical genome interpretation and generating therapeutic hypotheses, but their relevance to medical phenotypes has not been systematically assessed. Here, we characterize the effect of 18,228 protein-truncating variants across 135 phenotypes from the UK Biobank and find 27 associations between medical phenotypes and protein-truncating variants in genes outside the major histocompatibility complex. We perform phenome-wide analyses and directly measure the effect in homozygous carriers, commonly referred to as "human knockouts," across medical phenotypes for genes implicated as being protective against disease or associated with at least one phenotype in our study. We find several genes with strong pleiotropic or non-additive effects. Our results illustrate the importance of protein-truncating variants in a variety of diseases.

  View details for PubMedID 29691392

• Biological Insights Into Muscular Strength: Genetic Findings in the UK Biobank SCIENTIFIC REPORTS Tikkanen, E., Gustafsson, S., Amar, D., Shcherbina, A., Waggott, D., Ashley, E. A., Ingelsson, E. 2018; 8: 6451

  Abstract

  We performed a large genome-wide association study to discover genetic variation associated with muscular strength, and to evaluate shared genetic aetiology with and causal effects of muscular strength on several health indicators. In our discovery analysis of 223,315 individuals, we identified 101 loci associated with grip strength (P?<5?×?10-8). Of these, 64 were associated (P?

  View details for PubMedID 29691431

• Large Q and S waves in lead III on the electrocardiogram distinguish patients with hypertrophic cardiomyopathy from athletes. Heart (British Cardiac Society) Chen, A. S., Bent, R. E., Wheeler, M., Knowles, J. W., Haddad, F., Froelicher, V., Ashley, E., Perez, M. V. 2018

  Abstract

  OBJECTIVE: To identify electrocardiographic findings, especially deep Q and S waves in lead III, that differentiate athletes from patients with hypertrophic cardiomyopathy (HCM).METHODS: Digital ECGs of athletes and patients with HCM followed at the Stanford Center for Inherited Cardiovascular Disease were studied retrospectively. All patients with HCM had an echocardiogram performed. A multivariable logistic regression model was used to calculate ORs for various demographic and ECG characteristics. Linear regression was used to correlate ECG characteristics with echocardiogram findings.RESULTS: We studied 1124 athletes and 240 patients with HCM. The average Q+Swave amplitude in lead III (IIIQ+S) was significantly higher in patients with HCM compared with athletes (0.71±0.69mV vs 0.21±0.17mV, p<0.001). In patients with HCM, IIIQ+S directly correlated with interventricular septal (IVS) thickness on echocardiography (rho=0.45, p<0.001). In a multivariable analysis adjusted for demographic and ECG characteristics, higher IIIQ+S values remained independently associated with HCM compared with athletes (OR=4.2 per 0.5mV, p<0.001). In subgroup analyses of young patients, African-American subjects and subjects without left axis deviation (LAD), IIIQ+S remained associated with HCM. The addition of IIIQ+S>1.0 mV as an abnormal finding to the International Criteria for athletic ECG interpretation improved sensitivity from 64.2% to 70.4%, with a minimal decrease in specificity.CONCLUSION: Large Q and S waves in lead III distinguished athletes from patients with HCM, independent of axis and well-known ECG markers associated with HCM. The correlation between IVS thickness in patients with HCM and IIIQ+S suggests a partial explanation for this association.

  View details for PubMedID 29680808

• Cardiovascular Precision Medicine in the Genomics Era. JACC. Basic to translational science Dainis, A. M., Ashley, E. A. 2018; 3 (2): 313?26

  Abstract

  Precision medicine strives to delineate disease using multiple data sources-from genomics to digital health metrics-in order to be more precise and accurate in our diagnoses, definitions, and treatments of disease subtypes. By defining disease at a deeper level, we can treat patients based on an understanding of the molecular underpinnings of their presentations, rather than grouping patients into broad categories with one-size-fits-all treatments. In this review, the authors examine how precision medicine, specifically that surrounding genetic testing and genetic therapeutics, has begun to make strides in both common and rare cardiovascular diseases in the clinic and the laboratory, and how these advances are beginning to enable us to more effectively define risk, diagnose disease, and deliver therapeutics for eachindividual patient.

  View details for PubMedID 30062216

• MEDICATION COMMUNICATION PRACTICES BETWEEN PROVIDERS IN CARDIOLOGY Tisdale, R., Ouyang, D., Cheng, P., Chi, J., Chen, J., Ashley, E. ELSEVIER SCIENCE INC. 2018: 2644

  View details for DOI 10.1016/S0735-1097(18)33185-1

  View details for Web of Science ID 000429659705094

• INTEGRATING CORRELATION BASED NETWORKS INTO RISK PROGNOSTICATION OF CARDIOMYOPATHY Moneghetti, K., Kim, J., Kobayashi, Y., Boralkar, K., Wheeler, M., Ashley, E., Haddad, F. ELSEVIER SCIENCE INC. 2018: 837

  View details for DOI 10.1016/S0735-1097(18)31378-0

  View details for Web of Science ID 000429659702087

• Biallelic Mutations in ATP5F1D, which Encodes a Subunit of ATP Synthase, Cause a Metabolic Disorder AMERICAN JOURNAL OF HUMAN GENETICS Olahova, M., Yoon, W., Thompson, K., Jangam, S., Fernandez, L., Davidson, J. M., Kyle, J. E., Grove, M. E., Fisk, D. G., Kohler, J. N., Holmes, M., Dries, A. M., Huang, Y., Zhao, C., Contrepois, K., Zappala, Z., Fresard, L., Waggott, D., Zink, E. M., Kim, Y., Heyman, H. M., Stratton, K. G., Webb-Robertson, B. M., Snyder, M., Merker, J. D., Montgomery, S. B., Fisher, P. G., Feichtinger, R. G., Mayr, J. A., Hall, J., Barbosa, I. A., Simpson, M. A., Deshpande, C., Waters, K. M., Koeller, D. M., Metz, T. O., Morris, A. A., Schelley, S., Cowan, T., Friederich, M. W., McFarland, R., Van Hove, J. K., Enns, G. M., Yamamoto, S., Ashley, E. A., Wangler, M. F., Taylor, R. W., Bellen, H. J., Bernstein, J. A., Wheeler, M. T., Undiagnosed Diseases Network 2018; 102 (3): 494?504

  Abstract

  ATP synthase, H+ transporting, mitochondrial F1 complex, ? subunit (ATP5F1D; formerly ATP5D) is a subunit of mitochondrial ATP synthase and plays an important role in coupling proton translocation and ATP production. Here, we describe two individuals, each with homozygous missense variants in ATP5F1D, who presented with episodic lethargy, metabolic acidosis, 3-methylglutaconic aciduria, and hyperammonemia. Subject 1, homozygous for c.245C>T (p.Pro82Leu), presented with recurrent metabolic decompensation starting in the neonatal period, and subject 2, homozygous for c.317T>G (p.Val106Gly), presented with acute encephalopathy in childhood. Cultured skin fibroblasts from these individuals exhibited impaired assembly of F1FO ATP synthase and subsequent reduced complex V activity. Cells from subject 1 also exhibited a significant decrease in mitochondrial cristae. Knockdown of Drosophila ATPsyn?, the ATP5F1D homolog, in developing eyes and brains caused a near complete loss of the fly head, a phenotype that was fully rescued by wild-type human ATP5F1D. In contrast, expression of the ATP5F1D c.245C>T and c.317T>G variants rescued the head-size phenotype but recapitulated the eye and antennae defects seen in other genetic models of mitochondrial oxidative phosphorylation deficiency. Our data establish c.245C>T (p.Pro82Leu) and c.317T>G (p.Val106Gly) in ATP5F1D as pathogenic variants leading to a Mendelian mitochondrial disease featuring episodic metabolic decompensation.

  View details for PubMedID 29478781

• Genetic Reduction in Left Ventricular Protein Kinase C-alpha and Adverse Ventricular Remodeling in Human Subjects CIRCULATION-CARDIOVASCULAR GENETICS Hu, R., Morley, M. P., Brandimarto, J., Tucker, N. R., Parsons, V. A., Zhao, S. D., Meder, B., Katus, H. A., Ruehle, F., Stoll, M., Villard, E., Cambien, F., Lin, H., Smith, N. L., Felix, J. F., Vasan, R. S., van der Harst, P., Newton-Cheh, C., Li, J., Kim, C. E., Hakonarson, H., Hannenhalli, S., Ashley, E. A., Moravec, C. S., Tang, W., Maillet, M., Molkentin, J. D., Ellinor, P. T., Margulies, K. B., Cappola, T. P. 2018; 11 (3): e001901

  Abstract

  Inhibition of PKC-? (protein kinase C-?) enhances contractility and cardioprotection in animal models, but effects in humans are unknown. Genotypes at rs9912468 strongly associate with PRKCA expression in the left ventricle, enabling genetic approaches to measure effects of reduced PKC-? in human populations.We analyzed the cis expression quantitative trait locus for PRKCA marked by rs9912468 using 313 left ventricular specimens from European Ancestry patients. The forward strand minor allele (G) at rs9912468 is associated with reduced PKC-? transcript abundance (1.7-fold reduction in minor allele homozygotes, P=1×10-41). This association was cardiac specific in expression quantitative trait locus data sets that span 16 human tissues. Cardiac epigenomic data revealed a predicted enhancer in complete (R2=1.0) linkage disequilibrium with rs9912468 within intron 2 of PRKCA. We cloned this region and used reporter constructs to verify cardiac-specific enhancer activity in vitro in cardiac and noncardiac cells and in vivo in zebrafish. The PRKCA enhancer contains 2 common genetic variants and 4 haplotypes; the haplotype correlated with the rs9912468 PKC-?-lowering allele (G) showed lowest activity. In contrast to previous reports in animal models, the PKC-?-lowering allele is associated with adverse left ventricular remodeling (higher mass, larger diastolic dimension), reduced fractional shortening, and higher risk of dilated cardiomyopathy in human populations.These findings support PKC-? as a regulator of the human heart but suggest that PKC-? inhibition may adversely affect the left ventricle depending on timing and duration. Pharmacological studies in human subjects are required to discern potential benefits and harms of PKC-? inhibitors as an approach to treat heart disease.

  View details for PubMedID 29540468

  View details for PubMedCentralID PMC5858599

• Ring Finger Protein 207 Degrades T613M Kv11.1 Channel Ledford, H. A., Park, S., Sirish, P., Xu, W., Emigh, A. M., Timofeyev, V., Priest, J. R., Perez, M. V., Ashley, E. A., Yarov-Yarovoy, V., Zhang, X., Chiamvimonvat, N. CELL PRESS. 2018: 625A

  View details for Web of Science ID 000430563300120

• A New Approach to Rare Diseases of Children: The Undiagnosed Diseases Network. The Journal of pediatrics Reuter, C. M., Brimble, E., DeFilippo, C., Dries, A. M., Enns, G. M., Ashley, E. A., Bernstein, J. A., Fisher, P. G., Wheeler, M. T. 2018

  View details for PubMedID 29331327

• What's in a Name? Factors That Influence the Usage of Generic Versus Trade Names for Cardiac Medications Among Healthcare Providers. Circulation. Cardiovascular quality and outcomes Ouyang, D., Tisdale, R., Cheng, P., Chi, J., Chen, J. H., Ashley, E. 2018; 11 (8): e004704

  View details for PubMedID 30354370

• PHACOMATOSIS PIGMENTOVASCULARIS: A CASE WITH SOMATIC MUTATION IN GNAQ AND ATYPICAL PHENOTYPIC FEATURES Kumar, A., Zastrow, D., Prybol, C., Manning, M., Huang, Y., Fisher, P., Ashley, E., Teng, J., Wheeler, M., Bernstein, J. BMJ PUBLISHING GROUP. 2018: 202

  View details for DOI 10.1136/jim-2017-000663.326

  View details for Web of Science ID 000432007400337

• Athletic Remodeling in Female College Athletes, the "Morganroth Hypothesis" Revisited. Clinical journal of sport medicine : official journal of the Canadian Academy of Sport Medicine Kooreman, Z., Giraldeau, G., Finocchiaro, G., Kobayashi, Y., Wheeler, M., Perez, M., Moneghetti, K., Oxborough, D., George, K. P., Myers, J., Ashley, E., Haddad, F. 2018

  Abstract

  There is limited data regarding ventricular remodeling in college female athletes, especially when appropriate scaling of cardiac dimensions to lean body mass (LBM) is considered. Moreover, it is not well established whether cardiac remodeling in female athletes is a balanced process with proportional increase in left ventricular (LV) mass and volume or the right and LV size.During the preparticipation competitive screening, 72 female college athletes volunteered to undergo dual energy x-ray absorptiometry scan for quantification of LBM and comprehensive 2D echocardiography including assessment of longitudinal myocardial strain. The athletes were divided in 2 groups according to the intensity of the dynamic and static components of their sport categories, ie, a higher intensity dynamic and resistive group (n = 37 participating in rowing, water polo and lacrosse) and a lower intensity group (n = 35, participating in short distance running, sailing, synchronized swimming, and softball). In addition, we recruited a group of 31 age-matched nonathlete controls.The mean age of the study population was 18.7 ± 1.0 years. When scaled to body surface area, the higher intensity group had 17.1 ± 3.6% (P < 0.001) greater LV mass when compared with the lower intensity group and 21.7 ± 4.0% (P < 0.001) greater LV mass than the control group. The differences persisted after scaling to LBM with 14.2 ± 3.2% (P < 0.001) greater LV mass in the higher intensity group. By contrast, there was no difference in any of the relative remodeling indices including the LV mass to volume ratio, right to LV area ratio, or left atrial to LV volume ratio (P > 0.50 for all). In addition, no significant difference was noted among the 3 groups in LV ejection fraction (P = 0.22), LV global longitudinal strain (P = 0.55), LV systolic strain rate (P = 0.62), or right ventricular global longitudinal strain (P = 0.61).Female collegiate athletes participating in higher intensity dynamic and resistive sports have higher indexed LV mass even when scaled to LBM. The remodeling process does however appear to be a balanced process not only at the intraventricular level but also at the interventricular and atrioventricular levels.

  View details for PubMedID 29369833

• A method for determining exercise oscillatory ventilation in heart failure: Prognostic value and practical implications INTERNATIONAL JOURNAL OF CARDIOLOGY Vainshelboim, B., Amin, A., Christle, J. W., Hebbal, S., Ashley, E. A., Myers, J. 2017; 249: 287?91

  Abstract

  Exercise oscillatory ventilation (EOV) has been shown to be a powerful prognostic marker in chronic heart failure (CHF). However, EOV is poorly defined, its measurement lacks standardization and it is underutilized in clinical practice. The purpose of this pilot study was to investigate the prognostic value of a modified definition of EOV in patients with CHF.Eighty-nine CHF patients (56.5±8.4years) (64% NYHA class III-IV) underwent cardiopulmonary exercise testing. EOV was defined as meeting all the following criteria: (1) ?3 consecutive cyclic fluctuations of ventilation during exercise; (2) average amplitude over 3 ventilatory oscillations ?5L; and (3) an average length of three oscillatory cycles 40s to 140s. Adverse cardiac events were tracked during 28±19months follow up. Cox proportional hazard analysis was used to determine the association between cardiac events and EOV.Forty-eight patients (54%) met all three criteria and were determined to have EOV. These patients exhibited significantly increased risk for adverse cardiac events [hazard ratio=2.2, 95% CI (1.2 to 4.1), p=0.011] compared to patients without EOV. After adjusting for age and established prognostic covariates (peak VO2 and VE/VCO2 slope), the modified EOV definition was the only significant variable in the multivariate model [hazard ratio=2.0, 95% CI (1.1 to 3.7), p=0.035].The proposed method for determining EOV was independently associated with increased risk for adverse cardiac events in CHF patients. While larger prospective studies are needed, this definition provides a relatively simple and more objective characterization of EOV, suggesting its potential application in clinical practice.

  View details for PubMedID 28918895

• Impact of Demographic Features, Lifestyle, and Comorbidities on the Clinical Expression of Hypertrophic Cardiomyopathy JOURNAL OF THE AMERICAN HEART ASSOCIATION Finocchiaro, G., Magavem, E., Sinagra, G., Ashley, E., Papadakis, M., Tome-Esteban, M., Sharma, S., Olivotto, I. 2017; 6 (12)

  View details for DOI 10.1161/JAHA.117.007161

  View details for Web of Science ID 000418951100047

• Load-dependent effects of apelin on murine cardiomyocytes PROGRESS IN BIOPHYSICS & MOLECULAR BIOLOGY Peyronnet, R., Bollensdorff, C., Capel, R. A., Rog-Zielinska, E. A., Woods, C. E., Charo, D. N., Lookin, O., Fajardo, G., Ho, M., Quertermous, T., Ashley, E. A., Kohl, P. 2017; 130: 333?43

  Abstract

  The apelin peptide is described as one of the most potent inotropic agents, produced endogenously in a wide range of cells, including cardiomyocytes. Despite positive effects on cardiac contractility in multicellular preparations, as well as indications of cardio-protective actions in several diseases, its effects and mechanisms of action at the cellular level are incompletely understood. Here, we report apelin effects on dynamic mechanical characteristics of single ventricular cardiomyocytes, isolated from mouse models (control, apelin-deficient [Apelin-KO], apelin-receptor KO mouse [APJ-KO]), and rat. Dynamic changes in maximal velocity of cell shortening and relaxation were monitored. In addition, more traditional indicators of inotropic effects, such as maximum shortening (in mechanically unloaded cells) or peak force development (in auxotonic contracting cells, preloaded using the carbon fibre technique) were studied. The key finding is that, using Apelin-KO cardiomyocytes exposed to different preloads with the 2-carbon fibre technique, we observe a lowering of the slope of the end-diastolic stress-length relation in response to 10 nM apelin, an effect that is preload-dependent. This suggests a positive lusitropic effect of apelin, which could explain earlier counter-intuitive findings on an apelin-induced increase in contractility occurring without matching rise in oxygen consumption.

  View details for PubMedID 28935153

• Mind the Gap: Current Challenges and Future State of Heart Failure Care CANADIAN JOURNAL OF CARDIOLOGY McDonald, M. A., Ashley, E. A., Fedak, P. M., Hawkins, N., Januzzi, J. L., McMurray, J. V., Parikh, V. N., Rao, V., Svystonyuk, D., Teerlink, J. R., Virani, S. 2017; 33 (11): 1434?49

  Abstract

  The past decade has seen many advances in the management of heart failure (HF) that have improved survival and quality of life for patients living with this condition. A number of gaps remain in our understanding of the pathophysiology of HF, and the application of emerging treatment strategies is an exciting but daunting challenge. It is possible that advances in genetic evaluation of cardiomyopathy will provide a more refined approach to characterizing HF syndromes, whereas large-scale clinical trials on the horizon should further clarify the role of novel pharmacologic agents and invasive therapies. Cardiac repair and regeneration hold great promise, but a number of pragmatic issues will limit clinical application in the near term. Replacing cardiac function with ventricular assist devices represents significant progress in the management of advanced disease; however, unacceptable rates of complications and costs need to be addressed before broader use in the general HF population is feasible. The ability to personalize care is limited, and the optimal model of disease management in the Canadian context remains uncertain. The emergence of biomarker-guided management and remote monitoring technologies might facilitate a more personalized approach to care in an effort to maintain health and stability and to prevent worsening HF. Ultimately, a greater understanding of how and when to intervene in the setting of acute HF should translate into improved outcomes for the highest-risk subgroup of patients. This review highlights key challenges in the management of HF and highlights the progress toward an ideal future state.

  View details for PubMedID 29111107

• Human Genome Sequencing at the Population Scale: A Primer on High-Throughput DNA Sequencing and Analysis AMERICAN JOURNAL OF EPIDEMIOLOGY Goldfeder, R. L., Wall, D. P., Khoury, M. J., Ioannidis, J. A., Ashley, E. A. 2017; 186 (8): 1000?1009

  Abstract

  Most human diseases have underlying genetic causes. To better understand the impact of genes on disease and its implications for medicine and public health, researchers have pursued methods for determining the sequences of individual genes, then all genes, and now complete human genomes. Massively parallel high-throughput sequencing technology, where DNA is sheared into smaller pieces, sequenced, and then computationally reordered and analyzed, enables fast and affordable sequencing of full human genomes. As the price of sequencing continues to decline, more and more individuals are having their genomes sequenced. This may facilitate better population-level disease subtyping and characterization, as well as individual-level diagnosis and personalized treatment and prevention plans. In this review, we describe several massively parallel high-throughput DNA sequencing technologies and their associated strengths, limitations, and error modes, with a focus on applications in epidemiologic research and precision medicine. We detail the methods used to computationally process and interpret sequence data to inform medical or preventative action.

  View details for DOI 10.1093/aje/kww224

  View details for Web of Science ID 000412798300013

  View details for PubMedID 29040395

• Care in Specialized Centers and Data Sharing Increase Agreement in Hypertrophic Cardiomyopathy Genetic Test Interpretation CIRCULATION-CARDIOVASCULAR GENETICS Furqan, A., Arscott, P., Girolami, F., Cirino, A. L., Michels, M., Day, S. M., Olivotto, I., Ho, C. Y., Ashley, E., Green, E. M., Caleshu, C., SHaRe Consortium 2017; 10 (5)

  Abstract

  Clinically impactful differences in the interpretation of genetic test results occur between laboratories and clinicians. To improve the classification of variants, a better understanding of why discrepancies occur and how they can be reduced is needed.We examined the frequency, causes, and resolution of discordant variant classifications in the Sarcomeric Human Cardiomyopathy Registry (SHaRe), a consortium of international centers with expertise in the clinical management and genetic architecture of hypertrophic cardiomyopathy. Of the 112 variants present in patients at >1 center, 23 had discordant classifications among centers (20.5%; Fleiss ?, 0.54). Discordance was more than twice as frequent among clinical laboratories in ClinVar, a public archive of variant classifications (315/695 variants; 45.2%; Fleiss ?, 0.30; P<0.001). Discordance in SHaRe most frequently occurred because hypertrophic cardiomyopathy centers had access to different privately held data when making their classifications (75.0%). Centers reassessed their classifications based on a comprehensive and current data summary, leading to reclassifications that reduced the discordance rate from 20.5% to 10.7%. Different interpretations of rarity and co-occurrence with pathogenic variants contributed to residual discordance.Discordance in variant classification among hypertrophic cardiomyopathy centers is largely attributable to privately held data. Some discrepancies are caused by differences in expert assessment of conflicting data. Discordance was markedly lower among centers specialized in hypertrophic cardiomyopathy than among clinical laboratories, suggesting that optimal genetic test interpretation occurs in the context of clinical care delivered by specialized centers with both clinical and genetics expertise.

  View details for PubMedID 28986452

• Report from the Annual Conference of the British Society of Echocardiography, November 2016, Queen Elizabeth II Conference Centre, London ECHO RESEARCH AND PRACTICE Steeds, R. P., Cowie, M. R., Rana, B. S., Chambers, J. B., Ray, S., Srinivasan, J., Schwarz, K., Neil, C. J., Scally, C., Horowitz, J. D., Frenneaux, M. P., Pislaru, C., Dawson, D. K., Rothwell, O. J., George, K., Somauroo, J. D., Lord, R., Stembridge, M., Shave, R., Hoffman, M., Ashley, E. A., Haddad, F., Eijsvogels, T. H., Oxborough, D., Hampson, R., Kinsey, C. D., Gurunathan, S., Vamvakidou, A., Karogiannis, N., Senior, R., Ahmadvazir, S., Shah, B. N., Zacharias, K., Bowen, D., Robinson, S., Ihekwaba, U., Parker, K., Boyd, J., Densem, C. G., Atkinson, C., Hinton, J., Gaisie, E. B., Rakhit, D. J., Yue, A. M., Roberts, P. R., Thomas, D., Phen, P., Sibley, J., Fergey, S., Russhard, P. 2017; 4 (3): M1?M16

  View details for DOI 10.1530/ERP-17-0046

  View details for Web of Science ID 000412136600009

• Navigating Genetic and Phenotypic Uncertainty in Left Ventricular Noncompaction CIRCULATION-CARDIOVASCULAR GENETICS Rhee, J., Grove, M. E., Ashley, E. A. 2017; 10 (4)

  View details for DOI 10.1161/CIRCGENETICS.117.001857

  View details for Web of Science ID 000407730600002

• A comparison of methods for determining the ventilatory threshold: implications for surgical risk stratification CANADIAN JOURNAL OF ANESTHESIA-JOURNAL CANADIEN D ANESTHESIE Vainshelboim, B., Rao, S., Chan, K., Lima, R. M., Ashley, E. A., Myers, J. 2017; 64 (6): 634-642

  Abstract

  The ventilatory threshold (VT) is an objective physiological marker of the capacity of aerobic endurance that has good prognostic applications in preoperative settings. Nevertheless, determining the VT can be challenging due to physiological and methodological issues, especially in evaluating surgical risk. The purpose of the current study was to compare different methods of determining VT and to highlight the implications for assessing perioperative risk.Our study entailed analysis of 445 treadmill cardiopulmonary exercise tests from 140 presurgical candidates with an aortic abdominal aneurysm (?3.0 to ?5.0 cm) and a mean (standard deviation [SD]) age of 72 (8) yr. We used three methods to determine the VT in 328 comparable tests, namely, self-detected metabolic system (MS), experts' visual (V) readings, and software using a log-log transformation (LLT) of ventilation vs oxygen uptake. Differences and agreement between the three methods were assessed using analysis of variance (ANOVA), coefficient of variation (CV), typical error limits of agreement (LoA), and interclass correlation coefficients (ICC).Overall, ANOVA revealed significant differences between the methods [MS = 14.1 (4.3) mLO2·kg(-1)·min(-1); V = 14.6 (4.4) mLO2·kg(-1)·min(-1); and LLT = 12.3 (3.3) mLO2·kg(-1)·min(-1); P < 0.001]. The assessment of agreement between methods provided the following results: ICC = 0.85; 95% confidence interval (CI), 0.82 to 0.87; P < 0.001; typical error, 2.1-2.8 mLO2·kg(-1)·min(-1); and, 95% LoA and CV ranged from 43 to 55% and 15.9 to 19.6%, respectively.The results show clinically significant variations between the methods and underscore the challenges of determining VT for perioperative risk stratification. The findings highlight the importance of meticulous evaluation of VT for predicting surgical outcomes. Future studies should address the prognostic perioperative utility of computed mathematical models combined with an expert's review. This trial was registered at ClinicalTrials.gov, identifier: NCT00349947.

  View details for DOI 10.1007/s12630-017-0862-8

  View details for Web of Science ID 000401518100009

  View details for PubMedID 28382529

• Accuracy in Wrist-Worn, Sensor-Based Measurements of Heart Rate and Energy Expenditure in a Diverse Cohort. Journal of personalized medicine Shcherbina, A., Mattsson, C. M., Waggott, D., Salisbury, H., Christle, J. W., Hastie, T., Wheeler, M. T., Ashley, E. A. 2017; 7 (2)

  Abstract

  The ability to measure physical activity through wrist-worn devices provides an opportunity for cardiovascular medicine. However, the accuracy of commercial devices is largely unknown. The aim of this work is to assess the accuracy of seven commercially available wrist-worn devices in estimating heart rate (HR) and energy expenditure (EE) and to propose a wearable sensor evaluation framework. We evaluated the Apple Watch, Basis Peak, Fitbit Surge, Microsoft Band, Mio Alpha 2, PulseOn, and Samsung Gear S2. Participants wore devices while being simultaneously assessed with continuous telemetry and indirect calorimetry while sitting, walking, running, and cycling. Sixty volunteers (29 male, 31 female, age 38 ± 11 years) of diverse age, height, weight, skin tone, and fitness level were selected. Error in HR and EE was computed for each subject/device/activity combination. Devices reported the lowest error for cycling and the highest for walking. Device error was higher for males, greater body mass index, darker skin tone, and walking. Six of the devices achieved a median error for HR below 5% during cycling. No device achieved an error in EE below 20 percent. The Apple Watch achieved the lowest overall error in both HR and EE, while the Samsung Gear S2 reported the highest. In conclusion, most wrist-worn devices adequately measure HR in laboratory-based activities, but poorly estimate EE, suggesting caution in the use of EE measurements as part of health improvement programs. We propose reference standards for the validation of consumer health devices (http://precision.stanford.edu/).

  View details for DOI 10.3390/jpm7020003

  View details for PubMedID 28538708

• Delivering Clinical Grade Sequencing and Genetic Test Interpretation for Cardiovascular Medicine. Circulation. Cardiovascular genetics Harper, A. R., Parikh, V. N., Goldfeder, R. L., Caleshu, C., Ashley, E. A. 2017; 10 (2)

  View details for DOI 10.1161/CIRCGENETICS.116.001221

  View details for PubMedID 28411191

• Max: Analysis from the Fitness Registry and the Importance of Exercise National Database (FRIEND Registry). Progress in cardiovascular diseases Myers, J., Kaminsky, L. A., Lima, R., Christle, J., Ashley, E., Arena, R. 2017

  Abstract

  Existing normal standards for maximal oxygen uptake (VO2 max) are problematic because they tend to be population specific, lack normal distribution and portability, and are poorly represented by women. The objective of the current study was to apply the Fitness Registry and the Importance of Exercise: A National Data Base (FRIEND) Registry to improve upon previous regression formulas for normal standards for VO2 max using treadmill testing. Maximal treadmill tests were performed in 7783 healthy men and women (20-79years; maximal RER >1.0) from the FRIEND registry and a separate validation cohort of 1287 subjects. A regression equation for VO2 max was derived from the FRIEND registry and compared to the validation cohort and two commonly used equations (Wasserman and European). Age, gender, and body weight were the only significant predictors of VO2 max (multiple R=0.79, R(2)=0.62, p<0.001). The equation for predicting VO2 max was: [Formula: see text] Marked differences were observed in percentage predicted VO2 max achieved between commonly used reference equations, particularly among women, overweight and obese subjects. In the validation sample, the FRIEND equation closely paralleled measured VO2 max, with the validation group yielding a percent predicted VO2 max of 100.4% based on the FRIEND equation. An equation for age-predicted VO2 max derived from the FRIEND registry provided a lower average error between measured and predicted VO2 max than traditional equations, and thus may provide a more suitable normal standard relative to traditional equations.

  View details for DOI 10.1016/j.pcad.2017.03.002

  View details for PubMedID 28377168

• Left atrial function and phenotypes in asymmetric hypertrophic cardiomyopathy. Echocardiography (Mount Kisco, N.Y.) Kobayashi, Y., Wheeler, M., Finocchiaro, G., Ariyama, M., Kobayashi, Y., Perez, M. V., Liang, D., Kuznetsova, T., Schnittger, I., Ashley, E., Haddad, F. 2017

  Abstract

  Few studies have analyzed changes in left atrial (LA) function associated with different phenotypes of asymmetric hypertrophic cardiomyopathy (HCM). We sought to demonstrate the association of impairments in LA function with disease phenotype in patients with obstructive and nonobstructive HCM.From Stanford Cardiomyopathy Registry, we randomly selected 50 age-/sex-matched healthy controls, 35 patients with nonobstructive HCM (HCM 1), 35 patients with obstructive HCM (HCM 2), and 35 patients with obstructive HCM requiring septal reduction therapy (HCM 3). Echocardiography was performed to evaluate left ventricular (LV) strain as well as LA function including LA emptying fraction and LA strain.The mean age was 51±14 years and 57% were male. LA volume index differed among all four predefined groups (25.6±6.7 mL/m(2) in controls, 32.2±13.3 mL/m(2) in HCM 1, 42.0±12.9 mL/m(2) in HCM 2, 52.4±15.2 mL/m(2) for HCM 3, and P<.05 all between groups). All measurement of LA function was impaired in patients with HCM than controls. Total and passive LA function was further impaired in HCM 2 or 3 compared with HCM 1, while active LA function was not different among the three groups. Among LV strains, only septal longitudinal strain differed among all groups (-18.5±1.9% in controls, -14.5±1.9% in HCM 1, -13.3±1.8% in HCM 2, -11.6±2.3% in HCM 3, and P<.05 all between groups).LA function was impaired in patients with HCM even in minimally symptomatic nonobstructive phenotype. Total and passive LA function was further impaired in patients with obstructive HCM.

  View details for DOI 10.1111/echo.13533

  View details for PubMedID 28370331

• INTERDISCIPLINARY PERIPARTUM CARE OF THE PATIENT WITH DIASTOLIC HEART FAILURE IN NON-OBSTRUCTIVE HYPERTROPHIC CARDIOMYOPATHY Beutner, K., Ashley, E., Wheeler, M., Parikh, V., Wheeler, L., Hoover, V., Platt, J., Salisbury, H., Johnson-Furlan, C., Nancy, R. ELSEVIER SCIENCE INC. 2017: 2118

  View details for Web of Science ID 000397342303040

• ADDRESSING REFERENCE ECHOCARDIOGRAPHIC PARAMETERS IN ATHLETIC SCREENING: A COLLEGE FOOTBALL-BASED STUDY FOCUSING ON THE IMPLICATIONS OF RACE AND CORRECTION FOR BODY COMPOSITION Moneghetti, K., Singh, T., Kooreman, Z., Christle, J., Froelicher, V., Wheeler, M., Ashley, E., Haddad, F. ELSEVIER SCIENCE INC. 2017: 1453

  View details for Web of Science ID 000397342302175

• SYSTOLIC DYSFUNCTION WITHOUT LV DILATATION IN A COHORT OF PATIENTS WITH LAMIN A/C CARDIOMYOPATHY Parikh, V., Amsallem, M., Haddad, F., Ashley, E., Wheeler, M. ELSEVIER SCIENCE INC. 2017: 846

  View details for Web of Science ID 000397342301368

• INTEGRATING MYOCARDIAL STRAIN AND EXERCISE PERFORMANCE INTO PROGNOSTICATION OF HYPERTROPHIC CARDIOMYOPATHY Moneghetti, K., Stolfo, D., Christle, J., Kobayashi, Y., Finocchiaro, G., Sinagra, G., Myers, J., Ashley, E., Haddad, F., Wheeler, M. ELSEVIER SCIENCE INC. 2017: 833

  View details for Web of Science ID 000397342301355

• IDENTIFYING THE OPTIMAL ECHOCARDIOGRAPHIC VARIABLES TO PREDICT OUTCOME THROUGH CORRELATION MAPPING IN PATIENTS WITH DILATED CARDIOMYOPATHY Moneghetti, K., Kim, J., Giraldeau, G., Kobayashi, Y., Boralkar, K., Schnittger, I., Ashley, E., Wheeler, M., Haddad, F. ELSEVIER SCIENCE INC. 2017: 1535

  View details for Web of Science ID 000397342302257

• Effect of lossy compression of quality scores on variant calling. Briefings in bioinformatics Ochoa, I., Hernaez, M., Goldfeder, R., Weissman, T., Ashley, E. 2017; 18 (2): 183-194

  Abstract

  Recent advancements in sequencing technology have led to a drastic reduction in genome sequencing costs. This development has generated an unprecedented amount of data that must be stored, processed, and communicated. To facilitate this effort, compression of genomic files has been proposed. Specifically, lossy compression of quality scores is emerging as a natural candidate for reducing the growing costs of storage. A main goal of performing DNA sequencing in population studies and clinical settings is to identify genetic variation. Though the field agrees that smaller files are advantageous, the cost of lossy compression, in terms of variant discovery, is unclear.Bioinformatic algorithms to identify SNPs and INDELs use base quality score information; here, we evaluate the effect of lossy compression of quality scores on SNP and INDEL detection. Specifically, we investigate how the output of the variant caller when using the original data differs from that obtained when quality scores are replaced by those generated by a lossy compressor. Using gold standard genomic datasets and simulated data, we are able to analyze how accurate the output of the variant calling is, both for the original data and that previously lossily compressed. We show that lossy compression can significantly alleviate the storage while maintaining variant calling performance comparable to that with the original data. Further, in some cases lossy compression can lead to variant calling performance that is superior to that using the original file. We envisage our findings and framework serving as a benchmark in future development and analyses of lossy genomic data compressors.

  View details for DOI 10.1093/bib/bbw011

  View details for PubMedID 26966283

• HapIso: An Accurate Method for the Haplotype-Specific Isoforms Reconstruction From Long Single-Molecule Reads IEEE TRANSACTIONS ON NANOBIOSCIENCE Mangul, S., Yang, T. (., Hormozdiari, F., Dainis, A. M., Tseng, E., Ashley, E. A., Zelikovsky, A., Eskin, E. 2017; 16 (2): 108-115

  Abstract

  Sequencing of RNA provides the possibility to study an individual's transcriptome landscape and determine allelic expression ratios. Single-molecule protocols generate multi-kilobase reads longer than most transcripts, allowing sequencing of complete haplotype isoforms. This allows partitioning the reads into two parental haplotypes. While the read length of the single-molecule protocols is long, the relatively high error rate limits the ability to accurately detect the genetic variants and assemble them into the haplotype-specific isoforms. In this paper, we present Haplotype-specific Isoform reconstruction (HapIso), a method able to tolerate the relatively high error rate of the single-molecule platform and partition the isoform reads into the parental alleles. Phasing the reads according to the allele of origin allows our method to efficiently distinguish between the read errors and the true biological mutations. HapIso uses a k -means clustering algorithm aiming to group the reads into two meaningful clusters maximizing the similarity of the reads within the cluster and minimizing the similarity of the reads from different clusters. Each cluster corresponds to a parental haplotype. We used the family pedigree information to evaluate our approach. Experimental validation suggests that HapIso is able to tolerate the relatively high error rate and accurately partition the reads into the parental alleles of the isoform transcripts. We also applied HapIso to novel clinical single-molecule RNA-Seq data to estimate allele-specific expression of genes of interest. Our method was able to correct reads and determine Glu1883Lys point mutation of clinical significance validated by GeneDx HCM panel. Furthermore, our method is the first method able to reconstruct the haplotype-specific isoforms from long single-molecule reads.

  View details for DOI 10.1109/TNB.2017.2675981

  View details for Web of Science ID 000399943600005

  View details for PubMedID 28328508

• Effect of lossy compression of quality scores on variant calling BRIEFINGS IN BIOINFORMATICS Ochoa, I., Hernaez, M., Goldfeder, R., Weissman, T., Ashley, E. 2017; 18 (2): 183-194

  Abstract

  Recent advancements in sequencing technology have led to a drastic reduction in genome sequencing costs. This development has generated an unprecedented amount of data that must be stored, processed, and communicated. To facilitate this effort, compression of genomic files has been proposed. Specifically, lossy compression of quality scores is emerging as a natural candidate for reducing the growing costs of storage. A main goal of performing DNA sequencing in population studies and clinical settings is to identify genetic variation. Though the field agrees that smaller files are advantageous, the cost of lossy compression, in terms of variant discovery, is unclear.Bioinformatic algorithms to identify SNPs and INDELs use base quality score information; here, we evaluate the effect of lossy compression of quality scores on SNP and INDEL detection. Specifically, we investigate how the output of the variant caller when using the original data differs from that obtained when quality scores are replaced by those generated by a lossy compressor. Using gold standard genomic datasets and simulated data, we are able to analyze how accurate the output of the variant calling is, both for the original data and that previously lossily compressed. We show that lossy compression can significantly alleviate the storage while maintaining variant calling performance comparable to that with the original data. Further, in some cases lossy compression can lead to variant calling performance that is superior to that using the original file. We envisage our findings and framework serving as a benchmark in future development and analyses of lossy genomic data compressors.

  View details for DOI 10.1093/bib/bbw011

  View details for Web of Science ID 000397060200002

• Orexin: a Missing Link Between Sleep Disorders and Heart Failure? Current heart failure reports Pan, S., Cabral, C. S., Ashley, E. A., Perez, M. V. 2017

  Abstract

  Sleep disorders represent a significant comorbidity in the heart failure population, and there is mounting evidence that treatment of sleep disorders such as obstructive sleep apnea can significantly improve cardiac function. However, the link between these two disorders is still not entirely clear.Recently, a novel neurohormonal pathway has been elucidated involving signaling molecules now collectively known as the orexins, which have been implicated in regulating autonomic function during sleep/wake cycles. Further evidence has mounted that orexin signaling is deeply perturbed in the setting of sleep disorders, and furthermore that abnormal orexin signaling may be implicated in the pathology of heart failure. The orexin signaling pathway represents an enticing novel target for both the treatment of sleep disorders as well as heart failure, and may represent one facet of the "missing link" between these two prevalent and often comorbid diseases.

  View details for DOI 10.1007/s11897-017-0322-3

  View details for PubMedID 28215031

• The Undiagnosed Diseases Network: Accelerating Discovery about Health and Disease AMERICAN JOURNAL OF HUMAN GENETICS Ramoni, R. B., Mulvihill, J. J., Adams, D. R., Allard, P., Ashley, E. A., Bernstein, J. A., Gahl, W. A., Hamid, R., Loscalzo, J., McCray, A. T., Shashi, V., Tifft, C. J., Wise, A. L. 2017; 100 (2): 185-192

  Abstract

  Diagnosis at the edges of our knowledge calls upon clinicians to be data driven, cross-disciplinary, and collaborative in unprecedented ways. Exact disease recognition, an element of the concept of precision in medicine, requires new infrastructure that spans geography, institutional boundaries, and the divide between clinical care and research. The National Institutes of Health (NIH) Common Fund supports the Undiagnosed Diseases Network (UDN) as an exemplar of this model of precise diagnosis. Its goals are to forge a strategy to accelerate the diagnosis of rare or previously unrecognized diseases, to improve recommendations for clinical management, and to advance research, especially into disease mechanisms. The network will achieve these objectives by evaluating patients with undiagnosed diseases, fostering a breadth of expert collaborations, determining best practices for translating the strategy into medical centers nationwide, and sharing findings, data, specimens, and approaches with the scientific and medical communities. Building the UDN has already brought insights to human and medical geneticists. The initial focus has been on data sharing, establishing common protocols for institutional review boards and data sharing, creating protocols for referring and evaluating patients, and providing DNA sequencing, metabolomic analysis, and functional studies in model organisms. By extending this precision diagnostic model nationally, we strive to meld clinical and research objectives, improve patient outcomes, and contribute to medical science.

  View details for DOI 10.1016/j.athg.2017.01.006

  View details for PubMedID 28157539

• Next-Generation Sequencing in Cardiovascular Disease Present Clinical Applications and the Horizon of Precision Medicine CIRCULATION Parikh, V. N., Ashley, E. A. 2017; 135 (5): 406?9

  View details for PubMedID 28137961

  View details for PubMedCentralID PMC5310819

• in a patient with a complex connective tissue phenotype. Cold Spring Harbor molecular case studies Zastrow, D. B., Zornio, P. A., Dries, A., Kohler, J., Fernandez, L., Waggott, D., Walkiewicz, M., Eng, C. M., Manning, M. A., Farrelly, E., Fisher, P. G., Ashley, E. A., Bernstein, J. A., Wheeler, M. T. 2017; 3 (1)

  Abstract

  Here we describe a patient who presented with a history of congenital diaphragmatic hernia, inguinal hernia, and recurrent umbilical hernia. She also has joint laxity, hypotonia, and dysmorphic features. A unifying diagnosis was not identified based on her clinical phenotype. As part of her evaluation through the Undiagnosed Diseases Network, trio whole-exome sequencing was performed. Pathogenic variants in FBN1 and TRPS1 were identified as causing two distinct autosomal dominant conditions, each with de novo inheritance. Fibrillin 1 (FBN1) mutations are associated with Marfan syndrome and a spectrum of similar phenotypes. TRPS1 mutations are associated with trichorhinophalangeal syndrome types I and III. Features of both conditions are evident in the patient reported here. Discrepant features of the conditions (e.g., stature) and the young age of the patient may have made a clinical diagnosis more difficult in the absence of exome-wide genetic testing.

  View details for DOI 10.1101/mcs.a001388

  View details for PubMedID 28050602

• Incremental value of right heart metrics and exercise performance to well-validated risk scores in dilated cardiomyopathy. European heart journal cardiovascular Imaging Moneghetti, K. J., Giraldeau, G., Wheeler, M. T., Kobayashi, Y., Vrtovec, B., Boulate, D., Kuznetsova, T., Schnittger, I., Wu, J. C., Myers, J., Ashley, E., Haddad, F. 2017

  Abstract

  Risk stratification in heart failure (HF) relies on several established clinical risk scores, however, myocardial deformation, right heart metrics, and exercise performance have not usually been considered. This study sought to assess the incremental value of advanced echocardiographic and cardiopulmonary exercise testing (CPX) parameters to validated risk scores in HF.The Meta-Analysis Global Group in Chronic Heart Failure (MAGGIC) and Metabolic Exercise Test Data Combined with Cardiac and Kidney Indexes (MECKI) scores were applied to 208 ambulatory patients with dilated cardiomyopathy (DCM) who completed echocardiography in conjunction with CPX as part of the Stanford Exercise Testing registry. Patients were followed for the composite end point of death, heart transplant, left ventricular device implantation, and hospitalization for acute HF. Mean age, left ventricular ejection fraction (LVEF), and left ventricular global longitudinal strain (LVGLS) were 47?±?13?years, 33?±?13%, and -10.6?±?4.4%, respectively, while right ventricular free-wall longitudinal strain was -18.8?±?5.5%. Partial correlation mapping identified strong correlations between LVEF, LVGLS, and LV systolic strain rate, with a moderate correlation between these metrics and peak VO2. Over a median follow up of 5.3?years, the composite end point occurred in 60 patients. Cox proportional hazards identified MAGGIC score [hazard ratio (HR) (2.04 [1.39-3.01], P?

  View details for PubMedID 28977353

• Navigating Genetic and Phenotypic Uncertainty in Left Ventricular Noncompaction. Circulation. Cardiovascular genetics Rhee, J. W., Grove, M. E., Ashley, E. A. 2017; 10 (4)

  View details for PubMedID 28798026

• Impact of Demographic Features, Lifestyle, and Comorbidities on the Clinical Expression of Hypertrophic Cardiomyopathy. Journal of the American Heart Association Finocchiaro, G., Magavern, E., Sinagra, G., Ashley, E., Papadakis, M., Tome-Esteban, M., Sharma, S., Olivotto, I. 2017; 6 (12)

  View details for PubMedID 29237589

• Report from the Annual Conference of the British Society of Echocardiography, November 2016, Queen Elizabeth II Conference Centre, London. Echo research and practice Steeds, R. P., Cowie, M. R., Rana, B. S., Chambers, J. B., Ray, S., Srinivasan, J., Schwarz, K., Neil, C. J., Scally, C., Horowitz, J. D., Frenneaux, M. P., Pislaru, C., Dawson, D. K., Rothwell, O. J., George, K., Somauroo, J. D., Lord, R., Stembridge, M., Shave, R., Hoffman, M., Ashley, E. A., Haddad, F., Eijsvogels, T. M., Oxborough, D., Hampson, R., Kinsey, C. D., Gurunathan, S., Vamvakidou, A., Karogiannis, N., Senior, R., Ahmadvazir, S., Shah, B. N., Zacharias, K., Bowen, D., Robinson, S., Ihekwaba, U., Parker, K., Boyd, J., Densem, C. G., Atkinson, C., Hinton, J., Gaisie, E. B., Rakhit, D. J., Yue, A. M., Roberts, P. R., Thomas, D., Phen, P., Sibley, J., Fergey, S., Russhard, P. 2017; 4 (3): M1

  View details for PubMedID 30390608

• Impact of a Genetic Risk Score for Coronary Artery Disease on Reducing Cardiovascular Risk: A Pilot Randomized Controlled Study. Frontiers in cardiovascular medicine Knowles, J. W., Zarafshar, S., Pavlovic, A., Goldstein, B. A., Tsai, S., Li, J., McConnell, M. V., Absher, D., Ashley, E. A., Kiernan, M., Ioannidis, J. P., Assimes, T. L. 2017; 4: 53

  Abstract

  We tested whether providing a genetic risk score (GRS) for coronary artery disease (CAD) would serve as a motivator to improve adherence to risk-reducing strategies.We randomized 94 participants with at least moderate risk of CAD to receive standard-of-care with (N?=?49) or without (N?=?45) their GRS at a subsequent 3-month follow-up visit. Our primary outcome was change in low density lipoprotein cholesterol (LDL-C) between the 3- and 6-month follow-up visits (?LDL-C). Secondary outcomes included other CAD risk factors, weight loss, diet, physical activity, risk perceptions, and psychological outcomes. In pre-specified analyses, we examined whether there was a greater motivational effect in participants with a higher GRS.Sixty-five participants completed the protocol including 30 participants in the GRS arm. We found no change in the primary outcome between participants receiving their GRS and standard-of-care participants (?LDL-C: -13 vs. -9?mg/dl). Among participants with a higher GRS, we observed modest effects on weight loss and physical activity. All other secondary outcomes were not significantly different, including anxiety and worry.Adding GRS to standard-of-care did not change lipids, adherence, or psychological outcomes. Potential modest benefits in weight loss and physical activity for participants with high GRS need to be validated in larger trials.

  View details for PubMedID 28856136

• Value of Strain Imaging and Maximal Oxygen Consumption in Patients With Hypertrophic Cardiomyopathy. The American journal of cardiology Moneghetti, K. J., Stolfo, D., Christle, J. W., Kobayashi, Y., Finocchiaro, G., Sinagra, G., Myers, J., Ashley, E. A., Haddad, F., Wheeler, M. T. 2017; 120 (7): 1203?8

  Abstract

  Longitudinal strain (LS) has been shown to be predictive of outcome in hypertrophic cardiomyopathy (HC). Percent predicted peak oxygen uptake (ppVO2), among other cardiopulmonary exercise testing (CPX) metrics, is a strong predictor of prognosis in HC. However, there has been limited investigation into the combination of LS and CPX metrics. This study sought to determine how LS and parameters of exercise performance contribute to prognosis in HC. One hundred and thirty-one consecutive patients with HC who underwent CPX and stress echocardiography were included. Global, septal, and lateral LS were assessed at rest and stress. Eighty matched individuals were used as controls. Patients were followed for the composite end point of death and worsening heart failure. All absolute LS components were lower in patients with HC than in controls (global 14.3?±?4.0% vs 18.8?±?2.2%, p <0.001; septal 11.9?±?4.9% vs 17.9?±?2.7%, p <0.001; lateral 16.0?±?4.7% vs 19.4?±?3.1%, p?=?0.001). Global strain reserve was also reduced in patients with HC (13?±?5% vs 19?±?8%, p?=?0.002). Over a median follow-up of 56 months (interquartile range 14 to 69), the composite end point occurred in 53 patients. Global LS was predictive of outcome on univariate analysis (0.55 [0.41 to 0.74], p <0.001). When combined with CPX metrics, lateral LS was the only strain variable predictive of outcome along with indexed left atrial volume (LAVI) and ppVO2. The worst outcomes were observed for patients with lateral LS <16.1%, LAVI >52?ml/m2, and ppVO2 <80%. The combination of lateral LS, LAVI, and ppVO2 presents a simple model for outcome prediction.

  View details for PubMedID 28802509

• A non-exercise based V02max prediction using FRIEND dataset with a Neural Network Henriques, J., Carvalho, P., Rocha, T., Paredes, S., Cabiddu, R., Trimer, R., Mendes, R., Borghi-Silva, A., Kaminsky, L., Ashley, E., Arena, R., Myers, J., IEEE IEEE. 2017: 4203?6

  Abstract

  The main goal of this work is the development of models, based on computational intelligence techniques, in particular neural networks, to predict the maximum oxygen consumption value. While the maximum oxygen consumption is a direct mark of the cardiorespiratory fitness, several studies have also confirmed it also as a powerful predictor of risk for adverse outcomes, such as hypertension, obesity, and diabetes. Therefore, the existence of simpler and accurate models, establishing an alternative to standard cardiopulmonary exercise tests, with the potential to be employed in the stratification of the general population in daily clinical practice, would be of major importance. In the current study, different models were implemented and compared: 1) the traditional Wasserman/Hansen equation; 2) linear regression and; 3) non-linear neural networks. Their performance was evaluated based on the "FRIEND - Fitness Registry and the Importance of Exercise: The National Data Base" [1] being, in the present study, a subset of 12262 individuals employed. The accuracy of the models was performed through the computation of sensitivity and specificity values. The results show the superiority of neural networks in the prediction of maximum oxygen consumption.

  View details for Web of Science ID 000427085304159

  View details for PubMedID 29060824

• Incremental value of right heart metrics and exercise performance to well-validated risk scores in dilated cardiomyopathy European Heart Journal - Cardiovascular Imaging Moneghetti , K. J., Giraldeau, G., Wheeler, M. T., Kobayashi , Y., Vrtovec, B., Boulate, D., Kuznetsova, T., Schnittger, I., Wu, J. C., Myers, J., Ashely, E., Haddad , F. 2017

  View details for DOI 10.1093/ehjci/jex187

• Contractile reserve and cardiopulmonary exercise parameters in patients with dilated cardiomyopathy, the two dimensions of exercise testing. Echocardiography (Mount Kisco, N.Y.) Moneghetti, K. J., Kobayashi, Y., Christle, J. W., Ariyama, M., Vrtovec, B., Kouznetsova, T., Wilson, A., Ashley, E., Wheeler, M. T., Myers, J., Haddad, F. 2017

  Abstract

  Left ventricular (LV) contractile reserve assessed using imaging and cardiopulmonary exercise testing (CPX) has been shown to predict outcome in patients with dilated cardiomyopathy (DCM). Few clinical studies have, however, analyzed the relationship between them.A cohort of 75 ambulatory patients with DCM underwent stress treadmill echocardiography with CPX. LV contractile reserve was calculated as absolute change (?LVEF=LVEFpeak -LVEFrest ) and percent change (%LVEF=[(LVEFpeak -LVEFrest )/LVEFpeak) ]×100) in LVEF, circumferential and longitudinal strain (LS). Exercise capacity was measured as peak oxygen uptake (peak VO2 ) and ventilatory efficiency as the slope of minute ventilation to CO2 production (VE/VCO2 slope). Values of contractile reserve were compared to matched controls. We also explored which metric of ventricular response (absolute or percent change) was less dependent on baseline LV function.Patients with DCM had a mean age, rest and peak LVEF of 44±10 years, 42±10% and 50±12%, respectively. Among parameters of contractile reserve, peak cardiac output was the strongest parameter associated with peak VO2 (r=.63, P<.001). Along with age, sex, and BMI, it explained more than 70% of the variance in peak VO2 . In contrast, LVEF and LS were only weakly related to peak VO2 . With regard to ventilatory efficiency, the strongest parameter that emerged was right atrial volume index (r=.36, P<.001). Percent change in LVEF was more independent of baseline function than absolute change.Echocardiographic contractile reserve and CPX provide complementary information. Percent change in contractile reserve was most independent of baseline function, therefore may be preferred when analyzing the ventricular response to exercise.

  View details for PubMedID 28681553

• Informed Consent. New England journal of medicine Grady, C., Cummings, S. R., Rowbotham, M. C., McConnell, M. V., Ashley, E. A., Kang, G. 2017; 376 (9): 856-867

  View details for DOI 10.1056/NEJMra1603773

  View details for PubMedID 28249147

• Functional assessment and transplantation of the donor heart after circulatory death JOURNAL OF HEART AND LUNG TRANSPLANTATION Messer, S. J., Axell, R. G., Colah, S., White, P. A., Ryan, M., Page, A. A., Parizkova, B., Valchanov, K., White, C. W., Freed, D. H., Ashley, E., Dunning, J., Goddard, M., Parameshwar, J., Watson, C. J., Krieg, T., Ali, A., Tsui, S., Large, S. R. 2016; 35 (12): 1443-1452

  Abstract

  After a severe shortage of brain-dead donors, the demand for heart transplantation has never been greater. In an attempt to increase organ supply, abdominal and lung transplant programs have turned to the donation after circulatory-determined death (DCD) donor. However, because heart function cannot be assessed after circulatory death, DCD heart transplantation was deemed high risk and never adopted routinely. We report a novel method of functional assessment of the DCD heart resulting in a successful clinical program.Normothermic regional perfusion (NRP) was used to restore function to the arrested DCD heart within the donor after exclusion of the cerebral circulation. After weaning from support, DCD hearts underwent functional assessment with cardiac-output studies, echocardiography, and pressure-volume loops. In the feasibility phase, hearts were transported perfused before evaluation of function in modified working mode extracorporeally. After the establishment of a reliable assessment technique, hearts with demonstrable good function were then selected for clinical transplantation.NRP was instituted in 13 adult DCD donors, median age of 33 years (interquartile range [IQR], 28-38 years), after a median ischemic time from withdrawal to perfusion of 24 minutes (IQR, 21-29; range, 17-146 minutes). Two of 4 hearts in the feasibility phase were unsuitable for transplantation after functional assessment. Nine DCD hearts were transplanted in the clinical phase, with 100% survival. The median intensive care duration was 5 days (IQR, 4-5 days), with 2 patients requiring mechanical support. There were no episodes of rejection (total, 1,436 patient-days; range, 48-297). During the same period, we performed 20 standard heart transplants using brain-dead donors.NRP allows rapid reperfusion and functional assessment of the DCD donor heart, ensuring only viable hearts are selected for transplantation. This technique minimizes the risk of primary graft dysfunction and maximizes confidence in DCD heart transplantation, realizing a 45% increase in our heart transplant activity.

  View details for DOI 10.1016/j.healun.2016.07.004

  View details for PubMedID 27916176

• Deep Learning Automates the Quantitative Analysis of Individual Cells in Live-Cell Imaging Experiments. PLoS computational biology Van Valen, D. A., Kudo, T., Lane, K. M., Macklin, D. N., Quach, N. T., DeFelice, M. M., Maayan, I., Tanouchi, Y., Ashley, E. A., Covert, M. W. 2016; 12 (11)

  Abstract

  Live-cell imaging has opened an exciting window into the role cellular heterogeneity plays in dynamic, living systems. A major critical challenge for this class of experiments is the problem of image segmentation, or determining which parts of a microscope image correspond to which individual cells. Current approaches require many hours of manual curation and depend on approaches that are difficult to share between labs. They are also unable to robustly segment the cytoplasms of mammalian cells. Here, we show that deep convolutional neural networks, a supervised machine learning method, can solve this challenge for multiple cell types across the domains of life. We demonstrate that this approach can robustly segment fluorescent images of cell nuclei as well as phase images of the cytoplasms of individual bacterial and mammalian cells from phase contrast images without the need for a fluorescent cytoplasmic marker. These networks also enable the simultaneous segmentation and identification of different mammalian cell types grown in co-culture. A quantitative comparison with prior methods demonstrates that convolutional neural networks have improved accuracy and lead to a significant reduction in curation time. We relay our experience in designing and optimizing deep convolutional neural networks for this task and outline several design rules that we found led to robust performance. We conclude that deep convolutional neural networks are an accurate method that require less curation time, are generalizable to a multiplicity of cell types, from bacteria to mammalian cells, and expand live-cell imaging capabilities to include multi-cell type systems.

  View details for DOI 10.1371/journal.pcbi.1005177

  View details for PubMedID 27814364

  View details for PubMedCentralID PMC5096676

• Exploratory insights from the right-sided electrocardiogram following prolonged endurance exercise. European journal of sport science Lord, R., George, K., Somauroo, J., Jain, N., Reese, K., Hoffman, M. D., Haddad, F., Ashley, E., Jones, H., Oxborough, D. 2016; 16 (8): 1014-1022

  Abstract

  Prolonged strenuous exercise has a profound effect on cardiac function. The right heart may be more susceptible to this imposition; yet, right-sided chest leads have not been utilised in this setting.Thirty highly trained athletes at the 2014 Western States 100-mile Endurance Run from Squaw Valley to Auburn, California (body mass 68?±?12?kg, age 45?±?10?years, 57?±?15?miles per week) were recruited for the study. Pre- and post-race, a right-sided 12-lead ECG was obtained and data were extracted for P, R and S waves, J point, ST segment and T wave amplitude. Data were compared using Students T-test and statistical significance set as P?

  View details for DOI 10.1080/17461391.2016.1165292

  View details for PubMedID 27027796

• Interdisciplinary psychosocial care for families with inherited cardiovascular diseases. Trends in cardiovascular medicine Caleshu, C., Kasparian, N. A., Edwards, K. S., Yeates, L., Semsarian, C., Perez, M., Ashley, E., Turner, C. J., Knowles, J. W., Ingles, J. 2016; 26 (7): 647-653

  Abstract

  Inherited cardiovascular diseases pose unique and complex psychosocial challenges for families, including coming to terms with life-long cardiac disease, risk of sudden death, grief related to the sudden death of a loved one, activity restrictions, and inheritance risk to other family members. Psychosocial factors impact not only mental health but also physical health and cooperation with clinical recommendations. We describe an interdisciplinary approach to the care of families with inherited cardiovascular disease, in which psychological care provided by specialized cardiac genetic counselors, nurses, and psychologists is embedded within the cardiovascular care team. We report illustrative cases and the supporting literature to demonstrate common scenarios, as well as practical guidance for clinicians working in the inherited cardiovascular disease setting.

  View details for DOI 10.1016/j.tcm.2016.04.010

  View details for PubMedID 27256036

• In Vivo Post-Cardiac Arrest Myocardial Dysfunction Is Supported by Ca2+/Calmodulin-Dependent Protein Kinase II-Mediated Calcium Long-Term Potentiation and Mitigated by Alda-1, an Agonist of Aldehyde Dehydrogenase Type 2. Circulation Woods, C. E., Shang, C., Taghavi, F., Downey, P., Zalewski, A., Rubio, G. R., Liu, J., Homburger, J. R., Grunwald, Z., Qi, W., Bollensdorff, C., Thanaporn, P., Ali, A., Riemer, R. K., Kohl, P., Mochly-Rosen, D., Gerstenfeld, E., Large, S., Ali, Z. A., Ashley, E. A. 2016; 134 (13): 961-977

  Abstract

  Survival after sudden cardiac arrest is limited by postarrest myocardial dysfunction, but understanding of this phenomenon is constrained by a lack of data from a physiological model of disease. In this study, we established an in vivo model of cardiac arrest and resuscitation, characterized the biology of the associated myocardial dysfunction, and tested novel therapeutic strategies.We developed rodent models of in vivo postarrest myocardial dysfunction using extracorporeal membrane oxygenation resuscitation followed by invasive hemodynamics measurement. In postarrest isolated cardiomyocytes, we assessed mechanical load and Ca(2) (+)-induced Ca(2+) release (CICR) simultaneously using the microcarbon fiber technique and observed reduced function and myofilament calcium sensitivity. We used a novel fiberoptic catheter imaging system and a genetically encoded calcium sensor, GCaMP6f, to image CICR in vivo.We found potentiation of CICR in isolated cells from this extracorporeal membrane oxygenation model and in cells isolated from an ischemia/reperfusion Langendorff model perfused with oxygenated blood from an arrested animal but not when reperfused in saline. We established that CICR potentiation begins in vivo. The augmented CICR observed after arrest was mediated by the activation of Ca(2+)/calmodulin-dependent protein kinase II (CaMKII). Increased phosphorylation of CaMKII, phospholamban, and ryanodine receptor 2 was detected in the postarrest period. Exogenous adrenergic activation in vivo recapitulated Ca(2+) potentiation but was associated with lesser CaMKII activation. Because oxidative stress and aldehydic adduct formation were high after arrest, we tested a small-molecule activator of aldehyde dehydrogenase type 2, Alda-1, which reduced oxidative stress, restored calcium and CaMKII homeostasis, and improved cardiac function and postarrest outcome in vivo.Cardiac arrest and reperfusion lead to CaMKII activation and calcium long-term potentiation, which support cardiomyocyte contractility in the face of impaired postarrest myofilament calcium sensitivity. Alda-1 mitigates these effects, normalizes calcium cycling, and improves outcome.

  View details for DOI 10.1161/CIRCULATIONAHA.116.021618

  View details for PubMedID 27582424

• Alterations in Cardiac Mechanics Following Ultra-Endurance Exercise: Insights from Left and Right Ventricular Area-Deformation Loops. Journal of the American Society of Echocardiography Lord, R., George, K., Somauroo, J., Stembridge, M., Jain, N., Hoffman, M. D., Shave, R., Haddad, F., Ashley, E., Jones, H., Oxborough, D. 2016; 29 (9): 879-887 e1

  Abstract

  The aim of this study was to use novel area-deformation (?) loops to interrogate the interaction between the right ventricular (RV) and left ventricular (LV) mechanics following a 100-mile endurance run.Fifteen participants (mean body mass, 70.1 ± 8.8 kg; mean age, 40 ± 8 years) were recruited for the study. Echocardiography was performed before the race, after the race, and 6 hours into recovery. RV and LV area and longitudinal ? were assessed using standard and speckle-tracking echocardiography. Following cubic spline interpolation, these variables were obtained across the same cardiac cycle and used to derive area-? loops.The RV area-? loop demonstrated a rightward shift after the race, with increased RV area (from 26.0 to 27.1 cm(2)) and reduced peak RV ? (from -28.6% to -25.8%). The recovery RV area-? loop was similar to the postrace loop. A leftward shift was observed in the LV area-? loop after the race, secondary to reduced LV area (from 35.8 to 32.5 cm(2)) and reduced peak ? (from -18.3% to -16.6%). In recovery, LV ? values returned toward baseline.A 100-mile ultramarathon resulted in a rightward shift in the RV area-? loop as a result of RV dilatation. There was a concomitant leftward shift in the LV area-? loop as a result of underfilling of the left ventricle. At 6 hours after exercise, there was a partial recovery of the left ventricle, while RV function remained depressed. It appears that changes in RV function do not have a serial impact on the left ventricle during recovery from ultra-endurance activity.

  View details for DOI 10.1016/j.echo.2016.05.004

  View details for PubMedID 27373587

• Whole exome sequencing of a Finnish HLHS cohort reveals new variants in known LVOTO related genes and identifies new candidate genes Helle, E., Ojala, T., Ashley, E., Priest, J. R. OXFORD UNIV PRESS. 2016: 1036

  View details for Web of Science ID 000383869505155

• Phase 2 study of A797, an oral, selective p38 mitogen-activated protein kinase inhibitor, in patients with lamin A/C-related dilated cardiomyopathy MacRae, C., Taylor, M. G., Mestroni, L., Moses, J. R., Ashley, E. A., Wheeler, M. T., Lakdawala, N. K., Hershberger, R. E., Ptaszynski, M., Sandor, V., Saunders, M. E., Oliver, C., Lee, P. A., Judge, D. P. OXFORD UNIV PRESS. 2016: 1011

  View details for Web of Science ID 000383869505075

• Taming the genome: towards better genetic test interpretation GENOME MEDICINE Caleshu, C., Ashley, E. A. 2016; 8

  Abstract

  Advances in sequencing technology have taught us much about the human genome, including how difficult it is to interpret rare variation. Improvements in genetic test interpretation are likely to come through data sharing, international collaborative efforts to develop disease-gene specific guidelines, and computational analyses using big data.

  View details for DOI 10.1186/s13073-016-0325-9

  View details for Web of Science ID 000378592700002

  View details for PubMedID 27324065

  View details for PubMedCentralID PMC4915179

• The Undiagnosed Diseases Program Reply JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION Gahl, W. A., Wise, A. L., Ashley, E. A. 2016; 315 (17): 1904

  View details for PubMedID 27139070

• Hypertrophic Cardiomyopathy as a Cause of Sudden Cardiac Death in the Young: A Meta-Analysis AMERICAN JOURNAL OF MEDICINE Ullal, A. J., Abdelfattah, R. S., Ashley, E. A., Froelicher, V. F. 2016; 129 (5): 486-?

  Abstract

  Sudden cardiac death is often linked with hypertrophic cardiomyopathy in young athletes, but with a divergence of study results. We performed a meta-analysis to compare the prevalence of sudden cardiac deaths associated with hypertrophic cardiomyopathy vs sudden cardiac deaths associated with structurally normal hearts.A structured search of MEDLINE was conducted for studies published from 1990 through 2014. Retrospective cohort studies, patient registries, and autopsy series examining sudden cardiac death etiology in young individuals (age ?35 years) were included. A random-effects model was applied to generate pooled summary estimates of the percentage of sudden cardiac deaths with structurally normal hearts at postmortem vs those caused by hypertrophic cardiomyopathy. Heterogeneity was assessed using I(2). Subgroup analyses were conducted based on study location, patient age groups, and population types.Thirty-four studies were included, representing a combined sample of 4605 subjects. The overall pooled percentage of sudden cardiac deaths caused by hypertrophic cardiomyopathy was 10.3% (95% confidence interval [CI], 8.0%-12.6%; I(2) = 87.2%), while sudden cardiac deaths with structurally normal hearts at death were more common (P <.001) at 26.7% (95% CI, 21.0%-32.3%; I(2) = 95.3%). In nonathlete subjects, the pooled percentage of sudden cardiac deaths associated with structurally normal hearts (30.7%; 95% CI, 23.0%-38.4%; I(2) = 96.3%) were significantly more common (P <.001) than sudden cardiac death caused by hypertrophic cardiomyopathy (7.8%; 95% CI, 5.8%-9.9%; I(2) = 80.1%). Among athletes, there was no significant difference between summary estimates of hypertrophic cardiomyopathy and structurally normal hearts (P = .57), except in Europe where structurally normal hearts were more common (P = .01).Hypertrophic cardiomyopathy is not a more common finding at death than structurally normal hearts in young subjects with sudden cardiac death. Increased attention should be directed toward identifying causes of death associated with a structurally normal heart in subjects with sudden cardiac death.

  View details for DOI 10.1016/j.amjmed.2015.12.027

  View details for PubMedID 26800575

• Impact of Septal Reduction on Left Atrial Size and Diastole in Hypertrophic Cardiomyopathy ECHOCARDIOGRAPHY-A JOURNAL OF CARDIOVASCULAR ULTRASOUND AND ALLIED TECHNIQUES Finocchiaro, G., Haddad, F., Kobayashi, Y., Lee, D., Pavlovic, A., Schnittger, I., Sinagra, G., Magavern, E., Myers, J., Froelicher, V., Knowles, J. W., Ashley, E. 2016; 33 (5): 686-694

  Abstract

  Both myectomy and alcohol septal ablation (ASA) can substantially reduce left ventricular (LV) outflow obstruction, relieve symptoms, and improve outcomes in hypertrophic cardiomyopathy (HCM). It is unclear whether septal reduction decreases left atrial (LA) size and improves diastolic function. The aim of this study was to analyze the consequences of septal reduction on LA size and diastolic function in a cohort of patients with HCM.Forty patients (mean age: 50 ± 14, male sex 64%) with HCM who underwent septal reduction (myectomy or alcohol septal ablation) were studied. Retrospective analyses of echocardiograms preprocedure, postprocedure, and at 1 year of follow-up were performed.Thirty-one patients had septal myectomy and 9 ASA. The degree of reduction in rest peak LV outflow tract gradient was significant (57 ± 32 vs. 23 ± 20 mmHg at 1 year, P < 0.001). Maximal interventricular septal thickness decreased from 22 ± 6 mm preprocedure to 19 ± 4 mm postprocedure (P < 0.001); moderate-to-severe mitral regurgitation (MR) was initially present in 34% of the sample and only 2% after the procedure. Average LA volume index (LAVI) decreased from 63 ± 20 to 55 ± 20 mL/m(2) at the 1-year follow-up (P < 0.001). We did not observe a significant improvement in diastolic function at Doppler (E/A 1.2 ± 0.4 vs. 1.1 ± 0.5, P = 0.07; E' 7.6 ± 3.6 vs. 6.9 ± 3.0, P = 0.4) pre- and postprocedure, respectively). At 1 year, only 5% of the patients were severely symptomatic (NYHA III). On multivariate analysis, a significant change in the LVOT gradient during stress (? gradient ?30 mmHg) was the only variable independently associated with LAVI reverse remodeling >10 mL/m(2) [OR = 6.4 (CI 95% 1.12-36.44), P = 0.04].Septal reduction is effective in the relief of LV obstruction and symptoms in patients with HCM. The hemodynamic changes result in a significant LA reverse remodeling, but not in an improvement of diastolic function in these patients.

  View details for DOI 10.1111/echo.13158

  View details for PubMedID 26926154

• A research roadmap for next-generation sequencing informatics SCIENCE TRANSLATIONAL MEDICINE Altman, R. B., Prabhu, S., Sidow, A., Zook, J. M., Goldfeder, R., Litwack, D., Ashley, E., Asimenos, G., Bustamante, C. D., Donigan, K., Giacomini, K. M., Johansen, E., Khuri, N., Lee, E., Liang, X. S., Salit, M., Serang, O., Tezak, Z., Wall, D. P., Mansfield, E., Kass-Hout, T. 2016; 8 (335)

  Abstract

  Next-generation sequencing technologies are fueling a wave of new diagnostic tests. Progress on a key set of nine research challenge areas will help generate the knowledge required to advance effectively these diagnostics to the clinic.

  View details for DOI 10.1126/scitranslmed.aaf7314

  View details for PubMedID 27099173

• De Novo and Rare Variants at Multiple Loci Support the Oligogenic Origins of Atrioventricular Septal Heart Defects. PLoS genetics Priest, J. R., Osoegawa, K., Mohammed, N., Nanda, V., Kundu, R., Schultz, K., Lammer, E. J., Girirajan, S., Scheetz, T., Waggott, D., Haddad, F., Reddy, S., Bernstein, D., Burns, T., Steimle, J. D., Yang, X. H., Moskowitz, I. P., Hurles, M., Lifton, R. P., Nickerson, D., Bamshad, M., Eichler, E. E., Mital, S., Sheffield, V., Quertermous, T., Gelb, B. D., Portman, M., Ashley, E. A. 2016; 12 (4)

  Abstract

  Congenital heart disease (CHD) has a complex genetic etiology, and recent studies suggest that high penetrance de novo mutations may account for only a small fraction of disease. In a multi-institutional cohort surveyed by exome sequencing, combining analysis of 987 individuals (discovery cohort of 59 affected trios and 59 control trios, and a replication cohort of 100 affected singletons and 533 unaffected singletons) we observe variation at novel and known loci related to a specific cardiac malformation the atrioventricular septal defect (AVSD). In a primary analysis, by combining developmental coexpression networks with inheritance modeling, we identify a de novo mutation in the DNA binding domain of NR1D2 (p.R175W). We show that p.R175W changes the transcriptional activity of Nr1d2 using an in vitro transactivation model in HUVEC cells. Finally, we demonstrate previously unrecognized cardiovascular malformations in the Nr1d2tm1-Dgen knockout mouse. In secondary analyses we map genetic variation to protein-interaction networks suggesting a role for two collagen genes in AVSD, which we corroborate by burden testing in a second replication cohort of 100 AVSDs and 533 controls (p = 8.37e-08). Finally, we apply a rare-disease inheritance model to identify variation in genes previously associated with CHD (ZFPM2, NSD1, NOTCH1, VCAN, and MYH6), cardiac malformations in mouse models (ADAM17, CHRD, IFT140, PTPRJ, RYR1 and ATE1), and hypomorphic alleles of genes causing syndromic CHD (EHMT1, SRCAP, BBS2, NOTCH2, and KMT2D) in 14 of 59 trios, greatly exceeding variation in control trios without CHD (p = 9.60e-06). In total, 32% of trios carried at least one putatively disease-associated variant across 19 loci,suggesting that inherited and de novo variation across a heterogeneous group of loci may contribute to disease risk.

  View details for DOI 10.1371/journal.pgen.1005963

  View details for PubMedID 27058611

• Comparison of left ventricular manual versus automated derived longitudinal strain: implications for clinical practice and research INTERNATIONAL JOURNAL OF CARDIOVASCULAR IMAGING Kobayashi, Y., Ariyama, M., Kobayashi, Y., Giraldeau, G., Fleischman, D., Kozelj, M., Vrtovec, B., Ashley, E., Kuznetsova, T., Schnittger, I., Liang, D., Haddad, F. 2016; 32 (3): 429-437

  Abstract

  Systolic global longitudinal strain (GLS) is emerging as a useful metric of ventricular function in heart failure and usually assessed using post-processing software. The purpose of this study was to investigate whether longitudinal strain (LS) derived using manual-tracings of ventricular lengths (manual-LS) can be reliable and time efficient when compared to LS obtained by post-processing software (software-LS). Apical 4-chamber view images were retrospectively examined in 50 healthy controls, 100 patients with dilated cardiomyopathy (DCM), and 100 with hypertrophic cardiomyopathy (HCM). We measured endocardial and mid-wall manual-LS and software-LS, using peak of average regional curve [software-LS(a)] and global ventricular lengths [software-LS(l)] according to definition of Lagragian strain. We compared manual-LS and software-LS by using Bland-Altman plot and coefficient of variation (COV). In addition, test-retest was also performed for further assessment of variability in measurements. While manual-LS was obtained in all subjects, software-LS could be obtained in 238 subjects (95 %). The time spent for obtaining manual-LS was significantly shorter than for the software-LS (94 ± 39 s vs. 141 ± 79 s, P < 0.001). Overall, manual-LS had an excellent correlation with both software-LS (a) (R(2) = 0.93, P < 0.001) and software-LS(l) (R(2) = 0.84, P < 0.001). The bias (95 %CI) between endocardial manual-LS and software-LS(a) was 0.4 % [-2.8, 3.6 %] in absolute and 3.5 % [-17.0, 24.0 %] in relative difference while it was 0.4 % [-2.5, 3.3 %] and 3.4 % [-16.2, 23.1 %], respectively with software-LS(l). Mid-wall manual-LS and mid-wall software-LS(a) also had good agreement [a bias (95 % CI) for absolute value of 0.1 % [-2.1, 2.5 %] in HCM, and 0.2 % [-2.2, 2.6 %] in controls]. The COV for manual and software derived LS were below 6 %. Test-retest showed good variability for both methods (COVs were 5.8 and 4.7 for endocardial and mid-wall manual-LS, and 4.6 and 4.9 for endocardial and mid-wall software-LS(a), respectively. Manual-LS appears to be as reproducible as software-LS; this may be of value especially when global strain is the metric of interest.

  View details for DOI 10.1007/s10554-015-0804-x

  View details for Web of Science ID 000370166100008

  View details for PubMedID 26578468

• Sports genetics moving forward: lessons learned from medical research. Physiological genomics Mattsson, C. M., Wheeler, M. T., Waggott, D., Caleshu, C., Ashley, E. A. 2016; 48 (3): 175-182

  Abstract

  Sports genetics can take advantage of lessons learned from human disease genetics. By righting past mistakes and increasing scientific rigor, we can magnify the breadth and depth of knowledge in the field. We present an outline of challenges facing sports genetics in the light of experiences from medical research. Sports performance is complex, resulting from a combination of a wide variety of different traits and attributes. Improving sports genetics will foremost require analyses based on detailed phenotyping. To find widely valid, reproducible common variants associated with athletic phenotypes, study sample sizes must be dramatically increased. One paradox is that in order to confirm relevance, replications in specific populations must be undertaken. Family studies of athletes may facilitate the discovery of rare variants with large effects on athletic phenotypes. The complexity of the human genome, combined with the complexity of athletic phenotypes, will require additional metadata and biological validation to identify a comprehensive set of genes involved. Analysis of personal genetic and multiomic profiles contribute to our conceptualization of precision medicine; the same will be the case in precision sports science. In the refinement of sports genetics it is essential to evaluate similarities and differences between sexes and among ethnicities. Sports genetics to date have been hampered by small sample sizes and biased methodology, which can lead to erroneous associations and overestimation of effect sizes. Consequently, currently available genetic tests based on these inherently limited data cannot predict athletic performance with any accuracy.

  View details for DOI 10.1152/physiolgenomics.00109.2015

  View details for PubMedID 26757801

• Athlome Project Consortium: a concerted effort to discover genomic and other "omic" markers of athletic performance. Physiological genomics Pitsiladis, Y. P., Tanaka, M., Eynon, N., Bouchard, C., North, K. N., Williams, A. G., Collins, M., Moran, C. N., Britton, S. L., Fuku, N., Ashley, E. A., Klissouras, V., Lucia, A., Ahmetov, I. I., de Geus, E., Alsayrafi, M. 2016; 48 (3): 183-190

  Abstract

  Despite numerous attempts to discover genetic variants associated with elite athletic performance, injury predisposition, and elite/world-class athletic status, there has been limited progress to date. Past reliance on candidate gene studies predominantly focusing on genotyping a limited number of single nucleotide polymorphisms or the insertion/deletion variants in small, often heterogeneous cohorts (i.e., made up of athletes of quite different sport specialties) have not generated the kind of results that could offer solid opportunities to bridge the gap between basic research in exercise sciences and deliverables in biomedicine. A retrospective view of genetic association studies with complex disease traits indicates that transition to hypothesis-free genome-wide approaches will be more fruitful. In studies of complex disease, it is well recognized that the magnitude of genetic association is often smaller than initially anticipated, and, as such, large sample sizes are required to identify the gene effects robustly. A symposium was held in Athens and on the Greek island of Santorini from 14-17 May 2015 to review the main findings in exercise genetics and genomics and to explore promising trends and possibilities. The symposium also offered a forum for the development of a position stand (the Santorini Declaration). Among the participants, many were involved in ongoing collaborative studies (e.g., ELITE, GAMES, Gene SMART, GENESIS, and POWERGENE). A consensus emerged among participants that it would be advantageous to bring together all current studies and those recently launched into one new large collaborative initiative, which was subsequently named the Athlome Project Consortium.

  View details for DOI 10.1152/physiolgenomics.00105.2015

  View details for PubMedID 26715623

  View details for PubMedCentralID PMC4773890

• Somatic Mosaicism of Novel SCN5A Mutation in Purkinje System (PS) may Underlie 2: 1 Block in an Infant with Long QT Syndrome (LQTS) Yu, J. K., Boyle, P. M., O'Hara, T., Priest, J. R., Ashley, E., Trayanova, N. A. CELL PRESS. 2016: 527A

  View details for DOI 10.1016/j.bpj.2015.11.2820

  View details for Web of Science ID 000375143000062

• Medical implications of technical accuracy in genome sequencing. Genome medicine Goldfeder, R. L., Priest, J. R., Zook, J. M., Grove, M. E., Waggott, D., Wheeler, M. T., Salit, M., Ashley, E. A. 2016; 8 (1): 24-?

  Abstract

  As whole exome sequencing (WES) and whole genome sequencing (WGS) transition from research tools to clinical diagnostic tests, it is increasingly critical for sequencing methods and analysis pipelines to be technically accurate. The Genome in a Bottle Consortium has recently published a set of benchmark SNV, indel, and homozygous reference genotypes for the pilot whole genome NIST Reference Material based on the NA12878 genome.We examine the relationship between human genome complexity and genes/variants reported to be associated with human disease. Specifically, we map regions of medical relevance to benchmark regions of high or low confidence. We use benchmark data to assess the sensitivity and positive predictive value of two representative sequencing pipelines for specific classes of variation.We observe that the accuracy of a variant call depends on the genomic region, variant type, and read depth, and varies by analytical pipeline. We find that most false negative WGS calls result from filtering while most false negative WES variants relate to poor coverage. We find that only 74.6% of the exonic bases in ClinVar and OMIM genes and 82.1% of the exonic bases in ACMG-reportable genes are found in high-confidence regions. Only 990 genes in the genome are found entirely within high-confidence regions while 593 of 3,300 ClinVar/OMIM genes have less than 50% of their total exonic base pairs in high-confidence regions. We find greater than 77 % of the pathogenic or likely pathogenic SNVs currently in ClinVar fall within high-confidence regions. We identify sites that are prone to sequencing errors, including thousands present in publicly available variant databases. Finally, we examine the clinical impact of mandatory reporting of secondary findings, highlighting a false positive variant found in BRCA2.Together, these data illustrate the importance of appropriate use and continued improvement of technical benchmarks to ensure accurate and judicious interpretation of next-generation DNA sequencing results in the clinical setting.

  View details for DOI 10.1186/s13073-016-0269-0

  View details for PubMedID 26932475

  View details for PubMedCentralID PMC4774017

• Redox regulation of vascular remodeling. Cellular and molecular life sciences : CMLS Karimi Galougahi, K., Ashley, E. A., Ali, Z. A. 2016; 73 (2): 349?63

  Abstract

  Vascular remodeling is a dynamic process of structural and functional changes in response to biochemical and biomechanical signals in a complex in vivo milieu. While inherently adaptive, dysregulation leads to maladaptive remodeling. Reactive oxygen species participate in homeostatic cell signaling in tightly regulated- and compartmentalized cellular circuits. It is well established that perturbations in oxidation-reduction (redox) homeostasis can lead to a state of oxidative-, and more recently, reductive stress. We provide an overview of the redox signaling in the vasculature and review the role of oxidative- and reductive stress in maladaptive vascular remodeling. Particular emphasis has been placed on essential processes that determine phenotype modulation, migration and fate of the main cell types in the vessel wall. Recent advances in systems biology and the translational opportunities they may provide to specifically target the redox pathways driving pathological vascular remodeling are discussed.

  View details for PubMedID 26483132

• Denoising of Quality Scores for Boosted Inference and Reduced Storage Ochoa, I., Hernaez, M., Goldfeder, R., Weissman, T., Ashley, E., Bilgin, A., Marcellin, M. W., SerraSagrista, J., Storer, J. A. IEEE. 2016: 251?60

  Abstract

  Massive amounts of sequencing data are being generated thanks to advances in sequencing technology and a dramatic drop in the sequencing cost. Much of the raw data are comprised of nucleotides and the corresponding quality scores that indicate their reliability. The latter are more difficult to compress and are themselves noisy. Lossless and lossy compression of the quality scores has recently been proposed to alleviate the storage costs, but reducing the noise in the quality scores has remained largely unexplored. This raw data is processed in order to identify variants; these genetic variants are used in important applications, such as medical decision making. Thus improving the performance of the variant calling by reducing the noise contained in the quality scores is important. We propose a denoising scheme that reduces the noise of the quality scores and we demonstrate improved inference with this denoised data. Specifically, we show that replacing the quality scores with those generated by the proposed denoiser results in more accurate variant calling in general. Moreover, a consequence of the denoising is that the entropy of the produced quality scores is smaller, and thus significant compression can be achieved with respect to lossless compression of the original quality scores. We expect our results to provide a baseline for future research in denoising of quality scores. The code used in this work as well as a Supplement with all the results are available at http://web.stanford.edu/~iochoa/DCCdenoiser_CodeAndSupplement.zip.

  View details for PubMedID 29098178

• The Future of Genomic Research in Athletic Performance and Adaptation to Training. Medicine and sport science Wang, G., Tanaka, M., Eynon, N., North, K. N., Williams, A. G., Collins, M., Moran, C. N., Britton, S. L., Fuku, N., Ashley, E. A., Klissouras, V., Lucia, A., Ahmetov, I. I., de Geus, E., Alsayrafi, M., Pitsiladis, Y. P. 2016; 61: 55-67

  Abstract

  Despite numerous attempts to discover genetic variants associated with elite athletic performance, an individual's trainability and injury predisposition, there has been limited progress to date. Past reliance on candidate gene studies focusing predominantly on genotyping a limited number of genetic variants in small, often heterogeneous cohorts has not generated results of practical significance. Hypothesis-free genome-wide approaches will in the future provide more comprehensive coverage and in-depth understanding of the biology underlying sports-related traits and related genetic mechanisms. Large, collaborative projects with sound experimental designs (e.g. clearly defined phenotypes, considerations and controls for sources of variability, and necessary replications) are required to produce meaningful results, especially when a hypothesis-free approach is used. It remains to be determined whether the novel approaches under current implementation will result in findings with real practical significance. This review will briefly summarize current and future directions in exercise genetics and genomics.

  View details for DOI 10.1159/000445241

  View details for PubMedID 27287077

• Deep learning automates the quantitative analysis of individual cells in live-cell imaging experiments. Van Valen, D., Kudo, T., Lane, K., Macklin, D., Quach, N., DeFelice, M., Maayan, I., Tanouchi, Y., Ashley, E., Covert, M. W. AMER SOC CELL BIOLOGY. 2016

  View details for Web of Science ID 000396046900068

• Redox regulation of vascular remodeling CELLULAR AND MOLECULAR LIFE SCIENCES Galougahi, K. K., Ashley, E. A., Ali, Z. A. 2016; 73 (2): 349-363

  Abstract

  Vascular remodeling is a dynamic process of structural and functional changes in response to biochemical and biomechanical signals in a complex in vivo milieu. While inherently adaptive, dysregulation leads to maladaptive remodeling. Reactive oxygen species participate in homeostatic cell signaling in tightly regulated- and compartmentalized cellular circuits. It is well established that perturbations in oxidation-reduction (redox) homeostasis can lead to a state of oxidative-, and more recently, reductive stress. We provide an overview of the redox signaling in the vasculature and review the role of oxidative- and reductive stress in maladaptive vascular remodeling. Particular emphasis has been placed on essential processes that determine phenotype modulation, migration and fate of the main cell types in the vessel wall. Recent advances in systems biology and the translational opportunities they may provide to specifically target the redox pathways driving pathological vascular remodeling are discussed.

  View details for DOI 10.1007/s00018-015-2068-y

  View details for Web of Science ID 000368077900007

• Systems Genomics Identifies a Key Role for Hypocretin/Orexin Receptor-2 in Human Heart Failure JOURNAL OF THE AMERICAN COLLEGE OF CARDIOLOGY Perez, M. V., Pavlovic, A., Shang, C., Wheeler, M. T., Miller, C. L., Liu, J., Dewey, F. E., Pan, S., Thanaporn, P. K., Absher, D., Brandimarto, J., Salisbury, H., Chan, K., Mukherjee, R., Konadhode, R. P., Myers, R. M., Sedehi, D., Scammell, T. E., Quertermous, T., Cappola, T., Ashley, E. A. 2015; 66 (22): 2522-2533

  Abstract

  The genetic determinants of heart failure (HF) and response to medical therapy remain unknown. We hypothesized that identifying genetic variants of HF that associate with response to medical therapy would elucidate the genetic basis of cardiac function.This study sought to identify genetic variations associated with response to HF therapy.This study compared extremes of response to medical therapy in 866 HF patients using a genome-wide approach that informed the systems-based design of a customized single nucleotide variant array. The effect of genotype on gene expression was measured using allele-specific luciferase reporter assays. Candidate gene transcription-deficient mice underwent echocardiography and treadmill exercise. The ability of the target gene agonist to rescue mice from chemically-induced HF was assessed with echocardiography.Of 866 HF patients, 136 had an ejection fraction improvement of 20% attributed to resynchronization (n = 83), revascularization (n = 7), tachycardia resolution (n = 2), alcohol cessation (n = 1), or medications (n = 43). Those with the minor allele for rs7767652, upstream of hypocretin (orexin) receptor-2 (HCRTR2), were less likely to have improved left ventricular function (odds ratio: 0.40 per minor allele; p = 3.29 × 10(-5)). In a replication cohort of 798 patients, those with a minor allele for rs7767652 had a lower prevalence of ejection fraction >35% (odds ratio: 0.769 per minor allele; p = 0.021). In an HF model, HCRTR2-deficient mice exhibited poorer cardiac function, worse treadmill exercise capacity, and greater myocardial scarring. Orexin, an HCRTR2 agonist, rescued function in this HF mouse model.A systems approach identified a novel genetic contribution to human HF and a promising therapeutic agent efficacious in an HF model.

  View details for DOI 10.1016/j.jacc.2015.09.061

  View details for Web of Science ID 000366094500009

  View details for PubMedID 26653627

• Examining Prevailing Genotype-Phenotype Correlations in Hypertrophic Cardiomyopathy: Findings From The Sarcomeric Human Cardiomyopathy Registry (SHaRe) Ho, C. Y., Day, S. M., Ashley, E. A., Michels, M., Pereira, A., Fox, J., Caleshu, C., Cirino, A. L., Colan, S., Wrolstad, D., Green, E. M., Olivotto, I., SHaRe Investigators LIPPINCOTT WILLIAMS & WILKINS. 2015: 2277

  View details for Web of Science ID 000365861100038

• Direct-to-consumer genetic testing for predicting sports performance and talent identification: Consensus statement BRITISH JOURNAL OF SPORTS MEDICINE Webborn, N., Williams, A., McNamee, M., Bouchard, C., Pitsiladis, Y., Ahmetov, I., Ashley, E., Byrne, N., Camporesi, S., Collins, M., Dijkstra, P., Eynon, N., Fuku, N., Garton, F. C., Hoppe, N., Holm, S., Kaye, J., Klissouras, V., Lucia, A., Maase, K., Moran, C., North, K. N., Pigozzi, F., Wang, G. 2015; 49 (23): 1486-1491

  Abstract

  The general consensus among sport and exercise genetics researchers is that genetic tests have no role to play in talent identification or the individualised prescription of training to maximise performance. Despite the lack of evidence, recent years have witnessed the rise of an emerging market of direct-to-consumer marketing (DTC) tests that claim to be able to identify children's athletic talents. Targeted consumers include mainly coaches and parents. There is concern among the scientific community that the current level of knowledge is being misrepresented for commercial purposes. There remains a lack of universally accepted guidelines and legislation for DTC testing in relation to all forms of genetic testing and not just for talent identification. There is concern over the lack of clarity of information over which specific genes or variants are being tested and the almost universal lack of appropriate genetic counselling for the interpretation of the genetic data to consumers. Furthermore independent studies have identified issues relating to quality control by DTC laboratories with different results being reported from samples from the same individual. Consequently, in the current state of knowledge, no child or young athlete should be exposed to DTC genetic testing to define or alter training or for talent identification aimed at selecting gifted children or adolescents. Large scale collaborative projects, may help to develop a stronger scientific foundation on these issues in the future.

  View details for DOI 10.1136/bjsports-2015-095343

  View details for PubMedID 26582191

• Gender Differences in Ventricular Remodeling and Function in College Athletes, Insights from Lean Body Mass Scaling and Deformation Imaging AMERICAN JOURNAL OF CARDIOLOGY Giraldeau, G., Kobayashi, Y., Finocchiaro, G., Wheeler, M., Perez, M., Kuznetsova, T., Lord, R., George, K. P., Oxborough, D., Schnittger, T., Froelicher, V., Liang, D., Ashley, E., Haddad, F. 2015; 116 (10): 1610-1616

  Abstract

  Several studies suggest gender differences in ventricular dimensions in athletes. Few studies have, however, made comparisons of data indexed for lean body mass (LBM) using allometry. Ninety Caucasian college athletes (mixed sports) who were matched for age, ethnicity, and sport total cardiovascular demands underwent dual-energy x-ray absorptiometry scan for quantification of LBM. Athletes underwent comprehensive assessment of left and right ventricular and atrial structure and function using 2-dimensional echocardiography and deformation imaging using the TomTec analysis system. The mean age of the study population was 18.9 ± 1.9 years. Female athletes (n = 45) had a greater fat free percentage (19.4 ± 3.7%) compared to male athletes (11.5 ± 3.7%). When scaled to body surface area, male had on average 19 ± 3% (p <0.001) greater left ventricular (LV) mass; in contrast, when scaled to LBM, there was no significant difference in indexed LV mass -1.4 ± 3.0% (p = 0.63). Similarly, when allometrically scaled to LBM, there was no significant gender-based difference in LV or left atrial volumes. Although female athletes had mildly higher LV ejection fraction and LV global longitudinal strain in absolute value, systolic strain rate and allometrically indexed stroke volume were not different between genders (1.5 ± 3.6% [p = 0.63] and 0.0 ± 3.7% [p = 0.93], respectively). There were no differences in any of the functional atrial indexes including strain or strain rate parameters. In conclusion, gender-related differences in ventricular dimensions or function (stroke volume) appear less marked, if not absent, when indexing using LBM allometrically.

  View details for DOI 10.1016/j.amjcard.2015.08.026

  View details for PubMedID 26456207

• Limitations of Current AHA Guidelines and Proposal of New Guidelines for the Preparticipation Examination of Athletes CLINICAL JOURNAL OF SPORT MEDICINE Dunn, T. P., Pickham, D., Aggarwal, S., Saini, D., Kumar, N., Wheeler, M. T., Perez, M., Ashley, E., Froelicher, V. F. 2015; 25 (6): 472-477

  Abstract

  To examine the prevalence of athletes who screen positive with the preparticipation examination guidelines from the American Heart Association, the AHA 12-elements, in combination with 3 screening electrocardiogram (ECG) criteria.Observational cross-sectional study.Stanford University Sports Medicine Clinic.Total of 1596 participants, including 297 (167 male; mean age, 16.2 years) high school athletes, 1016 (541 male; mean age, 18.8 years) collegiate athletes, and 283 (mean age, 26.3 years) male professional athletes.Athletes were screened using the 8 personal and family history questions from the AHA 12-elements. Electrocardiograms were obtained for all participants and interpreted using Seattle criteria, Stanford criteria, and European Society of Cardiology (ESC) recommendations.Approximately one-quarter of all athletes (23.8%) had at least 1 positive response to the AHA personal and family history elements. High school and college athletes had similar rates of having at least 1 positive response (25.9% vs 27.4%), whereas professional athletes had a significantly lower rate of having at least 1 positive response (8.8%, P < 0.05). Females reported more episodes of unexplained syncope (11.4% vs 7.5%, P = 0.017) and excessive exertional dyspnea with exercise (11.1% vs 6.1%, P = 0.001) than males. High school athletes had more positive responses to the family history elements when compared with college athletes (P < 0.05). The percentage of athletes who had an abnormal ECG varied between Seattle criteria (6.0%), Stanford criteria (8.8%), and ESC recommendations (26.8%).Many athletes screen positive under current screening recommendations, and ECG results vary widely by interpretation criteria.In a patient population without any adverse cardiovascular events, the currently recommended AHA 12-elements have an unacceptably high rate of false positives. Newer screening guidelines are needed, with fewer false positives and evidence-based updates.

  View details for Web of Science ID 000364310700003

  View details for PubMedID 25915146

• Promise of Precision Medicine Reply JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION Ashley, E. A. 2015; 314 (16): 1752?53

  View details for PubMedID 26505606

• Sequence to Medical Phenotypes: A Framework for Interpretation of Human Whole Genome DNA Sequence Data PLOS GENETICS Dewey, F. E., Grove, M. E., Priest, J. R., Waggott, D., Batra, P., Miller, C. L., Wheeler, M., Zia, A., Pan, C., Karzcewski, K. J., Miyake, C., Whirl-Carrillo, M., Klein, T. E., Datta, S., Altman, R. B., Snyder, M., Quertermous, T., Ashley, E. A. 2015; 11 (10)

  Abstract

  High throughput sequencing has facilitated a precipitous drop in the cost of genomic sequencing, prompting predictions of a revolution in medicine via genetic personalization of diagnostic and therapeutic strategies. There are significant barriers to realizing this goal that are related to the difficult task of interpreting personal genetic variation. A comprehensive, widely accessible application for interpretation of whole genome sequence data is needed. Here, we present a series of methods for identification of genetic variants and genotypes with clinical associations, phasing genetic data and using Mendelian inheritance for quality control, and providing predictive genetic information about risk for rare disease phenotypes and response to pharmacological therapy in single individuals and father-mother-child trios. We demonstrate application of these methods for disease and drug response prognostication in whole genome sequence data from twelve unrelated adults, and for disease gene discovery in one father-mother-child trio with apparently simplex congenital ventricular arrhythmia. In doing so we identify clinically actionable inherited disease risk and drug response genotypes in pre-symptomatic individuals. We also nominate a new candidate gene in congenital arrhythmia, ATP2B4, and provide experimental evidence of a regulatory role for variants discovered using this framework.

  View details for DOI 10.1371/journal.pgen.1005496

  View details for Web of Science ID 000364401600008

  View details for PubMedID 26448358

  View details for PubMedCentralID PMC4598191

• A Rapid, High-Quality, Cost-Effective, Comprehensive and Expandable Targeted Next-Generation Sequencing Assay for Inherited Heart Diseases. Circulation research Wilson, K. D., Shen, P., Fung, E., Karakikes, I., Zhang, A., Inanloorahatloo, K., Odegaard, J., Sallam, K., Davis, R. W., Lui, G. K., Ashley, E. A., Scharfe, C., Wu, J. C. 2015; 117 (7): 603-611

  Abstract

  Thousands of mutations across >50 genes have been implicated in inherited cardiomyopathies. However, options for sequencing this rapidly evolving gene set are limited because many sequencing services and off-the-shelf kits suffer from slow turnaround, inefficient capture of genomic DNA, and high cost. Furthermore, customization of these assays to cover emerging targets that suit individual needs is often expensive and time consuming.We sought to develop a custom high throughput, clinical-grade next-generation sequencing assay for detecting cardiac disease gene mutations with improved accuracy, flexibility, turnaround, and cost.We used double-stranded probes (complementary long padlock probes), an inexpensive and customizable capture technology, to efficiently capture and amplify the entire coding region and flanking intronic and regulatory sequences of 88 genes and 40 microRNAs associated with inherited cardiomyopathies, congenital heart disease, and cardiac development. Multiplexing 11 samples per sequencing run resulted in a mean base pair coverage of 420, of which 97% had >20× coverage and >99% were concordant with known heterozygous single nucleotide polymorphisms. The assay correctly detected germline variants in 24 individuals and revealed several polymorphic regions in miR-499. Total run time was 3 days at an approximate cost of $100 per sample.Accurate, high-throughput detection of mutations across numerous cardiac genes is achievable with complementary long padlock probe technology. Moreover, this format allows facile insertion of additional probes as more cardiomyopathy and congenital heart disease genes are discovered, giving researchers a powerful new tool for DNA mutation detection and discovery.

  View details for DOI 10.1161/CIRCRESAHA.115.306723

  View details for PubMedID 26265630

• The impact of chronic endurance and resistance training upon the right ventricular phenotype in male athletes. European journal of applied physiology Utomi, V., Oxborough, D., Ashley, E., Lord, R., Fletcher, S., Stembridge, M., Shave, R., Hoffman, M. D., Whyte, G., Somauroo, J., Sharma, S., George, K. 2015; 115 (8): 1673-1682

  Abstract

  The traditional view of differential left ventricular adaptation to training type has been questioned. Right ventricular (RV) data in athletes are emerging but whether training type mediates this is not clear. The primary aim of this study was to evaluate the RV phenotype in endurance- vs. resistance-trained male athletes. Secondary aims included comparison of RV function in all groups using myocardial speckle tracking, and the impact of allometric scaling on RV data interpretation.A prospective cross-sectional design assessed RV structure and function in 19 endurance-trained (ET), 21 resistance-trained (RT) and 21 sedentary control subjects (CT). Standard 2D tissue Doppler imaging and speckle tracking echocardiography assessed RV structure and function. Indexing of RV structural parameters to body surface area (BSA) was undertaken using allometric scaling.A higher absolute RV diastolic area was observed in ET (mean ± SD: 27 ± 4 cm(2)) compared to CT (22 ± 4 cm(2); P < 0.05) that was maintained after scaling. Whilst absolute RV longitudinal dimension was greater in ET (88 ± 9 mm) than CT (81 ± 10 mm; P < 0.05), this difference was removed after scaling. Wall thickness was not different between ET and RT and there were no between group differences in global or regional RV function.We present some evidence of RV adaptation to chronic ET in male athletes but limited structural characteristics of an athletic heart were observed in RT. Global and regional RV functions were comparable between groups. Allometric scaling altered data interpretation in some variables.

  View details for DOI 10.1007/s00421-015-3147-3

  View details for PubMedID 25779702

• Bayesian Selection of Modifier Genes in Hypertrophic Cardiomyopathy Through Whole Genome Sequencing Wheeler, M., Waggott, D., Grove, M., Dewey, F., Pan, C., Pavlovic, A., Goldfeder, R., Puckelwartz, M., Day, S., McNally, E., Dorn, G. W., Ashley, E. LIPPINCOTT WILLIAMS & WILKINS. 2015

  View details for Web of Science ID 000374552800296

• Achieving high-sensitivity for clinical applications using augmented exome sequencing GENOME MEDICINE Patwardhan, A., Harris, J., Leng, N., Bartha, G., Church, D. M., Luo, S., Haudenschild, C., Pratt, M., Zook, J., Salit, M., Tirch, J., Morra, M., Chervitz, S., Li, M., Clark, M., Garcia, S., Chandratillake, G., Kirk, S., Ashley, E., Snyder, M., Altman, R., Bustamante, C., Butte, A. J., West, J., Chen, R. 2015; 7

  Abstract

  Whole exome sequencing is increasingly used for the clinical evaluation of genetic disease, yet the variation of coverage and sensitivity over medically relevant parts of the genome remains poorly understood. Several sequencing-based assays continue to provide coverage that is inadequate for clinical assessment.Using sequence data obtained from the NA12878 reference sample and pre-defined lists of medically-relevant protein-coding and noncoding sequences, we compared the breadth and depth of coverage obtained among four commercial exome capture platforms and whole genome sequencing. In addition, we evaluated the performance of an augmented exome strategy, ACE, that extends coverage in medically relevant regions and enhances coverage in areas that are challenging to sequence. Leveraging reference call-sets, we also examined the effects of improved coverage on variant detection sensitivity.We observed coverage shortfalls with each of the conventional exome-capture and whole-genome platforms across several medically interpretable genes. These gaps included areas of the genome required for reporting recently established secondary findings (ACMG) and known disease-associated loci. The augmented exome strategy recovered many of these gaps, resulting in improved coverage in these areas. At clinically-relevant coverage levels (100 % bases covered at ?20×), ACE improved coverage among genes in the medically interpretable genome (>90 % covered relative to 10-78 % with other platforms), the set of ACMG secondary finding genes (91 % covered relative to 4-75 % with other platforms) and a subset of variants known to be associated with human disease (99 % covered relative to 52-95 % with other platforms). Improved coverage translated into improvements in sensitivity, with ACE variant detection sensitivities (>97.5 % SNVs, >92.5 % InDels) exceeding that observed with conventional whole-exome and whole-genome platforms.Clinicians should consider analytical performance when making clinical assessments, given that even a few missed variants can lead to reporting false negative results. An augmented exome strategy provides a level of coverage not achievable with other platforms, thus addressing concerns regarding the lack of sensitivity in clinically important regions. In clinical applications where comprehensive coverage of medically interpretable areas of the genome requires higher localized sequencing depth, an augmented exome approach offers both cost and performance advantages over other sequencing-based tests.

  View details for DOI 10.1186/s13073-015-0197-4

  View details for Web of Science ID 000359428300001

  View details for PubMedID 26269718

  View details for PubMedCentralID PMC4534066

• Long-term outcomes of septal reduction for obstructive hypertrophic cardiomyopathy. Journal of cardiology Sedehi, D., Finocchiaro, G., Tibayan, Y., Chi, J., Pavlovic, A., Kim, Y. M., Tibayan, F. A., Reitz, B. A., Robbins, R. C., Woo, J., Ha, R., Lee, D. P., Ashley, E. A. 2015; 66 (1): 57-62

  Abstract

  Surgical myectomy and alcohol septal ablation (ASA) aim to decrease left ventricular outflow tract (LVOT) gradient in hypertrophic cardiomyopathy (HCM). Outcome of myectomy beyond 10 years has rarely been described. We describe 20 years of follow-up of surgical myectomy and 5 years of follow-up for ASA performed for obstructive HCM.We studied 171 patients who underwent myectomy for symptomatic LVOT obstruction between 1972 and 2006. In addition, we studied 52 patients who underwent ASA for the same indication and who declined surgery. Follow-up of New York Heart Association (NYHA) functional class, echocardiographic data, and vital status were obtained from patient records. Mortality rates were compared with expected mortality rates of age- and sex-matched populations.Surgical myectomy improved NYHA class (2.74±0.65 to 1.54±0.74, p<0.001), reduced resting gradient (67.4±43.4mmHg to 11.2±16.4mmHg, p<0.001), and inducible LVOT gradient (98.1±34.7mmHg to 33.6±34.9mmHg, p<0.001). Similarly, ASA improved functional class (2.99±0.35 to 1.5±0.74, p<0.001), resting gradient (67.1±26.9mmHg to 23.9±29.4mmHg, p<0.001) and provoked gradient (104.4±34.9mmHg to 35.5±38.6mmHg, p<0.001). Survival after myectomy at 5, 10, 15, and 20 years of follow-up was 92.9%, 81.1%, 68.9%, and 47.5%, respectively. Of note, long-term survival after myectomy was lower than for the general population [standardized mortality ratio (SMR)=1.40, p<0.005], but still compared favorably with historical data from non-operated HCM patients. Survival after ASA at 2 and 5 years was 97.8% and 94.7%, respectively. Short-term (5 year) survival after ASA (SMR=0.61, p=0.48) was comparable to that of the general population.Long-term follow-up of septal reduction strategies in obstructive HCM reveals that surgical myectomy and ASA are effective for symptom relief and LVOT gradient reduction and are associated with favorable survival. While overall prognosis for the community HCM population is similar to the general population, the need for surgical myectomy may identify a sub-group with poorer long-term prognosis. We await long-term outcomes of more extensive myectomy approaches adopted in the past 10 years at major institutions.

  View details for DOI 10.1016/j.jjcc.2014.08.010

  View details for PubMedID 25238885

• Long-term outcomes of septal reduction for obstructive hypertrophic cardiomyopathy JOURNAL OF CARDIOLOGY Sedehi, D., Finocchiaro, G., Tibayan, Y., Chi, J., Pavlovic, A., Kim, Y. M., Tibayan, F. A., Reitz, B. A., Robbins, R. C., Woo, J., Ha, R., Lee, D. P., Ashley, E. A. 2015; 66 (1-2): 57-62

  Abstract

  Surgical myectomy and alcohol septal ablation (ASA) aim to decrease left ventricular outflow tract (LVOT) gradient in hypertrophic cardiomyopathy (HCM). Outcome of myectomy beyond 10 years has rarely been described. We describe 20 years of follow-up of surgical myectomy and 5 years of follow-up for ASA performed for obstructive HCM.We studied 171 patients who underwent myectomy for symptomatic LVOT obstruction between 1972 and 2006. In addition, we studied 52 patients who underwent ASA for the same indication and who declined surgery. Follow-up of New York Heart Association (NYHA) functional class, echocardiographic data, and vital status were obtained from patient records. Mortality rates were compared with expected mortality rates of age- and sex-matched populations.Surgical myectomy improved NYHA class (2.74±0.65 to 1.54±0.74, p<0.001), reduced resting gradient (67.4±43.4mmHg to 11.2±16.4mmHg, p<0.001), and inducible LVOT gradient (98.1±34.7mmHg to 33.6±34.9mmHg, p<0.001). Similarly, ASA improved functional class (2.99±0.35 to 1.5±0.74, p<0.001), resting gradient (67.1±26.9mmHg to 23.9±29.4mmHg, p<0.001) and provoked gradient (104.4±34.9mmHg to 35.5±38.6mmHg, p<0.001). Survival after myectomy at 5, 10, 15, and 20 years of follow-up was 92.9%, 81.1%, 68.9%, and 47.5%, respectively. Of note, long-term survival after myectomy was lower than for the general population [standardized mortality ratio (SMR)=1.40, p<0.005], but still compared favorably with historical data from non-operated HCM patients. Survival after ASA at 2 and 5 years was 97.8% and 94.7%, respectively. Short-term (5 year) survival after ASA (SMR=0.61, p=0.48) was comparable to that of the general population.Long-term follow-up of septal reduction strategies in obstructive HCM reveals that surgical myectomy and ASA are effective for symptom relief and LVOT gradient reduction and are associated with favorable survival. While overall prognosis for the community HCM population is similar to the general population, the need for surgical myectomy may identify a sub-group with poorer long-term prognosis. We await long-term outcomes of more extensive myectomy approaches adopted in the past 10 years at major institutions.

  View details for DOI 10.1016/j.jjcc.2014.08.010

  View details for Web of Science ID 000359684600010

• Systematic Comparison of Digital Electrocardiograms From Healthy Athletes and Patients With Hypertrophic Cardiomyopathy. Journal of the American College of Cardiology Bent, R. E., Wheeler, M. T., Hadley, D., Knowles, J. W., Pavlovic, A., Finocchiaro, G., Haddad, F., Salisbury, H., Race, S., Shmargad, Y., Matheson, G. O., Kumar, N., Saini, D., Froelicher, V., Ashley, E., Perez, M. V. 2015; 65 (22): 2462-2463

  View details for DOI 10.1016/j.jacc.2015.03.559

  View details for PubMedID 26046742

• ClinGen - The Clinical Genome Resource NEW ENGLAND JOURNAL OF MEDICINE Rehm, H. L., Berg, J. S., Brooks, L. D., Bustamante, C. D., Evans, J. P., Landrum, M. J., Ledbetter, D. H., Maglott, D. R., Martin, C. L., Nussbaum, R. L., Plon, S. E., Ramos, E. M., Sherry, S. T., Watson, M. S. 2015; 372 (23): 2235-2242

  View details for DOI 10.1056/NEJMsr1406261

  View details for PubMedID 26014595

• Arrhythmogenic Right Ventricular Cardiomyopathy Toward a Modern Clinical and Genomic Understanding CIRCULATION-CARDIOVASCULAR GENETICS Dunn, K. E., Ashley, E. A. 2015; 8 (3): 421?24

  View details for PubMedID 26082552

• Cardiopulmonary responses and prognosis in hypertrophic cardiomyopathy: a potential role for comprehensive noninvasive hemodynamic assessment. JACC. Heart failure Finocchiaro, G., Haddad, F., Knowles, J. W., Caleshu, C., Pavlovic, A., Homburger, J., Shmargad, Y., Sinagra, G., Magavern, E., Wong, M., Perez, M., Schnittger, I., Myers, J., Froelicher, V., Ashley, E. A. 2015; 3 (5): 408-418

  Abstract

  This study sought to discover the key determinants of exercise capacity, maximal oxygen consumption (oxygen uptake [Vo2]), and ventilatory efficiency (ventilation/carbon dioxide output [VE/Vco2] slope) and assess the prognostic potential of metabolic exercise testing in hypertrophic cardiomyopathy (HCM).The intrinsic mechanisms leading to reduced functional tolerance in HCM are unclear.The study sample included 156 HCM patients consecutively enrolled from January 1, 2007 to January 1, 2012 with a complete clinical assessment, including rest and stress echocardiography and cardiopulmonary exercise test (CPET) with impedance cardiography. Patients were also followed for the composite outcome of cardiac-related death, heart transplant, and functional deterioration leading to septal reduction therapy (myectomy or septal alcohol ablation).Abnormalities in CPET responses were frequent, with 39% (n = 61) of the sample showing a reduced exercise tolerance (Vo2 max <80% of predicted) and 19% (n = 30) characterized by impaired ventilatory efficiency (VE/Vco2 slope >34). The variables most strongly associated with exercise capacity (expressed in metabolic equivalents), were peak cardiac index (r = 0.51, p < 0.001), age (r = -0.25, p < 0.01), male sex (r = 0.24, p = 0.02), and indexed right ventricular end-diastolic area (r = 0.31, p = 0.002), resulting in an R(2) of 0.51, p < 0.001. Peak cardiac index was the main predictor of peak Vo2 (r = 0.61, p < 0.001). The variables most strongly related to VE/VCO2 slope were E/E' (r = 0.23, p = 0.021) and indexed left atrial volume index (LAVI) (r = 0.34, p = 0.005) (model R(2) = 0.15). The composite endpoint occurred in 21 (13%) patients. In an exploratory analysis, 3 variables were independently associated with the composite outcome (mean follow-up 27 ± 11 months): peak Vo2 <80% of predicted (hazard ratio: 4.11; 95% confidence interval [CI]: 1.46 to 11.59; p = 0.008), VE/Vco2 slope >34 (hazard ratio: 3.14; 95% CI: 1.26 to 7.87; p = 0.014), and LAVI >40 ml/m(2) (hazard ratio: 3.32; 95% CI: 1.08 to 10.16; p = 0.036).In HCM, peak cardiac index is the main determinant of exercise capacity, but it is not significantly related to ventilatory efficiency. Peak Vo2, ventilatory inefficiency, and LAVI are associated with an increased risk of major events in the short-term follow-up.

  View details for DOI 10.1016/j.jchf.2014.11.011

  View details for PubMedID 25863972

• Prevalence and Prognostic Role of Right Ventricular Involvement in Stress-Induced Cardiomyopathy JOURNAL OF CARDIAC FAILURE Finocchiaro, G., Kobayashi, Y., Magavern, E., Zhou, J. Q., Ashley, E., Sinagra, G., Schnittger, I., Knowles, J. W., Fearon, W. F., Haddad, F., Tremmel, J. A. 2015; 21 (5): 419-425

  Abstract

  Stress-induced cardiomyopathy (SCM) is a reversible cardiomyopathy observed in patients without significant coronary disease. The aim of this study was to assess the incidence and clinical significance of right ventricular (RV) involvement in SCM.We retrospectively analyzed echocardiograms from 40 consecutive patients who presented with SCM at Stanford University Medical Center from September 2000 to November 2010. The primary end point was overall mortality. RV involvement was observed in 20 patients (50%; global RV hypokinesia in 15 patients and focal RV apical akinesia in 5 patients). The independent correlates of RV involvement were older age (odds ratio [OR] 1.09, 95% confidence interval [CI] 1.02-1.7two, P = .01) and LVEF (per 10% decrease: OR 3.60, CI 1.77-7.32; P = .02). At a mean follow-up of 44 ± 32 months, 12 patients (30%) died (in-hospital death in 3 patients). At multivariate analysis, the presence of an RV fractional area change <35% emerged as an independent predictor of death (OR 3.6, CI 1.06-12.41; P = .04).RV involvement is a common finding in SCM, and may present as either global or focal RV apical involvement. Both older age and lower LVEF are associated with a higher risk of RV involvement, which appears to be a major predictor of death.

  View details for DOI 10.1016/j.cardfail.2015.02.001

  View details for PubMedID 25704104

• Computerized Q wave dimensions in athletes and hypertrophic cardiomyopathy patients JOURNAL OF ELECTROCARDIOLOGY Bent, R. E., Wheeler, M. T., Hadley, D., Froelicher, V., Ashley, E., Perez, M. V. 2015; 48 (3): 362-367

  Abstract

  There is controversy regarding Q wave criteria for assessing risk for hypertrophic cardiomyopathy (HCM) in young athletes.The 12-lead ECGs from Preparticipation screening in healthy athletes and patients with HCM were studied retrospectively. All 12 leads were measured using the same automated ECG analysis program.There were a total of 225 HCM patients and 1124 athletes with 12-lead electrocardiograms available for analysis. Athletes were on average 20 years of age, 65% were male and 24% were African-American. Patients with HCM were on average 51 years of age, 56% were male and 5.8% were African-American. Q waves by either amplitude, duration or area criteria were more prevalent in males than females, in lateral leads than inferior and in HCM patients than athletes. The most striking difference in Q waves between the groups was in Limb lead I and in the females. Tall, skinny Q waves were rare in athletes and had the highest prevalence of only 3.7% in male HCM patients.Q waves are more common in males compared to females and in patients with HCM compared to athletes. Q waves of 30 ms or more in limb lead I appear to offer the greatest discriminatory value for separating patients with HCM from athletes.

  View details for DOI 10.1016/j.jelectrocard.2015.01.009

  View details for PubMedID 25732098

• The Independent Predictive Value of Peak Oxygen Consumption, Left ventricular Strain and Atrial Remodelling in Patients With Dilated Cardiomyopathy Boulate, D., Banerjee, D., Ariyama, M., Wheeler, M., Knowles, J. W., Kobayashi, Y., Perez, M., Wu, J., Schnittger, I., Kouznetsova, T., Myers, J., Haddad, F., Ashley, E. A. ELSEVIER SCIENCE INC. 2015: S186

  View details for Web of Science ID 000353251500484

• Hypertrophic cardiomyopathy: can the horse be put back in the barn? Journal of the American College of Cardiology Wheeler, M. T., Ashley, E. A. 2015; 65 (6): 570-572

  View details for DOI 10.1016/j.jacc.2014.12.004

  View details for PubMedID 25677316

• RNA-Seq identifies novel myocardial gene expression signatures of heart failure GENOMICS Liu, Y., Morley, M., Brandimarto, J., Hannenhalli, S., Hu, Y., Ashley, E. A., Tang, W. H., Moravec, C. S., Margulies, K. B., Cappola, T. P., Li, M., Consortium, M. 2015; 105 (2): 83-89

  Abstract

  Heart failure is a complex clinical syndrome and has become the most common reason for adult hospitalization in developed countries. Two subtypes of heart failure, ischemic heart disease (ISCH) and dilated cardiomyopathy (DCM), have been studied using microarray platforms. However, microarray has limited resolution. Here we applied RNA sequencing (RNA-Seq) to identify gene signatures for heart failure from six individuals, including three controls, one ISCH and two DCM patients. Using genes identified from this small RNA-Seq dataset, we were able to accurately classify heart failure status in a much larger set of 313 individuals. The identified genes significantly overlapped with genes identified via genome-wide association studies for cardiometabolic traits and the promoters of those genes were enriched for binding sites for transcriptions factors. Our results indicate that it is possible to use RNA-Seq to classify disease status for complex diseases such as heart failure using an extremely small training dataset.

  View details for DOI 10.1016/j.ygeno.2014.12.002

  View details for Web of Science ID 000348840200003

  View details for PubMedID 25528681

• Using "big data" to dissect clinical heterogeneity. Circulation Altman, R. B., Ashley, E. A. 2015; 131 (3): 232-233

  View details for DOI 10.1161/CIRCULATIONAHA.114.014106

  View details for PubMedID 25601948

• Additive prognostic value of a cardiopulmonary exercise test score in patients with heart failure and intermediate risk INTERNATIONAL JOURNAL OF CARDIOLOGY Ritt, L. E., Myers, J., Stein, R., Arena, R., Guazzi, M., Chase, P., Bensimhon, D., Ashley, E., Cahalin, L. P., Forman, D. E. 2015; 178: 262?64

  View details for PubMedID 25464266

• Achieving high-sensitivity for clinical applications using augmented exome sequencing. Genome medicine Patwardhan, A., Harris, J., Leng, N., Bartha, G., Church, D. M., Luo, S., Haudenschild, C., Pratt, M., Zook, J., Salit, M., Tirch, J., Morra, M., Chervitz, S., Li, M., Clark, M., Garcia, S., Chandratillake, G., Kirk, S., Ashley, E., Snyder, M., Altman, R., Bustamante, C., Butte, A. J., West, J., Chen, R. 2015; 7 (1): 71-?

  Abstract

  Whole exome sequencing is increasingly used for the clinical evaluation of genetic disease, yet the variation of coverage and sensitivity over medically relevant parts of the genome remains poorly understood. Several sequencing-based assays continue to provide coverage that is inadequate for clinical assessment.Using sequence data obtained from the NA12878 reference sample and pre-defined lists of medically-relevant protein-coding and noncoding sequences, we compared the breadth and depth of coverage obtained among four commercial exome capture platforms and whole genome sequencing. In addition, we evaluated the performance of an augmented exome strategy, ACE, that extends coverage in medically relevant regions and enhances coverage in areas that are challenging to sequence. Leveraging reference call-sets, we also examined the effects of improved coverage on variant detection sensitivity.We observed coverage shortfalls with each of the conventional exome-capture and whole-genome platforms across several medically interpretable genes. These gaps included areas of the genome required for reporting recently established secondary findings (ACMG) and known disease-associated loci. The augmented exome strategy recovered many of these gaps, resulting in improved coverage in these areas. At clinically-relevant coverage levels (100 % bases covered at ?20×), ACE improved coverage among genes in the medically interpretable genome (>90 % covered relative to 10-78 % with other platforms), the set of ACMG secondary finding genes (91 % covered relative to 4-75 % with other platforms) and a subset of variants known to be associated with human disease (99 % covered relative to 52-95 % with other platforms). Improved coverage translated into improvements in sensitivity, with ACE variant detection sensitivities (>97.5 % SNVs, >92.5 % InDels) exceeding that observed with conventional whole-exome and whole-genome platforms.Clinicians should consider analytical performance when making clinical assessments, given that even a few missed variants can lead to reporting false negative results. An augmented exome strategy provides a level of coverage not achievable with other platforms, thus addressing concerns regarding the lack of sensitivity in clinically important regions. In clinical applications where comprehensive coverage of medically interpretable areas of the genome requires higher localized sequencing depth, an augmented exome approach offers both cost and performance advantages over other sequencing-based tests.

  View details for DOI 10.1186/s13073-015-0197-4

  View details for PubMedID 26269718

• Establishing disease causality for a novel gene variant in familial dilated cardiomyopathy using a functional in-vitro assay of regulated thin filaments and human cardiac myosin. BMC medical genetics Pan, S., Sommese, R. F., Sallam, K. I., Nag, S., Sutton, S., Miller, S. M., Spudich, J. A., Ruppel, K. M., Ashley, E. A. 2015; 16 (1): 97-?

  Abstract

  As next generation sequencing for the genetic diagnosis of cardiovascular disorders becomes more widely used, establishing causality for putative disease causing variants becomes increasingly relevant. Diseases of the cardiac sarcomere provide a particular challenge in this regard because of the complexity of assaying the effect of genetic variants in human cardiac contractile proteins.In this study we identified a novel variant R205Q in the cardiac troponin T gene (TNNT2). Carriers of the variant allele exhibited increased chamber volumes associated with decreased left ventricular ejection fraction. To clarify the causal role of this variant, we generated recombinant variant human protein and examined its calcium kinetics as well as the maximally activated ADP release of human ?-cardiac myosin with regulated thin filaments containing the mutant troponin T. We found that the R205Q mutation significantly decreased the calcium sensitivity of the thin filament by altering the effective calcium dissociation kinetics.The development of moderate throughput post-genomic assays is an essential step in the realization of the potential of next generation sequencing. Although technically challenging, biochemical and functional assays of human cardiac contractile proteins of the thin filament can be achieved and provide an orthogonal source of information to inform the question of causality for individual variants.

  View details for DOI 10.1186/s12881-015-0243-5

  View details for PubMedID 26498512

  View details for PubMedCentralID PMC4620603

• The right ventricle following ultra-endurance exercise: insights from novel echocardiography and 12-lead electrocardiography EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY Lord, R., Somauroo, J., Stembridge, M., Jain, N., Hoffman, M. D., George, K., Jones, H., Shave, R., Haddad, F., Ashley, E., Oxborough, D. 2015; 115 (1): 71-80

  Abstract

  There is contradictory evidence related to the impact of ultra-marathon running on right ventricular (RV) structure and function. Consequently, the aims of this study were to: (1) comprehensively assess RV structure and function before and immediately following a 100-mile ultra-marathon in highly trained runners, (2) determine the nature of RV recovery 6 h post-race, and (3) document 12-lead electrocardiogram (ECG) changes post-exercise.Echocardiography and 12-lead ECG were assessed in 15 competitors in a repeated measures design before and immediately after completion of the 2013 Western States Endurance Race. A subset of nine was reassessed 6 h into recovery. Standard echocardiography was used to determine RV size, function and wall stress. Myocardial speckle tracking (MST) provided peak, time to peak and temporal indices for RV longitudinal strain and strain rates (? and SR).RV size was increased post-race (inflow tract 14 %, outflow tract 11 %, P = 0.004 and 0.002). RV wall stress was elevated by 11 % post-race. Peak RV ? was reduced by 10 % (P = 0.007) and significantly delayed post-race (P = 0.008). Most changes in RV function persisted at the 6-h assessment. Post-race there was an increase in the prevalence of right-sided ECG changes.Completion of a 100-mile ultra-marathon resulted in acute changes in RV structure and function that persisted 6 h into recovery and are consistent with sustained exposure to an elevated RV wall stress. These findings were supported by right-sided changes to the 12-lead ECG.

  View details for DOI 10.1007/s00421-014-2995-6

  View details for Web of Science ID 000347293500004

  View details for PubMedID 25204280

• INHERIT (INHibition of the renin angiotensin system in hypertrophic cardiomyopathy and the Effect on hypertrophy-a Randomised Intervention Trial with losartan). Global cardiology science & practice Olivotto, I., Ashley, E. A. 2015; 2015: 7-?

  Abstract

  Early pharmacological interventions on transgenic models of hypertrophic cardiomyopathy (HCM) using angiotensin receptor blockers (ARBs) may be effective in preventing development of clinical phenotype or causing phenotype regression in early stages of disease. In the clinical setting, however, the effects of ARBs on HCM phenotype have been less consistent. INHERIT (INHibition of the renin angiotensin system in hypertrophic cardiomyopathy and the Effect on hypertrophy-a Randomised Intervention Trial with losartan) was designed to assess the effect of 100 mg of losartan in promoting the regression of LV hypertrophy in HCM. The primary end-point of the study was the reduction in LV mass assessed by MRI or computed tomography. After 12 months, no reduction in LV mass was observed in the losartan arm, and there was no difference in LV mass change with the placebo arm. The same was true for all secondary endpoints. The implications of these findings are discussed in the light of further, ongoing study targeting the HCM phenotype.

  View details for DOI 10.5339/gcsp.2015.7

  View details for PubMedID 25830151

  View details for PubMedCentralID PMC4374100

• Personalized preventive medicine: genetics and the response to regular exercise in preventive interventions. Progress in cardiovascular diseases Bouchard, C., Antunes-Correa, L. M., Ashley, E. A., Franklin, N., Hwang, P. M., Mattsson, C. M., Negrao, C. E., Phillips, S. A., Sarzynski, M. A., Wang, P., Wheeler, M. T. 2015; 57 (4): 337-346

  Abstract

  Regular exercise and a physically active lifestyle have favorable effects on health. Several issues related to this theme are addressed in this report. A comment on the requirements of personalized exercise medicine and in-depth biological profiling along with the opportunities that they offer is presented. This is followed by a brief overview of the evidence for the contributions of genetic differences to the ability to benefit from regular exercise. Subsequently, studies showing that mutations in TP53 influence exercise capacity in mice and humans are succinctly described. The evidence for effects of exercise on endothelial function in health and disease also is covered. Finally, changes in cardiac and skeletal muscle in response to exercise and their implications for patients with cardiac disease are summarized. Innovative research strategies are needed to define the molecular mechanisms involved in adaptation to exercise and to translate them into useful clinical and public health applications.

  View details for DOI 10.1016/j.pcad.2014.08.005

  View details for PubMedID 25559061

• Clinical Phenotype and Outcome of Hypertrophic Cardiomyopathy Associated With Thin-Filament Gene Mutations JOURNAL OF THE AMERICAN COLLEGE OF CARDIOLOGY Coppini, R., Ho, C. Y., Ashley, E., Day, S., Ferrantini, C., Girolami, F., Tomberli, B., Bardi, S., Torricelli, F., Cecchi, F., Mugelli, A., Poggesi, C., Tardiff, J., Olivotto, I. 2014; 64 (24): 2589-2600

  Abstract

  Mild hypertrophy but increased arrhythmic risk characterizes the stereotypic phenotype proposed for hypertrophic cardiomyopathy (HCM) caused by thin-filament mutations. However, whether such clinical profile is different from more prevalent thick-filament-associated disease is unresolved.This study aimed to assess clinical features and outcomes in a large cohort of patients with HCM associated with thin-filament mutations compared with thick-filament HCM.Adult HCM patients (age >18 years), 80 with thin-filament and 150 with thick-filament mutations, were followed for an average of 4.5 years.Compared with thick-filament HCM, patients with thin-filament mutations showed: 1) milder and atypically distributed left ventricular (LV) hypertrophy (maximal wall thickness 18 ± 5 mm vs. 24 ± 6 mm; p < 0.001) and less prevalent outflow tract obstruction (19% vs. 34%; p = 0.015); 2) higher rate of progression to New York Heart Association functional class III or IV (15% vs. 5%; p = 0.013); 3) higher prevalence of systolic dysfunction or restrictive LV filling at last evaluation (20% vs. 9%; p = 0.038); 4) 2.4-fold increase in prevalence of triphasic LV filling pattern (26% vs. 11%; p = 0.002); and 5) similar rates of malignant ventricular arrhythmias and sudden cardiac death (p = 0.593).In adult HCM patients, thin-filament mutations are associated with increased likelihood of advanced LV dysfunction and heart failure compared with thick-filament disease, whereas arrhythmic risk in both subsets is comparable. Triphasic LV filling is particularly common in thin-filament HCM, reflecting profound diastolic dysfunction.

  View details for DOI 10.1016/j.jacc.2014.09.059

  View details for Web of Science ID 000346349300006

  View details for PubMedID 25524337

  View details for PubMedCentralID PMC4270453

• Oxido-reductive regulation of vascular remodeling by receptor tyrosine kinase ROS1 JOURNAL OF CLINICAL INVESTIGATION Ali, Z. A., Perez, V. D., Yuan, K., Orcholski, M., Pan, S., Qi, W., Chopra, G., Adams, C., Kojima, Y., Leeper, N. J., Qu, X., Zaleta-Rivera, K., Kato, K., Yamada, Y., Oguri, M., Kuchinsky, A., Hazen, S. L., Jukema, J. W., Ganesh, S. K., Nabe, E. G., Channon, K., Leon, M. B., Charest, A., Quertermous, T., Ashley, E. A. 2014; 124 (12): 5159-5174

  Abstract

  Angioplasty and stenting is the primary treatment for flow-limiting atherosclerosis; however, this strategy is limited by pathological vascular remodeling. Using a systems approach, we identified a role for the network hub gene glutathione peroxidase-1 (GPX1) in pathological remodeling following human blood vessel stenting. Constitutive deletion of Gpx1 in atherosclerotic mice recapitulated this phenotype of increased vascular smooth muscle cell (VSMC) proliferation and plaque formation. In an independent patient cohort, gene variant pair analysis identified an interaction of GPX1 with the orphan protooncogene receptor tyrosine kinase ROS1. A meta-analysis of the only genome-wide association studies of human neointima-induced in-stent stenosis confirmed the association of the ROS1 variant with pathological remodeling. Decreased GPX1 expression in atherosclerotic mice led to reductive stress via a time-dependent increase in glutathione, corresponding to phosphorylation of the ROS1 kinase activation site Y2274. Loss of GPX1 function was associated with both oxidative and reductive stress, the latter driving ROS1 activity via s-glutathiolation of critical residues of the ROS1 tyrosine phosphatase SHP-2. ROS1 inhibition with crizotinib and deglutathiolation of SHP-2 abolished GPX1-mediated increases in VSMC proliferation while leaving endothelialization intact. Our results indicate that GPX1-dependent alterations in oxido-reductive stress promote ROS1 activation and mediate vascular remodeling.

  View details for DOI 10.1172/JCI77484

  View details for Web of Science ID 000345677200011

  View details for PubMedID 25401476

• Assessing the Impact of False Positive and False Negative Variant Calls on Clinical Genome Interpretation Zook, J. M., Goldfeder, R., Priest, J., Grove, M., Wheeler, M., Ashley, E., Salit, M. ELSEVIER SCIENCE INC. 2014: 711

  View details for Web of Science ID 000343794200066

• A long noncoding RNA protects the heart from pathological hypertrophy. Nature Han, P., Li, W., Lin, C., Yang, J., Shang, C., Nurnberg, S. T., Jin, K. K., Xu, W., Lin, C., Lin, C., Xiong, Y., Chien, H., Zhou, B., Ashley, E., Bernstein, D., Chen, P., Chen, H. V., Quertermous, T., Chang, C. 2014; 514 (7520): 102-106

  Abstract

  The role of long noncoding RNA (lncRNA) in adult hearts is unknown; also unclear is how lncRNA modulates nucleosome remodelling. An estimated 70% of mouse genes undergo antisense transcription, including myosin heavy chain 7 (Myh7), which encodes molecular motor proteins for heart contraction. Here we identify a cluster of lncRNA transcripts from Myh7 loci and demonstrate a new lncRNA-chromatin mechanism for heart failure. In mice, these transcripts, which we named myosin heavy-chain-associated RNA transcripts (Myheart, or Mhrt), are cardiac-specific and abundant in adult hearts. Pathological stress activates the Brg1-Hdac-Parp chromatin repressor complex to inhibit Mhrt transcription in the heart. Such stress-induced Mhrt repression is essential for cardiomyopathy to develop: restoring Mhrt to the pre-stress level protects the heart from hypertrophy and failure. Mhrt antagonizes the function of Brg1, a chromatin-remodelling factor that is activated by stress to trigger aberrant gene expression and cardiac myopathy. Mhrt prevents Brg1 from recognizing its genomic DNA targets, thus inhibiting chromatin targeting and gene regulation by Brg1. It does so by binding to the helicase domain of Brg1, a domain that is crucial for tethering Brg1 to chromatinized DNA targets. Brg1 helicase has dual nucleic-acid-binding specificities: it is capable of binding lncRNA (Mhrt) and chromatinized--but not naked--DNA. This dual-binding feature of helicase enables a competitive inhibition mechanism by which Mhrt sequesters Brg1 from its genomic DNA targets to prevent chromatin remodelling. A Mhrt-Brg1 feedback circuit is thus crucial for heart function. Human MHRT also originates from MYH7 loci and is repressed in various types of myopathic hearts, suggesting a conserved lncRNA mechanism in human cardiomyopathy. Our studies identify a cardioprotective lncRNA, define a new targeting mechanism for ATP-dependent chromatin-remodelling factors, and establish a new paradigm for lncRNA-chromatin interaction.

  View details for DOI 10.1038/nature13596

  View details for PubMedID 25119045

• Molecular diagnosis of long QT syndrome at 10 days of life by rapid whole genome sequencing HEART RHYTHM Priest, J. R., Ceresnak, S. R., Dewey, F. E., Malloy-Walton, L. E., Dunn, K., Grove, M. E., Perez, M. V., Maeda, K., Dubin, A. M., Ashley, E. A. 2014; 11 (10): 1707-1713

  Abstract

  The advent of clinical next generation sequencing is rapidly changing the landscape of rare disease medicine. Molecular diagnosis of long QT syndrome (LQTS) can impact clinical management, including risk stratification and selection of pharmacotherapy based on the type of ion channel affected, but results from current gene panel testing requires 4 to 16 weeks before return to clinicians.A term female infant presented with 2:1 atrioventricular block and ventricular arrhythmias consistent with perinatal LQTS, requiring aggressive treatment including epicardial pacemaker, and cardioverter-defibrillator implantation and sympathectomy on day of life two. We sought to provide a rapid molecular diagnosis for optimization of treatment strategies.We performed CLIA-certified rapid whole genome sequencing (WGS) with a speed-optimized bioinformatics platform to achieve molecular diagnosis at 10 days of life.We detected a known pathogenic variant in KCNH2 that was demonstrated to be paternally inherited by followup genotyping. The unbiased assessment of the entire catalog of human genes provided by whole genome sequencing revealed a maternally inherited variant of unknown significance in a novel gene.Rapid clinical WGS provides faster and more comprehensive diagnostic information by 10 days of life than standard gene-panel testing. In selected clinical scenarios such as perinatal LQTS, rapid WGS may be able to provide more timely and clinically actionable information than a standard commercial test.

  View details for DOI 10.1016/j.hrthm.20l4.06.030

  View details for Web of Science ID 000343112200012

• Genomics in clinical practice HEART Priest, J. R., Ashley, E. A. 2014; 100 (20): 1569?70

  View details for DOI 10.1136/heartjnl-2014-306111

  View details for Web of Science ID 000343232400004

  View details for PubMedID 25063760

  View details for PubMedCentralID PMC5603306

• Stable, Covalent Attachment of Laminin to Microposts Improves the Contractility of Mouse Neonatal Cardiomyocytes ACS APPLIED MATERIALS & INTERFACES Ribeiro, A. J., Zaleta-Rivera, K., Ashley, E. A., Pruitt, B. L. 2014; 6 (17): 15516-15526

  Abstract

  The mechanical output of contracting cardiomyocytes, the muscle cells of the heart, relates to healthy and disease states of the heart. Culturing cardiomyocytes on arrays of elastomeric microposts can enable inexpensive and high-throughput studies of heart disease at the single-cell level. However, cardiomyocytes weakly adhere to these microposts, which limits the possibility of using biomechanical assays of single cardiomyocytes to study heart disease. We hypothesized that a stable covalent attachment of laminin to the surface of microposts improves cardiomyocyte contractility. We cultured cells on polydimethylsiloxane microposts with laminin covalently bonded with the organosilanes 3-glycidoxypropyltrimethoxysilane and 3-aminopropyltriethoxysilane with glutaraldehyde. We measured displacement of microposts induced by the contractility of mouse neonatal cardiomyocytes, which attach better than mature cardiomyocytes to substrates. We observed time-dependent changes in contractile parameters such as micropost deformation, contractility rates, contraction and relaxation speeds, and the times of contractions. These parameters were affected by the density of laminin on microposts and by the stability of laminin binding to micropost surfaces. Organosilane-mediated binding resulted in higher laminin surface density and laminin binding stability. 3-glycidoxypropyltrimethoxysilane provided the highest laminin density but did not provide stable protein binding with time. Higher surface protein binding stability and strength were observed with 3-aminopropyltriethoxysilane with glutaraldehyde. In cultured cardiomyocytes, contractility rate, contraction speeds, and contraction time increased with higher laminin stability. Given these variations in contractile function, we conclude that binding of laminin to microposts via 3-aminopropyltriethoxysilane with glutaraldehyde improves contractility observed by an increase in beating rate and contraction speed as it occurs during the postnatal maturation of cardiomyocytes. This approach is promising for future studies to mimic in vivo tissue environments.

  View details for Web of Science ID 000341544200092

  View details for PubMedCentralID PMC4160263

• Stable, covalent attachment of laminin to microposts improves the contractility of mouse neonatal cardiomyocytes. ACS applied materials & interfaces Ribeiro, A. J., Zaleta-Rivera, K., Ashley, E. A., Pruitt, B. L. 2014; 6 (17): 15516-15526

  Abstract

  The mechanical output of contracting cardiomyocytes, the muscle cells of the heart, relates to healthy and disease states of the heart. Culturing cardiomyocytes on arrays of elastomeric microposts can enable inexpensive and high-throughput studies of heart disease at the single-cell level. However, cardiomyocytes weakly adhere to these microposts, which limits the possibility of using biomechanical assays of single cardiomyocytes to study heart disease. We hypothesized that a stable covalent attachment of laminin to the surface of microposts improves cardiomyocyte contractility. We cultured cells on polydimethylsiloxane microposts with laminin covalently bonded with the organosilanes 3-glycidoxypropyltrimethoxysilane and 3-aminopropyltriethoxysilane with glutaraldehyde. We measured displacement of microposts induced by the contractility of mouse neonatal cardiomyocytes, which attach better than mature cardiomyocytes to substrates. We observed time-dependent changes in contractile parameters such as micropost deformation, contractility rates, contraction and relaxation speeds, and the times of contractions. These parameters were affected by the density of laminin on microposts and by the stability of laminin binding to micropost surfaces. Organosilane-mediated binding resulted in higher laminin surface density and laminin binding stability. 3-glycidoxypropyltrimethoxysilane provided the highest laminin density but did not provide stable protein binding with time. Higher surface protein binding stability and strength were observed with 3-aminopropyltriethoxysilane with glutaraldehyde. In cultured cardiomyocytes, contractility rate, contraction speeds, and contraction time increased with higher laminin stability. Given these variations in contractile function, we conclude that binding of laminin to microposts via 3-aminopropyltriethoxysilane with glutaraldehyde improves contractility observed by an increase in beating rate and contraction speed as it occurs during the postnatal maturation of cardiomyocytes. This approach is promising for future studies to mimic in vivo tissue environments.

  View details for DOI 10.1021/am5042324

  View details for PubMedID 25133578

• RV remodeling in college athletes engaged in mixed strength and endurance training: do the current echocardiographic reference values apply? Finocchiaro, G., Knowles, J. W., Perez, M., Schnittger, I., Magavern, E., Puryear, J., Sinagra, G., Froelicher, V., Ashley, E., Haddad, F. OXFORD UNIV PRESS. 2014: 729?30

  View details for Web of Science ID 000343001304294

• Impact of latent obstruction on exercise tolerance in hypertrophic cardiomyopathy Finocchiaro, G., Haddad, F., Knowles, J. W., Pavlovic, A., Sinagra, G., Magavern, E., Wong, M., Myers, J., Froelicher, V., Ashley, E. A. OXFORD UNIV PRESS. 2014: 927

  View details for Web of Science ID 000343001305289

• Predominance of normal left ventricular geometry in the male 'athlete's heart' HEART Utomi, V., Oxborough, D., Ashley, E., Lord, R., Fletcher, S., Stembridge, M., Shave, R., Hoffman, M. D., Whyte, G., Somauroo, J., Sharma, S., George, K. 2014; 100 (16): 1264-?

  Abstract

  This study evaluated (a) global LV adaption to endurance versus resistance training in male athletes, (b) LV assessment using by modern imaging technologies and (c) the impact of scaling for body size on LV structural data.A prospective cross-sectional design assessed the LV in 18 elite endurance-trained (ET), 19 elite resistance-trained (RT) and 17 sedentary control (CT) participants. Standard 2D, tissue Doppler and speckle tracking echocardiography assessed LV structure and function. Indexing of LV structures to body surface area (BSA) was undertaken using ratio and allometric scaling.Absolute and scaled LV end-diastolic volume (ET: 43.7±6.8; RT: 34.2±7.4; CT 32.5±8.9?mL/m(1.5); p<0.05) and LV mass (ET: 29.8±6.6; RT: 25.4±8.7; CT 25.9±6.4?g/m(2.7); p?

  View details for DOI 10.1136/heartjnl-2014-305904

  View details for PubMedID 24916049

• Interpreting whole-genome sequencing--reply. JAMA Dewey, F., Ashley, E., Quertermous, T. 2014; 312 (3): 296-297

  View details for DOI 10.1001/jama.2014.6605

  View details for PubMedID 25027152

• Whole-Exome Sequencing Reveals TopBP1 as a Novel Gene in Idiopathic Pulmonary Arterial Hypertension AMERICAN JOURNAL OF RESPIRATORY AND CRITICAL CARE MEDICINE Perez, V. A., Yuan, K., Lyuksyutova, M. A., Dewey, F., Orcholski, M. E., Shuffle, E. M., Mathur, M., Yancy, L., Rojas, V., Li, C. G., Cao, A., Alastalo, T., Khazeni, N., Cimprich, K. A., Butte, A. J., Ashley, E., Zamanian, R. T. 2014; 189 (10): 1260-1272

  Abstract

  Idiopathic pulmonary arterial hypertension (IPAH) is a life-threatening disorder characterized by progressive loss of pulmonary microvessels. Although mutations in the bone morphogenetic receptor 2 (BMPR2) are found in 80% of heritable and ?15% of patients with IPAH, their low penetrance (?20%) suggests that other unidentified genetic modifiers are required for manifestation of the disease phenotype. Use of whole-exome sequencing (WES) has recently led to the discovery of novel susceptibility genes in heritable PAH, but whether WES can also accelerate gene discovery in IPAH remains unknown.To determine whether WES can help identify novel gene modifiers in patients with IPAH.Exome capture and sequencing was performed on genomic DNA isolated from 12 unrelated patients with IPAH lacking BMPR2 mutations. Observed genetic variants were prioritized according to their pathogenic potential using ANNOVAR.A total of nine genes were identified as high-priority candidates. Our top hit was topoisomerase DNA binding II binding protein 1 (TopBP1), a gene involved in the response to DNA damage and replication stress. We found that TopBP1 expression was reduced in vascular lesions and pulmonary endothelial cells isolated from patients with IPAH. Although TopBP1 deficiency made endothelial cells susceptible to DNA damage and apoptosis in response to hydroxyurea, its restoration resulted in less DNA damage and improved cell survival.WES led to the discovery of TopBP1, a gene whose deficiency may increase susceptibility to small vessel loss in IPAH. We predict that use of WES will help identify gene modifiers that influence an individual's risk of developing IPAH.

  View details for DOI 10.1164/rccm.201310-17490C

  View details for Web of Science ID 000336017200018

  View details for PubMedID 24702692

  View details for PubMedCentralID PMC4225850

• Latent obstruction and left atrial size are predictors of clinical deterioration leading to septal reduction in hypertrophic cardiomyopathy. Journal of cardiac failure Finocchiaro, G., Haddad, F., Pavlovic, A., Sinagra, G., Schnittger, I., Knowles, J. W., Perez, M., Magavern, E., Myers, J., Ashley, E. 2014; 20 (4): 236-243

  Abstract

  Exercise echocardiography is a reliable tool to assess left ventricular (LV) dynamic obstruction in hypertrophic cardiomyopathy (HCM). The aim of this study was to determine the role of exercise echocardiography in the evaluation of latent obstruction and in predicting clinical deterioration in HCM patients.We considered 283 HCM patients studied with exercise echocardiography. The end point was clinical deterioration leading to septal reduction (myectomy or alcohol septal ablation). LV latent obstruction was present at enrollment in 67 patients (24%). During a mean follow-up of 42 ± 31 months, 42 patients had clinical deterioration leading to septal reduction therapy: in 12/67 (22%) patients with a latent obstruction at enrollment, in 28/84 (33%) patients with obstruction at rest, and in 2/132 (1.5%) with obstruction neither at rest or during stress. Multivariate analysis identified the following variables as independently associated with the end point: LV gradient >30 mm Hg at rest (hazard ratio [HR] 2.56, 95% CI 1.27-5.14; P = .009), LV gradient >30 mm Hg during stress (HR 4.96, 95% CI 1.81-13.61; P = .002), and indexed left atrial volume (LAVi ) >40 mL/m(2) (HR 2.86, 95% CI 1.47-5.55; P = .002). In patients with a latent obstruction, the strongest independent predictor of outcome was LAVi >40 mL/m(2) (HR 3.75, 95% CI 1.12-12.51; P = .032).Assessment of LV gradient during stress with exercise echocardiography is an important tool for the evaluation of latent obstruction in HCM and may have a role in risk stratification of these patients.

  View details for DOI 10.1016/j.cardfail.2014.01.014

  View details for PubMedID 24486928

• Exercise capacity and paroxysmal atrial fibrillation in patients with hypertrophic cardiomyopathy. Heart Azarbal, F., Singh, M., Finocchiaro, G., Le, V., Schnittger, I., Wang, P., Myers, J., Ashley, E., Perez, M. 2014; 100 (8): 624-630

  Abstract

  Atrial fibrillation (AF) is the most common arrhythmia among patients with hypertrophic cardiomyopathy (HCM). The relationship between paroxysmal AF and exercise capacity in this population is incompletely understood.Patients with HCM underwent symptom-limited cardiopulmonary testing with expired gas analysis at Stanford Hospital between October 2006 and October 2012. Baseline demographics, medical histories and resting echocardiograms were obtained for all subjects. Diagnosis of AF was established by review of medical records and baseline ECG. Those with paroxysmal AF were in sinus rhythm at the time of cardiopulmonary testing with expired gas analysis. Exercise intolerance was defined as peak VO2<20 mL/kg/min. We used multivariate logistic regression to evaluate the association between exercise intolerance and paroxysmal AF.Among the 265 patients recruited, 55 had AF (28 paroxysmal and 27 permanent). Compared with those without AF, subjects with paroxysmal AF were older, more likely to use antiarrhythmic and anticoagulant medications, and had larger left atria. Patients with paroxysmal AF achieved lower peak VO2 (21.9±9.2 mL/kg/min vs 26.9±10.8 mL/kg/min, p=0.02) and were more likely to have exercise intolerance (61% vs 28%, p<0.001) compared with those without AF. After adjustment for age, sex and body mass index (BMI) exercise intolerance remained significantly associated with paroxysmal AF (OR 4.65, 95% CI 1.83 to 11.83, p=0.001).Patients with HCM and paroxysmal AF demonstrate exercise intolerance despite being in sinus rhythm at the time of exercise testing.

  View details for DOI 10.1136/heartjnl-2013-304908

  View details for PubMedID 24326897

• Clinical interpretation and implications of whole-genome sequencing. JAMA : the journal of the American Medical Association Dewey, F. E., Grove, M. E., Pan, C., Goldstein, B. A., Bernstein, J. A., Chaib, H., Merker, J. D., Goldfeder, R. L., Enns, G. M., David, S. P., Pakdaman, N., Ormond, K. E., Caleshu, C., Kingham, K., Klein, T. E., Whirl-Carrillo, M., Sakamoto, K., Wheeler, M. T., Butte, A. J., Ford, J. M., Boxer, L., Ioannidis, J. P., Yeung, A. C., Altman, R. B., Assimes, T. L., Snyder, M., Ashley, E. A., Quertermous, T. 2014; 311 (10): 1035-1045

  Abstract

  Whole-genome sequencing (WGS) is increasingly applied in clinical medicine and is expected to uncover clinically significant findings regardless of sequencing indication.To examine coverage and concordance of clinically relevant genetic variation provided by WGS technologies; to quantitate inherited disease risk and pharmacogenomic findings in WGS data and resources required for their discovery and interpretation; and to evaluate clinical action prompted by WGS findings.An exploratory study of 12 adult participants recruited at Stanford University Medical Center who underwent WGS between November 2011 and March 2012. A multidisciplinary team reviewed all potentially reportable genetic findings. Five physicians proposed initial clinical follow-up based on the genetic findings.Genome coverage and sequencing platform concordance in different categories of genetic disease risk, person-hours spent curating candidate disease-risk variants, interpretation agreement between trained curators and disease genetics databases, burden of inherited disease risk and pharmacogenomic findings, and burden and interrater agreement of proposed clinical follow-up.Depending on sequencing platform, 10% to 19% of inherited disease genes were not covered to accepted standards for single nucleotide variant discovery. Genotype concordance was high for previously described single nucleotide genetic variants (99%-100%) but low for small insertion/deletion variants (53%-59%). Curation of 90 to 127 genetic variants in each participant required a median of 54 minutes (range, 5-223 minutes) per genetic variant, resulted in moderate classification agreement between professionals (Gross ?, 0.52; 95% CI, 0.40-0.64), and reclassified 69% of genetic variants cataloged as disease causing in mutation databases to variants of uncertain or lesser significance. Two to 6 personal disease-risk findings were discovered in each participant, including 1 frameshift deletion in the BRCA1 gene implicated in hereditary breast and ovarian cancer. Physician review of sequencing findings prompted consideration of a median of 1 to 3 initial diagnostic tests and referrals per participant, with fair interrater agreement about the suitability of WGS findings for clinical follow-up (Fleiss ?, 0.24; P?

  View details for DOI 10.1001/jama.2014.1717

  View details for PubMedID 24618965

  View details for PubMedCentralID PMC4119063

• Unexplained double-chambered left ventricle associated with contracting right ventricular aneurysm and right atrial enlargement. Echocardiography (Mount Kisco, N.Y.) Finocchiaro, G., Murphy, D., Pavlovic, A., Haddad, F., Shiran, H., Sinagra, G., Ashley, E. A., Knowles, J. W. 2014; 31 (3): E80-4

  Abstract

  In this article, we describe a double-chambered left ventricle (LV) associated with a functional right ventricular (RV) aneurysm and right atrial (RA) enlargement in an asymptomatic 24-year-old woman with a family history of sudden cardiac death. We will discuss the differential diagnosis, genetic testing and possible prognostic implications.

  View details for DOI 10.1111/echo.12467

  View details for PubMedID 24299065

• Unexplained double-chambered left ventricle associated with contracting right ventricular aneurysm and right atrial enlargement. Echocardiography (Mount Kisco, N.Y.) Finocchiaro, G., Murphy, D., Pavlovic, A., Haddad, F., Shiran, H., Sinagra, G., Ashley, E. A., Knowles, J. W. 2014; 31 (3): E80-4

  View details for DOI 10.1111/echo.12467

  View details for PubMedID 24299065

• A neural network approach to predicting outcomes in heart failure using cardiopulmonary exercise testing INTERNATIONAL JOURNAL OF CARDIOLOGY Myers, J., de Souza, C. R., Borghi-Silva, A., Guazzi, M., Chase, P., Bensimhon, D., Peberdy, M. A., Ashley, E., West, E., Cahalin, L. P., Forman, D., Arena, R. 2014; 171 (2): 265-269

  Abstract

  To determine the utility of an artificial neural network (ANN) in predicting cardiovascular (CV) death in patients with heart failure (HF).ANNs use weighted inputs in multiple layers of mathematical connections in order to predict outcomes from multiple risk markers. This approach has not been applied in the context of cardiopulmonary exercise testing (CPX) to predict risk in patients with HF.2635 patients with HF underwent CPX and were followed for a mean of 29±30months. The sample was divided randomly into ANN training and testing sets to predict CV mortality. Peak VO2, VE/VCO2 slope, heart rate recovery, oxygen uptake efficiency slope, and end-tidal CO2 pressure were included in the model. The predictive accuracy of the ANN was compared to logistic regression (LR) and a Cox proportional hazards (PH) score. A multi-layer feed-forward ANN was used and was tested with a single hidden layer containing a varying number of hidden neurons.There were 291 CV deaths during the follow-up. An abnormal VE/VCO2 slope was the strongest predictor of CV mortality using conventional PH analysis (hazard ratio 3.04; 95% CI 2.2-4.2, p<0.001). After training, the ANN was more accurate in predicting CV mortality compared to LR and PH; ROC areas for the ANN, LR, and PH models were 0.72, 0.70, and 0.69, respectively. Age and BMI-adjusted odds ratios were 4.2, 2.6, and 2.9, for ANN, LR, and PH, respectively.An ANN model slightly improves upon conventional methods for estimating CV mortality risk using established CPX responses.

  View details for DOI 10.1016/j.ijcard.2013.12.031

  View details for Web of Science ID 000329982200047

  View details for PubMedID 24387896

• Patterns and prognosis of all components of the J-wave pattern in multiethnic athletes and ambulatory patients. American heart journal Muramoto, D., Yong, C. M., Singh, N., Aggarwal, S., Perez, M., Ashley, E., Hadley, D., Froelicher, V. 2014; 167 (2): 259-266

  Abstract

  Despite recent concern about the significance of the J-wave pattern (also often referred to as early repolarization) and the importance of screening in athletes, there are limited rigorous prognostic data characterizing the 3 components of the J-wave pattern (ST elevation, J waves, and QRS slurs). We aim to assess the prevalence, patterns, and prognosis of the J-wave pattern among both stable clinical and athlete populations.We retrospectively studied 4,041 electrocardiograms from a multiethnic clinical population from 1997 to 1999 at the Veterans Affairs Palo Alto Health Care System. We also examined preparticipation electrocardiograms of 1,114 Stanford University varsity athletes from 2007 to 2008. Strictly defined criteria for components of the J-wave pattern were examined. In clinical subjects, prognosis was assessed using the end point of cardiovascular death after 7 years of follow-up.Components of the J-wave pattern were most prevalent in males; African Americans; and, particularly, athletes, with the greatest variations demonstrated in the lateral leads. ST elevation was the most common. Inferior J waves and slurs, previously linked to cardiovascular risk, were observed in 9.6% of clinical subjects and 12.3% of athletes. J waves, slurs, or ST elevation was not associated with time to cardiovascular death in clinical subjects, and ST-segment slope abnormalities were not prevalent enough in conjunction with them to reach significance.J waves, slurs, or ST elevation was not associated with increased hazard of cardiovascular death in our large multiethnic, ambulatory population. Even subsets of J-wave patterns, recently proposed to pose a risk of arrhythmic death, occurred at such a high prevalence as to negate their utility in screening.

  View details for DOI 10.1016/j.ahj.2013.10.027

  View details for PubMedID 24439988

• Contractility of Neonatal Cardiomyocytes is Altered with Different Densities of Laminin Covalently Attached to Microposts Ribeiro, A. S., Zaleta-Rivera, K., Ashley, E. A., Pruitt, B. L. CELL PRESS. 2014: 211A

  View details for DOI 10.1016/j.bpj.2013.11.1237

  View details for Web of Science ID 000337000401180

• Prevalence and clinical correlates of right ventricular dysfunction in patients with hypertrophic cardiomyopathy. American journal of cardiology Finocchiaro, G., Knowles, J. W., Pavlovic, A., Perez, M., Magavern, E., Sinagra, G., Haddad, F., Ashley, E. A. 2014; 113 (2): 361-367

  Abstract

  Hypertrophic cardiomyopathy (HC) is a disease that mainly affects the left ventricle (LV), however recent studies have suggested that it can also be associated with right ventricular (RV) dysfunction. The objective of this study was to determine the prevalence of RV dysfunction in patients with HC and its relation with LV function and outcome. A total of 324 consecutive patients with HC who received care at Stanford Hospital from 1999 to 2012 were included in the study. A group of 99 prospectively recruited age- and gender-matched healthy volunteers were used as controls. RV function was quantified using the RV fractional area change, tricuspid annular plane systolic excursion (TAPSE), and RV myocardial performance index (RVMPI). Compared with the controls, the patients with HC had a higher RVMPI (0.51 ± 0.18 vs 0.25 ± 0.06, p <0.001) and lower TAPSE (20 ± 3 vs 24 ± 4, p <0.001). RV dysfunction based on an RVMPI >0.4 and TAPSE <16 mm was found in 71% and 11% of the HC and control groups, respectively. Worst LV function and greater pulmonary pressures were independent correlates of RV dysfunction. At an average follow-up of 3.7 ± 2.3 years, 17 patients had died and 4 had undergone heart transplantation. LV ejection fraction <50% and TAPSE <16 mm were independent correlates of outcome (hazard ratio 3.98, 95% confidence interval 1.22 to 13.04, p = 0.02; and hazard ratio 3.66, 95% confidence interval 1.38 to 9.69, p = 0.009, respectively). In conclusion, RV dysfunction based on the RVMPI is common in patients with HC and more frequently observed in patients with LV dysfunction and pulmonary hypertension. RV dysfunction based on the TAPSE was independently associated with an increased likelihood of death or transplantation.

  View details for DOI 10.1016/j.amjcard.2013.09.045

  View details for PubMedID 24230980

• Rat model of veno-arterial extracorporeal membrane oxygenation. Journal of translational medicine Ali, A. A., Downey, P., Singh, G., Qi, W., George, I., Takayama, H., Kirtane, A., Krishnan, P., Zalewski, A., Freed, D., Large, S. R., Ashley, E. A., Leon, M. B., Bacchetta, M., Ali, Z. A. 2014; 12: 37-?

  Abstract

  We aim to develop a rat model of veno-arterial extracorporeal membrane oxygenation (VA-ECMO).VA-ECMO was established in twelve Male Sprague-Dawley rats (250-350 g) through cannulation of the right jugular vein for venous drainage and the right femoral artery for arterial reinfusion. Arterial blood pressure was measured using a conductance catheter through cannulation of the left carotid artery. Heart rate was monitored by electrocardiography and arterial blood gas parameters with a blood gas analyzer. The VA-ECMO circuit was tested by subjecting the rats to hypoxic cardiac arrest with resuscitation using VA-ECMO. Both load-dependent and load-independent measures of myocardial contractility were measured using pressure-volume loop analysis to confirm restoration of myocardial function post-resuscitation.Following hypoxic cardiac arrest VA-ECMO provided sufficient oxygenation to support the circulation. The haemodynamic and blood gas parameters were maintained at transition and during ECMO. All animals were resuscitated, regained cardiac function and were able to be weaned off ECMO post-resuscitation.We have established a safe, high-throughput, economical, functioning rat model of VA-ECMO.

  View details for DOI 10.1186/1479-5876-12-37

  View details for PubMedID 24507588

  View details for PubMedCentralID PMC3925959

• Loss Of Carboxylesterase 1 Activity Is Associated With Reduced Bone Morphogenetic Protein Receptor 2 Activity And Membrane Localization In Pulmonary Endothelial Cells Aurora, R., Orcholski, M., Khurshudyan, A., Dewey, F., Ashley, E., Morriseau, C., Hammock, B., Zamanian, R. T., Perez, V. AMER THORACIC SOC. 2014

  View details for Web of Science ID 000209838205184

• Carboxylesterase 1, A Novel Candidate Gene In Pulmonary Arterial Hypertension, Protects The Pulmonary Endothelium Against Methamphetamine-Mediated Injury Orcholski, M., Khurshudyan, A., Morriseau, C., Dewey, F., Ashley, E., Hammock, B., Zamanian, R. T., Perez, V. AMER THORACIC SOC. 2014

  View details for Web of Science ID 000209838205174

• Identification of a New Target of miR-16, Vacuolar Protein Sorting 4a. PloS one Adhikari, N., Guan, W., Capaldo, B., Mackey, A. J., Carlson, M., Ramakrishnan, S., Walek, D., Gupta, M., Mitchell, A., Eckman, P., John, R., Ashley, E., Barton, P. J., Hall, J. L. 2014; 9 (7)

  View details for DOI 10.1371/journal.pone.0101509

  View details for PubMedID 25033200

• Identification of a new target of miR-16, Vacuolar Protein Sorting 4a. PloS one Adhikari, N., Guan, W., Capaldo, B., Mackey, A. J., Carlson, M., Ramakrishnan, S., Walek, D., Gupta, M., Mitchell, A., Eckman, P., John, R., Ashley, E., Barton, P. J., Hall, J. L. 2014; 9 (7)

  Abstract

  The rationale was to utilize a bioinformatics approach to identify miRNA binding sites in genes with single nucleotide mutations (SNPs) to discover pathways in heart failure (HF).The objective was to focus on the genes containing miRNA binding sites with miRNAs that were significantly altered in end-stage HF and in response to a left ventricular assist device (LVAD).BEDTools v2.14.3 was used to discriminate SNPs within predicted 3'UTR miRNA binding sites. A member of the miR-15/107 family, miR-16, was decreased in the circulation of end-stage HF patients and increased in response to a LVAD (p<0.001). MiR-16 decreased Vacuolar Protein Sorting 4a (VPS4a) expression in HEK 293T cells (p<0.01). The SNP rs16958754 was identified in the miR-15/107 family binding site of VPS4a which abolished direct binding of miR-16 to the 3'UTR of VPS4a (p<0.05). VPS4a was increased in the circulation of end-stage HF patients (p<0.001), and led to a decrease in the number of HEK 293T cells in vitro (p<0.001).We provide evidence that miR-16 decreases in the circulation of end-stage HF patients and increases with a LVAD. Modeling studies suggest that miR-16 binds to and decreases expression of VPS4a. Overexpression of VPS4a decreases cell number. Together, these experiments suggest that miR-16 and VPS4a expression are altered in end-stage HF and in response to unloading with a LVAD. This signaling pathway may lead to reduced circulating cell number in HF.

  View details for DOI 10.1371/journal.pone.0101509

  View details for PubMedID 25033200

• How does morphology impact on diastolic function in hypertrophic cardiomyopathy? A single centre experience. BMJ open Finocchiaro, G., Haddad, F., Pavlovic, A., Magavern, E., Sinagra, G., Knowles, J. W., Myers, J., Ashley, E. A. 2014; 4 (6)

  View details for DOI 10.1136/bmjopen-2014-004814

  View details for PubMedID 24928584

• A Balanced Look at the Implications of Genomic (and Other "Omics") Testing for Disease Diagnosis and Clinical Care. Genes Boyd, S. D., Galli, S. J., Schrijver, I., Zehnder, J. L., Ashley, E. A., Merker, J. D. 2014; 5 (3): 748-766

  Abstract

  The tremendous increase in DNA sequencing capacity arising from the commercialization of "next generation" instruments has opened the door to innumerable routes of investigation in basic and translational medical science. It enables very large data sets to be gathered, whose interpretation and conversion into useful knowledge is only beginning. A challenge for modern healthcare systems and academic medical centers is to apply these new methods for the diagnosis of disease and the management of patient care without unnecessary delay, but also with appropriate evaluation of the quality of data and interpretation, as well as the clinical value of the insights gained. Most critically, the standards applied for evaluating these new laboratory data and ensuring that the results and their significance are clearly communicated to patients and their caregivers should be at least as rigorous as those applied to other kinds of medical tests. Here, we present an overview of conceptual and practical issues to be considered in planning for the integration of genomic methods or, in principle, any other type of "omics" testing into clinical care.

  View details for DOI 10.3390/genes5030748

  View details for PubMedID 25257203

• How does morphology impact on diastolic function in hypertrophic cardiomyopathy? A single centre experience. BMJ open Finocchiaro, G., Haddad, F., Pavlovic, A., Magavern, E., Sinagra, G., Knowles, J. W., Myers, J., Ashley, E. A. 2014; 4 (6)

  Abstract

  It is unclear if morphology impacts on diastole in hypertrophic cardiomyopathy (HCM). We sought to determine the relationship between various parameters of diastolic function and morphology in a large HCM cohort.Tertiary referral centre from Stanford, California, USA.383 patients with HCM and normal systolic function between 1999 and 2011. A group of 100 prospectively recruited age-matched and sex-matched healthy participants were used as controls.Echocardiograms were assessed by two blinded board-certified cardiologists. HCM morphology was classified as described in the literature (reverse, sigmoid, symmetric, apical and undefined).Reverse curvature morphology was most commonly observed (218 (57%). Lateral mitral annular E'<12?cm/s was present in 86% of reverse, 88% of sigmoid, 79% of symmetric, 86% of apical and 81% of undefined morphology, p=0.65. E/E' was similarly elevated (E/E': 12.3±7.9 in reverse curvature, 12.1±6.1 in sigmoid, 12.7±9.5 in symmetric, 9.4±4.0 in apical, 12.7±7.9 in undefined morphology, p=0.71) and indexed left atrial volume (LAVi)>40?mL/m(2) was present in 47% in reverse curvature, 33% in sigmoid, 32% in symmetric, 37% in apical and 32% in undefined, p=0.09. Each morphology showed altered parameters of diastolic function when compared with the control population. Left ventricular (LV) obstruction was independently associated with all three diastolic parameters considered, in particular with LAVi>40?mL/m(2) (OR 2.04 (95% CI 1.23 to 3.39), p=0.005), E/E'>15 (OR 4.66 (95% CI 2.51 to 8.64), p<0.001) and E'<8 (OR 2.55 (95% CI 1.42 to 4.53), p=0.001). Other correlates of diastolic dysfunction were age, LV wall thickness and moderate-to-severe mitral regurgitation.In HCM, diastolic dysfunction is present to similar degrees independently from the morphological pattern. The main correlates of diastolic dysfunction are LV obstruction, age, degree of hypertrophy and degree of mitral regurgitation.

  View details for DOI 10.1136/bmjopen-2014-004814

  View details for PubMedID 24928584

  View details for PubMedCentralID PMC4067898

• Rare Variation in Sarcomeric Genes Accompanies MYH7 Hypertrophic Cardiomyopathy Caliri, S. J., Dewey, F. E., Grove, M. E., Priest, J., Shringarpure, S., Pan, C., Datta, S., Puckelwartz, M. J., Golbus, J. R., Snyder, M., Bustamante, C. D., Day, S., McNally, E., Cappola, T., Dorn, G., Ashley, E. A. LIPPINCOTT WILLIAMS & WILKINS. 2013: E161?E162

  View details for Web of Science ID 000330353800024

• Exome Sequencing of Atrioventricular Septal Defects Reveals Rare and de novo Variants in Genes Related to Congenital Heart Disease and Cardiac Development Priest, J. R., Girirajan, S., Dewey, F., Eichler, E. E., Gelb, B. D., Quertermous, T., Ashley, E. A., Portman, M. A. LIPPINCOTT WILLIAMS & WILKINS. 2013: E163

  View details for Web of Science ID 000330353800031

• Genetic Variation Near HCRTR2 Associates With Dramatic Improvement of Heart Function in Patients With Heart Failure Perez, M. V., Pavlovic, A., Wheeler, M. T., Miller, C. L., Thanaporn, P., Dewey, F. E., Pan, S., Absher, D., Cretti, E., Southwick, A., Heidenreich, P., Sedehi, D., Brandimarto, J., Kao, D., Salisbury, H., Chan, K., Rosenthal, D., Bernstein, D., Fowler, M. B., Robbins, R. C., Meyers, R., Meyers, R., Quertermous, T., Cappola, T., Ashley, E. LIPPINCOTT WILLIAMS & WILKINS. 2013

  View details for Web of Science ID 000332162905323

• Effects of respiratory exchange ratio on the prognostic value of peak oxygen consumption and ventilatory efficiency in patients with systolic heart failure. JACC. Heart failure Chase, P. J., Kenjale, A., Cahalin, L. P., Arena, R., Davis, P. G., Myers, J., Guazzi, M., Forman, D. E., Ashley, E., Peberdy, M. A., West, E., Kelly, C. T., Bensimhon, D. R. 2013; 1 (5): 427-432

  Abstract

  The purpose of this analysis was to evaluate the prognostic characteristics of peak oxygen consumption (Vo2) and the minute ventilation/carbon dioxide (VE/Vco2) slope of different peak respiratory exchange ratios (RERs) obtained from cardiopulmonary exercise testing in patients with heart failure (HF).For patients with HF, peak Vo2 and the VE/Vco2 slope are used for assessing prognosis. Peak Vo2 is assessed in association with peak RER ?1.10, indicating maximal effort and prognostic sensitivity. Conversely, the VE/Vco2 slope provides effort-independent prognostic discrimination.Patients with HF scheduled to undergo cardiopulmonary exercise testing were enrolled. Patients were subclassified by peak RER (RER <1.00, RER 1.00 to 1.04, RER 1.05 to 1.09, RER ?1.10) and followed for up to 3 years for major cardiac-related events (death, left ventricular assist device implantation, or cardiac transplantation).Included were 1,728 patients with HF (75% males; 40% ischemic etiology; age: 55 ± 14 years; left ventricular ejection fraction: 28 ± 10%). Two hundred seventy major events occurred, with no proportional differences across the RER subgroups. Multivariate Cox regression analysis indicated that the VE/Vco2 slope and peak Vo2 remained prognostic within each subgroup; the VE/Vco2 slope remained the strongest predictor. Receiver-operating characteristic analysis demonstrated equitable prognostic cutoffs for the VE/Vco2 slope (range: 34.9 to 35.7; area under the curve [AUC] range: 0.69 to 0.75) and peak Vo2 (range: 13.8 to 14.0 ml·kg(-1)·min(-1); AUC range: 0.68 to 0.75).Peak Vo2 provided a sensitive assessment of prognosis in patients with HF in all RER subgroups. The VE/Vco2 slope provided greater prognostic discrimination in all RER subgroups. Clinical consideration may be warranted for patients with low RER, low peak Vo2, and an elevated VE/Vco2 slope.

  View details for DOI 10.1016/j.jchf.2013.05.008

  View details for PubMedID 24621975

• Effects of Respiratory Exchange Ratio on the Prognostic Value of Peak Oxygen Consumption and Ventilatory Efficiency in Patients With Systolic Heart Failure JACC-HEART FAILURE Chase, P. J., Kenjale, A., Cahalin, L. P., Arena, R., Davis, P. G., Myers, J., Guazzi, M., Forman, D. E., Ashley, E., Peberdy, M. A., West, E., Kelly, C. T., Bensimhon, D. R. 2013; 1 (5): 427-432

  Abstract

  The purpose of this analysis was to evaluate the prognostic characteristics of peak oxygen consumption (Vo2) and the minute ventilation/carbon dioxide (VE/Vco2) slope of different peak respiratory exchange ratios (RERs) obtained from cardiopulmonary exercise testing in patients with heart failure (HF).For patients with HF, peak Vo2 and the VE/Vco2 slope are used for assessing prognosis. Peak Vo2 is assessed in association with peak RER ?1.10, indicating maximal effort and prognostic sensitivity. Conversely, the VE/Vco2 slope provides effort-independent prognostic discrimination.Patients with HF scheduled to undergo cardiopulmonary exercise testing were enrolled. Patients were subclassified by peak RER (RER <1.00, RER 1.00 to 1.04, RER 1.05 to 1.09, RER ?1.10) and followed for up to 3 years for major cardiac-related events (death, left ventricular assist device implantation, or cardiac transplantation).Included were 1,728 patients with HF (75% males; 40% ischemic etiology; age: 55 ± 14 years; left ventricular ejection fraction: 28 ± 10%). Two hundred seventy major events occurred, with no proportional differences across the RER subgroups. Multivariate Cox regression analysis indicated that the VE/Vco2 slope and peak Vo2 remained prognostic within each subgroup; the VE/Vco2 slope remained the strongest predictor. Receiver-operating characteristic analysis demonstrated equitable prognostic cutoffs for the VE/Vco2 slope (range: 34.9 to 35.7; area under the curve [AUC] range: 0.69 to 0.75) and peak Vo2 (range: 13.8 to 14.0 ml·kg(-1)·min(-1); AUC range: 0.68 to 0.75).Peak Vo2 provided a sensitive assessment of prognosis in patients with HF in all RER subgroups. The VE/Vco2 slope provided greater prognostic discrimination in all RER subgroups. Clinical consideration may be warranted for patients with low RER, low peak Vo2, and an elevated VE/Vco2 slope.

  View details for DOI 10.1016/j.jchf.2013.05.008

  View details for Web of Science ID 000209535900009

• The prognostic significance of heart rate recovery is not dependent upon maximal effort in patients with heart failure INTERNATIONAL JOURNAL OF CARDIOLOGY Cahalin, L. P., Forman, D. E., Chase, P., Guazzi, M., Myers, J., Bensimhon, D., Peberdy, M. A., Ashley, E., West, E., Arena, R. 2013; 168 (2): 1496-1501

  Abstract

  Heart rate recovery (HRR) has been observed to be a significant prognostic measure in patients with heart failure (HF). However, the prognostic value of HRR has not been examined in regard to the level of patient effort during exercise testing. Using the peak respiratory exchange ratio (RER) and a large multicenter HF database we examined the prognostic utility of HRR.Cardiopulmonary exercise testing (CPX) was performed in 806 HF patients who then underwent an active cool-down of at least 1 min. Peak oxygen consumption (VO2), ventilatory efficiency (VE/VCO2 slope), and peak RER were determined with subjects categorized into subgroups according to peak RER (<1.00, 1.00-1.09, ? 1.10). HRR was defined as the difference between heart rate at peak exercise and 1 min following test termination. Patients were followed for major cardiac events for up to four years post-CPX.There were 163 major cardiac events (115 deaths, 20 left ventricular assist device implantations, and 28 transplantations) during the four year tracking period. Univariate Cox regression analysis results identified HRR as a significant (p<0.05) univariate predictor of adverse events regardless of the RER achieved. Multivariate Cox regression analysis in the overall group revealed that the VE/VCO2 slope was the strongest predictor of adverse events (chi-square: 110.9, p<0.001) with both HRR (residual chi-square: 16.7, p<0.001) and peak VO2 (residual chi-square: 10.4, p<0.01) adding significant prognostic value.HRR after symptom-limited exercise testing performed at sub-maximal efforts using RER to categorize level of effort is as predictive as HRR after maximal effort in HF patients.

  View details for DOI 10.1016/j.ijcard.2012.12.102

  View details for Web of Science ID 000325412800152

  View details for PubMedID 23391698

• Exercise capacity in patients with hypertrophic cardiomyopathy: non-invasive hemodynamic responses to exercise and association with clinical and imaging variables Finocchiaro, G., Haddad, F., Pavlovic, A., Sinagra, G., Wong, M., Knowles, J. K., Perez, M., Myers, J., Ashley, E. OXFORD UNIV PRESS. 2013: 532?33

  View details for Web of Science ID 000327744603194

• Prognostic role of exercise echocardiography in patients with hypertrophic cardiomyopathy Finocchiaro, G., Haddad, F., Pavlovic, A., Sinagra, G., Magavern, E., Knowles, J. K., Ashley, E. OXFORD UNIV PRESS. 2013: 167

  View details for Web of Science ID 000327744601055

• Race differences in ventricular remodeling and function among college football players. American journal of cardiology Haddad, F., Peter, S., Hulme, O., Liang, D., Schnittger, I., Puryear, J., Gomari, F. A., Finocchiaro, G., Myers, J., Froelicher, V., Garza, D., Ashley, E. A. 2013; 112 (1): 128-134

  Abstract

  Athletic training is associated with increases in ventricular mass and volume. Recent studies have shown that left ventricular mass increases proportionally in white athletes with a mass/volume ratio approaching unity. The objective of this study was to compare the proportionality in ventricular remodeling and ventricular function in black versus white National Collegiate Athletic Association Division I football players. From 2008 to 2011, football players at Stanford University underwent cardiovascular screening with a 12-point history and physical examination, electrocardiography, and focused echocardiography. Compared with white players, black players had on average higher left ventricular mass indexes (77 ± 11 vs 71 ± 11 g/m(2), p = 0.009), higher mass/volume ratios (1.18 ± 0.16 vs 1.06 ± 0.09 g/ml, p <0.001), and higher QRS vector magnitudes (3.2 ± 0.7 vs 2.7 ± 0.8, p = 0.002). Black race had an odds ratio of 14 (95% confidence interval 5 to 42, p <0.001) for a mass/volume ratio >1.2. Mass/volume ratio was inversely related to early diastolic tissue Doppler velocity e' (r = -0.50, p <0.001) but not to QRS vector magnitude (r = 0.065, p = 0.034). With regard to systolic indexes, there was no significant difference in the left ventricular ejection fraction, velocity of circumferential shortening, and isovolumic acceleration. In conclusion, black college football players exhibit more concentric ventricular remodeling, lower early diastolic annular velocities, and increased ventricular voltage compared with white players. Ventricular mass increases proportionally to volume in white players but not in black players.

  View details for DOI 10.1016/j.amjcard.2013.02.065

  View details for PubMedID 23602691

• Taming Rare Variation With Known Biology in Long QT Syndrome. Circulation. Cardiovascular genetics Perez, M. V., Ashley, E. A. 2013; 6 (3): 227-229

  View details for DOI 10.1161/CIRCGENETICS.113.000199

  View details for PubMedID 23778589

• Prevention of Sudden Cardiac Death With Implantable Cardioverter-Defibrillators in Children and Adolescents With Hypertrophic Cardiomyopathy JOURNAL OF THE AMERICAN COLLEGE OF CARDIOLOGY Maron, B. J., Spirito, P., Ackerman, M. J., Casey, S. A., Semsarian, C., Estes, N. A., Shannon, K. M., Ashley, E. A., Day, S. M., Pacileo, G., Formisano, F., Devoto, E., Anastasakis, A., Bos, J. M., Woo, A., Autore, C., Pass, R. H., Boriani, G., Garberich, R. F., Almquist, A. K., Russell, M. W., Boni, L., Berger, S., Maron, M. S., Link, M. S. 2013; 61 (14): 1527-1535

  Abstract

  The aim of this study was to determine the efficacy of implantable cardioverter-defibrillators (ICDs) in children and adolescents with hypertrophic cardiomyopathy (HCM).HCM is the most common cause of sudden death in the young. The availability of ICDs over the past decade for HCM has demonstrated the potential for sudden death prevention, predominantly in adult patients.A multicenter international registry of ICDs implanted (1987 to 2011) in 224 unrelated children and adolescents with HCM judged at high risk for sudden death was assembled. Patients received ICDs for primary (n = 188) or secondary (n = 36) prevention after undergoing evaluation at 22 referral and nonreferral institutions in the United States, Canada, Europe, and Australia.Defibrillators were activated appropriately to terminate ventricular tachycardia or ventricular fibrillation in 43 of 224 patients (19%) over a mean of 4.3 ± 3.3 years. ICD intervention rates were 4.5% per year overall, 14.0% per year for secondary prevention after cardiac arrest, and 3.1% per year for primary prevention on the basis of risk factors (5-year cumulative probability 17%). The mean time from implantation to first appropriate discharge was 2.9 ± 2.7 years (range to 8.6 years). The primary prevention discharge rate terminating ventricular tachycardia or ventricular fibrillation was the same in patients who underwent implantation for 1, 2, or ?3 risk factors (12 of 88 [14%], 10 of 71 [14%], and 4 of 29 [14%], respectively, p = 1.00). Extreme left ventricular hypertrophy was the most common risk factor present (alone or in combination with other markers) in patients experiencing primary prevention interventions (17 of 26 [65%]). ICD-related complications, particularly inappropriate shocks and lead malfunction, occurred in 91 patients (41%) at 17 ± 5 years of age.In a high-risk pediatric HCM cohort, ICD interventions terminating life-threatening ventricular tachyarrhythmias were frequent. Extreme left ventricular hypertrophy was most frequently associated with appropriate interventions. The rate of device complications adds a measure of complexity to ICD decisions in this age group.

  View details for DOI 10.1016/j.jacc.2013.01.037

  View details for Web of Science ID 000317192300010

  View details for PubMedID 23500286

• Physical Activity and Other Health Behaviors in Adults With Hypertrophic Cardiomyopathy AMERICAN JOURNAL OF CARDIOLOGY Reineck, E., Rolston, B., Bragg-Gresham, J. L., Salberg, L., Baty, L., Kumar, S., Wheeler, M. T., Ashley, E., Saberi, S., Day, S. M. 2013; 111 (7): 1034-1039

  Abstract

  The clinical expression of hypertrophic cardiomyopathy (HC) is undoubtedly influenced by modifying genetic and environmental factors. Lifestyle practices such as tobacco and alcohol use, poor nutritional intake, and physical inactivity are strongly associated with adverse cardiovascular outcomes and increased mortality in the general population. Before addressing the direct effect of such modifiable factors on the natural history of HC, it is critical to define their prevalence in this population. A voluntary survey, drawing questions in part from the 2007 to 2008 National Health and Nutrition Examination Survey (NHANES), was posted on the HC Association website and administered to patients with HC at the University of Michigan. Propensity score matching to NHANES participants was used. Dichotomous and continuous health behaviors were analyzed using logistic and linear regression, respectively, and adjusted for body mass index and propensity score quintile. Compared to the matched NHANES participants, the patients with HC reported significantly less alcohol and tobacco use but also less time engaged in physical activity at work and for leisure. Time spent participating in vigorous or moderate activity was a strong predictor of self-reported exercise capacity. The body mass index was greater in the HC cohort than in the NHANES cohort. Exercise restrictions negatively affected emotional well-being in most surveyed subjects. In conclusion, patients with HC are less active than the general United States population. The well-established relation of inactivity, obesity, and cardiovascular mortality might be exaggerated in patients with HC. More data are needed on exercise in those with HC to strike a balance between acute risks and the long-term health benefits of exercise.

  View details for DOI 10.1016/j.amjcard.2012.12.018

  View details for Web of Science ID 000316923700018

  View details for PubMedID 23340032

• Prevalence and Clinical Correlates of Right Ventricular Dysfunction in Patients with Hypertrophic Cardiomyopathy Finocchiaro, G., Pavlovic, A., Sudini, N. L., Sinagra, G., Haddad, F., Ashley, E. ELSEVIER SCIENCE INC. 2013: S21?S22

  View details for DOI 10.1016/j.healun.2013.01.036

  View details for Web of Science ID 000316712100036

• WHAT IS THE PROGNOSTIC VALUE OF THE ST DEPRESSION CRITERIA FOR ISCHEMIA RECOMMENDED IN THE UNIVERSAL DEFINITION FOR MYOCARDIAL INFARCTION? 62nd Annual Scientific Session of the American-College-of-Cardiology Perino, A., Singh, N., Aggarwal, S., Perez, M., Ashley, E., Froelicher, V. ELSEVIER SCIENCE INC. 2013: E1166?E1166

  View details for Web of Science ID 000316555201271

• PREVALENCE AND CLINICAL CORRELATES OF RIGHT VENTRICULAR DYSFUNCTION IN PATIENTS WITH HYPERTROPHIC CARDIOMYOPATHY Finocchiaro, G., Pavlovic, A., Shmargad, Y., Sinagra, G., Haddad, F., Ashley, E. ELSEVIER SCIENCE INC. 2013: E1273

  View details for DOI 10.1016/S0735-1097(13)61273-5

  View details for Web of Science ID 000316555201378

• A NEURAL NETWORK APPROACH TO PREDICTING OUTCOMES IN HEART FAILURE USING CARDIOPULMONARY EXERCISE TESTING Arena, R., Myers, J. N., de Souza, C., Silva, A., Guazzi, M., Chase, P., Bensimhon, D., Peberdy, M., Ashley, E., West, E., Cahalin, L., Forman, D. ELSEVIER SCIENCE INC. 2013: E1415

  View details for DOI 10.1016/S0735-1097(13)61415-1

  View details for Web of Science ID 000316555201520

• PAROXYSMAL ATRIAL FIBRILLATION IS ASSOCIATED WITH EXERCISE INTOLERANCE AMONG INDIVIDUALS WITH HYPERTROPHIC CARDIOMYOPATHY 62nd Annual Scientific Session of the American-College-of-Cardiology Azarbal, F., Singh, M., Finocchiaro, G., Le, V., Schnittger, I., Wang, P., Myers, J., Perez, M., Ashley, E. ELSEVIER SCIENCE INC. 2013: E1617?E1617

  View details for Web of Science ID 000316555201722

• PATTERNS AND PROGNOSIS OF ALL COMPONENTS OF EARLY REPOLARIZATION IN ATHLETES AND AMBULATORY PATIENTS 62nd Annual Scientific Session of the American-College-of-Cardiology Muramoto, D., Singh, N., Aggarwal, S., Perez, M., Ashley, E., Hadley, D., Froelicher, V. ELSEVIER SCIENCE INC. 2013: E349?E349

  View details for Web of Science ID 000316555200349

• Validation of a cardiopulmonary exercise test score in heart failure. Circulation. Heart failure Myers, J., Oliveira, R., Dewey, F., Arena, R., Guazzi, M., Chase, P., Bensimhon, D., Peberdy, M. A., Ashley, E., West, E., Cahalin, L. P., Forman, D. E. 2013; 6 (2): 211-218

  Abstract

  Cardiopulmonary exercise test (CPX) responses are strong predictors of outcomes in patients with heart failure. We recently developed a CPX score that integrated the additive prognostic information from CPX. The purpose of this study was to validate the score in a larger, independent sample of patients.A total of 2625 patients with heart failure underwent CPX and were followed for cardiovascular (CV) mortality and major CV events (death, transplantation, left ventricular assist device implantation). Net reclassification improvement (NRI) for the score and each of its components were determined at 3 years. The VE/VCO2 slope was the strongest predictor of risk and was attributed a relative weight of 7, with weighted scores for abnormal heart rate recovery, oxygen uptake efficiency slope, end-tidal CO2 pressure, and peak VO2 having scores of 5, 3, 3, and 2, respectively. A summed score of >15 was associated with an annual mortality rate of 12.2% and a relative risk >9 for total events, whereas a score of <5 was associated with an annual mortality rate of 1.2%. The composite score was the most accurate predictor of CV events among all CPX responses considered (C indexes, 0.70 for CV mortality and 0.72 for the composite outcome). Each component of the score provided significant NRI compared with peak VO2 (category-free NRI, 0.61-0.77), and the score provided significant NRI above clinical risk factors for both CV events and mortality (NRI, 0.63 and 0.65 for CPX score compared with clinical variables alone).These results validate the application of a simple, integrated multivariable score based on readily available CPX responses.

  View details for DOI 10.1161/CIRCHEARTFAILURE.112.000073

  View details for PubMedID 23392791

• Impact of Cardiorespiratory Fitness on the Obesity Paradox in Patients With Heart Failure MAYO CLINIC PROCEEDINGS Lavie, C. J., Cahalin, L. P., Chase, P., Myers, J., Bensimhon, D., Peberdy, M. A., Ashley, E., West, E., Forman, D. E., Guazzi, M., Arena, R. 2013; 88 (3): 251-258

  Abstract

  To determine the impact of cardiorespiratory fitness (FIT) on survival in relation to the obesity paradox in patients with systolic heart failure (HF).We studied 2066 patients with systolic HF (body mass index [BMI] ?18.5 kg/m(2)) between April 1, 1993 and May 11, 2011 (with 1784 [86%] tested after January 31, 2000) from a multicenter cardiopulmonary exercise testing database who were followed for up to 5 years (mean ± SD, 25.0±17.5 months) to determine the impact of FIT (peak oxygen consumption <14 vs ?14 mL O2 ? kg(-1) ? min(-1)) on the obesity paradox.There were 212 deaths during follow-up (annual mortality, 4.5%). In patients with low FIT, annual mortality was 8.2% compared with 2.8% in those with high FIT (P<.001). After adjusting for age and sex, BMI was a significant predictor of survival in the low FIT subgroup when expressed as a continuous (P=.03) and dichotomous (<25.0 vs ?25.0 kg/m(2)) (P=.01) variable. Continuous and dichotomous BMI expressions were not significant predictors of survival in the overall and high FIT groups after adjusting for age and sex. In patients with low FIT, progressively worse survival was noted with BMI of 30.0 or greater, 25.0 to 29.9, and 18.5 to 24.9 (log-rank, 11.7; P=.003), whereas there was no obesity paradox noted in those with high FIT (log-rank, 1.72; P=.42).These results indicate that FIT modifies the relationship between BMI and survival. Thus, assessing the obesity paradox in systolic HF may be misleading unless FIT is considered.

  View details for DOI 10.1016/j.mayocp.2012.11.020

  View details for Web of Science ID 000317331800009

  View details for PubMedID 23489451

• Cardiopulmonary and Noninvasive Hemodynamic Responses to Exercise Predict Outcomes in Heart Failure JOURNAL OF CARDIAC FAILURE Myers, J., Wong, M., Adhikarla, C., Boga, M., Challa, S., Abella, J., Ashley, E. A. 2013; 19 (2): 101-107

  Abstract

  An impaired cardiac output response to exercise is a hallmark of chronic heart failure (HF). We determined the extent to which noninvasive estimates of cardiac hemodynamics during exercise in combination with cardiopulmonary exercise test (CPX) responses improved the estimation of risk for adverse events in patients with HF.CPX and impedance cardiography were performed in 639 consecutive patients (mean age 48 ± 14 years), evaluated for HF. Clinical, hemodynamic, and CPX variables were acquired at baseline and subjects were followed for a mean of 460 ± 332 days. Patients were followed for the composite outcome of cardiac-related death, hospitalization for worsening HF, cardiac transplantation, and left ventricular assist device implantation. Cox proportional hazards analyses including clinical, noninvasive hemodynamic, and CPX variables were performed to determine their association with the composite endpoint. There were 113 events. Among CPX variables, peak oxygen uptake (VO(2)) and the minute ventilation (VE)/carbon dioxide production (VCO(2)) slope were significant predictors of risk for adverse events (age-adjusted hazard ratio [HR] 1.08, 95% confidence interval [CI] 1.05-1.11 for both; P < .001). Among hemodynamic variables, peak cardiac index was the strongest predictor of risk (HR 1.08, 95% CI 1.0-1.16; P = .01). In a multivariate analysis including CPX and noninvasively determined hemodynamic variables, the most powerful predictive model included the combination of peak VO(2), peak cardiac index, and the VE/VCO(2) slope, with each contributing significantly and independently to predicting risk; an abnormal response for all 3 yielded an HR of 5.1 (P < .001).These findings suggest that noninvasive indices of cardiac hemodynamics complement established CPX measures in quantifying risk in patients with HF.

  View details for DOI 10.1016/j.cardfail.2012.11.010

  View details for Web of Science ID 000315017600006

  View details for PubMedID 23384635

• Electrocardiographic interpretation in athletes: the 'Seattle Criteria' BRITISH JOURNAL OF SPORTS MEDICINE Drezner, J. A., Ackerman, M. J., Anderson, J., Ashley, E., Asplund, C. A., Baggish, A. L., Borjesson, M., Cannon, B. C., Corrado, D., Difiori, J. P., Fischbach, P., Froelicher, V., Harmon, K. G., Heidbuchel, H., Marek, J., Owens, D. S., Paul, S., Pelliccia, A., Prutkin, J. M., Salerno, J. C., Schmied, C. M., Sharma, S., Stein, R., Vetter, V. L., Wilson, M. G. 2013; 47 (3): 122-124

  Abstract

  Sudden cardiac death (SCD) is the leading cause of death in athletes during sport. Whether obtained for screening or diagnostic purposes, an ECG increases the ability to detect underlying cardiovascular conditions that may increase the risk for SCD. In most countries, there is a shortage of physician expertise in the interpretation of an athlete's ECG. A critical need exists for physician education in modern ECG interpretation that distinguishes normal physiological adaptations in athletes from abnormal findings suggestive of pathology. On 13-14 February 2012, an international group of experts in sports cardiology and sports medicine convened in Seattle, Washington, to define contemporary standards for ECG interpretation in athletes. The objective of the meeting was to develop a comprehensive training resource to help physicians distinguish normal ECG alterations in athletes from abnormal ECG findings that require additional evaluation for conditions associated with SCD.

  View details for DOI 10.1136/bjsports-2012-092067

  View details for Web of Science ID 000314349700002

  View details for PubMedID 23303758

• Abnormal electrocardiographic findings in athletes: recognising changes suggestive of primary electrical disease BRITISH JOURNAL OF SPORTS MEDICINE Drezner, J. A., Ackerman, M. J., Cannon, B. C., Corrado, D., Heidbuchel, H., Prutkin, J. M., Salerno, J. C., Anderson, J., Ashley, E., Asplund, C. A., Baggish, A. L., Borjesson, M., Difiori, J. P., Fischbach, P., Froelicher, V., Harmon, K. G., Marek, J., Owens, D. S., Paul, S., Pelliccia, A., Schmied, C. M., Sharma, S., Stein, R., Vetter, V. L., Wilson, M. G. 2013; 47 (3): 153-?

  Abstract

  Cardiac channelopathies are potentially lethal inherited arrhythmia syndromes and an important cause of sudden cardiac death (SCD) in young athletes. Other cardiac rhythm and conduction disturbances also may indicate the presence of an underlying cardiac disorder. The 12-lead ECG is utilised as both a screening and a diagnostic tool for detecting conditions associated with SCD. Fundamental to the appropriate evaluation of athletes undergoing ECG is an understanding of the ECG findings that may indicate the presence of a pathological cardiac disease. This article describes ECG findings present in primary electrical diseases afflicting young athletes and outlines appropriate steps for further evaluation of these ECG abnormalities. The ECG findings defined as abnormal in athletes were established by an international consensus panel of experts in sports cardiology and sports medicine.

  View details for DOI 10.1136/bjsports-2012-092070

  View details for Web of Science ID 000314349700005

  View details for PubMedID 23303761

• Abnormal electrocardiographic findings in athletes: recognising changes suggestive of cardiomyopathy BRITISH JOURNAL OF SPORTS MEDICINE Drezner, J. A., Ashley, E., Baggish, A. L., Borjesson, M., Corrado, D., Owens, D. S., Patel, A., Pelliccia, A., Vetter, V. L., Ackerman, M. J., Anderson, J., Asplund, C. A., Cannon, B. C., DiFiori, J., Fischbach, P., Froelicher, V., Harmon, K. G., Heidbuchel, H., Marek, J., Paul, S., Prutkin, J. M., Salerno, J. C., Schmied, C. M., Sharma, S., Stein, R., Wilson, M. 2013; 47 (3): 137-?

  Abstract

  Cardiomyopathies are a heterogeneous group of heart muscle diseases and collectively are the leading cause of sudden cardiac death (SCD) in young athletes. The 12-lead ECG is utilised as both a screening and diagnostic tool for detecting conditions associated with SCD. Fundamental to the appropriate evaluation of athletes undergoing ECG is an understanding of the ECG findings that may indicate the presence of an underlying pathological cardiac disorder. This article describes ECG findings present in cardiomyopathies afflicting young athletes and outlines appropriate steps for further evaluation of these ECG abnormalities. The ECG findings defined as abnormal in athletes were established by an international consensus panel of experts in sports cardiology and sports medicine.

  View details for DOI 10.1136/bjsports-2012-092069

  View details for Web of Science ID 000314349700004

  View details for PubMedID 23303760

• Normal electrocardiographic findings: recognising physiological adaptations in athletes BRITISH JOURNAL OF SPORTS MEDICINE Drezner, J. A., Fischbach, P., Froelicher, V., Marek, J., Pelliccia, A., Prutkin, J. M., Schmied, C. M., Sharma, S., Wilson, M. G., Ackerman, M. J., Anderson, J., Ashley, E., Asplund, C. A., Baggish, A. L., Borjesson, M., Cannon, B. C., Corrado, D., Difiori, J. P., Harmon, K. G., Heidbuchel, H., Owens, D. S., Paul, S., Salerno, J. C., Stein, R., Vetter, V. L. 2013; 47 (3): 125-?

  Abstract

  Electrocardiographic changes in athletes are common and usually reflect benign structural and electrical remodelling of the heart as a physiological adaptation to regular and sustained physical training (athlete's heart). The ability to identify an abnormality on the 12-lead ECG, suggestive of underlying cardiac disease associated with sudden cardiac death (SCD), is based on a sound working knowledge of the normal ECG characteristics within the athletic population. This document will assist physicians in identifying normal ECG patterns commonly found in athletes. The ECG findings presented as normal in athletes were established by an international consensus panel of experts in sports cardiology and sports medicine.

  View details for DOI 10.1136/bjsports-2012-092068

  View details for Web of Science ID 000314349700003

  View details for PubMedID 23303759

• A Clinical Approach to Inherited Hypertrophy The Use of Family History in Diagnosis, Risk Assessment, and Management CIRCULATION-CARDIOVASCULAR GENETICS Dunn, K. E., Caleshu, C., Cirino, A. L., Ho, C. Y., Ashley, E. A. 2013; 6 (1): 118-131

  View details for DOI 10.1161/CIRCGENETICS.110.959387

  View details for Web of Science ID 000315301500017

  View details for PubMedID 23424256

• Abnormal Calcium Handling Properties Underlie Familial Hypertrophic Cardiomyopathy Pathology in Patient-Specific Induced Pluripotent Stem Cells CELL STEM CELL Lan, F., Lee, A. S., Liang, P., Sanchez-Freire, V., Nguyen, P. K., Wang, L., Han, L., Yen, M., Wang, Y., Sun, N., Abilez, O. J., Hu, S., Ebert, A. D., Navarrete, E. G., Simmons, C. S., Wheeler, M., Pruitt, B., Lewis, R., Yamaguchi, Y., Ashley, E. A., Bers, D. M., Robbins, R. C., Longaker, M. T., Wu, J. C. 2013; 12 (1): 101-113

  Abstract

  Familial hypertrophic cardiomyopathy (HCM) is a prevalent hereditary cardiac disorder linked to arrhythmia and sudden cardiac death. While the causes of HCM have been identified as genetic mutations in the cardiac sarcomere, the pathways by which sarcomeric mutations engender myocyte hypertrophy and electrophysiological abnormalities are not understood. To elucidate the mechanisms underlying HCM development, we generated patient-specific induced pluripotent stem cell cardiomyocytes (iPSC-CMs) from a ten-member family cohort carrying a hereditary HCM missense mutation (Arg663His) in the MYH7 gene. Diseased iPSC-CMs recapitulated numerous aspects of the HCM phenotype including cellular enlargement and contractile arrhythmia at the single-cell level. Calcium (Ca(2+)) imaging indicated dysregulation of Ca(2+) cycling and elevation in intracellular Ca(2+) ([Ca(2+)](i)) are central mechanisms for disease pathogenesis. Pharmacological restoration of Ca(2+) homeostasis prevented development of hypertrophy and electrophysiological irregularities. We anticipate that these findings will help elucidate the mechanisms underlying HCM development and identify novel therapies for the disease.

  View details for DOI 10.1016/j.stem.2012.10.010

  View details for Web of Science ID 000313839500014

  View details for PubMedID 23290139

  View details for PubMedCentralID PMC3638033

• A meta-analysis of the prognostic significance of cardiopulmonary exercise testing in patients with heart failure HEART FAILURE REVIEWS Cahalin, L. P., Chase, P., Arena, R., Myers, J., Bensimhon, D., Peberdy, M. A., Ashley, E., West, E., Forman, D. E., Pinkstaff, S., Lavie, C. J., Guazzi, M. 2013; 18 (1): 79-94

  Abstract

  The objective of the study is to assess the role of cardiopulmonary exercise testing (CPX) variables, including peak oxygen consumption (VO(2)), which is the most recognized CPX variable, the minute ventilation/carbon dioxide production (VE/VCO(2)) slope, the oxygen uptake efficiency slope (OUES), and exercise oscillatory ventilation (EOV) in a current meta-analysis investigating the prognostic value of a broader list of CPX-derived variables for major adverse cardiovascular events in patients with HF. A search for relevant CPX articles was performed using standard meta-analysis methods. Of the initial 890 articles found, 30 met our inclusion criteria and were included in the final analysis. The total subject populations included were as follows: peak VO(2) (7,319), VE/VCO(2) slope (5,044), EOV (1,617), and OUES (584). Peak VO(2), the VE/VCO(2) slope and EOV were all highly significant prognostic markers (diagnostic odds ratios ? 4.10). The OUES also demonstrated promise as a prognostic marker (diagnostic odds ratio = 8.08) but only in a limited number of studies (n = 2). No other independent variables (including age, ejection fraction, and beta-blockade) had a significant effect on the meta-analysis results for peak VO(2) and the VE/VCO(2) slope. CPX is an important component in the prognostic assessment of patients with HF. The results of this meta-analysis strongly confirm this and support a multivariate approach to the application of CPX in this patient population.

  View details for DOI 10.1007/s10741-012-9332-0

  View details for Web of Science ID 000312882800007

  View details for PubMedID 22733204

• Whole Exome Sequencing Identifies Novel Candidate Genes In A Cohort Of Patients With Idiopathic Pulmonary Arterial Hypertension Perez, V., Lyuksyutova, M., Dewey, F., Del Rosario, P., Ashley, E., Zamanian, R. T. AMER THORACIC SOC. 2013

  View details for Web of Science ID 000209839101715

• Whole Exome Sequencing Identifies Carboxylesterase 1 As Aa Novel Candidate Gene In Patients With Methamphetamine Induced Pulmonary Hypertension Zamanian, R. T., Khurshudyan, A., Dewey, F., Orcholski, M., Ashley, E., Perez, V. AMER THORACIC SOC. 2013

  View details for Web of Science ID 000209839100719

• ACTIVATION OF VEGFR-2 IN ADVENTITIAL STEM CELLS TRIGGERS VASCULAR REMODELLING Chang, C., Lin, C., Lin, C., Lehrer, J., Krampitz, G., Ikeno, F., Ali, Z., Wang, R., Ashley, E., Rabinovitch, M. KARGER. 2013: 15

  View details for Web of Science ID 000326437200014

• Cardiac Structural and Sarcomere Genes Associated With Cardiomyopathy Exhibit Marked Intolerance of Genetic Variation CIRCULATION-CARDIOVASCULAR GENETICS Pan, S., Caleshu, C. A., Dunn, K. E., Foti, M. J., Moran, M. K., Soyinka, O., Ashley, E. A. 2012; 5 (6): 602-610

  Abstract

  The clinical significance of variants in genes associated with inherited cardiomyopathies can be difficult to determine because of uncertainty regarding population genetic variation and a surprising amount of tolerance of the genome even to loss-of-function variants. We hypothesized that genes associated with cardiomyopathy might be particularly resistant to the accumulation of genetic variation.We analyzed the rates of single nucleotide genetic variation in all known genes from the exomes of >5000 individuals from the National Heart, Lung, and Blood Institute's Exome Sequencing Project, as well as the rates of structural variation from the Database of Genomic Variants. Most variants were rare, with over half unique to 1 individual. Cardiomyopathy-associated genes exhibited a rate of nonsense variants, about 96.1% lower than other Mendelian disease genes. We tested the ability of in silico algorithms to distinguish between a set of variants in MYBPC3, MYH7, and TNNT2 with strong evidence for pathogenicity and variants from the Exome Sequencing Project data. Algorithms based on conservation at the nucleotide level (genomic evolutionary rate profiling, PhastCons) did not perform as well as amino acid-level prediction algorithms (Polyphen-2, SIFT). Variants with strong evidence for disease causality were found in the Exome Sequencing Project data at prevalence higher than expected.Genes associated with cardiomyopathy carry very low rates of population variation. The existence in population data of variants with strong evidence for pathogenicity suggests that even for Mendelian disease genetics, a probabilistic weighting of multiple variants may be preferred over the single gene causality model.

  View details for DOI 10.1161/CIRCGENETICS.112.963421

  View details for Web of Science ID 000312774800008

  View details for PubMedID 23074333

  View details for PubMedCentralID PMC3526690

• Patients with Hypertrophic Cardiomyopathy are Less Physically Active than the General Population Rolston, B., Reineck, E., Bragg-Gresham, J., Salberg, L., Saberi, S., Baty, L., Wheeler, M., Ashley, E., Day, S. M. LIPPINCOTT WILLIAMS & WILKINS. 2012

  View details for Web of Science ID 000208885004387

• Race Differences in Ventricular Remodeling Among College Football Players: Implications for a Cardiovascular Screening Program Peter, S., Haddad, F., Hulme, O., Gomari, A., Myers, J., Froelicher, V., Ashley, E. LIPPINCOTT WILLIAMS & WILKINS. 2012

  View details for Web of Science ID 000208885000066

• Are T wave Inversions in the Anterior Precordial Leads Benign in African-Americans? Findley, C. M., Stein, R., Perez, M., Ashley, E., Froelicher, V. LIPPINCOTT WILLIAMS & WILKINS. 2012

  View details for Web of Science ID 000208885005074

• Impact of Cardiorespiratory Fitness on the Obesity Paradox in Patients with Heart Failure Lavie, C. J., Cahalin, L. P., Chase, P., Myers, J., Bensimhon, D., Peberdy, M., Ashley, E., West, E., Forman, D. E., Guazzil, M., Arena, R. LIPPINCOTT WILLIAMS & WILKINS. 2012

  View details for Web of Science ID 000208885004261

• Analysis of Cardiomyopathy Using Whole Genome Sequencing Golbus, J. R., Puckelwartz, M. J., Pesce, L. L., Wolfgeher, D., Dellefave-Castillo, L., Cappola, T. P., Ashley, E. A., Dorn, G. W., McNally, E. M. LIPPINCOTT WILLIAMS & WILKINS. 2012

  View details for Web of Science ID 000208885006269

• Prognostic value of capnography during rest and exercise in patients with heart failure. Congestive heart failure (Greenwich, Conn.) Arena, R., Guazzi, M., Myers, J., Chase, P., Bensimhon, D., Cahalin, L. P., Peberdy, M. A., Ashley, E., West, E., Forman, D. E. 2012; 18 (6): 302-307

  Abstract

  New variables obtained from cardiopulmonary exercise testing (CPX) have received attention in recent years, in particular the partial pressure of end-tidal carbon dioxide (P(ET) CO(2) ). The purpose of this study was to therefore comprehensively assess the ability of resting and exercise P(ET) CO(2) to predict major cardiac events in a heart failure (HF) cohort referred for CPX. A total of 963 patients with systolic HF undergoing symptom-limited CPX were included in the analysis. Resting and exercise P(ET) CO(2) along with other CPX variables were determined, and patients were followed for major adverse events. With regard to resting measures, multivariate analysis revealed that left ventricular ejection fraction was the most robust prognostic marker (P<.001) while resting P(ET) CO(2) added significant predictive value and was retained in the regression (P<.001). When exercise data were considered, the multivariate analysis revealed that the P(ET) CO(2) apex during exercise added predictive value and was retained (P<.05). In what is the largest evaluation of P(ET) CO(2) in the assessment of systolic HF patients to date, the authors substantiate prior (smaller) studies showing prognostic utility of P(ET) CO(2) , both as a resting measure (an important potential screening tool) and during exercise. These data add to the rationale to incorporate P(ET) CO(2) as a routine monitoring component in HF management.

  View details for DOI 10.1111/j.1751-7133.2012.00296.x

  View details for PubMedID 22537025

• Ventilatory Power A Novel Index That Enhances Prognostic Assessment of Patients With Heart Failure CIRCULATION-HEART FAILURE Forman, D. E., Guazzi, M., Myers, J., Chase, P., Bensimhon, D., Cahalin, L. P., Peberdy, M. A., Ashley, E., West, E., Daniels, K. M., Arena, R. 2012; 5 (5): 621-626

  Abstract

  Minute ventilation/CO(2) production (VE/Vco(2)) slope is an index determined by cardiopulmonary exercise testing, which incorporates pertinent cardiac, pulmonary, and skeletal muscle physiology into a substantive composite assessment. The VE/Vco(2) slope has many applications, including utility as a well-validated prognostic gauge for patients with heart failure (HF). In this study, we combine VE/Vco(2) slope with systolic blood pressure, creating a novel index that we labeled ventilatory power. Ventilatory power links the combined physiology inherent in the VE/Vco(2) slope to peripheral pressure, adding an additional dimension pertinent to HF assessment. Whereas the related concept of circulatory power links peak oxygen consumption with peak systolic blood pressure as a prognostic index, we hypothesized that ventilatory power would provide greater prognostic discrimination than VE/Vco2 slope, peak oxygen consumption, and circulatory power for patients with systolic HF.Patients with systolic HF (left ventricular ejection fraction ?35%) underwent symptom-limited cardiopulmonary exercise testing as part of routine management and were followed for up to 4 years for major cardiac events (mortality, left ventricular assist device implantation, and heart transplantation). Eight hundred seventy-five patients with HF (left ventricular ejection fraction, 26±9%; mean age, 55±14) were studied. Cardiopulmonary exercise testing indices peak oxygen consumption, VE/Vco(2) slope, circulatory power, and ventilatory power were all predictive of cardiac events (P<0.001). Multivariate analysis demonstrated that ventilatory power was the strongest indicator of prognosis.Although circulatory power and traditional cardiopulmonary exercise testing parameters can be used to predict prognosis among patients with HF, ventilatory power provides relatively greater prognostic discrimination and may constitute a relatively more useful composite tool.

  View details for DOI 10.1161/CIRCHEARTFAILURE.112.968529

  View details for Web of Science ID 000313579500014

  View details for PubMedID 22899767

• APJ acts as a dual receptor in cardiac hypertrophy NATURE Scimia, M. C., Hurtado, C., Ray, S., Metzler, S., Wei, K., Wang, J., Woods, C. E., Purcell, N. H., Catalucci, D., Akasaka, T., Bueno, O. F., Vlasuk, G. P., Kaliman, P., Bodmer, R., Smith, L. H., Ashley, E., Mercola, M., Brown, J. H., Ruiz-Lozano, P. 2012; 488 (7411): 394-398

  Abstract

  Cardiac hypertrophy is initiated as an adaptive response to sustained overload but progresses pathologically as heart failure ensues. Here we report that genetic loss of APJ, a G-protein-coupled receptor, confers resistance to chronic pressure overload by markedly reducing myocardial hypertrophy and heart failure. In contrast, mice lacking apelin (the endogenous APJ ligand) remain sensitive, suggesting an apelin-independent function of APJ. Freshly isolated APJ-null cardiomyocytes exhibit an attenuated response to stretch, indicating that APJ is a mechanosensor. Activation of APJ by stretch increases cardiomyocyte cell size and induces molecular markers of hypertrophy. Whereas apelin stimulates APJ to activate G?i and elicits a protective response, stretch signals in an APJ-dependent, G-protein-independent fashion to induce hypertrophy. Stretch-mediated hypertrophy is prevented by knockdown of ?-arrestins or by pharmacological doses of apelin acting through G?i. Taken together, our data indicate that APJ is a bifunctional receptor for both mechanical stretch and the endogenous peptide apelin. By sensing the balance between these stimuli, APJ occupies a pivotal point linking sustained overload to cardiomyocyte hypertrophy.

  View details for DOI 10.1038/nature11263

  View details for Web of Science ID 000307501000045

  View details for PubMedID 22810587

  View details for PubMedCentralID PMC3422434

• Modeling Pathogenesis in Familial Hypertrophic Cardiomyopathy Using Patient-Specific Induced Pluripotent Stem Cells Basic Cardiovascular Sciences Scientific Session Lan, F., Lee, A., Liang, P., Navarrete, E., Wang, L., Leng, H., Sanchez, V., Yen, M., Wang, Y., Nguyen, P., Sun, N., Abilez, O., Lewis, R., Yamaguchi, Y., Ashley, E., Bers, D., Robbins, R., Longaker, M., Wu, J. LIPPINCOTT WILLIAMS & WILKINS. 2012

  View details for Web of Science ID 000312506400056

• In Situ Optical Mapping of Voltage and Calcium in the Heart PLOS ONE Lee, P., Taghavi, F., Yan, P., Ewart, P., Ashley, E. A., Loew, L. M., Kohl, P., Bollensdorff, C., Woods, C. E. 2012; 7 (8)

  Abstract

  Electroanatomic mapping the interrelation of intracardiac electrical activation with anatomic locations has become an important tool for clinical assessment of complex arrhythmias. Optical mapping of cardiac electrophysiology combines high spatiotemporal resolution of anatomy and physiological function with fast and simultaneous data acquisition. If applied to the clinical setting, this could improve both diagnostic potential and therapeutic efficacy of clinical arrhythmia interventions. The aim of this study was to explore this utility in vivo using a rat model. To this aim, we present a single-camera imaging and multiple light-emitting-diode illumination system that reduces economic and technical implementation hurdles to cardiac optical mapping. Combined with a red-shifted calcium dye and a new near-infrared voltage-sensitive dye, both suitable for use in blood-perfused tissue, we demonstrate the feasibility of in vivo multi-parametric imaging of the mammalian heart. Our approach combines recording of electrophysiologically-relevant parameters with observation of structural substrates and is adaptable, in principle, to trans-catheter percutaneous approaches.

  View details for DOI 10.1371/journal.pone.0042562

  View details for Web of Science ID 000307184700055

  View details for PubMedID 22876327

  View details for PubMedCentralID PMC3411684

• A public resource facilitating clinical use of genomes PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Ball, M. P., Thakuria, J. V., Zaranek, A. W., Clegg, T., Rosenbaum, A. M., Wu, X., Angrist, M., Bhak, J., Bobe, J., Callow, M. J., Cano, C., Chou, M. F., Chung, W. K., Douglas, S. M., Estep, P. W., Gore, A., Hulick, P., Labarga, A., Lee, J., Lunshof, J. E., Kim, B. C., Kim, J., Li, Z., Murray, M. F., Nilsen, G. B., Peters, B. A., Raman, A. M., Rienhoff, H. Y., Robasky, K., Wheeler, M. T., Vandewege, W., Vorhaus, D. B., Yang, J. L., Yang, L., Aach, J., Ashley, E. A., Drmanac, R., Kim, S., Li, J. B., Peshkin, L., Seidman, C. E., Seo, J., Zhang, K., Rehm, H. L., Church, G. M. 2012; 109 (30): 11920-11927

  Abstract

  Rapid advances in DNA sequencing promise to enable new diagnostics and individualized therapies. Achieving personalized medicine, however, will require extensive research on highly reidentifiable, integrated datasets of genomic and health information. To assist with this, participants in the Personal Genome Project choose to forgo privacy via our institutional review board- approved "open consent" process. The contribution of public data and samples facilitates both scientific discovery and standardization of methods. We present our findings after enrollment of more than 1,800 participants, including whole-genome sequencing of 10 pilot participant genomes (the PGP-10). We introduce the Genome-Environment-Trait Evidence (GET-Evidence) system. This tool automatically processes genomes and prioritizes both published and novel variants for interpretation. In the process of reviewing the presumed healthy PGP-10 genomes, we find numerous literature references implying serious disease. Although it is sometimes impossible to rule out a late-onset effect, stringent evidence requirements can address the high rate of incidental findings. To that end we develop a peer production system for recording and organizing variant evaluations according to standard evidence guidelines, creating a public forum for reaching consensus on interpretation of clinically relevant variants. Genome analysis becomes a two-step process: using a prioritized list to record variant evaluations, then automatically sorting reviewed variants using these annotations. Genome data, health and trait information, participant samples, and variant interpretations are all shared in the public domain-we invite others to review our results using our participant samples and contribute to our interpretations. We offer our public resource and methods to further personalized medical research.

  View details for DOI 10.1073/pnas.1201904109

  View details for Web of Science ID 000306992700018

  View details for PubMedID 22797899

  View details for PubMedCentralID PMC3409785

• The Prognostic Utility of Cardiopulmonary Exercise Testing Stands the Test of Time in Patients With Heart Failure JOURNAL OF CARDIOPULMONARY REHABILITATION AND PREVENTION Arena, R., Guazzi, M., Myers, J., Chase, P., Bensimhon, D., Cahalin, L. P., Peberdy, M. A., Ashley, E., West, E., Forman, D. E. 2012; 32 (4): 198-202

  Abstract

  While the medical management strategy for patients with heart failure (HF) has dramatically changed, cardiopulmonary exercise testing (CPX) procedures and the data obtained have remained relatively stable. We are unaware of any previous investigation that has assessed differences in the prognostic utility of CPX in HF according to time period, reflecting differences in the clinical management of systolic HF.Subjects (n = 381) underwent CPX between April 1, 1993, and December 31, 2005, and the remaining 511 were tested between January 1, 2006, and October 28, 2010. Peak oxygen uptake ((Equation is included in full-text article.)O2) and the minute ventilation/carbon dioxide production ((Equation is included in full-text article.)E/(Equation is included in full-text article.)CO2) slope were ascertained for all tests.Both the (Equation is included in full-text article.)E/(Equation is included in full-text article.)CO2 slope and peak (Equation is included in full-text article.)O2 were strong univariate predictors of adverse events in both subgroups. In the multivariate analysis, the (Equation is included in full-text article.)E/(Equation is included in full-text article.)CO2 slope was the strongest predictive marker while peak (Equation is included in full-text article.)O2 added predictive value and was retained in the regression for all scenarios. In subjects undergoing CPX before 2006, a (Equation is included in full-text article.)E/(Equation is included in full-text article.)CO2 slope 45 or greater and a peak (Equation is included in full-text article.)O2 of less than 10 mL · kg · min generated a hazard ratio of 4.2 (95% CI: 1.9-9.1, P < .001) when considering only mortality as an endpoint. In subjects undergoing CPX after 2006, a (Equation is included in full-text article.)E/(Equation is included in full-text article.)CO2 slope 45 or greater and a peak (Equation is included in full-text article.)O2 of less than 10 mL · kg · min generated a hazard ratio of 8.2 (95% CI: 4.7-14.3, P < .001) when considering only mortality as an endpoint.The results of this study indicate that CPX continues to be a valuable clinical assessment in the present-day HF management.

  View details for DOI 10.1097/HCR.0b013e318259f153

  View details for Web of Science ID 000306115400005

  View details for PubMedID 22760244

• Prognostic Implications of Q Waves and T-Wave Inversion Associated With Early Repolarization MAYO CLINIC PROCEEDINGS Uberoi, A., Sallam, K., Perez, M., Jain, N. A., Ashley, E., Froelicher, V. 2012; 87 (7): 614-619

  Abstract

  To evaluate the prevalence of early polarization (ER) in a stable population and to evaluate the prognostic significance of the association or absence of Q waves or T-wave inversion (TWI).In this retrospective study performed at the university-affiliated Palo Alto Veterans Affairs Health Care Center from March 1, 1987, through December 31, 1999, we evaluated outpatient electrocardiograms. Vital status and cause of death were determined in all patients, with a mean ± SD follow-up of 7.6±3.8 years.Of the 29,281 patients, 87% were men and 13% were African American. Inferior or lateral ER was present in 664 patients (2.3%): in inferior leads in 185 (0.6%), in lateral leads in 479 (1.6%) , and in both inferior and lateral leads in 163 (0.6%). Only when Q waves or TWI accompanied ER was there an increased risk of cardiovascular death (Cox proportional hazards regression model, 5.0; 95% confidence interval, 3.4-7.2; P<.001).Common patterns of ER without concomitant Q waves or TWI are not associated with increased risk of cardiovascular death; however, when either occurs with ER, there is a hazard ratio of 5.0. These findings confirm that ER is a benign entity; however, the presence of Q waves or TWI with ER is predictive of increased cardiovascular death.

  View details for DOI 10.1016/j.mayocp.2012.04.009

  View details for PubMedID 22766081

• Personalized medicine: hope or hype? EUROPEAN HEART JOURNAL Salari, K., Watkins, H., Ashley, E. A. 2012; 33 (13): 1564-U29

  Abstract

  Medicine has always been personalized. For years, physicians have incorporated environmental, behavioural, and genetic factors that affect disease and drug response into patient management decisions. However, until recently, the 'genetic' data took the form of family history and self-reported race/ethnicity. As genome sequencing declines in cost, the availability of specific genomic information will no longer be limiting. Rather, our ability to parse these data and our decision whether to use it will become primary. As our understanding of genetic association with drug responses and diseases continues to improve, clinically useful genetic tests may emerge to improve upon our previous methods of assessing genetic risks. Indeed, genetic tests for monogenic disorders have already proven useful. Such changes may usher in a new era of personalized medicine. In this review, we will discuss the utility and limitations of personal genomic data in three domains: pharmacogenomics, assessment of genetic predispositions for common diseases, and identification of rare disease-causing genetic variants.

  View details for DOI 10.1093/eurheartj/ehs112

  View details for Web of Science ID 000306143000014

  View details for PubMedID 22659199

  View details for PubMedCentralID PMC3388016

• Cell-Intrinsic Functional Effects of the alpha-Cardiac Myosin Arg-403-Gln Mutation in Familial Hypertrophic Cardiomyopathy BIOPHYSICAL JOURNAL Chuan, P., Sivaramakrishnan, S., Ashley, E. A., Spudich, J. A. 2012; 102 (12): 2782-2790

  Abstract

  Human familial hypertrophic cardiomyopathy is the most common Mendelian cardiovascular disease worldwide. Among the most severe presentations of the disease are those in families heterozygous for the mutation R403Q in ?-cardiac myosin. Mice heterozygous for this mutation in the ?-cardiac myosin isoform display typical familial hypertrophic cardiomyopathy pathology. Here, we study cardiomyocytes from heterozygous 403/+ mice. The effects of the R403Q mutation on force-generating capabilities and dynamics of cardiomyocytes were investigated using a dual carbon nanofiber technique to measure single-cell parameters. We demonstrate the Frank-Starling effect at the single cardiomyocyte level by showing that cell stretch causes an increase in amplitude of contraction. Mutant 403/+ cardiomyocytes exhibit higher end-diastolic and end-systolic stiffness than +/+ cardiomyocytes, whereas active force generation capabilities remain unchanged. Additionally, 403/+ cardiomyocytes show slowed relaxation dynamics. These phenotypes are consistent with increased end-diastolic and end-systolic chamber elastance, as well as diastolic dysfunction seen at the level of the whole heart. Our results show that these functional effects of the R403Q mutation are cell-intrinsic, a property that may be a general phenomenon in familial hypertrophic cardiomyopathy.

  View details for DOI 10.1016/j.bpj.2012.04.049

  View details for Web of Science ID 000305546500012

  View details for PubMedID 22735528

  View details for PubMedCentralID PMC3379014

• Randomized Trial of Personal Genomics for Preventive Cardiology Design and Challenges CIRCULATION-CARDIOVASCULAR GENETICS Knowles, J. W., Assimes, T. L., Kiernan, M., Pavlovic, A., Goldstein, B. A., Yank, V., McConnell, M. V., Absher, D., Bustamante, C., Ashley, E. A., Ioannidis, J. P. 2012; 5 (3): 368-376

  View details for DOI 10.1161/CIRCGENETICS.112.962746

  View details for PubMedID 22715281

• Whole-Genome Sequencing in Personalized Therapeutics CLINICAL PHARMACOLOGY & THERAPEUTICS Cordero, P., Ashley, E. A. 2012; 91 (6): 1001-1009

  Abstract

  Eleven years since the initial drafts of the human genome were published, we have begun to see the first examples of the application of whole-genome sequencing to personalized diagnosis and therapeutics. The exponential decline in sequencing costs and the constant improvement in these technologies promise to further advance the use of a patient's full genetic profile in the clinic. However, realizing the potential benefit of such sequencing will require a concerted effort by science, medicine, law, and management. In this review, we discuss current approaches to decoding the 6 billion-letter genetic code of a whole genome in a clinical context, give current examples of translating this information into therapy-guiding knowledge, and list the challenges that will need to be surmounted before these powerful data can be fully exploited to forward the goals of personalized medicine.

  View details for DOI 10.1038/clpt.2012.51

  View details for Web of Science ID 000304245800018

  View details for PubMedID 22549284

• Apelin Enhances Directed Cardiac Differentiation of Mouse and Human Embryonic Stem Cells PLOS ONE Wang, I. E., Wang, X., Ge, X., Anderson, J., Ho, M., Ashley, E., Liu, J., Butte, M. J., Yazawa, M., Dolmetsch, R. E., Quertermous, T., Yang, P. C. 2012; 7 (6)

  Abstract

  Apelin is a peptide ligand for an orphan G-protein coupled receptor (APJ receptor) and serves as a critical gradient for migration of mesodermal cells fated to contribute to the myocardial lineage. The present study was designed to establish a robust cardiac differentiation protocol, specifically, to evaluate the effect of apelin on directed differentiation of mouse and human embryonic stem cells (mESCs and hESCs) into cardiac lineage. Different concentrations of apelin (50, 100, 500 nM) were evaluated to determine its differentiation potential. The optimized dose of apelin was then combined with mesodermal differentiation factors, including BMP-4, activin-A, and bFGF, in a developmentally specific temporal sequence to examine the synergistic effects on cardiac differentiation. Cellular, molecular, and physiologic characteristics of the apelin-induced contractile embryoid bodies (EBs) were analyzed. It was found that 100 nM apelin resulted in highest percentage of contractile EB for mESCs while 500 nM had the highest effects on hESCs. Functionally, the contractile frequency of mESCs-derived EBs (mEBs) responded appropriately to increasing concentration of isoprenaline and diltiazem. Positive phenotype of cardiac specific markers was confirmed in the apelin-treated groups. The protocol, consisting of apelin and mesodermal differentiation factors, induced contractility in significantly higher percentage of hESC-derived EBs (hEBs), up-regulated cardiac-specific genes and cell surface markers, and increased the contractile force. In conclusion, we have demonstrated that the treatment of apelin enhanced cardiac differentiation of mouse and human ESCs and exhibited synergistic effects with mesodermal differentiation factors.

  View details for DOI 10.1371/journal.pone.0038328

  View details for PubMedID 22675543

• Systems-Based Approaches to Cardiovascular Biomarker Discovery CIRCULATION-CARDIOVASCULAR GENETICS Azuaje, F. J., Dewey, F. E., Brutsaert, D. L., Devaux, Y., Ashley, E. A., Wagner, D. R. 2012; 5 (3): 360-367

  View details for DOI 10.1161/CIRCGENETICS.112.962977

  View details for Web of Science ID 000309884900016

  View details for PubMedID 22715280

• Clopidogrel: A Case for Indication-Specific Pharmacogenetics CLINICAL PHARMACOLOGY & THERAPEUTICS Johnson, J. A., Roden, D. M., Lesko, L. J., Ashley, E., Klein, T. E., Shuldiner, A. R. 2012; 91 (5): 774-776

  Abstract

  The CYP2C19*2 loss-of-function allele is associated with reduced generation of active metabolites of clopidogrel. However, meta-analyses have supported or discounted the impact of genotype on adverse cardiovascular outcomes during clopidogrel therapy, depending on studies included in the analysis. Here we review these data and conclude that evidence supports a differential effect of genotype on protection from major adverse cardiovascular outcomes following percutaneous coronary intervention (PCI), but not for other clopidogrel indications.

  View details for DOI 10.1038/clpt.2012.21

  View details for Web of Science ID 000303047400009

  View details for PubMedID 22513313

  View details for PubMedCentralID PMC3382015

• Patient-Specific Induced Pluripotent Stem Cells as a Model for Familial Dilated Cardiomyopathy SCIENCE TRANSLATIONAL MEDICINE Sun, N., Yazawa, M., Liu, J., Han, L., Sanchez-Freire, V., Abilez, O. J., Navarrete, E. G., Hu, S., Wang, L., Lee, A., Pavlovic, A., Lin, S., Chen, R., Hajjar, R. J., Snyder, M. P., Dolmetsch, R. E., Butte, M. J., Ashley, E. A., Longaker, M. T., Robbins, R. C., Wu, J. C. 2012; 4 (130)

  Abstract

  Characterized by ventricular dilatation, systolic dysfunction, and progressive heart failure, dilated cardiomyopathy (DCM) is the most common form of cardiomyopathy in patients. DCM is the most common diagnosis leading to heart transplantation and places a significant burden on healthcare worldwide. The advent of induced pluripotent stem cells (iPSCs) offers an exceptional opportunity for creating disease-specific cellular models, investigating underlying mechanisms, and optimizing therapy. Here, we generated cardiomyocytes from iPSCs derived from patients in a DCM family carrying a point mutation (R173W) in the gene encoding sarcomeric protein cardiac troponin T. Compared to control healthy individuals in the same family cohort, cardiomyocytes derived from iPSCs from DCM patients exhibited altered regulation of calcium ion (Ca(2+)), decreased contractility, and abnormal distribution of sarcomeric ?-actinin. When stimulated with a ?-adrenergic agonist, DCM iPSC-derived cardiomyocytes showed characteristics of cellular stress such as reduced beating rates, compromised contraction, and a greater number of cells with abnormal sarcomeric ?-actinin distribution. Treatment with ?-adrenergic blockers or overexpression of sarcoplasmic reticulum Ca(2+) adenosine triphosphatase (Serca2a) improved the function of iPSC-derived cardiomyocytes from DCM patients. Thus, iPSC-derived cardiomyocytes from DCM patients recapitulate to some extent the morphological and functional phenotypes of DCM and may serve as a useful platform for exploring disease mechanisms and for drug screening.

  View details for DOI 10.1126/scitranslmed.3003552

  View details for Web of Science ID 000303045900004

  View details for PubMedID 22517884

  View details for PubMedCentralID PMC3657516

• The prognostic value of early repolarization with ST-segment elevation in African Americans HEART RHYTHM Perez, M. V., Uberoi, A., Jain, N. A., Ashley, E., Turakhia, M. P., Froelicher, V. 2012; 9 (4): 558-565

  Abstract

  Increased prevalence of classic early repolarization, defined as ST-segment elevation (STE) in the absence of acute myocardial injury, in African Americans is well established. The prognostic value of this pattern in different ethnicities remains controversial.Measure association between early repolarization and cardiovascular mortality in African Americans.The resting electrocardiograms of 45,829 patients were evaluated at the Palo Alto Veterans Affairs Hospital. Subjects with inpatient status or electrocardiographic evidence of acute myocardial infarction were excluded, leaving 29,281 subjects. ST-segment elevation, defined as an elevation of >0.1 mV at the end of the QRS, was electronically flagged and visually adjudicated by 3 observers blinded to outcomes. An association between ethnicity and early repolarization was measured by using multivariate logistic regression. We analyzed associations between early repolarization and cardiovascular mortality by using the Cox proportional hazards regression analysis.Subjects were 13% women and 13.3% African Americans, with an average age of 55 years and followed for an average of 7.6 years, resulting in 1995 cardiovascular deaths. There were 479 subjects with lateral STE and 185 with inferior STE. After adjustment for age, sex, heart rate, and coronary artery disease, African American ethnicity was associated with lateral or inferior STE (odds ratio 3.1; P = .0001). While lateral or inferior STE in non-African Americans was independently associated with cardiovascular death (hazard ratio 1.6; P = .02), it was not associated with cardiovascular death in African Americans (hazard ratio 0.75; P = .50).Although early repolarization is more prevalent in African Americans, it is not predictive of cardiovascular death in this population and may represent a distinct electrophysiologic phenomenon.

  View details for DOI 10.1016/j.hrthm.2011.11.020

  View details for PubMedID 22094072

• Independent Determinants of Septal Curvature in Patients with Pulmonary Arterial Hypertension Haddad, F., Denault, A. Y., Shkiri, M., Guihaire, J., Mercier, O., Gomari, F., Ashley, E., Fadel, E., Zamanian, R., Schnittger, I. ELSEVIER SCIENCE INC. 2012: S80

  View details for DOI 10.1016/j.healun.2012.01.214

  View details for Web of Science ID 000302207900215

• PROGNOSTIC IMPLICATIONS OF Q WAVES AND T WAVE INVERSION ASSOCIATED WITH EARLY REPOLARIZATION 61st Annual Scientific Session and Expo of the American-College-of-Cardiology (ACC)/Conference on ACC-i2 with TCT Uberoi, A. (., Sallam, K., Perez, M., Jain, N. A., Ashley, E., Froelicher, V. ELSEVIER SCIENCE INC. 2012: E567?E567

  View details for Web of Science ID 000302326700568

• Personal Omics Profiling Reveals Dynamic Molecular and Medical Phenotypes CELL Chen, R., Mias, G. I., Li-Pook-Than, J., Jiang, L., Lam, H. Y., Chen, R., Miriami, E., Karczewski, K. J., Hariharan, M., Dewey, F. E., Cheng, Y., Clark, M. J., Im, H., Habegger, L., Balasubramanian, S., O'Huallachain, M., Dudley, J. T., Hillenmeyer, S., Haraksingh, R., Sharon, D., Euskirchen, G., Lacroute, P., Bettinger, K., Boyle, A. P., Kasowski, M., Grubert, F., Seki, S., Garcia, M., Whirl-Carrillo, M., Gallardo, M., Blasco, M. A., Greenberg, P. L., Snyder, P., Klein, T. E., Altman, R. B., Butte, A. J., Ashley, E. A., Gerstein, M., Nadeau, K. C., Tang, H., Snyder, M. 2012; 148 (6): 1293-1307

  Abstract

  Personalized medicine is expected to benefit from combining genomic information with regular monitoring of physiological states by multiple high-throughput methods. Here, we present an integrative personal omics profile (iPOP), an analysis that combines genomic, transcriptomic, proteomic, metabolomic, and autoantibody profiles from a single individual over a 14 month period. Our iPOP analysis revealed various medical risks, including type 2 diabetes. It also uncovered extensive, dynamic changes in diverse molecular components and biological pathways across healthy and diseased conditions. Extremely high-coverage genomic and transcriptomic data, which provide the basis of our iPOP, revealed extensive heteroallelic changes during healthy and diseased states and an unexpected RNA editing mechanism. This study demonstrates that longitudinal iPOP can be used to interpret healthy and diseased states by connecting genomic information with additional dynamic omics activity.

  View details for DOI 10.1016/j.cell.2012.02.009

  View details for PubMedID 22424236

• DNA Sequencing Clinical Applications of New DNA Sequencing Technologies CIRCULATION Dewey, F. E., Pan, S., Wheeler, M. T., Quake, S. R., Ashley, E. A. 2012; 125 (7): 931-944

  View details for DOI 10.1161/CIRCULATIONAHA.110.972828

  View details for Web of Science ID 000300949800019

  View details for PubMedID 22354974

  View details for PubMedCentralID PMC3364518

• The relationship between minute ventilation and oxygen consumption in heart failure: Comparing peak VE/VO2 and the oxygen uptake efficiency slope INTERNATIONAL JOURNAL OF CARDIOLOGY Arena, R., Guazzi, M., Myers, J., Chase, P., Bensimhon, D., Cahalin, L. P., Peberdy, M., Ashley, E., West, E., Forman, D. E. 2012; 154 (3): 384?85

  View details for DOI 10.1016/j.ijcard.2011.11.038

  View details for Web of Science ID 000299317900054

  View details for PubMedID 22188985

• Performance comparison of whole-genome sequencing platforms NATURE BIOTECHNOLOGY Lam, H. Y., Clark, M. J., Chen, R., Chen, R., Natsoulis, G., O'Huallachain, M., Dewey, F. E., Habegger, L., Ashley, E. A., Gerstein, M. B., Butte, A. J., Ji, H. P., Snyder, M. 2012; 30 (1): 78-U118

  View details for DOI 10.1038/nbt.2065

  View details for Web of Science ID 000299110600023

• Image-Based Functional Assay to Screen Therapies for Inherited Heart Disease. Simmons, C., Zaleta-Rivera, K. L., Ribeiro, A., Ashley, E., Pruitt, B. L. AMER SOC CELL BIOLOGY. 2012

  View details for Web of Science ID 000209348603127

• Exercise oscillatory ventilation reflects diminished quality of life and perceived functional capacity in patients with heart failure INTERNATIONAL JOURNAL OF CARDIOLOGY Arena, R., Guazzi, M., Myers, J., Chase, P., Bensimhon, D., Cahalin, L., Peberdy, M. A., Ashley, E., West, E., Forman, D. E. 2011; 153 (2): 213-214

  View details for DOI 10.1016/j.ijcard.2011.09.072

  View details for Web of Science ID 000297249400027

  View details for PubMedID 21993226

• Personalized Medicine and Cardiovascular Disease: From Genome to Bedside CURRENT CARDIOVASCULAR RISK REPORTS Pan, S., Dewey, F. E., Perez, M. V., Knowles, J. W., Chen, R., Butte, A. J., Ashley, E. A. 2011; 5 (6): 542?51

  View details for DOI 10.1007/s12170-011-0202-4

  View details for Web of Science ID 000219926300009

• Network Analysis Identifies the Orphan Receptor Tyrosine Kinase Ros1 as a Determinant of Glutathione Peroxidase-1 Mediated Vascular Remodeling Scientific Sessions of the American-Heart-Association/Resuscitation Science Symposium Ali, Z. A., Perez, V. D., Raiesdana, A., Leeper, N. J., Pan, S., Qu, X., Ali, A., Haghighat, R., Kato, K., Channon, K. M., Rabinovitch, M., Quertermous, T., Ashley, E. A. LIPPINCOTT WILLIAMS & WILKINS. 2011

  View details for Web of Science ID 000299738703092

• Cardiovascular Magnetic Resonance Imaging Elucidates Genotype-Phenotype Relationships in Patients with Hypertrophic Cardiomyopathy Scientific Sessions of the American-Heart-Association/Resuscitation Science Symposium Heidary, S., Wheeler, M. T., Bennett, M. V., Chung, J., Pavlovic, A., Parent, M., Dash, R., McConnell, M. V., Ashley, E. A., Yang, P. C. LIPPINCOTT WILLIAMS & WILKINS. 2011

  View details for Web of Science ID 000299738705331

• Patient-Specific Induced Pluripotent Stem Cell as a Model for Familial Dilated Cardiomyopathy Scientific Sessions of the American-Heart-Association/Resuscitation Science Symposium Sun, N., Yazawa, M., Liu, J., Han, L., Sanchez-Freire, V., Hu, S., Ricardo, D., Butte, M., Ashley, E., Longaker, M., Robbins, R., Wu, J. LIPPINCOTT WILLIAMS & WILKINS. 2011

  View details for Web of Science ID 000299738705089

• Early Repolarization in an Ambulatory Clinical Population CIRCULATION Uberoi, A., Jain, N. A., Perez, M., Weinkopff, A., Ashley, E., Hadley, D., Turakhia, M. P., Froelicher, V. 2011; 124 (20): 2208-2214

  Abstract

  The significance of early repolarization, particularly regarding the morphology of the R-wave downslope, has come under question.We evaluated 29 281 resting ambulatory ECGs from the VA Palo Alto Health Care System. With PR interval as the isoelectric line and amplitude criteria ?0.1 mV, ST-segment elevation is defined at the end of the QRS, J wave as an upward deflection, and slur as a conduction delay on the QRS downstroke. Associations of ST-segment elevation patterns, J waves, and slurs with cardiovascular mortality were analyzed with Cox analysis. With a median follow-up of 7.6 years, there were 1995 cardiac deaths. Of 29 281 subjects, 87% were male (55±14 years) and 13% were female (56±17 years); 13% were black, 6% were Hispanic, and 81% were white or other. Six hundred sixty-four (2.3%) had inferior or lateral ST-segment elevation: 185 (0.6%) in inferior leads and 479 (1.6%) in lateral leads, 163 (0.6%) in both, and 0.4% had global elevation. A total of 4041 ECGs were analyzed with enhanced display, and 583 (14%) had J waves or slurring, which were more prevalent in those with than in those without ST-segment elevation (61% versus 13%; P<0.001). ST-segment elevation occurred more in those with than in those without J waves or slurs (12% versus 1.3%; P<0.001). Except when involving only inferior leads, all components of early repolarization were more common in young individuals, male subjects, blacks, and those with bradycardia. All patterns and components of early repolarization were associated with decreased cardiovascular mortality, but this was not significant after adjustment for age.We found no significant association between any components of early repolarization and cardiac mortality.

  View details for DOI 10.1161/CIRCULATIONAHA.111.047191

  View details for PubMedID 21986288

• Insights from Network Analysis: Deficiency of Glutathione Peroxidase-1 Increases In-stent Stenosis 23rd Annual Scientific Symposium of Transcatheter Cardiovascular Therapeutics (TCT) Ali, Z. A., Raiesdana, A., Qu, X., Patel, S., Keyghobadi, F., Saeed, A., Quertermous, T., Ashley, E. ELSEVIER SCIENCE INC. 2011: B122?B122

  View details for Web of Science ID 000296891900451

• Phased Whole-Genome Genetic Risk in a Family Quartet Using a Major Allele Reference Sequence PLOS GENETICS Dewey, F. E., Chen, R., Cordero, S. P., Ormond, K. E., Caleshu, C., Karczewski, K. J., Whirl-Carrillo, M., Wheeler, M. T., Dudley, J. T., Byrnes, J. K., Cornejo, O. E., Knowles, J. W., Woon, M., Sangkuhl, K., Gong, L., Thorn, C. F., Hebert, J. M., Capriotti, E., David, S. P., Pavlovic, A., West, A., Thakuria, J. V., Ball, M. P., Zaranek, A. W., Rehm, H. L., Church, G. M., West, J. S., Bustamante, C. D., Snyder, M., Altman, R. B., Klein, T. E., Butte, A. J., Ashley, E. A. 2011; 7 (9)

  Abstract

  Whole-genome sequencing harbors unprecedented potential for characterization of individual and family genetic variation. Here, we develop a novel synthetic human reference sequence that is ethnically concordant and use it for the analysis of genomes from a nuclear family with history of familial thrombophilia. We demonstrate that the use of the major allele reference sequence results in improved genotype accuracy for disease-associated variant loci. We infer recombination sites to the lowest median resolution demonstrated to date (< 1,000 base pairs). We use family inheritance state analysis to control sequencing error and inform family-wide haplotype phasing, allowing quantification of genome-wide compound heterozygosity. We develop a sequence-based methodology for Human Leukocyte Antigen typing that contributes to disease risk prediction. Finally, we advance methods for analysis of disease and pharmacogenomic risk across the coding and non-coding genome that incorporate phased variant data. We show these methods are capable of identifying multigenic risk for inherited thrombophilia and informing the appropriate pharmacological therapy. These ethnicity-specific, family-based approaches to interpretation of genetic variation are emblematic of the next generation of genetic risk assessment using whole-genome sequencing.

  View details for DOI 10.1371/journal.pgen.1002280

  View details for PubMedID 21935354

• The Impact of ST Elevation on Athletic Screening CLINICAL JOURNAL OF SPORT MEDICINE Leo, T., Uberoi, A., Jain, N. A., Garza, D., Chowdhury, S., Freeman, J. V., Perez, M., Ashley, E., Froelicher, V. 2011; 21 (5): 433-440

  Abstract

  To demonstrate the prevalence and patterns of ST elevation (STE) in ambulatory individuals and athletes and compare the clinical outcomes.Retrospective cohort study. ST elevation was measured by computer algorithm and defined as ?0.1 mV at the end of the QRS complex. Elevation was confirmed, and J waves and slurring were coded visually.Veterans Affairs Palo Alto Health Care System and Stanford University varsity athlete screening evaluation.Overall, 45 829 electrocardiograms (ECGs) were obtained from the clinical patient cohort and 658 ECGs from athletes. We excluded inpatients and those with ECG abnormalities, leaving 20 901 outpatients and 641 athletes.Electrocardiogram evaluation and follow-up for vital status.All-cause and cardiovascular mortality and cardiac events.ST elevation in the anterior and lateral leads was more prevalent in men and in African Americans and inversely related to age and resting heart rate. Athletes had a higher prevalence of early repolarization even when matched for age and gender with nonathletes. ST elevation greater than 0.2 mV (2 mm) was very unusual. ST elevation was not associated with cardiac death in the clinical population or with cardiac events or abnormal test results in the athletes.Early repolarization is not associated with cardiac death and has patterns that help distinguish it from STE associated with cardiac conditions, such as myocardial ischemia or injury, pericarditis, and the Brugada syndrome.

  View details for DOI 10.1097/JSM.0B013E31822CF105

  View details for PubMedID 21892017

• Interpretation of the Electrocardiogram of Young Athletes CIRCULATION Uberoi, A., Stein, R., Perez, M. V., Freeman, J., Wheeler, M., Dewey, F., Peidro, R., Hadley, D., Drezner, J., Sharma, S., Pelliccia, A., Corrado, D., Niebauer, J., Estes, M., Ashley, E., Froelicher, V. 2011; 124 (6): 746-757

  View details for DOI 10.1161/CIRCULATIONAHA.110.013078

  View details for PubMedID 21824936

• Hearts From DCD Donors Display Acceptable Biventricular Function After Heart Transplantation in Pigs AMERICAN JOURNAL OF TRANSPLANTATION Ali, A. A., White, P., Xiang, B., Lin, H., Tsui, S. S., Ashley, E., LEE, T. W., Klein, J. R., Kumar, K., Arora, R. C., Large, S. R., Tian, G., Freed, D. H. 2011; 11 (8): 1621-1632

  Abstract

  Cardiac transplantation is in decline, in contrast to other solid organs where the number of solid organ transplants from donors after circulatory death (DCD) is increasing. Hearts from DCD donors are not currently utilized due to concerns that they may suffer irreversible cardiac injury with resultant poor graft function. Using a large animal model, we tested the hypothesis that hearts from DCD donors would be suitable for transplantation. Donor pigs were subjected to hypoxic cardiac arrest (DCD) followed by 15 min of warm ischemia and resuscitation on cardiopulmonary bypass, or brainstem death (BSD) via intracerebral balloon inflation. Cardiac function was assessed through load-independent measures and magnetic resonance imaging and spectroscopy. After resuscitation, DCD hearts had near normal contractility, although stroke volume was reduced, comparable to BSD hearts. DCD hearts had a significant decline in phosphocreatine and increase in inorganic phosphate during the hypoxic period, with a return to baseline levels after reperfusion. After transplantation, cardiac function was comparable between BSD and DCD groups. Therefore, in a large animal model, the DCD heart maintains viability and recovers function similar to that of the BSD heart and may be suitable for clinical transplantation. Further study is warranted on optimal reperfusion strategies.

  View details for DOI 10.1111/j.1600-6143.2011.03622.x

  View details for Web of Science ID 000293340900015

  View details for PubMedID 21749639

• Modulation of atrial electrophysiology and oxidative stress by the endogenous peptide hormone apelin: implications in human atrial fibrillation Kim, Y. M., Sachedina, A., Singh, M. H., Ray, S., Zhang, L., Ruiz-Lozano, P., Verma, S., Casadei, B., Ashley, E. A., Backx, P. H. OXFORD UNIV PRESS. 2011: 941?942

  View details for Web of Science ID 000208702707019

• Systems biology of heart failure, challenges and hopes CURRENT OPINION IN CARDIOLOGY Dewey, F. E., Wheeler, M. T., Ashley, E. A. 2011; 26 (4): 314-321

  Abstract

  Heart failure remains a leading cause of morbidity and mortality in developed nations. Our current understanding of molecular pathways involved in heart failure reveals little of the multiscale biological systems at work. Here we consider recent advances in understanding the integrative multiscale biology, or systems biology, of heart failure and present a framework for future work in the area.Multiplexed assays of gene expression and the complex dynamics of protein-protein interactions in heart failure have illuminated key pathways important to myocardial adaptation. Modeling of complex systems has advanced to incorporate these dynamic data sources into networks that capture fundamental interactions on different biological scales. The complex syndrome of heart failure, like other complex disease syndromes, can be viewed as an emergent property of these multiscale systems.A comprehensive understanding of adaptive mechanisms in heart failure requires integration of multiple data sources on several biological scales. A combination of holistic systems biology approaches and traditional reductionist experimentation will be required for a nuanced understanding of this multifaceted disease process.

  View details for DOI 10.1097/HCO.0b013e328346597d

  View details for Web of Science ID 000291424400007

  View details for PubMedID 21478745

• GENETIC DETERMINANTS OF DRAMATIC IMPROVEMENT IN LEFT VENTRICULAR FUNCTION IN PATIENTS WITH HEART FAILURE 60th Annual Scientific Session and Expo of the American-College-of-Cardiology (ACC) / I2 Summit / ACCF/Herman K. Gold Young Investigator's Award in Molecular and Cellular Cardiology Perez, M. V., Pavlovic, A., Wheeler, M. T., Dewey, F. E., Bernstein, D., Fowler, M. B., Robbins, R. C., Quertermous, T., Chan, K., Absher, D., Ho, M., Cretti, E., Southwick, A., Rosenthal, D., Myers, R. M., Heidenreich, P., Garrett, L., Sedehi, D., Kao, D., Salisbury, H., Ashley, E. A. ELSEVIER SCIENCE INC. 2011: E2041?E2041

  View details for Web of Science ID 000291695102046

• MOLECULAR AUTOPSY FOR SUDDEN CARDIAC DEATH USING WHOLE GENOME SEQUENCING 60th Annual Scientific Session and Expo of the American-College-of-Cardiology (ACC) / I2 Summit / ACCF/Herman K. Gold Young Investigator's Award in Molecular and Cellular Cardiology Dewey, F. E., Wheeler, M. T., Cordero, S., Perez, M. V., Pavlovic, A., Pushkarev, D., Freeman, J. V., Quake, S. R., Ashley, E. A. ELSEVIER SCIENCE INC. 2011: E1159?E1159

  View details for Web of Science ID 000291695101162

• PREVALENCE AND PATTERNS OF EARLY REPOLARIZATION 60th Annual Scientific Session and Expo of the American-College-of-Cardiology (ACC) / I2 Summit / ACCF/Herman K. Gold Young Investigator's Award in Molecular and Cellular Cardiology Leo, T., Uberoi, A., Chowdhury, S., Chan, K., Jain, N. A., Weinkopff, A., Freeman, J., Ashley, E., Froelicher, V. ELSEVIER SCIENCE INC. 2011: E124?E124

  View details for Web of Science ID 000291695100125

• Hearts from DCD Donors Display Excellent Biventricular Function Following Transplantation 31st Annual Meeting and Scientific Sessions of the International-Society-for-Heart-and-Lung-Transplantation (ISHLT) Ali, A. A., White, P., Xiang, B., Arora, R., Lee, T., Ashley, E., Large, S. R., Tian, G., Freed, D. ELSEVIER SCIENCE INC. 2011: S120?S121

  View details for Web of Science ID 000288924300347

• Intracellular Calcium Handling in the Donor Heart: Comparison between DCD and Brainstem Dead (BSD) Donor Hearts Taghavi, F. J., Ali, A. A., Woods, C., Large, S. R., Ashley, E. A. ELSEVIER SCIENCE INC. 2011: S199

  View details for DOI 10.1016/j.healun.2011.01.606

  View details for Web of Science ID 000288924300590

• Genetic Analysis in Cardiovascular Disease A Clinical Perspective 3rd International Conference on Women, Heart, Disease and Stroke Ho, E., Bhindi, R., Ashley, E. A., Figtree, G. A. LIPPINCOTT WILLIAMS & WILKINS. 2011: 81?89

  Abstract

  Many forms of cardiovascular disease (CVD) demonstrate heritability and thus a genetic contribution is likely. This is most evident when considering the "simple" Mendelian traits such as hypertrophic cardiomyopathy. However, family history also influences our assessment of patients with complex traits such as coronary artery disease, hypertension, and common forms of hypercholesterolemia, as observed in clinical practice. Recent research has led to advances in our understanding of the genetic basis of both the simple and complex forms of CVD. This review presents the current state of knowledge regarding major gene disorders, as well as more common, complex forms of CVD such as coronary artery disease. It discusses the fundamental approaches being used to identify the genetic basis of the various disease states, as well as the practical implications of the discoveries to clinicians. It also focuses on our need to assess the extent by which genetic analysis can alter our calculation of an individual's risk of disease, and our ability to successfully target treatment that will modify this process.

  View details for DOI 10.1097/CRD.0b013e318207ffac

  View details for Web of Science ID 000286875000009

  View details for PubMedID 21285668

• The concept of ventricular reserve in heart failure and pulmonary hypertension: an old metric that brings us one step closer in our quest for prediction CURRENT OPINION IN CARDIOLOGY Haddad, F., Vrtovec, B., Ashley, E. A., Deschamps, A., Haddad, H., Denault, A. Y. 2011; 26 (2): 123-131

  Abstract

  Ventricular reserve is emerging a strong predictor of outcome in heart failure and cardiovascular disease. Ventricular reserve is the term used to describe the extent of increase or change in ventricular function that occurs during exercise or pharmacological stress (typically with dobutamine).The interest in ventricular reserve lies in its ability to assess viability in coronary artery disease, to predict clinical outcome and response to therapy in patients with heart failure and to screen patients for early cardiovascular disease.In this paper, we will review the emerging role of ventricular reserve in heart failure and pulmonary hypertension. We will also explore the mechanisms involved in the pathophysiology of impaired ventricular reserve and discuss future directions of research in the field.

  View details for DOI 10.1097/HCO.0b013e3283437485

  View details for Web of Science ID 000287189400008

  View details for PubMedID 21297465

• Gene Coexpression Network Topology of Cardiac Development, Hypertrophy, and Failure CIRCULATION-CARDIOVASCULAR GENETICS Dewey, F. E., Perez, M. V., Wheeler, M. T., Watt, C., Spin, J., Langfelder, P., Horvath, S., Hannenhalli, S., Cappola, T. P., Ashley, E. A. 2011; 4 (1): 26-U129

  Abstract

  Network analysis techniques allow a more accurate reflection of underlying systems biology to be realized than traditional unidimensional molecular biology approaches. Using gene coexpression network analysis, we define the gene expression network topology of cardiac hypertrophy and failure and the extent of recapitulation of fetal gene expression programs in failing and hypertrophied adult myocardium.We assembled all myocardial transcript data in the Gene Expression Omnibus (n=1617). Because hierarchical analysis revealed species had primacy over disease clustering, we focused this analysis on the most complete (murine) dataset (n=478). Using gene coexpression network analysis, we derived functional modules, regulatory mediators, and higher-order topological relationships between genes and identified 50 gene coexpression modules in developing myocardium that were not present in normal adult tissue. We found that known gene expression markers of myocardial adaptation were members of upregulated modules but not hub genes. We identified ZIC2 as a novel transcription factor associated with coexpression modules common to developing and failing myocardium. Of 50 fetal gene coexpression modules, 3 (6%) were reproduced in hypertrophied myocardium and 7 (14%) were reproduced in failing myocardium. One fetal module was common to both failing and hypertrophied myocardium.Network modeling allows systems analysis of cardiovascular development and disease. Although we did not find evidence for a global coordinated program of fetal gene expression in adult myocardial adaptation, our analysis revealed specific gene expression modules active during both development and disease and specific candidates for their regulation.

  View details for DOI 10.1161/CIRCGENETICS.110.941757

  View details for PubMedID 21127201

• Insights into Human beta-Cardiac Myosin Function from Single Molecule and Single Cell Studies (vol 2, pg 426, 2009) JOURNAL OF CARDIOVASCULAR TRANSLATIONAL RESEARCH Sivaramakrishnan, S., Ashley, E., Leinwand, L., Spudich, J. A. 2011; 4 (1): 114

  View details for DOI 10.1007/s12265-010-9251-1

  View details for Web of Science ID 000286106400016

• BMP promotes motility and represses growth of smooth muscle cells by activation of tandem Wnt pathways JOURNAL OF CELL BIOLOGY Perez, V. A., Ali, Z., Alastalo, T., Ikeno, F., Sawada, H., Lai, Y., Kleisli, T., Spiekerkoetter, E., Qu, X., Rubinos, L. H., Ashley, E., Amieva, M., Dedhar, S., Rabinovitch, M. 2011; 192 (1): 171-188

  Abstract

  We present a novel cell-signaling paradigm in which bone morphogenetic protein 2 (BMP-2) consecutively and interdependently activates the wingless (Wnt)-?-catenin (?C) and Wnt-planar cell polarity (PCP) signaling pathways to facilitate vascular smooth muscle motility while simultaneously suppressing growth. We show that BMP-2, in a phospho-Akt-dependent manner, induces ?C transcriptional activity to produce fibronectin, which then activates integrin-linked kinase 1 (ILK-1) via ?4-integrins. ILK-1 then induces the Wnt-PCP pathway by binding a proline-rich motif in disheveled (Dvl) and consequently activating RhoA-Rac1-mediated motility. Transfection of a Dvl mutant that binds ?C without activating RhoA-Rac1 not only prevents BMP-2-mediated vascular smooth muscle cell motility but promotes proliferation in association with persistent ?C activity. Interfering with the Dvl-dependent Wnt-PCP activation in a murine stented aortic graft injury model promotes extensive neointima formation, as shown by optical coherence tomography and histopathology. We speculate that, in response to injury, factors that subvert BMP-2-mediated tandem activation of Wnt-?C and Wnt-PCP pathways contribute to obliterative vascular disease in both the systemic and pulmonary circulations.

  View details for DOI 10.1083/jcb.201008060

  View details for PubMedID 21220513

• Drug Discovery in a Multidimensional World: Systems, Patterns, and Networks JOURNAL OF CARDIOVASCULAR TRANSLATIONAL RESEARCH Dudley, J. T., Schadt, E., Sirota, M., Butte, A. J., Ashley, E. 2010; 3 (5): 438-447

  Abstract

  Despite great strides in revealing and understanding the physiological and molecular bases of cardiovascular disease, efforts to translate this understanding into needed therapeutic interventions continue to lag far behind the initial discoveries. Although pharmaceutical companies continue to increase investments into research and development, the number of drugs gaining federal approval is in decline. Many factors underlie these trends, and a vast number of technological and scientific innovations are being sought through efforts to reinvigorate drug discovery pipelines. Recent advances in molecular profiling technologies and development of sophisticated computational approaches for analyzing these data are providing new, systems-oriented approaches towards drug discovery. Unlike the traditional approach to drug discovery which is typified by a one-drug-one-target mindset, systems-oriented approaches to drug discovery leverage the parallelism and high-dimensionality of the molecular data to construct more comprehensive molecular models that aim to model broader bimolecular systems. These models offer a means to explore complex molecular states (e.g., disease) where thousands to millions of molecular entities comprising multiple molecular data types (e.g., proteomics and gene expression) can be evaluated simultaneously as components of a cohesive biomolecular system. In this paper, we discuss emerging approaches towards systems-oriented drug discovery and contrast these efforts with the traditional, unidimensional approach to drug discovery. We also highlight several applications of these system-oriented approaches across various aspects of drug discovery, including target discovery, drug repositioning and drug toxicity. When available, specific applications to cardiovascular drug discovery are highlighted and discussed.

  View details for DOI 10.1007/s12265-010-9214-6

  View details for Web of Science ID 000284694700003

  View details for PubMedID 20677029

• Clinical assessment incorporating a personal genome Reply LANCET Morgan, A. A., Chen, R., Butte, A. J., Ashley, E. A. 2010; 376 (9744): 869-870

  View details for Web of Science ID 000282069100019

• Is stress cardiomyopathy the underlying cause of ventricular dysfunction associated with brain death? JOURNAL OF HEART AND LUNG TRANSPLANTATION Berman, M., Ali, A., Ashley, E., Freed, D., Clarke, K., Tsui, S., Parameshwar, J., Large, S. 2010; 29 (9): 957-965

  Abstract

  Most deaths in the first 30 days after cardiac transplantation are due to failure of the donor heart, often with the clinical picture of right ventricular failure. Indeed, there is a significant reduction in contractility of the human donor heart and loss of contractile reserve before and soon after transplantation. This myocardial insult appears in association with brain death in the donor and follows a "catecholamine storm" associated with a rapidly rising intracranial pressure. Microscopy of the myocardium in organ donors shows a picture typical of catecholamine-induced injury and similar to changes found in endomyocardial specimens of stress cardiomyopathy (catecholamine-induced cardiomyopathy, or Takotsubo cardiomyopathy). There are 3 common features between stress cardiomyopathy and the heart of a brain-dead donor: exposure of the heart to unusually high catecholamine levels, ventricular dysfunction, and prompt recovery. Stress cardiomyopathy is a temporary myocardial dysfunction that has been described after sub-arachnoid hemorrhage, traumatic head injury, pheochromocytoma, acute emotional distress, exogenous administration of catecholamines, and non-related surgery. Given the common features of this catecholamine-mediated myocardial insult, we ask if brain-dead donor heart dysfunction is an extreme variant of stress cardiomyopathy? And, if so is it, like stress cardiomyopathy, reversible? Can we therefore expect recovery of the dysfunctional donor heart over time, thereby permitting increased use of hearts offered for transplantation?

  View details for DOI 10.1016/j.healun.2010.04.008

  View details for Web of Science ID 000281494800001

  View details for PubMedID 20627624

• Chromatin regulation by Brg1 underlies heart muscle development and disease NATURE Hang, C. T., Yang, J., Han, P., Cheng, H., Shang, C., Ashley, E., Zhou, B., Chang, C. 2010; 466 (7302): 62-U74

  Abstract

  Cardiac hypertrophy and failure are characterized by transcriptional reprogramming of gene expression. Adult cardiomyocytes in mice primarily express alpha-myosin heavy chain (alpha-MHC, also known as Myh6), whereas embryonic cardiomyocytes express beta-MHC (also known as Myh7). Cardiac stress triggers adult hearts to undergo hypertrophy and a shift from alpha-MHC to fetal beta-MHC expression. Here we show that Brg1, a chromatin-remodelling protein, has a critical role in regulating cardiac growth, differentiation and gene expression. In embryos, Brg1 promotes myocyte proliferation by maintaining Bmp10 and suppressing p57(kip2) expression. It preserves fetal cardiac differentiation by interacting with histone deacetylase (HDAC) and poly (ADP ribose) polymerase (PARP) to repress alpha-MHC and activate beta-MHC. In adults, Brg1 (also known as Smarca4) is turned off in cardiomyocytes. It is reactivated by cardiac stresses and forms a complex with its embryonic partners, HDAC and PARP, to induce a pathological alpha-MHC to beta-MHC shift. Preventing Brg1 re-expression decreases hypertrophy and reverses this MHC switch. BRG1 is activated in certain patients with hypertrophic cardiomyopathy, its level correlating with disease severity and MHC changes. Our studies show that Brg1 maintains cardiomyocytes in an embryonic state, and demonstrate an epigenetic mechanism by which three classes of chromatin-modifying factors-Brg1, HDAC and PARP-cooperate to control developmental and pathological gene expression.

  View details for DOI 10.1038/nature09130

  View details for Web of Science ID 000279343800035

  View details for PubMedID 20596014

  View details for PubMedCentralID PMC2898892

• THE RESUSCITATED NHBD HEART IS FUNCTIONALLY SUPERIOR TO THE BRAINSTEM DEAD DONOR HEART Ali, A., Fajardo, G., Tsuda, S., Budas, G., Ali, Z., Quertermous, T., Bernstein, D., Robbins, R., Fischbein, M., Large, S., Ashley, E. WILEY-BLACKWELL. 2010: 7

  View details for Web of Science ID 000277330800033

• FUNCTIONAL AND METABOLIC RECOVERY OF THE RESUSCITATED NHBD HEART Ali, A., Xiang, B., Arora, R., White, P., Lee, T., Ashley, E., Large, S., Tian, G., Freed, D. WILEY-BLACKWELL. 2010: 7?7

  View details for Web of Science ID 000277330800032

• Upregulation of the apelin-APJ pathway promotes neointima formation in the carotid ligation model in mouse CARDIOVASCULAR RESEARCH Kojima, Y., Kundu, R. K., Cox, C. M., Leeper, N. J., Anderson, J. A., Chun, H. J., Ali, Z. A., Ashley, E. A., Krieg, P. A., Quertermous, T. 2010; 87 (1): 156-165

  Abstract

  To investigate apelin-APJ (angiotensin receptor-like 1) signalling in vascular remodelling, we have examined the pathophysiological response to carotid ligation in apelin knockout mice.Apelin null animals compared with wild-type mice had significantly decreased neointimal lesion area (1.17 +/- 0.17 vs. 3.33 +/- 1.04 x 10(4) microm(2), P < 0.05) and intima/media ratio (0.81 +/- 0.23 vs. 1.49 +/- 0.44, P < 0.05), averaged over four sites 0.5-2 mm from the ligation. Exogenous apelin infusion rescued the apelin-KO phenotype, promoting neointima formation in the null animals. Apelin null animals showed decreased smooth muscle positive area in the neointima (82.3 +/- 2.4 vs. 63.9 +/- 8.4, P < 0.05), and a smaller percentage BrdU positive cells in the neointima and media (11.06 +/- 1.00 vs. 6.53 +/- 0.86, P < 0.05). Apelin mRNA expression increased initially (5.2-fold, P < 0.01) followed by increased apelin receptor expression (10.1-fold, P < 0.05) in the ligated artery. Cytochemistry studies localized apelin expression to luminal endothelial cells and apelin receptor upregulation to smooth muscle cells (SMC) in the media and neointima. In vitro experiments with cultured rat aortic SMC revealed that apelin stimulation increased migration. In contrast to the increased expression of apelin and apelin receptor in carotid remodelling, expression was not upregulated in the apoE high fat model, and correlated with the known disease-inhibitory effect in this model.These data suggest that increased apelin receptor expression by SMC provides a paracrine pathway in injured vessels that allows endothelial-derived apelin to stimulate their division and migration into the neointima.

  View details for DOI 10.1093/cvr/cvq052

  View details for PubMedID 20176814

• Effect of Gender on Computerized Electrocardiogram Measurements in College Athletes PHYSICIAN AND SPORTSMEDICINE Mandic, S., Fonda, H., Dewey, F., Vy-van Le, Stein, R., Wheeler, M., Ashley, E. A., Myers, J., Froelicher, V. F. 2010; 38 (2): 156-164

  Abstract

  Background Broad criteria for classifying an electrocardiogram (ECG) as abnormal and requiring additional testing prior to participating in competitive athletics have been recommended for the preparticipation examination (PPE) of athletes. Because these criteria have not considered gender differences, we examined the effect of gender on the computerized ECG measurements obtained on Stanford student athletes. Currently available computer programs require a basis for "normal" in athletes of both genders to provide reliable interpretation. Methods During the 2007 PPE, computerized ECGs were recorded and analyzed on 658 athletes (54% male; mean age, 19 +/- 1 years) representing 22 sports. Electrocardiogram measurements included intervals and durations in all 12 leads to calculate 12-lead voltage sums, QRS amplitude and QRS area, spatial vector length (SVL), and the sum of the R wave in V5 and S wave in V2 (RSsum). Results By computer analysis, male athletes had significantly greater QRS duration, PR interval, Q-wave duration, J-point amplitude, and T-wave amplitude, and shorter QTc interval compared with female athletes (all P < 0.05). All ECG indicators of left ventricular electrical activity were significantly greater in males. Although gender was consistently associated with indices of atrial and ventricular electrical activity in multivariable analysis, ECG measurements correlated poorly with body dimensions. Conclusion Significant gender differences exist in ECG measurements of college athletes that are not explained by differences in body size. Our tables of "normal" computerized gender-specific measurements can facilitate the development of automated ECG interpretation for screening young athletes.

  View details for Web of Science ID 000290808000025

  View details for PubMedID 20631475

• Challenges in the clinical application of whole-genome sequencing LANCET Ormond, K. E., Wheeler, M. T., Hudgins, L., Klein, T. E., Butte, A. J., Altman, R. B., Ashley, E. A., Greely, H. T. 2010; 375 (9727): 1749-1751

  View details for DOI 10.1016/S0140-6736(10)60599-5

  View details for Web of Science ID 000277890200036

  View details for PubMedID 20434765

• Measurement Precision in the Optimization of Cardiac Resynchronization Therapy CIRCULATION-HEART FAILURE Turcott, R. G., Witteles, R. M., Wang, P. J., Vagelos, R. H., Fowler, M. B., Ashley, E. A. 2010; 3 (3): 395-404

  Abstract

  Cardiac resynchronization therapy improves morbidity and mortality in appropriately selected patients. Whether atrioventricular (AV) and interventricular (VV) pacing interval optimization confers further clinical improvement remains unclear. A variety of techniques are used to estimate optimum AV/VV intervals; however, the precision of their estimates and the ramifications of an imprecise estimate have not been characterized previously.An objective methodology for quantifying the precision of estimated optimum AV/VV intervals was developed, allowing physiologic effects to be distinguished from measurement variability. Optimization using multiple conventional techniques was conducted in individual sessions with 20 patients. Measures of stroke volume and dyssynchrony were obtained using impedance cardiography and echocardiographic methods, specifically, aortic velocity-time integral, mitral velocity-time integral, A-wave truncation, and septal-posterior wall motion delay. Echocardiographic methods yielded statistically insignificant data in the majority of patients (62%-82%). In contrast, impedance cardiography yielded statistically significant results in 84% and 75% of patients for AV and VV interval optimization, respectively. Individual cases demonstrated that accepting a plausible but statistically insignificant estimated optimum AV or VV interval can result in worse cardiac function than default values.Consideration of statistical significance is critical for validating clinical optimization data in individual patients and for comparing competing optimization techniques. Accepting an estimated optimum without knowledge of its precision can result in worse cardiac function than default settings and a misinterpretation of observed changes over time. In this study, only impedance cardiography yielded statistically significant AV and VV interval optimization data in the majority of patients.

  View details for DOI 10.1161/CIRCHEARTFAILURE.109.900076

  View details for PubMedID 20176716

• Aldehyde dehydrogenase activator attenuates diabetic cardiomyopathy; a role in improving the quality of resident cardiac stem cells? Palaniyandi, S., Disatnik, M., Sun, L., Vishnumangalam, J., Xia, X., Pavlovic, A., Bhalla, V., Ashley, E., Mochly-Rosen, D. FEDERATION AMER SOC EXP BIOL. 2010

  View details for Web of Science ID 000208675506726

• Defining the Limits of Athlete's Heart Implications for Screening in Diverse Populations CIRCULATION Sedehi, D., Ashley, E. A. 2010; 121 (9): 1066-1068

  View details for DOI 10.1161/CIR.0b013e3181d7308a

  View details for Web of Science ID 000275331600002

  View details for PubMedID 20176992

• Cost-Effectiveness of Preparticipation Screening for Prevention of Sudden Cardiac Death in Young Athletes ANNALS OF INTERNAL MEDICINE Wheeler, M. T., Heidenreich, P. A., Froelicher, V. F., Hlatky, M. A., Ashley, E. A. 2010; 152 (5): 276-W91

  Abstract

  Inclusion of 12-lead electrocardiography (ECG) in preparticipation screening of young athletes is controversial because of concerns about cost-effectiveness.To evaluate the cost-effectiveness of ECG plus cardiovascular-focused history and physical examination compared with cardiovascular-focused history and physical examination alone for preparticipation screening.Decision-analysis, cost-effectiveness model.Published epidemiologic and preparticipation screening data, vital statistics, and other publicly available data.Competitive athletes in high school and college aged 14 to 22 years.Lifetime.Societal.Nonparticipation in competitive athletic activity and disease-specific treatment for identified athletes with heart disease.Incremental health care cost per life-year gained.Addition of ECG to preparticipation screening saves 2.06 life-years per 1000 athletes at an incremental total cost of $89 per athlete and yields a cost-effectiveness ratio of $42 900 per life-year saved (95% CI, $21 200 to $71 300 per life-year saved) compared with cardiovascular-focused history and physical examination alone. Compared with no screening, ECG plus cardiovascular-focused history and physical examination saves 2.6 life-years per 1000 athletes screened and costs $199 per athlete, yielding a cost-effectiveness ratio of $76 100 per life-year saved ($62 400 to $130 000).Results are sensitive to the relative risk reduction associated with nonparticipation and the cost of initial screening.Effectiveness data are derived from 1 major European study. Patterns of causes of sudden death may vary among countries.Screening young athletes with 12-lead ECG plus cardiovascular-focused history and physical examination may be cost-effective.Stanford Cardiovascular Institute and the Breetwor Foundation.

  View details for PubMedID 20194233

• Addition of the Electrocardiogram to the Preparticipation Examination of College Athletes CLINICAL JOURNAL OF SPORT MEDICINE Le, V., Wheeler, M. T., Mandic, S., Dewey, F., Fonda, H., Perez, M., Sungar, G., Garza, D., Ashley, E. A., Matheson, G., Froelicher, V. 2010; 20 (2): 98-105

  Abstract

  Although the use of standardized cardiovascular (CV) system-focused history and physical examination is recommended for the preparticipation examination (PPE) of athletes, the addition of the electrocardiogram (ECG) has been controversial. Because the impact of ECG screening on college athletes has rarely been reported, we analyzed the findings of adding the ECG to the PPE of Stanford athletes.For the past 15 years, the Stanford Sports Medicine program has mandated a PPE questionnaire and physical examination by Stanford physicians for participation in intercollegiate athletics. In 2007, computerized ECGs with digital measurements were recorded on athletes and entered into a database.Although the use of standardized CV-focused history and physical examination are recommended for the PPE of athletes, the addition of the ECG has been controversial. Because the feasibility and outcomes of ECG screening on college athletes have rarely been reported, we present findings derived from the addition of the ECG to the PPE of Stanford athletes. For the past 15 years, the Stanford Sports Medicine program has mandated a PPE questionnaire and physical examination by Stanford physicians for participation in intercollegiate athletics. In 2007, computerized ECGs with digital measurements were recorded on athletes and entered into a database.Six hundred fifty-eight recordings were obtained (54% men, 10% African-American, mean age 20 years) representing 24 sports. Although 68% of the women had normal ECGs, only 38% of the men did so. Incomplete right bundle branch block (RBBB) (13%), right axis deviation (RAD) (10%), and atrial abnormalities (3%) were the 3 most common minor abnormalities. Sokolow-Lyon criteria for left ventricular hypertrophy (LVH) were found in 49%; however, only 27% had a Romhilt-Estes score of >or=4. T-wave inversion in V2 to V3 occurred in 7%, and only 5 men had abnormal Q-waves. Sixty-three athletes (10%) were judged to have distinctly abnormal ECG findings possibly associated with conditions including hypertrophic cardiomyopathy or arrhythmogenic right ventricular dysplasia/cardiomyopathy. These athletes were offered further testing but this was not mandated according to the research protocol.Six hundred fifty-three recordings were obtained (54% men, 7% African American, mean age 20 years), representing 24 sports. Although 68% of the women had normal ECGs, only 38% of the men did so. Incomplete RBBB (13%), RAD (10%), and atrial abnormalities (3%) were the 3 most common minor abnormalities. Sokolow-Lyon criteria for LVH were found in 49%; however, only 27% had a Romhilt-Estes score of >or=4. T-wave inversion in V2 to V3 occurred in 7% and only 5 men had abnormal Q-waves. Sixty-five athletes (10%) were judged to have distinctly abnormal ECG findings suggestive of arrhythmogenic right ventricular dysplasia, hypertrophic cardiomyopathy, and/or biventricular hypertrophy. These athletes will be submitted to further testing.Mass ECG screening is achievable within the collegiate setting by using volunteers when the appropriate equipment is available. However, the rate of secondary testing suggests the need for an evaluation of cost-effectiveness for mass screening and the development of new athlete-specific ECG interpretation algorithms.

  View details for DOI 10.1097/JSM.0b013e3181d44705

  View details for PubMedID 20215891

• New insights for the diagnosis and management of right ventricular failure, from molecular imaging to targeted right ventricular therapy CURRENT OPINION IN CARDIOLOGY Haddad, F., Ashley, E., Michelakis, E. D. 2010; 25 (2): 131-140

  Abstract

  Despite the recognition of a critical role of the right ventricle (RV) in many aspects of cardiovascular medicine, there has been surprisingly little interest in right ventricular-targeted imaging and therapeutic approaches. Compared with the left ventricle, the RV has a different embryologic origin, undergoes a dramatic change during the transition from the fetal to the adult circulation and normally operates in a low resistance or impedance arterial system. Here, we review new insights on the pathophysiology, assessment and management of right ventricular failure.Our understanding of the mechanisms underlying right ventricular failure has improved. As in the left ventricle, decrease in alpha-myosin heavy chain and a switch towards glycolysis from fatty acid oxidation is observed in the stressed RV, but the key question remains unanswered: why is the RV so much more vulnerable to failure upon afterload increase compared with the left ventricle? In assessing the RV, it is becoming increasingly important to consider the RV and pulmonary artery as a unit. New therapies that could specifically target the RV, such as metabolic modulators and phosphodiesterase type 5 inhibitors, are now being considered.A better understanding of the molecular mechanisms of right ventricular failure will lead to the development of new strategies for the diagnosis and management of right ventricular failure. Right ventricular-targeted therapies are needed in a number of diseases in which only the RV fails.

  View details for DOI 10.1097/HCO.0b013e328335febd

  View details for Web of Science ID 000274797100010

  View details for PubMedID 20130456

• Cardiac Resuscitation Following Circulatory Arrest in the Organ Donor Is Associated with Excellent Functional and Metabolic Recovery: Implications for Clinical Heart Transplantation 30th Annual Meeting and Scientific Sessions of the International-Society-for-Heart-and-Lung-Transplantation Ali, A. A., Xiang, B., White, P., Tsui, S., Ashley, E., Large, S. R., LEE, T. W., Arora, R., Tian, G., Freed, D. H. ELSEVIER SCIENCE INC. 2010: S118?S118

  View details for Web of Science ID 000274756100351

• Bone Morphogenetic Protein Promotes Motility And Represses Proliferation Of Vascular Smooth Muscle Cells By Tandem Recruitment Of Canonical And Non-canonical Wnt Signaling Pathways Perez, v., Ali, Z., Alastalo, T., Sawada, H., Axelrod, J., Ashley, E., Rabinovitch, M. AMER THORACIC SOC. 2010

  View details for Web of Science ID 000208771000180

• A New Era in Clinical Genetic Testing for Hypertrophic Cardiomyopathy JOURNAL OF CARDIOVASCULAR TRANSLATIONAL RESEARCH Wheeler, M., Pavlovic, A., deGoma, E., Salisbury, H., Brown, C., Ashley, E. A. 2009; 2 (4): 381-391

  Abstract

  Building on seminal studies of the last 20 years, genetic testing for hypertrophic cardiomyopathy (HCM) has become a clinical reality in the form of targeted exonic sequencing of known disease-causing genes. This has been driven primarily by the decreasing cost of sequencing, but the high profile of genome-wide association studies, the launch of direct-to-consumer genetic testing, and new legislative protection have also played important roles. In the clinical management of hypertrophic cardiomyopathy, genetic testing is primarily used for family screening. An increasing role is recognized, however, in diagnostic settings: in the differential diagnosis of HCM; in the differentiation of HCM from hypertensive or athlete's heart; and more rarely in preimplantation genetic diagnosis. Aside from diagnostic clarification and family screening, use of the genetic test for guiding therapy remains controversial, with data currently too limited to derive a reliable mutation risk prediction from within the phenotypic noise of different modifying genomes. Meanwhile, the power of genetic testing derives from the confidence with which a mutation can be called present or absent in a given individual. This confidence contrasts with our more limited ability to judge the significance of mutations for which co-segregation has not been demonstrated. These variants of "unknown" significance represent the greatest challenge to the wider adoption of genetic testing in HCM. Looking forward, next-generation sequencing technologies promise to revolutionize the current approach as whole genome sequencing will soon be available for the cost of today's targeted panel. In summary, our future will be characterized not by lack of genetic information but by our ability to effectively parse it.

  View details for DOI 10.1007/s12265-009-9139-0

  View details for Web of Science ID 000284691000005

  View details for PubMedID 20559996

• Adding an Electrocardiogram to the Pre-participation Examination in Competitive Athletes: A Systematic Review CURRENT PROBLEMS IN CARDIOLOGY Perez, M., Fonda, H., Le, V., Mitiku, T., Ray, J., Freeman, J. V., Ashley, E., Froelicher, V. F. 2009; 34 (12): 586-662

  Abstract

  No matter how rare, the death of young athletes is a tragedy. Can it be prevented? The European experience suggests that adding the electrocardiogram (ECG) to the standard medical and family history and physical examination can decrease cardiac deaths by 90%. However, there has not been a randomized trial to demonstrate such a reduction. While there are obvious differences between the European and American experiences with athletes including very differing causes of athletic deaths, some would highlight the European emphasis on public welfare vs the protection of personal rights in the USA. Even the authors of this systematic review have differing interpretation of the data: some of us view screening as a hopeless battle against Bayes, while others feel that the ECG can save lives. What we all agree on is that the USA should implement the American Heart Association 12-point screening recommendations and that, before ECG screening is mandated, we need to gather more data and optimize ECG criteria for screening young athletes.

  View details for DOI 10.1016/j.cpcardiol.2009.08.002

  View details for Web of Science ID 000271915700002

  View details for PubMedID 19887232

• Insights into Human beta-Cardiac Myosin Function from Single Molecule and Single Cell Studies JOURNAL OF CARDIOVASCULAR TRANSLATIONAL RESEARCH Sivaramakrishnan, S., Ashley, E., Leinwand, L., Spudich, J. A. 2009; 2 (4): 426-440

  Abstract

  beta-Cardiac myosin is a mechanoenzyme that converts the energy from ATP hydrolysis into a mechanical force that drives contractility in muscle. Thirty percent of the point mutations that result in hypertrophic cardiomyopathy are localized to MYH7, the gene encoding human beta-cardiac myosin heavy chain (beta-MyHC). Force generation by myosins requires a tight and highly conserved allosteric coupling between its different protein domains. Hence, the effects of single point mutations on the force generation and kinetics of beta-cardiac myosin molecules cannot be predicted directly from their location within the protein structure. Great insight would be gained from understanding the link between the functional defect in the myosin protein and the clinical phenotypes of patients expressing them. Over the last decade, several single molecule techniques have been developed to understand in detail the chemomechanical cycle of different myosins. In this review, we highlight the single molecule techniques that can be used to assess the effect of point mutations on beta-cardiac myosin function. Recent bioengineering advances have enabled the micromanipulation of single cardiomyocyte cells to characterize their force-length dynamics. Here, we briefly review single cell micromanipulation as an approach to determine the effect of beta-MyHC mutations on cardiomyocyte function. Finally, we examine the technical challenges specific to studying beta-cardiac myosin function both using single molecule and single cell approaches.

  View details for DOI 10.1007/s12265-009-9129-2

  View details for Web of Science ID 000284691000010

  View details for PubMedID 20560001

• Insights From Network Analysis: Deficiency of Glutathione Peroxidase-1 Increases In-stent Stenosis 82nd National Conference and Exhibitions and Scientific Sessions of the American-Heart-Association Ali, Z., Raiesdana, A., Qu, X., Ali, A., Pavlovic, A., Wheeler, M., Channon, K., Quertermous, T., Ashley, E. LIPPINCOTT WILLIAMS & WILKINS. 2009: S1139?S1140

  View details for Web of Science ID 000271831504200

• Arterial Stent Deployment Results in a Time Dependent Increase in Neointima Formation and Delayed Endothelial Cell Repopulation Compared With Balloon Angioplasty Douglas, G., Van Kampen, E., Ali, Z., Qu, X., Ashley, E., Channon, K. M. LIPPINCOTT WILLIAMS & WILKINS. 2009: S1171

  View details for Web of Science ID 000271831504340

• Outcomes of Septal Myectomy and Alcohol Septal Ablation for Obstructive Hypertrophic Cardiomyopathy: The Stanford Experience 82nd National Conference and Exhibitions and Scientific Sessions of the American-Heart-Association Tibayan, Y., Sedehi, D., Chi, J., Pavlovic, A., Salisbury, H., Wheeler, M., Ho, M. Y., Sgroi, M., Kim, Y., Tibayan, F. A., Reitz, B. A., Robbins, R. C., Lee, D. P., Ashley, E. A. LIPPINCOTT WILLIAMS & WILKINS. 2009: S864?S864

  View details for Web of Science ID 000271831502680

• Endogenous regulation of cardiovascular function by apelin-APJ AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY Charo, D. N., Ho, M., Fajardo, G., Kawana, M., Kundu, R. K., Sheikh, A. Y., Finsterbach, T. P., Leeper, N. J., Ernst, K. V., Chen, M. M., Ho, Y. D., Chun, H. J., Bernstein, D., Ashley, E. A., Quertermous, T. 2009; 297 (5): H1904-H1913

  Abstract

  Studies have shown significant cardiovascular effects of exogenous apelin administration, including the potent activation of cardiac contraction. However, the role of the endogenous apelin-APJ pathway is less clear. To study the loss of endogenous apelin-APJ signaling, we generated mice lacking either the ligand (apelin) or the receptor (APJ). Apelin-deficient mice were viable, fertile, and showed normal development. In contrast, APJ-deficient mice were not born in the expected Mendelian ratio, and many showed cardiovascular developmental defects. Under basal conditions, both apelin and APJ null mice that survived to adulthood manifested modest decrements in contractile function. However, with exercise stress both mutant lines demonstrated consistent and striking decreases in exercise capacity. To explain these findings, we explored the role of autocrine signaling in vitro using field stimulation of isolated left ventricular cardiomyocytes lacking either apelin or APJ. Both groups manifested less sarcomeric shortening and impaired velocity of contraction and relaxation with no difference in calcium transient. Taken together, these results demonstrate that endogenous apelin-APJ signaling plays a modest role in maintaining basal cardiac function in adult mice with a more substantive role during conditions of stress. In addition, an autocrine pathway seems to exist in myocardial cells, the ablation of which reduces cellular contraction without change in calcium transient. Finally, differences in the developmental phenotype between apelin and APJ null mice suggest the possibility of undiscovered APJ ligands or ligand-independent effects of APJ.

  View details for DOI 10.1152/ajpheart.00686.2009

  View details for Web of Science ID 000271143400045

  View details for PubMedID 19767528

  View details for PubMedCentralID PMC2781363

• The Medical Device Safety Act of 2009: Clarifying Preemption AMERICAN JOURNAL OF THERAPEUTICS Turcott, R. G., Ashley, E. A. 2009; 16 (6): 471-474

  View details for Web of Science ID 000272535900002

  View details for PubMedID 19940607

• Electrocardiographic predictors of atrial fibrillation AMERICAN HEART JOURNAL Perez, M. V., Dewey, F. E., Marcus, R., Ashley, E. A., Al-Ahmad, A. A., Wang, P. J., Froelicher, V. F. 2009; 158 (4): 622-628

  Abstract

  Atrial fibrillation (AF) is the most prevalent arrhythmia in the United States and accounts for more than 750,000 strokes per year. Noninvasive predictors of AF may help identify patients at risk of developing AF. Our objective was to identify the electrocardiographic characteristics associated with onset of AF.This was a retrospective cohort analysis of 42,751 patients with electrocardiograms (ECGs) ordered by physician's discretion and analyzed using a computerized system. The population was followed for detection of AF on subsequent ECGs. Cox proportional hazard regression analysis was performed to test the association between these ECG characteristics and development of AF.For a mean follow-up of 5.3 years, 1,050 (2.4%) patients were found to have AF on subsequent ECG recordings. Several ECG characteristics, such as P-wave dispersion (the difference between the widest and narrowest P waves), premature atrial contractions, and an abnormal P axis, were predictive of AF with hazard ratio of approximately 2 after correcting for age and sex. P-wave index, the SD of P-wave duration across all leads, was one of the strongest predictors of AF with a concordance index of 0.62 and a hazard ratio of 2.7 (95% CI 2.1-3.3) for a P-wave index >35. These were among the several independently predictive markers identified on multivariate analysis.Several ECG markers are independently predictive of future onset of AF. The P index, a measurement of disorganized atrial depolarization, is one of the strongest predictors of AF. The ECG contains valuable prognostic information that can identify patients at risk of AF.

  View details for DOI 10.1016/j.ahj.2009.08.002

  View details for PubMedID 19781423

• Re: A prospective randomized evaluation of VV delay optimization in CRT-D recipients: echocardiographic observations from the RHYTHM II ICD study. Pacing and clinical electrophysiology : PACE Turcott, R. G., Das, A. K., Ashley, E. A. 2009; 32 (10): 1360-1361

  View details for DOI 10.1111/j.1540-8159.2009.02501.x

  View details for PubMedID 19732365

• Mechanisms of exercise intolerance in patients with hypertrophic cardiomyopathy AMERICAN HEART JOURNAL Le, V., Perez, M. V., Wheeler, M. T., Myers, J., Schnittger, I., Ashley, E. A. 2009; 158 (3): E27-E34

  Abstract

  To determine the relation between echocardiogram findings and exercise capacity in hypertrophic cardiomyopathy (HCM).Sixty-three patients (48 +/- 15 years) were referred for cardiopulmonary testing and exercise echocardiography. They were classified by morphology: proximal (n = 11), reverse curvature (n = 32), apical (n = 7), and concentric HCM (n = 13). There were more women in proximal and reverse curvature groups. Proximal HCM patients were older. Maximal left ventricular thickness was highest in reverse curvature group. At peak exercise, concentric HCM achieved the lowest percent predicted maximal Vo2. Excluding apical group, no significant differences in gradient were noted between groups. Overall, no statistically significant correlation was found between peak Vo2, wall thickness, and gradient. Significant correlations were noted between peak Vo2 and indexed left atrial (LA) volume (r = -0.52), lateral E' (r = 0.50), and lateral E/E' ratio (r = -0.46). A multivariate model including age, lateral E', indexed LA volume, and mitral A wave explained 46% of the variance in peak Vo2 (P = .01).Lateral E' and indexed LA volume are negatively correlated with functional capacity. Although patients with concentric morphology achieved the lowest peak Vo2, wall thickness and gradient did not predict exercise capacity.

  View details for DOI 10.1016/j.ahj.2009.06.006

  View details for Web of Science ID 000269641200027

  View details for PubMedID 19699847

• The ageing athlete: screening prior to vigorous exertion in asymptomatic adults without known cardiovascular disease BRITISH JOURNAL OF SPORTS MEDICINE Freeman, J., Froelicher, V., Ashley, E. 2009; 43 (9): 696-701

  Abstract

  The exercise electrocardiogram (ECG) is widely considered the best available test for screening asymptomatic adults without known cardiovascular (CV) disease prior to initiating a vigorous exercise programme due to its prognostic value, widespread availability and low cost. Observational studies have demonstrated an increased relative risk of CV events with positive screening exercise ECG tests in men with diabetes, advanced age, or multiple cardiac risk factors. Recent observational studies have not demonstrated similar prognostic value for exercise ECG testing in asymptomatic healthy women. Despite the predictive ability of exercise ECG testing in several groups, there have been no studies demonstrating a significant impact of screening on morbidity and mortality in completely asymptomatic patients, leading to significant discordance in consensus guidelines on screening. One prospective observational study is ongoing in Italy that may for the first time demonstrate the ability to decrease incident CV events using preparticipation screening exercise ECG testing in adult athletes with targeted exclusion from athletics. Until more conclusive data is available the authors currently recommend screening exercise ECG testing in asymptomatic men with diabetes and asymptomatic men over age 45 with two or more CV risk factors prior to initiating a vigorous exercise programme. Consideration should also be given to screening asymptomatic patients younger than 45 with particularly strong risk factor exposure or elderly patients with fewer than two risk factors.

  View details for DOI 10.1136/bjsm.2008.054783

  View details for PubMedID 19734505

• THE RESUSCITATED DECEASED DONOR HEART IS FUNCTIONALLY SUPERIOR TO THE BRAINSTEM DEAD DONOR HEART Ali, A. A., Fajardo, G., Tsuda, S., Budas, G., Ali, Z., Quertermous, T., Bernstein, D., Tsui, S., Robbins, R., Fischbein, M., Large, S., Ashley, E. WILEY-BLACKWELL PUBLISHING, INC. 2009: 138

  View details for Web of Science ID 000269392800514

• Apelin prevents aortic aneurysm formation by inhibiting macrophage inflammation AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY Leeper, N. J., Tedesco, M. M., Kojima, Y., Schultz, G. M., Kundu, R. K., Ashley, E. A., Tsao, P. S., Dalman, R. L., Quertermous, T. 2009; 296 (5): H1329-H1335

  Abstract

  Apelin is a potent inodilator with recently described antiatherogenic properties. We hypothesized that apelin might also attenuate abdominal aortic aneurysm (AAA) formation by limiting disease-related vascular wall inflammation. C57BL/6 mice implanted with osmotic pumps filled with apelin or saline were treated with pancreatic elastase to create infrarenal AAAs. Mice were euthanized for aortic PCR analysis or followed ultrasonographically and then euthanized for histological analysis. The cellular expression of inflammatory cytokines and chemokines in response to apelin was also assessed in cultured macrophages, smooth muscle cells, and fibroblasts. Apelin treatment resulted in diminished AAA formation, with a 47% reduction in maximal cross-sectional area (0.74 vs. 1.39 mm(2), P < 0.03) and a 57% reduction in macrophage infiltrate (113 vs. 261.3 cells/high-power field, P < 0.0001) relative to the saline-treated group. Apelin infusion was also associated with significantly reduced aortic macrophage colony-stimulating factor expression and decreased monocyte chemattractant protein (MCP)-1, macrophage inflammatory protein (MIP)-1alpha, interleukin (IL)-6, and tumor necrosis factor (TNF)-alpha mean mRNA levels. Apelin stimulation of cultured macrophages significantly reduced MCP-1 and TNF-alpha mRNA levels relative to baseline (2.03- and 1.89-fold reduction, P < 0.03, respectively) but did not affect intimal adhesion molecule expression or medial or adventitial cell cytokine production. Apelin significantly reduces aneurysm formation in the elastase model of human AAA disease. The mechanism appears to be decreased macrophage burden, perhaps related to an apelin-mediated decrease in proinflammatory cytokine and chemokine activation.

  View details for DOI 10.1152/ajpheart.01341.2008

  View details for Web of Science ID 000265659100020

  View details for PubMedID 19304942

  View details for PubMedCentralID PMC2685356

• Should the exercise ECG be used to screen for sudden cardiac death? EUROPEAN HEART JOURNAL Freeman, J., Ashley, E. A., Froelicher, V. 2009; 30 (5): 528-529

  View details for DOI 10.1093/eurheartj/ehp029

  View details for Web of Science ID 000263951000006

  View details for PubMedID 19201762

• Statin Use and Ventricular Arrhythmias During Clinical Treadmill Testing JOURNAL OF CARDIOVASCULAR ELECTROPHYSIOLOGY Dewey, F. E., Perez, M., Hadley, D., Freeman, J. V., Wang, P., Ashley, E. A., Myers, J., Froelicher, V. F. 2009; 20 (2): 193-199

  Abstract

  Premature ventricular complexes (PVCs) during exercise are associated with adverse prognosis, particularly in patients with intermediate treadmill test findings. Statin use reduces the incidence of resting ventricular arrhythmias in patients with coronary artery disease; however, the relationship between statin use and exercise-induced ventricular arrhythmias has not been investigated.We evaluated the association between statin use and PVCs in 1,847 heart-failure-free patients (mean age 58, 95% male) undergoing clinical exercise treadmill testing between 1997 and 2004 in the VA Palo Alto Health Care System. PVCs were quantified in beats per minute and frequent PVCs were defined as PVC rates greater than the median value (0.43 and 0.60 PVCs per minute for exercise and recovery, respectively). Propensity-adjusted logistic regression was used to evaluate the odds of developing PVCs during exercise and recovery periods associated with statin use. There were 431 subjects who developed frequent PVCs during exercise and 284 subjects had frequent recovery PVCs. After propensity score adjustment, subjects treated with statins (n = 145) had 42% lower odds of developing frequent PVCs during exercise (odds ratio [OR] 0.58, 95% confidence interval [CI] 0.37-0.93) and 44% lower odds of developing frequent PVCs during recovery (OR 0.56, 95% CI 0.30-0.94). These effects were not modified by age, prior coronary disease, hypercholesterolemia, exercise-induced angina, or exercise capacity.Statin use was associated with reduced odds of frequent PVCs during and after clinical exercise testing in a manner independent of associations with coronary disease or ischemia in our study population.

  View details for DOI 10.1111/j.1540-8167.2008.01284.x

  View details for PubMedID 18775041

• A general framework for dose optimization. AMIA ... Annual Symposium proceedings / AMIA Symposium. AMIA Symposium Turcott, R. G., Sagreiya, H., Ashley, E. A., Altman, R. B., Das, A. K. 2009; 2009: 656-660

  Abstract

  Dose optimization is a ubiquitous challenge in clinical practice and includes both pharmacologic and non-pharmacologic interventions. Methods for the statistical assessment of optimum dosing are lacking. We developed a generic framework for dose titration and demonstrated its application in two domains. Optimum warfarin dose was estimated from clinical titration data. In addition, cardiac pacemaker interval optimization was conducted using three conventional techniques. For both data types, optima were obtained from mathematical functions fit to the raw data. The precision of the estimated optima was quantified using bootstrapping. In pacing optimization, the observed precision varied significantly among the techniques, suggesting that impedance cardiography is superior to commonly used echocardiographic methods. The average 95% confidence interval of the estimated optimum warfarin dose was +/-18%, suggesting that titration within this range is of limited utility. By identifying statistically ineffective interventions, objective analysis of optimization data may both improve outcomes and reduce healthcare costs.

  View details for PubMedID 20351936

• Age and Double Product (Systolic Blood Pressure x Heart Rate) Reserve-Adjusted Modification of the Duke Treadmill Score Nomogram in Men AMERICAN JOURNAL OF CARDIOLOGY Rafie, A. H., Dewey, F. E., Sungar, G. W., Ashley, E. A., Hadley, D., Myers, J., Froelicher, V. F. 2008; 102 (10): 1407-1412

  Abstract

  The Duke Treadmill Score (DTS) is an established clinical tool for risk stratification. Our aim was to determine if other variables could improve the prognostic power of the DTS and if so, to modify the DTS nomogram. From a total of 1,959 patients referred for exercise testing at the Palo Alto VA Medical Center from 1997 to 2006 (a mean follow-up of 5.4 years), we studied 1,759 male veterans (age 57 +/- 12 years) free of heart failure. Double product (DP) was calculated by multiplying systolic blood pressure and heart rate; variables and their products were subtracted to obtain the differences between at rest and maximal exercise (reserve) and recovery. Of all the hemodynamic measurements, DP reserve was the strongest predictor of cardiovascular death (CVD) (Wald Z-score -3.84, p <0.001) after adjustment for potential confounders. When the components of DTS were entered in the Cox hazard model with DP reserve and age, only DP reserve and age were chosen (p <0.00001). Using the Cox coefficients, a score calculated by [age - DTS - 3 x (DP reserve/1,000)] yielded an area under the curve of 0.84 compared with 0.76 for the DTS. Using this equation, a nomogram was constructed by adding age and DP reserve to the original DTS nomogram improving estimation of annual CVD. In conclusion, we propose an age and DP reserve-adjusted DTS nomogram that improves the prognostic estimates of average annual CVD over the DTS alone.

  View details for DOI 10.1016/j.amjcard.2008.07.020

  View details for PubMedID 18993164

• Addition of the Electrocardiogram to the Pre-participation Examination of College Athletes 81st Annual Scientific Session of the American-Heart-Association Le, V., Dewey, F., Perez, M., Wheeler, M., Mandic, S., Sungar, G., Ashley, E., Matheson, G., Froelicher, V. LIPPINCOTT WILLIAMS & WILKINS. 2008: S835?S835

  View details for Web of Science ID 000262104503057

• Age and Double Product Reserve-Adjusted Modification of the Duke Treadmill Score Nomogram Rafie, A., Dewey, F. E., Sungar, G. W., Ashley, E. A., Hadley, D., Myers, J., Froelicher, V. F. LIPPINCOTT WILLIAMS & WILKINS. 2008: S681

  View details for Web of Science ID 000262104502193

• Cost-Effectiveness Analysis Demonstrates Superiority of Screening Young Athletes with 12-Lead Electrocardiogram versus History and Physical in Preventing Sudden Cardiac Death Wheeler, M. T., Heidenreich, P. A., Froelicher, V. F., Hlatky, M. A., Ashley, E. A. LIPPINCOTT WILLIAMS & WILKINS. 2008: S1163

  View details for Web of Science ID 000262104504616

• Left Atrial Volume and E/E' Ratio are Most Predictive of Exercise Capacity in Hypertrophic Cardiomyopathy 81st Annual Scientific Session of the American-Heart-Association Le, V., Perez, M., Wheeler, M., Schnittger, I., Ashley, E. LIPPINCOTT WILLIAMS & WILKINS. 2008: S641?S641

  View details for Web of Science ID 000262104502032

• Apelin signaling antagonizes Ang II effects in mouse models of atherosclerosis JOURNAL OF CLINICAL INVESTIGATION Chun, H. J., Ali, Z. A., Kojima, Y., Kundu, R. K., Sheikh, A. Y., Agrawal, R., Zheng, L., Leeper, N. J., Pearl, N. E., Patterson, A. J., Anderson, J. P., Tsao, P. S., Lenardo, M. J., Ashley, E. A., Quertermous, T. 2008; 118 (10): 3343-3354

  Abstract

  Apelin and its cognate G protein-coupled receptor APJ constitute a signaling pathway with a positive inotropic effect on cardiac function and a vasodepressor function in the systemic circulation. The apelin-APJ pathway appears to have opposing physiological roles to the renin-angiotensin system. Here we investigated whether the apelin-APJ pathway can directly antagonize vascular disease-related Ang II actions. In ApoE-KO mice, exogenous Ang II induced atherosclerosis and abdominal aortic aneurysm formation; we found that coinfusion of apelin abrogated these effects. Similarly, apelin treatment rescued Ang II-mediated increases in neointimal formation and vascular remodeling in a vein graft model. NO has previously been implicated in the vasodepressor function of apelin; we found that apelin treatment increased NO bioavailability in ApoE-KO mice. Furthermore, infusion of an NO synthase inhibitor blocked the apelin-mediated decrease in atherosclerosis and aneurysm formation. In rat primary aortic smooth muscle cells, apelin inhibited Ang II-mediated transcriptional regulation of multiple targets as measured by reporter assays. In addition, we demonstrated by coimmunoprecipitation and fluorescence resonance energy transfer analysis that the Ang II and apelin receptors interacted physically. Taken together, these findings indicate that apelin signaling can block Ang II actions in vascular disease by increasing NO production and inhibiting Ang II cellular signaling.

  View details for DOI 10.1172/JCI34871

  View details for PubMedID 18769630

• Progressive dyspnea after CABG: Complication of retained epicardial pacing wires ANNALS OF THORACIC SURGERY Horng, G. S., Ashley, E., Balsam, L., Reitz, B., Zamanian, R. T. 2008; 86 (4): 1352-1354

  Abstract

  We report a case of progressive dyspnea and recurrent pneumonia after uneventful coronary artery bypass graft surgery caused by migration of retained epicardial pacing wires into the right upper lobe of the lung. Removal of the wires by open thoracotomy resulted in significant improvement in dyspnea and near complete resolution of the bronchiectasis and consolidation.

  View details for DOI 10.1016/j.athoracsur.2008.03.013

  View details for PubMedID 18805194

• Low-dose growth hormone is cardioprotective in uremia JOURNAL OF THE AMERICAN SOCIETY OF NEPHROLOGY Rabkin, R., Awwad, I., Chen, Y., Ashley, E. A., Sun, D., Sood, S., Clusin, W., Heidenreich, P., Piecha, G., Gross, M. 2008; 19 (9): 1774-1783

  Abstract

  Growth hormone (GH) is required to maintain normal cardiac structure and function and has a positive effect on cardiac remodeling in experimental and possibly human disease. Cardiac resistance to GH develops in the uremic state, perhaps predisposing to the characteristic cardiomyopathy associated with uremia. It was hypothesized that administration of low-dosage GH may have a salutary effect on the cardiac remodeling process in uremia, but because high levels of GH have adverse cardiac effects, administration of high-dosage GH may worsen uremic cardiomyopathy. In rats with chronic renal failure, quantitative cardiac morphology revealed a decrease in total capillary length and capillary length density and an increase in mean intercapillary distance and fibroblast volume density evident. Low-dosage GH prevented these changes. Collagen and TGF-beta immunostaining, increased in chronic renal failure, were also reduced by GH, suggesting a mechanism for its salutary action. Low-dosage GH also prevented thickening of the carotid artery but did not affect aortic pathology. In contrast, high-dosage GH worsened several of these variables. These results suggest that low-dosage GH may benefit the heart and possibly the carotid arteries in chronic renal failure.

  View details for DOI 10.1681/ASN.2007121386

  View details for Web of Science ID 000259167000021

  View details for PubMedID 18650479

  View details for PubMedCentralID PMC2518445

• Evaluation of Polymorphisms in Candidate Genes in the Dramatic Response to Pharmacologic Therapy of Heart Failure Basic Cardiovascular Sciences Conference Wheeler, M. T., Pavlovic, A., Dewey, F., Perez, M., Absher, D., Ho, M. Y., Cretti, E., Southwick, A., Rosenthal, D. N., Bernstein, D., Myers, R. M., Heidenreich, P. A., Fowler, M. B., Robbins, R. C., Ashley, E. A. LIPPINCOTT WILLIAMS & WILKINS. 2008: E64?E65

  View details for Web of Science ID 000258845200165

• Reevaluating Dogma: Recapitulation of Fetal Gene Expression Programs in Heart Failure Basic Cardiovascular Sciences Conference Dewey, F. E., Perez, M. V., Wheeler, M. T., Ashley, E. A. LIPPINCOTT WILLIAMS & WILKINS. 2008: E64?E64

  View details for Web of Science ID 000258845200163

• Overrepresentation of neuronal development pathways in heart failure patients who dramatically responded to pharmaceutical therapy 12th Annual Scientific Meeting of the Heart-Failure-Society-of-America Pavlovic, A., Perez, M., Absher, D., Wheeler, M., Ho, M., Dewey, R., Cretti, L., Southwick, A., Rosenthal, D., Bernstein, D., Myers, R. M., Heidenreich, P., Fowler, M. B., Robbins, R., Ashley, E. CHURCHILL LIVINGSTONE INC MEDICAL PUBLISHERS. 2008: S41?S41

  View details for Web of Science ID 000258565100129

• Impedance cardiography is superior to echocardiographic methods for pacing interval optimization Turcott, R. G., Witteles, R. M., Wang, P. J., Vagelos, R. H., Fowler, M. B., Ashley, E. A. CHURCHILL LIVINGSTONE INC MEDICAL PUBLISHERS. 2008: S65

  View details for Web of Science ID 000258565100208

• Statistical methods for AV/VV optimization Turcott, R. G., Ashley, E. A. CHURCHILL LIVINGSTONE INC MEDICAL PUBLISHERS. 2008: S65

  View details for Web of Science ID 000258565100209

• Genetics of Arrhythmia: Disease Pathways Beyond Ion Channels JOURNAL OF CARDIOVASCULAR TRANSLATIONAL RESEARCH Perez, M. V., Wheeler, M., Ho, M., Pavlovic, A., Wang, P., Ashley, E. A. 2008; 1 (2): 155-165

  Abstract

  Diseases of the electrical conduction system that lead to irregularities in cardiac rhythm can have morbid and often lethal clinical outcomes. Linkage analysis has been the principal tool used to discover the genetic mutations responsible for Mendelian arrhythmic disease. Although the majority of arrhythmias can be accounted for by mutations in genes encoding ion channels, linkage analysis has also uncovered the role of other gene families such as those encoding members of the desmosome. With a list of candidates in mind, mutational analysis has helped confirm the suspicion that proteins found in caveolae or gap junctions also play a role in arrhythmogenesis. Atrial fibrillation and sudden cardiac death are relatively common arrhythmias that may be caused by multiple factors including common genetic variants. Genome-wide association studies are already revealing the important and poorly understood role of intergenic regions in atrial fibrillation. Despite the great advancements that have been made in our understanding of the genetics of these diseases, we are still far from able to routinely use genomic data to make clinical management decisions. There remain several hurdles in the study of genetics of arrhythmia, including the costs of genotyping, the need to find large affected families for linkage analysis, or to recruit large numbers of patients for genome-wide studies. Novel techniques that incorporate epigenetic information, such as known gene-gene interactions, biologic pathways, and experimental gene expression, will need to be developed to better interpret the large amount of genetic data that can now be generated. The study of arrhythmia genetics will continue to elucidate the pathophysiology of disease, help identify novel therapies, and ultimately allow us to deliver the individualized medical therapy that has long been anticipated.

  View details for DOI 10.1007/s12265-008-9030-4

  View details for Web of Science ID 000207734800012

  View details for PubMedID 20559910

• Does size matter? Clinical applications of scaling cardiac size and function for body size CIRCULATION Dewey, F. E., Rosenthal, D., Murphy, D. J., Froelicher, V. F., Ashley, E. A. 2008; 117 (17): 2279-2287

  Abstract

  Extensive evidence is available that cardiovascular structure and function, along with other biological properties that span the range of organism size and speciation, scale with body size. Although appreciation of such factors is commonplace in pediatrics, cardiovascular measurements in the adult population, with similarly wide variation in body size, are rarely corrected for body size. In this review, we describe the critical role of body size measurements in cardiovascular medicine. Using examples, we illustrate the confounding effects of body size. Current cardiovascular scaling practices are reviewed, as are limitations and alternative relationships between body and cardiovascular dimensions. The experimental evidence, theoretical basis, and clinical application of scaling of various functional parameters are presented. Appropriately scaled parameters aid diagnostic and therapeutic decision making in specific disease states such as hypertrophic cardiomyopathy and congestive heart failure. Large-scale studies in clinical populations are needed to define normative relationships for this purpose. Lack of appropriate consideration of body size in the evaluation of cardiovascular structure and function may adversely affect recognition and treatment of cardiovascular disease states in the adult patient.

  View details for DOI 10.1161/CIRCULATIONAHA.107.736785

  View details for PubMedID 18443249

• Statin therapy and exercise induced ventricular arrhythmias 57th Annual Scientific Session of the American-College-of-Cardiology Dewey, F. E., Perez, M., Hadley, D., Sungar, G., Wang, P., Myers, J., Ashley, E. A., Froelicher, V. F. ELSEVIER SCIENCE INC. 2008: A174?A174

  View details for Web of Science ID 000253997101204

• Enhancing the Duke Treadmill Score Rafie, A., Sungar, G. W., Dewey, F. E., Ashley, E. A., Hadley, D., Myers, J., Froelicher, V. F. ELSEVIER SCIENCE INC. 2008: A175?A176

  View details for Web of Science ID 000253997101211

• Independent AV/VV pacing optimization requires operation along mechanical AV delay isochrones Turcott, R. G., Witteles, R., Wang, P. J., Ashley, E. A. ELSEVIER SCIENCE INC. 2008: A21

  View details for Web of Science ID 000253997100088

• Pharmacogenetics of Heart Failure: Evidence, Opportunities, and Challenges for Cardiovascular Pharmacogenomics JOURNAL OF CARDIOVASCULAR TRANSLATIONAL RESEARCH Wheeler, M. T., Ho, M., Knowles, J. W., Pavlovic, A., Ashley, E. A. 2008; 1 (1): 25-36

  Abstract

  Heart failure is a significant medical problem affecting more than five million people in the USA alone. Although clinical trials of pharmacological agents have demonstrated significant reductions in the relative risk of mortality across populations, absolute mortality remains high. In addition, individual variation in response is great. Some of this variation may be explained by genetic polymorphism. In this paper, we review the key studies to date in heart failure pharmacogenetics, setting this against a background of recent progress in the genetics of warfarin metabolism. Several polymorphisms that have supporting molecular and clinical data in the heart failure literature are reviewed, among them the beta1-adrenergic receptor variant Arg389Gly and the angiotensin converting enzyme gene insertion/deletion polymorphism. These variants and others are responsible for a fraction of the total variation seen in the treatment response to heart failure. With the dawn of the genomic age, further pharmacogenetic and new pharmacogenomic studies will advance our ability to tailor the treatment of heart failure.

  View details for DOI 10.1007/s12265-007-9007-8

  View details for Web of Science ID 000207734400008

  View details for PubMedID 20559955

• Ventricular arrhythmias during clinical treadmill testing and prognosis ARCHIVES OF INTERNAL MEDICINE Dewey, F. E., Kapoor, J. R., Williains, R. S., Lipinski, M. J., Ashley, E. A., Hadley, D., Myers, J., Froelicher, V. F. 2008; 168 (2): 225-234

  Abstract

  Although exercise-associated ventricular arrhythmias are frequently observed during exercise testing, their prognostic significance remains uncertain. Therefore, we aimed to evaluate the clinical correlates and prognostic significance of exercise-associated premature ventricular complexes (PVCs) during and after exercise testing.We studied 1847 heart failure-free patients who underwent clinical treadmill testing between March 13, 1997, and January 15, 2004, in the Veterans Affairs Palo Alto Health Care System. Logistic regression was used to evaluate the clinical and exercise test associations of exercise and recovery PVCs. Propensity score-adjusted Cox survival analyses were used to evaluate the prognostic significance of exercise-associated PVCs.Of the 1847 subjects, 850 (46.0%) developed exercise PVCs (median rate, 0.43 per minute) and 620 (33.6%) had recovery PVCs (median rate, 0.60 per minute). Resting PVCs, age, and systolic blood pressure were key predictors of both exercise and recovery PVCs. Whereas exercise PVCs were related to the heart rate increase with exercise, recovery PVCs were related to coronary disease (previous myocardial infarction, coronary revascularization procedure, or pathological Q waves on resting electrocardiogram) and ST-segment depression. During a 5.4-year mean follow-up, 161 subjects (8.7%) died, and 53 of these deaths (32.9%) were due to cardiovascular causes. Recovery PVCs, but not exercise PVCs, were associated with 71% to 96% greater propensity-adjusted mortality rates (hazard ratio, 1.96 [95% confidence interval, 1.31-2.91] for infrequent PVCs; hazard ratio, 1.71 [95% confidence interval, 1.07-2.73] for frequent PVCs compared with subjects without PVCs), and occurrence of recovery PVCs reclassified 33.2% of subjects with intermediate-risk Duke Treadmill Scores into higher-risk subgroups.In our heart failure-free population, recovery PVCs were associated with increased mortality and augmented established risk markers.

  View details for PubMedID 18227372

• Matrix metalloproteinase circulating levels, genetic polymorphisms, and susceptibility to acute myocardial infarction among patients with coronary artery disease AMERICAN HEART JOURNAL Hlatky, M. A., Ashley, E., Quertermous, T., Boothroyd, D. B., Ridker, P., Southwick, A., Myers, R. M., Iribarren, C., Fortmann, S. P., Go, A. S. 2007; 154 (6): 1043-1051

  Abstract

  The aim of this study was to assess systematic differences between patients with acute myocardial infarction (MI) and patients with stable angina in matrix metalloproteinase (MMP) circulating levels and genetic polymorphisms.We identified adults in a large integrated health care delivery system whose initial clinical presentation of coronary disease was either an acute MI or stable exertional angina. A total of 909 patients with acute MI, 466 patients with stable angina, and 1023 healthy older control subjects were genotyped. Serum levels of pro-MMP1, MMP2, MMP3, MMP9, and MMP10 were measured in 199 randomly selected patients from each group.At a median of 15 weeks after initial clinical presentation, higher circulating levels of MMP2 and MMP9 were independently associated with acute MI after statistical adjustment for conventional risk factors, hs-CRP levels, and cardiac medications. By contrast, none of the polymorphisms in MMP1, MMP2, MMP3, MMP9, or MMP10 was significantly associated with either acute MI compared with angina, or with coronary disease compared with controls.Circulating levels of MMP2 and MMP9 are independently associated with development of an acute MI rather than stable angina as the initial clinical presentation of coronary artery disease.

  View details for DOI 10.1016/j.ahj.2007.06.042

  View details for Web of Science ID 000251396200007

  View details for PubMedID 18035073

• Frontiers in nephrology: Genomic approaches to understanding the molecular basis of atherosclerosis JOURNAL OF THE AMERICAN SOCIETY OF NEPHROLOGY Ashley, E. A., Spin, J. M., Tabibiazar, R., Quertermous, T. 2007; 18 (11): 2853-2862

  Abstract

  Atherosclerosis is a complex multicellular disease that is responsible for pathology in various organ systems. The understanding of its initiation and progression has been enhanced in recent years by the application of high-throughput genomic tools such as the microarray. Increasing in genomic coverage, such tools allow a view of the disease unaffected by previous conjecture as to the primary signal of interest. New statistical tools and pathway modeling techniques have established definitively for the first time the central role of inflammation in this process. This article reviews the genomic literature relating to atherosclerosis from cell culture, animal models, and human tissues. In this comparison of these differing approaches, the available data are synthesized to reach a new understanding of the complex interplay between vascular wall and immune system components.

  View details for DOI 10.1681/ASN.2007040514

  View details for Web of Science ID 000250737600012

  View details for PubMedID 17942952

• The cardioregulatory peptide apelin is preferentially expressed by endothelial cells and upregulated in myocardial disease states 80th Annual Scientific Session of the American-Heart-Association (AHA) Kundu, R. K., Sheikh, A. Y., Ho, M. Y., Chun, H. J., Huynh, D. T., Ali, Z. A., Ransohoff, K. J., Connolly, A. J., Ashley, E. A., Robbins, R. C., Quertermous, T. LIPPINCOTT WILLIAMS & WILKINS. 2007: 295?95

  View details for Web of Science ID 000250394301360

• Apelin potently inhibits angiotensin and disease induced superoxide generation and associated vascular remodeling in vein grafts Ali, Z. A., Kojima, Y., Sheikh, A. Y., Ashley, E. A., Quertermous, T. LIPPINCOTT WILLIAMS & WILKINS. 2007: 446

  View details for Web of Science ID 000250394302066

• Emerging role of the apelin system in cardiovascular homeostasis BIOMARKERS IN MEDICINE Chong, K. S., Gardner, R. S., Ashley, E. A., Dargie, H. J., McDonagh, T. A. 2007; 1 (1): 37-43

  Abstract

  The angiotensin receptor-like 1 (APJ) and its novel ligand, apelin, share similarities in structure and anatomical distribution with that of angiotensin II and the angiotensin II type 1 receptor. However, apelin has positive inotropic, vasodilatory and diuretic properties. Differential expression and synthesis of apelin and the APJ receptor in normal and failing hearts suggest that the apelin system may contribute to the pathophysiology of human heart failure and has potential therapeutic use in treatment of heart failure.

  View details for DOI 10.2217/17520363.1.1.37

  View details for Web of Science ID 000252123800012

  View details for PubMedID 20477459

• Magnetic resonance imaging of progressive cardiomyopathic changes in the db/db mouse AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY Yue, P., Arai, T., Terashima, M., Sheikh, A. Y., Cao, F., Charo, D., Hoyt, G., Robbins, R. C., Ashley, E. A., Wu, J., Yang, P. C., Tsao, P. S. 2007; 292 (5): H2106-H2118

  Abstract

  The db/db mouse is a well-established model of diabetes. Previous reports have documented contractile dysfunction (i.e., cardiomyopathy) in these animals, although the extant literature provides limited insights into cardiac structure and function as they change over time. To better elucidate the natural history of cardiomyopathy in db/db mice, we performed cardiac magnetic resonance (CMR) scans on these animals. CMR imaging was conducted with a 4.7-T magnet on female db/db mice and control db/+ littermates at 5, 9, 13, 17, and 22 wk of age. Gated gradient echo sequences were used to obtain cineographic short-axis slices from apex to base. From these images left ventricular (LV) mass (LVM), wall thickness, end-diastolic volume (LVEDV), and ejection fraction (LVEF) were determined. Additionally, cardiac [(18)F]fluorodeoxyglucose ([(18)F]FDG) PET scanning, pressure-volume loops, and real-time quantitative PCR on db/db myocardium were performed. Relative to control, db/db mice developed significant increases in LVM and wall thickness as early as 9 wk of age. LVEDV diverged slightly later, at 13 wk. Interestingly, compared with the baseline level, LVEF in the db/db group did not decrease significantly until 22 wk. Additionally, [(18)F]FDG metabolic imaging showed a 40% decrease in glucose uptake in db/db mice. Furthermore, contractile dysfunction was observed in 15-wk db/db mice undergoing pressure-volume loops. Finally, real-time quantitative PCR revealed an age-dependent recapitulation of the fetal gene program, consistent with a myopathic process. In summary, as assessed by CMR, db/db mice develop characteristic structural and functional changes consistent with cardiomyopathy.

  View details for DOI 10.1152/ajpheart.00856.2006

  View details for PubMedID 17122193

• Do premature ventricular contractions during exercise have the same prognostic value as those during recovery? 56th Annual Scientific Session of the American-College-of-Cardiology Kapoor, J. R., Williams, R. S., Hadley, D., Myers, J., Ashley, E., Froelicher, V. F., Dewey, F. E. ELSEVIER SCIENCE INC. 2007: 111A?111A

  View details for Web of Science ID 000244651800452

• Prognostic value of heart rate increase at onset of exercise testing CIRCULATION Leeper, N. J., Dewey, F. E., Ashley, E. A., Sandri, M., Tan, S. Y., Hadley, D., Myers, J., Froelicher, V. 2007; 115 (4): 468-474

  Abstract

  The initial response of heart rate to dynamic exercise has been proposed as having prognostic value in limited studies that have used modalities other than the treadmill. Our aim was to evaluate the prognostic value of early heart rate parameters in patients referred for routine clinical treadmill testing.The heart rate rise at the onset of exercise was measured in 1959 patients referred for clinical treadmill testing at the Palo Alto (Calif) Veterans Affairs Medical Center from 1997 to 2004. Multivariable Cox survival analysis was performed for 197 all-cause and 74 cardiovascular deaths that accrued during a mean follow-up of 5.4+/-2.1 years. Decreased heart rate changes at all initial relative exercise workloads were associated with significantly increased all-cause mortality. The heart rate rise at one-third total exercise capacity, however, was the only early heart rate variable that significantly predicted both all-cause and cardiovascular risk after adjustment for confounders. Failing to reach 1 SD in the heart rate rise at one-third total exercise capacity was associated with a 28% increased all-cause mortality rate (hazard ratio, 0.72; 95% CI, 0.61 to 0.85; P<0.001) and a 35% cardiovascular mortality rate (hazard ratio, 0.65; 95% CI, 0.49 to 0.86; P=0.003). Of all heart rate measurements considered (initial and recovery), the heart rate increase at peak exercise was the most powerful predictor of cardiovascular prognosis after adjustment for potential confounders. The Duke treadmill score, however, was superior to all heart rate measurements in the prediction of cardiovascular mortality.In the present study population, a rapid initial heart rate rise was associated with improved survival, but the heart rate increase at peak exercise and other conventional measurements such as exercise capacity and the Duke treadmill score were more powerful predictors of prognosis.

  View details for DOI 10.1161/CIRCULATIONAHA.106.666388

  View details for PubMedID 17242274

• Emerging therapies for the management of decompensated heart failure - From bench to bedside JOURNAL OF THE AMERICAN COLLEGE OF CARDIOLOGY DeGoma, E. M., Vagelos, R. H., Fowler, M. B., Ashley, E. A. 2006; 48 (12): 2397-2409

  Abstract

  While pharmaceutical innovation has been highly successful in reducing mortality in chronic heart failure, this has not been matched by similar success in decompensated heart failure syndromes. Despite outstanding issues over definitions and end points, we argue in this paper that an unprecedented wealth of pharmacologic innovation may soon transform the management of these challenging patients. Agents that target contractility, such as cardiac myosin activators and novel adenosine triphosphate-dependent transmembrane sodium-potassium pump inhibitors, provide inotropic support without arrhythmogenic increases in cytosolic calcium or side effects of more traditional agents. Adenosine receptor blockade may improve glomerular filtration and diuresis by exerting a direct beneficial effect on glomerular blood flow while vasopressin antagonists promote free water excretion without compromising renal function and may simultaneously inhibit myocardial remodeling. Urodilatin, the renally synthesized isoform of atrial natriuretic peptide, may improve pulmonary congestion via vasodilation and enhanced diuresis. Finally, metabolic modulators such as perhexiline may optimize myocardial energy utilization by shifting adenosine triphosphate production from free fatty acids to glucose, a unique and conceptually appealing approach to the management of heart failure. These advances allow optimism not only for the advancement of our understanding and management of decompensated heart failure syndromes but for the translational research effort in heart failure biology in general.

  View details for DOI 10.1016/j.jacc.2006.08.039

  View details for Web of Science ID 000242916100001

  View details for PubMedID 17174176

• Network analysis of human in-stent restenosis CIRCULATION Ashley, E. A., Ferrara, R., King, J. Y., Vailaya, A., Kuchinsky, A., He, X., Byers, B., Gerckens, U., Oblin, S., Tsalenko, A., Soito, A., Spin, J. M., Tabibiazar, R., Connolly, A. J., Simpson, J. B., Grube, E., Quertermous, T. 2006; 114 (24): 2644-2654

  Abstract

  Recent successes in the treatment of in-stent restenosis (ISR) by drug-eluting stents belie the challenges still faced in certain lesions and patient groups. We analyzed human coronary atheroma in de novo and restenotic disease to identify targets of therapy that might avoid these limitations.We recruited 89 patients who underwent coronary atherectomy for de novo atherosclerosis (n=55) or in-stent restenosis (ISR) of a bare metal stent (n=34). Samples were fixed for histology, and gene expression was assessed with a dual-dye 22,000 oligonucleotide microarray. Histological analysis revealed significantly greater cellularity and significantly fewer inflammatory infiltrates and lipid pools in the ISR group. Gene ontology analysis demonstrated the prominence of cell proliferation programs in ISR and inflammation/immune programs in de novo restenosis. Network analysis, which combines semantic mining of the published literature with the expression signature of ISR, revealed gene expression modules suggested as candidates for selective inhibition of restenotic disease. Two modules are presented in more detail, the procollagen type 1 alpha2 gene and the ADAM17/tumor necrosis factor-alpha converting enzyme gene. We tested our contention that this method is capable of identifying successful targets of therapy by comparing mean significance scores for networks generated from subsets of the published literature containing the terms "sirolimus" or "paclitaxel." In addition, we generated 2 large networks with sirolimus and paclitaxel at their centers. Both analyses revealed higher mean values for sirolimus, suggesting that this agent has a broader suppressive action against ISR than paclitaxel.Comprehensive histological and gene network analysis of human ISR reveals potential targets for directed abrogation of restenotic disease and recapitulates the results of clinical trials of existing agents.

  View details for DOI 10.1161/CIRCULATIONAHA.106.637025

  View details for Web of Science ID 000243477800015

  View details for PubMedID 17145989

• Opposing cardiovascular roles for the angiotensin and apelin signaling pathways JOURNAL OF MOLECULAR AND CELLULAR CARDIOLOGY Ashley, E., Chun, H. J., Quertermous, T. 2006; 41 (5): 778-781

  View details for DOI 10.1016/j.yjmcc.2006.08.013

  View details for Web of Science ID 000242435200004

  View details for PubMedID 17005196

• Apelin regulates cardiac contractility and rescues neurohormonal heart failure 79th Annual Scientific Session of the American-Heart-Association Ernst, K. V., Ashley, E. A., Charo, D., Kawana, M., Fajardo, G., Bernstein, D., Quertermous, T. LIPPINCOTT WILLIAMS & WILKINS. 2006: 66?66

  View details for Web of Science ID 000241792800321

• Long-term apelin infusion rescues chronic cardiomyopathy and potentiates the effects of ACE-inhibition Sista, R. R., Sheikh, A. Y., Robbins, R. C., Quertermous, T., Ashley, E. A. LIPPINCOTT WILLIAMS & WILKINS. 2006: 486

  View details for Web of Science ID 000241792803209

• Perioperative cardiac risk: pathophysiology, assessment and management. Expert review of cardiovascular therapy Sista, R. R., Ernst, K. V., Ashley, E. A. 2006; 4 (5): 731-743

  Abstract

  Cardiac complications are the leading cause of perioperative morbidity and mortality following noncardiac surgery. The annual cost of perioperative cardiovascular events exceeds 20 billion US dollars. A strategic preoperative evaluation holds the potential to reduce perioperative cardiac events and healthcare costs; however, our current understanding of the pathophysiological basis of postoperative acute coronary syndromes is limited. Although significant advances continue to facilitate early and reliable noninvasive detection of high-risk coronary anatomy, the most appropriate interventions remain unclear. Pharmacotherapy, revascularization, safer anesthesia and early detection of perioperative heart failure may all reduce perioperative morbidity and mortality, although the evidence base is incomplete and controversial. A close working relationship between the primary care physician, cardiologist, surgeon and anesthesiologist will facilitate rational, tailored and optimized management decisions that constitute our best opportunity to reduce perioperative cardiovascular risk.

  View details for PubMedID 17081095

• Biological effects of the novel peptide apelin are uniquely suited to the treatment of acute heart failure 28th Congress of the European-Society-of-Cardiology/World Congress of Cardiology Ashley, E., Charo, D., Ernst, K., Chen, M., Fajardo, G., Kawana, M., Bernstein, D., Quertermous, T. OXFORD UNIV PRESS. 2006: 854?854

  View details for Web of Science ID 000240668406103

• Long-term apelin infusion rescues chronic cardiomyopathy and potentiates the effects of ACE-inhibition Sista, R. R., Sheikh, A. Y., Robbins, R. C., Quertermous, T., Ashley, E. A. CHURCHILL LIVINGSTONE INC MEDICAL PUBLISHERS. 2006: S3

  View details for DOI 10.1016/j.cardfail.2006.06.016

  View details for Web of Science ID 000240205000009

• Apelin regulates cardiac contractility and rescues neurohormonal heart failure 10th Annual Scientific Meeting of the Heart-Failure-Society-of-America Ernst, K. V., Ashley, E. A., Charo, D., Kawana, M., Fajardo, G., Bernstein, D., Quertermous, T. CHURCHILL LIVINGSTONE INC MEDICAL PUBLISHERS. 2006: S1?S1

  View details for Web of Science ID 000240205000003

• Angiotensin-converting enzyme genotype predicts cardiac and autonomic responses to prolonged exercise JOURNAL OF THE AMERICAN COLLEGE OF CARDIOLOGY Ashley, E. A., Kardos, A., Jack, E. S., Habenbacher, W., Wheeler, M., Kim, Y. M., Froning, J., Myers, J., Whyte, G., Froelicher, V., Douglas, P. 2006; 48 (3): 523-531

  Abstract

  The purpose of this study was to investigate the phenomenon of left ventricular (LV) dysfunction after ultraendurance exercise.Subclinical LV dysfunction in response to endurance exercise up to 24 h duration has been described, but its mechanism remains elusive.We tested 86 athletes before and after the Adrenalin Rush Adventure Race using echocardiography, impedance cardiography, and plasma immunoassay.At baseline, athletes demonstrated physiology characteristic of extreme endurance training. After 90 to 120 h of almost-continuous exercise, LV systolic and diastolic function declined (fractional shortening before the race, 39.6 +/- 0.65%; after, 32.2 +/- 0.84%, p < 0.001; mitral inflow E-wave deceleration time before the race, 133 +/- 5 ms; after, 160 +/- 5 ms, n = 48, p < 0.001) without change in loading conditions as defined by LV end-diastolic dimension and total peripheral resistance estimated by thoracic impedance. There was a compensatory increase in heart rate (before, 55 +/- 1.3 beats/min; after, 59 +/- 1.5 beats/min, p = 0.05), which left cardiac output unchanged, as well as significant-but-subclinical increases in brain natriuretic peptide and troponin I. In addition, we found that athletes who were homozygous for the intron-16 insertion polymorphism of the angiotensin-converting enzyme (ACE) gene exhibited a significantly greater decrease in fractional shortening than athletes who were homozygous for the deletion allele. Heterozygotes showed an intermediate phenotype. In addition, the deletion group manifest an enhanced sympathovagal balance after the race, as evidenced by greater power in the low-frequency component of blood pressure variability.The ACE genotype predicts the extent of reversible subclinical LV dysfunction after prolonged exercise and is associated with a differential postactivity augmentation of sympathetic nervous system function that may explain it.

  View details for DOI 10.1016/j.jacc.2006.02.071

  View details for PubMedID 16875979

• Plasma concentrations of the novel peptide apelin are decreased in patients with chronic heart failure EUROPEAN JOURNAL OF HEART FAILURE Chong, K. S., Gardner, R. S., Morton, J. J., Ashley, E. A., McDonagh, T. A. 2006; 8 (4): 355-360

  Abstract

  Apelin, the novel endogenous ligand for the G-protein-coupled receptor APJ, has shown positive inotropic, vasodilatory and diuretic properties in animal studies. Differential expression and synthesis of apelin and APJ receptors have been observed in normal and failing human hearts, suggesting a possible role in cardiovascular homeostasis. Changes in plasma apelin concentrations in relation to heart failure have been described in small studies with conflicting results. Our aim was to evaluate plasma apelin concentrations in a large cohort of patients with chronic heart failure (CHF) across a broad spectrum of disease severity.Plasma apelin concentrations were measured in 202 patients with CHF secondary to left ventricular systolic dysfunction and 22 age-matched controls. Plasma apelin concentrations were significantly lower in patients with CHF, irrespective of NYHA class, ejection fraction or aetiology when compared to age-matched controls (0.85 [0.53-2.04] versus 3.76 [0.85-5.13] ng/ml, p<0.001). Apelin concentrations were correlated with peak VO(2) and right ventricular ejection fraction, but not with age, sex, body mass index, renal function or NT-proBNP concentrations.Plasma apelin concentrations are decreased in patients with CHF. The Apelin-APJ signaling pathway may be a potentially important mediator in the pathophysiological processes of heart failure and may therefore have potential therapeutic implications.

  View details for DOI 10.1016/j.ejheart.2005.10.007

  View details for Web of Science ID 000238750400004

  View details for PubMedID 16464638

• Genomic analysis of human atherectomy specimens predicts superior performance of sirolimus eluting stents Ashley, E., Ferrara, R., King, J. Y., He, X. M., Gerckens, U., Vailaya, A., Kuchinsky, A., Soito, A., Tabibiazar, R., Spin, J., Simpson, J. B., Grube, E., Quertermous, T. ELSEVIER SCIENCE INC. 2006: 9B

  View details for Web of Science ID 000235530500038

• Apelin deficient mice exhibit decreased cardiac contractility, peak oxygen consumption, and exercise capacity: Evidence that apelin is an important endogenous inotrope Charo, D. N., Ashley, E. A., Sheikh, A. Y., Chen, M., Finsterbach, T., Robbins, R. C., Bernstein, D., Quertermous, T. LIPPINCOTT WILLIAMS & WILKINS. 2005: U323

  View details for Web of Science ID 000232956401595

• Pathway analysis of coronary atherosclerosis PHYSIOLOGICAL GENOMICS King, J. Y., Ferrara, R., Tabibiazar, R., Spin, J. M., Chen, M. M., Kuchinsky, A., Vailaya, A., Kincaid, R., Tsalenko, A., Deng, D. X., Connolly, A., Zhang, P., Yang, E., Watt, C., Yakhini, Z., Ben-Dor, A., Adler, A., Bruhn, L., Tsao, P., Quertermous, T., Ashley, E. A. 2005; 23 (1): 103-118

  Abstract

  Large-scale gene expression studies provide significant insight into genes differentially regulated in disease processes such as cancer. However, these investigations offer limited understanding of multisystem, multicellular diseases such as atherosclerosis. A systems biology approach that accounts for gene interactions, incorporates nontranscriptionally regulated genes, and integrates prior knowledge offers many advantages. We performed a comprehensive gene level assessment of coronary atherosclerosis using 51 coronary artery segments isolated from the explanted hearts of 22 cardiac transplant patients. After histological grading of vascular segments according to American Heart Association guidelines, isolated RNA was hybridized onto a customized 22-K oligonucleotide microarray, and significance analysis of microarrays and gene ontology analyses were performed to identify significant gene expression profiles. Our studies revealed that loss of differentiated smooth muscle cell gene expression is the primary expression signature of disease progression in atherosclerosis. Furthermore, we provide insight into the severe form of coronary artery disease associated with diabetes, reporting an overabundance of immune and inflammatory signals in diabetics. We present a novel approach to pathway development based on connectivity, determined by language parsing of the published literature, and ranking, determined by the significance of differentially regulated genes in the network. In doing this, we identify highly connected "nexus" genes that are attractive candidates for therapeutic targeting and followup studies. Our use of pathway techniques to study atherosclerosis as an integrated network of gene interactions expands on traditional microarray analysis methods and emphasizes the significant advantages of a systems-based approach to analyzing complex disease.

  View details for DOI 10.1152/physiolgenomics.00101.2005

  View details for Web of Science ID 000232065200012

  View details for PubMedID 15942018

• Signature patterns of gene expression in mouse atherosclerosis and their correlation to human coronary disease PHYSIOLOGICAL GENOMICS Tabibiazar, R., Wagner, R. A., Ashley, E. A., King, J. Y., Ferrara, R., Spin, J. M., Sanan, D. A., Narasimhan, B., Tibshirani, R., Tsao, P. S., Efron, B., Quertermous, T. 2005; 22 (2): 213-226

  Abstract

  The propensity for developing atherosclerosis is dependent on underlying genetic risk and varies as a function of age and exposure to environmental risk factors. Employing three mouse models with different disease susceptibility, two diets, and a longitudinal experimental design, it was possible to manipulate each of these factors to focus analysis on genes most likely to have a specific disease-related function. To identify differences in longitudinal gene expression patterns of atherosclerosis, we have developed and employed a statistical algorithm that relies on generalized regression and permutation analysis. Comprehensive annotation of the array with ontology and pathway terms has allowed rigorous identification of molecular and biological processes that underlie disease pathophysiology. The repertoire of atherosclerosis-related immunomodulatory genes has been extended, and additional fundamental pathways have been identified. This highly disease-specific group of mouse genes was combined with an extensive human coronary artery data set to identify a shared group of genes differentially regulated among atherosclerotic tissues from different species and different vascular beds. A small core subset of these differentially regulated genes was sufficient to accurately classify various stages of the disease in mouse. The same gene subset was also found to accurately classify human coronary lesion severity. In addition, this classifier gene set was able to distinguish with high accuracy atherectomy specimens from native coronary artery disease vs. those collected from in-stent restenosis lesions, thus identifying molecular differences between these two processes. These studies significantly focus efforts aimed at identifying central gene regulatory pathways that mediate atherosclerotic disease, and the identification of classification gene sets offers unique insights into potential diagnostic and therapeutic strategies in atherosclerotic disease.

  View details for DOI 10.1152/physiolgenomics.00001.2005

  View details for Web of Science ID 000230987900011

  View details for PubMedID 15870398

• Preoperative cardiac evaluation: mechanisms, assessment, and reduction of risk. Thoracic surgery clinics Ashley, E. A., Vagelos, R. H. 2005; 15 (2): 263-275

  Abstract

  The changing paradigm in cardiovascular disease in which atherosclerotic lesions exist in a spectrum of stable to unstable, the lack of a perfect prediction tool, and the paucity of randomized controlled data on appropriate intervention make protection of cardiac patients undergoing thoracic surgery challenging. Nociception-related sympathetic drive combines with inflammatory stimuli and the cardiodepressant effects of anesthesia to create a window of maximum risk in the early postoperative period (8-24 hours), and although multivariate models have shown that a combination of surgery-specific risk, patient-specific cardiovascular history, and estimated functional capacity best determine the need for further investigation, the optimal choice of investigation is unclear. Exercise or dobutamine stress echocardiography provide the best validated investigations, and in the case of poor images, dobutamine MR imaging is increasingly used. When disease is found, medical and interventional options are available. PCI is often used, but the risk of converting a stable flow-limiting lesion into a less stable non-flow-limiting lesion must be considered, along with a delay for anti-platelet therapy and endothelialization of the stent. Alternatively, medical protection with acute beta-blockade or alpha2-agonists reduces risk (although beta-blockade often is avoided in chronic lung disease, even nonselective agents are safe in patients with non-airways reactive COPD). In addition, it is likely that statin use reduces risk, probably by stabilizing plaques, but patients with cardiac risk are increasingly likely to be taking this medication already. The assessment and management of cardiac risk in the perioperative thoracic surgery patient is challenging. With focused, rational, and individually tailored management; tight monitoring of postoperative pain; and a close working relationship between the surgeon, anesthesiologist, and cardiologist, patient care can be optimized, and risk can be effectively controlled.

  View details for PubMedID 15999524

• Mouse strain-specific differences in vascular wall gene expression and their relationship to vascular disease ARTERIOSCLEROSIS THROMBOSIS AND VASCULAR BIOLOGY Tabibiazar, R., Wagner, R. A., Spin, J. M., Ashley, E. A., Narasimhan, B., Rubin, E. M., Efron, B., Tsao, P. S., Tibshirani, R., Quertermous, T. 2005; 25 (2): 302-308

  Abstract

  Different strains of inbred mice exhibit different susceptibility to the development of atherosclerosis. The C3H/HeJ and C57Bl/6 mice have been used in several studies aimed at understanding the genetic basis of atherosclerosis. Under controlled environmental conditions, variations in susceptibility to atherosclerosis reflect differences in genetic makeup, and these differences must be reflected in gene expression patterns that are temporally related to the development of disease. In this study, we sought to identify the genetic pathways that are differentially activated in the aortas of these mice.We performed genome-wide transcriptional profiling of aortas from C3H/HeJ and C57Bl/6 mice. Differences in gene expression were identified at baseline as well as during normal aging and longitudinal exposure to high-fat diet. The significance of these genes to the development of atherosclerosis was evaluated by observing their temporal pattern of expression in the well-studied apolipoprotein E model of atherosclerosis.Gene expression differences between the 2 strains suggest that aortas of C57Bl/6 mice have a higher genetic propensity to develop inflammation in response to appropriate atherogenic stimuli. This study expands the repertoire of factors in known disease-related signaling pathways and identifies novel candidate genes for future study. To gain insights into the molecular pathways that are differentially activated in strains of mice with varied susceptibility to atherosclerosis, we performed comprehensive transcriptional profiling of their vascular wall. Genes identified through these studies expand the repertoire of factors in disease-related signaling pathways and identify novel candidate genes in atherosclerosis.

  View details for DOI 10.1161/011.ATV.0000151372.86863.a5

  View details for Web of Science ID 000226594000009

  View details for PubMedID 15550693

• The endogenous peptide apelin potently improves cardiac contractility and reduces cardiac loading in vivo CARDIOVASCULAR RESEARCH Ashley, E. A., Powers, J., Chen, M., Kundu, R., Finsterbach, T., Caffarelli, A., Deng, A., Eichhorn, J., Mahajan, R., Agrawal, R., Greve, J., Robbins, R., Patterson, A. J., Bernstein, D., Quertermous, T. 2005; 65 (1): 73-82

  Abstract

  The endogenous peptide apelin is differentially regulated in cardiovascular disease but the nature of its role in cardiac function remains unclear.We investigated the functional relevance of this peptide using ECG and respiration gated magnetic resonance imaging, conductance catheter pressure-volume hemodynamic measurements, and echocardiography in vivo. In addition, we carried out histology and immunohistochemistry to assess cardiac hypertrophy and to localize apelin and APJ in the adult and embryonic mouse heart.Intraperitoneal injection of apelin (300 microg/kg) resulted in a decrease in left ventricular end diastolic area (pre: 0.122+/-0.007; post: 0.104+/-0.005 cm(2), p=0.006) and an increase in heart rate (pre: 537+/-20; post: 559+/-19 beats per minute, p=0.03). Hemodynamic measurements revealed a marked increase in ventricular elastance (pre: 3.7+/-0.9; post: 6.5+/-1.4 mm Hg/RVU, p=0.018) and preload recruitable stroke work (pre: 27.4+/-8.0; post: 51.8+/-3.1, p=0.059) with little change in diastolic parameters following acute infusion of apelin. Chronic infusion (2 mg/kg/day) resulted in significant increases in the velocity of circumferential shortening (baseline: 5.36+/-0.401; 14 days: 6.85+/-0.358 circ/s, p=0.049) and cardiac output (baseline: 0.142+/-0.019; 14 days: 0.25+/-0.019 l/min, p=0.001) as determined by 15 MHz echocardiography. Post-mortem corrected heart weights were not different between apelin and saline groups (p=0.5) and histology revealed no evidence of cellular hypertrophy in the apelin group (nuclei per unit area, p=0.9). Immunohistochemistry studies revealed APJ staining of myocardial cells in all regions of the adult mouse heart. Antibody staining, as well as quantitative real time polymerase chain reaction identified expression of both APJ and apelin in embryonic myocardium as early as embryonic day 13.5.Apelin reduces left ventricular preload and afterload and increases contractile reserve without evidence of hypertrophy. These results associate apelin with a positive hemodynamic profile and suggest it as an attractive target for pharmacotherapy in the setting of heart failure.

  View details for DOI 10.1016/j.cardiores.2004.08.018

  View details for Web of Science ID 000226477600011

  View details for PubMedID 15621035

  View details for PubMedCentralID PMC2517138

• Transcriptional profiling of in vitro smooth muscle cell differentiation identifies specific patterns of gene and pathway activation PHYSIOLOGICAL GENOMICS Spin, J. M., Nallamshetty, S., Tabibiazar, R., Ashley, E. A., King, J. Y., Chen, M., Tsao, P. S., Quertermous, T. 2004; 19 (3): 292-302

  Abstract

  Mesodermal and epidermal precursor cells undergo phenotypic changes during differentiation to the smooth muscle cell (SMC) lineage that are relevant to pathophysiological processes in the adult. Molecular mechanisms that underlie lineage determination and terminal differentiation of this cell type have received much attention, but the genetic program that regulates these processes has not been fully defined. Study of SMC differentiation has been facilitated by development of the P19-derived A404 embryonal cell line, which differentiates toward this lineage in the presence of retinoic acid and allows selection for cells adopting a SMC fate through a differentiation-specific drug marker. We sought to define global alterations in gene expression by studying A404 cells during SMC differentiation with oligonucleotide microarray transcriptional profiling. Using an in situ 60-mer array platform with more than 20,000 mouse genes derived from the National Institute on Aging clone set, we identified 2,739 genes that were significantly upregulated after differentiation was completed (false-detection ratio <1). These genes encode numerous markers known to characterize differentiated SMC, as well as many unknown factors. We further characterized the sequential patterns of gene expression during the differentiation time course, particularly for known transcription factor families, providing new insights into the regulation of the differentiation process. Changes in genes associated with specific biological ontology-based pathways were evaluated, and temporal trends were identified for functional pathways. In addition to confirming the utility of the A404 model, our data provide a large-scale perspective of gene regulation during SMC differentiation.

  View details for DOI 10.1152/physiolgenomics.00148.2004

  View details for PubMedID 15340120

• Prognostic value of corrected JT and QT intervals 77th Scientific Meeting of the American-Heart-Association Engel, G., Yamazaki, T., Ashley, E. A., Wang, P., Froelicher, V. F. LIPPINCOTT WILLIAMS & WILKINS. 2004: 623?23

  View details for Web of Science ID 000224783503348

• The cardiovascular regulator apelin is an angiogenic factor in vivo Kundu, R. K., Eichhorn, J., Chen, M., Ho, Y. D., Ashley, E., Varner, J., Kuo, C., Quertermous, T. LIPPINCOTT WILLIAMS & WILKINS. 2004: 173

  View details for Web of Science ID 000224783500824

• Electrocardiographic arrhythmia risk testing CURRENT PROBLEMS IN CARDIOLOGY Engel, G., Beckerman, J. G., Froelicher, V. F., Yamazaki, T., Chen, H. A., Richardson, K., McAuley, R. J., Ashley, E. A., Chun, S., Wang, P. J. 2004; 29 (7): 365-432

  Abstract

  Among the most compelling challenges facing cardiologists today is identification of which patients are at highest risk for sudden death. Automatic implantable cardioverter-defibrillators are now indicated in many of these patients, yet the role of noninvasive risk stratification in classifying patients at high risk is not well defined. The purpose of this review is to evaluate the various electrocardiographic (ECG) techniques that appear to have potential in assessment of risk for arrhythmia. The resting ECG (premature ventricular contractions, QRS duration, damage scores, QT dispersion, and ST segment and T wave abnormalities), T wave alternans, late potentials identified on signal-averaged ECGs, and heart rate variability are explored. Unequivocal evidence to support the widespread use of any single noninvasive technique is lacking; further research in this area is needed. It is likely that a combination of risk evaluation techniques will have the greatest predictive power in enabling identification of patients most likely to benefit from device therapy.

  View details for DOI 10.1016/j.cpcardiol.2004.02.007

  View details for PubMedID 15192691

• Nitric oxide control of cardiac function: is neuronal nitric oxide synthase a key component? PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES Sears, C. E., Ashley, E. A., Casadei, B. 2004; 359 (1446): 1021-1044

  Abstract

  Nitric oxide (NO) has been shown to regulate cardiac function, both in physiological conditions and in disease states. However, several aspects of NO signalling in the myocardium remain poorly understood. It is becoming increasingly apparent that the disparate functions ascribed to NO result from its generation by different isoforms of the NO synthase (NOS) enzyme, the varying subcellular localization and regulation of NOS isoforms and their effector proteins. Some apparently contrasting findings may have arisen from the use of non-isoform-specific inhibitors of NOS, and from the assumption that NO donors may be able to mimic the actions of endogenously produced NO. In recent years an at least partial explanation for some of the disagreements, although by no means all, may be found from studies that have focused on the role of the neuronal NOS (nNOS) isoform. These data have shown a key role for nNOS in the control of basal and adrenergically stimulated cardiac contractility and in the autonomic control of heart rate. Whether or not the role of nNOS carries implications for cardiovascular disease remains an intriguing possibility requiring future study.

  View details for DOI 10.1098/rstb.2004.1477

  View details for Web of Science ID 000222444800012

  View details for PubMedID 15306414

• Cardiology Explained ISBN: 1901346226 2004
• Hemodynamic effects of apelin in mice: Initial characterization of a potential inotropic agent Mahajan, R., Agrawal, R., Patterson, A. J., Ashley, E., Thomas, Q. LIPPINCOTT WILLIAMS & WILKINS. 2003: A32

  View details for Web of Science ID 000187636500119

• Better decisions through science: Exercise testing scores CURRENT PROBLEMS IN CARDIOLOGY Froelicher, Shetler, K., Ashley, E. 2003; 28 (11): 589?620

  View details for DOI 10.1016/j.cpcardiol.2003.10.004

  View details for Web of Science ID 000187585700001

• Novel role for the potent endogenous inotrope apelin in human cardiac dysfunction CIRCULATION Chen, M. M., Ashley, E. A., Deng, D. X., Tsalenko, A., Deng, A., Tabibiazar, R., Ben-Dor, A., Fenster, B., Yang, E., King, J. Y., Fowler, M., Robbins, R., Johnson, F. L., Bruhn, L., McDonagh, T., Dargie, H., Yakhini, Z., Tsao, P. S., Quertermous, T. 2003; 108 (12): 1432-1439

  Abstract

  Apelin is among the most potent stimulators of cardiac contractility known. However, no physiological or pathological role for apelin-angiotensin receptor-like 1 (APJ) signaling has ever been described.We performed transcriptional profiling using a spotted cDNA microarray with 12 814 unique clones on paired samples of left ventricle obtained before and after placement of a left ventricular assist device in 11 patients. The significance analysis of microarrays and a novel rank consistency score designed to exploit the paired structure of the data confirmed that natriuretic peptides were among the most significantly downregulated genes after offloading. The most significantly upregulated gene was the G-protein-coupled receptor APJ, the specific receptor for apelin. We demonstrate here using immunoassay and immunohistochemical techniques that apelin is localized primarily in the endothelium of the coronary arteries and is found at a higher concentration in cardiac tissue after mechanical offloading. These findings imply an important paracrine signaling pathway in the heart. We additionally extend the clinical significance of this work by reporting for the first time circulating human apelin levels and demonstrating increases in the plasma level of apelin in patients with left ventricular dysfunction.The apelin-APJ signaling pathway emerges as an important novel mediator of cardiovascular control.

  View details for DOI 10.1161/01.CIR.0000091235.94914.75

  View details for PubMedID 12963638

• Cardiac neuronal nitric oxide synthase isoform regulates myocardial contraction and calcium handling 75th Annual Scientific Session of the American-Heart-Association Sears, C. E., Bryant, S. M., Ashley, E. A., Lygate, C. A., Rakovic, S., Wallis, H. L., Neubauer, S., Terrar, D. A., Casadei, B. LIPPINCOTT WILLIAMS & WILKINS. 2003: E52?E59

  Abstract

  A neuronal isoform of nitric oxide synthase (nNOS) has recently been located to the cardiac sarcoplasmic reticulum (SR). Subcellular localization of a constitutive NOS in the proximity of an activating source of Ca2+ suggests that cardiac nNOS-derived NO may regulate contraction by exerting a highly specific and localized action on ion channels/transporters involved in Ca2+ cycling. To test this hypothesis, we have investigated myocardial Ca2+ handling and contractility in nNOS knockout mice (nNOS-/-) and in control mice (C) after acute nNOS inhibition with 100 micromol/L L-VNIO. nNOS gene disruption or L-VNIO increased basal contraction both in left ventricular (LV) myocytes (steady-state cell shortening 10.3+/-0.6% in nNOS-/- versus 8.1+/-0.5% in C; P<0.05) and in vivo (LV ejection fraction 53.5+/-2.7 in nNOS-/- versus 44.9+/-1.5% in C; P<0.05). nNOS disruption increased ICa density (in pA/pF, at 0 mV, -11.4+/-0.5 in nNOS-/- versus -9.1+/-0.5 in C; P<0.05) and prolonged the slow time constant of inactivation of ICa by 38% (P<0.05), leading to an increased Ca2+ influx and a greater SR load in nNOS-/- myocytes (in pC/pF, 0.78+/-0.04 in nNOS-/- versus 0.64+/-0.03 in C; P<0.05). Consistent with these data, [Ca2+]i transient (indo-1) peak amplitude was greater in nNOS-/- myocytes (410/495 ratio 0.34+/-0.01 in nNOS-/- versus 0.31+/-0.01 in C; P<0.05). These findings have uncovered a novel mechanism by which intracellular Ca2+ is regulated in LV myocytes and indicate that nNOS is an important determinant of basal contractility in the mammalian myocardium. The full text of this article is available at http://www.circresaha.org.

  View details for DOI 10.1161/01.RES.0000064585.95749.6D

  View details for Web of Science ID 000181711300017

  View details for PubMedID 12623875

• Exercise testing scores as an example of better decisions through science MEDICINE AND SCIENCE IN SPORTS AND EXERCISE Ashley, E., Myers, J., Froelicher, V. 2002; 34 (8): 1391-1398

  Abstract

  The application of common statistical techniques to clinical and exercise test data has the potential to become a useful tool for assisting in the diagnosis of coronary artery disease, assessing prognosis, and reducing the cost of evaluating patients with suspected coronary disease. Since general practitioners function as gatekeepers and decide which patients must be referred to the cardiologist, they need to optimally use the basic tools they have available (i.e., history, physical exam, and the exercise test).Review of the literature with a focus on the scientific techniques for aiding the decision-making process.Scores derived from multivariable statistical techniques considering clinical and exercise data have demonstrated superior discriminating power when compared using receiver-operating-characteristic curves with the ST segment response. In addition, by stratifying patients as to probability of disease and prognosis, they provide a management strategy. While computers as part of information management systems can calculate complicated equations to provide scores, physicians are reluctant to trust them. Thus, these scores have been represented as nomograms or simple additive tables so physicians are comfortable with their application. Scores have also been compared with physician judgment and been found to estimate the presence of coronary disease and prognosis as well as expert cardiologists, and often better than nonspecialists.Multivariate scores can empower the clinician to assure the cardiac patient with access to appropriate and cost-effective cardiological care.

  View details for PubMedID 12165697

• Cardiac nitric oxide synthase 1 regulates basal and beta-adrenergic contractility in murine ventricular myocytes CIRCULATION Ashley, E. A., Sears, C. E., Bryant, S. M., Watkins, H. C., Casadei, B. 2002; 105 (25): 3011-3016

  Abstract

  Evidence indicates that myocardial NO production can modulate contractility, but the source of NO remains uncertain. Here, we investigated the role of a type 1 NO synthase isoform (NOS1), which has been recently localized to the cardiac sarcoplasmic reticulum, in the regulation of basal and beta-adrenergic myocardial contraction.Contraction was assessed in left ventricular myocytes isolated from mice with NOS1 gene disruption (NOS1(-/-) mice) and their littermate controls (NOS1(+/+) mice) at 3 stimulation frequencies (1, 3, and 6 Hz) in basal conditions and during beta-adrenergic stimulation with isoproterenol (2 nmol/L). In addition, we examined the effects of acute specific inhibition of NOS1 with vinyl-L-N-5-(1-imino-3-butenyl)-L-ornithine (L-VNIO, 500 micromol/L). NOS1((-/-)) myocytes exhibited greater contraction at all frequencies (percent cell shortening at 6 Hz, 10.7+/-0.92% in NOS1(-/-) myocytes versus 7.21+/-0.8% in NOS1(+/+) myocytes; P<0.05) with a flat frequency-contraction relationship. Time to 50% relaxation was increased in NOS1(-/-) myocytes at all frequencies (at 6 Hz, 26.53+/-1.4 ms in NOS1(-/-) myocytes versus 21.27+/-1.3 ms in NOS1(+/+) myocytes; P<0.05). L-VNIO prolonged time to 50% relaxation at all frequencies (at 6 Hz, 21.28+/-1.7 ms in NOS1(+/+) myocytes versus 26.45+/-1.4 ms in NOS1(+/+)+L-VNIO myocytes; P<0.05) but did not significantly increase basal contraction. However, both NOS1(-/-) myocytes and NOS1(+/+) myocytes treated with L-VNIO showed a greatly enhanced contraction in response to beta-adrenergic stimulation (percent increase in contraction at 6 Hz, 25.2+/-10.8 in NOS1(+/+) myocytes, 68.2+/-11.2 in NOS1(-/-) myocytes, and 65.1+/-13.2 in NOS1(+/+)+L-VNIO myocytes; P<0.05).NOS1 disruption enhances basal contraction and the inotropic response to beta-adrenergic stimulation in murine ventricular myocytes. These findings indicate that cardiac NOS1-derived NO plays a significant role in the autocrine regulation of myocardial contractility.

  View details for DOI 10.1161/01.CIR.0000019516.31040.2D

  View details for Web of Science ID 000176818800026

  View details for PubMedID 12081996

• Diagnosing coronary artery disease in diabetic patients DIABETES-METABOLISM RESEARCH AND REVIEWS Ashley, E. A., Raxwal, V., Finlay, M., Froelicher, V. 2002; 18 (3): 201-208

  Abstract

  Although several diagnostic modalities are available to the clinician interested in diagnosing coronary artery disease, very few have been validated in diabetic populations. This review discusses the non-invasive diagnosis of coronary disease in diabetic patients. Evidence regarding the prevalence and prognostic significance of silent ischemia is reviewed and the potential impact of silent ischemia on the diagnostic characteristics of the exercise treadmill test discussed. Other diagnostic tools are considered, and recommendations are made with respect to screening asymptomatic diabetic patients for coronary artery disease.

  View details for DOI 10.1002/dmrr.297

  View details for Web of Science ID 000176838800005

  View details for PubMedID 12112938

• Better decisions through science: Exercise testing scores PROGRESS IN CARDIOVASCULAR DISEASES Froelicher, V., Shetler, K., Ashley, E. 2002; 44 (5): 395-414

  Abstract

  Statistical tools can be used to create scores for assisting in the diagnosis of coronary artery disease and assessing prognosis. General practitioners and internists frequently function as gatekeepers, deciding which patients must be referred to the cardiologist. Therefore, they need to use the basic tools they have available (ie, history, physical examination and the exercise test) in an optimal fashion. Scores derived from multivariable statistical techniques considering clinical and exercise data have demonstrated superior discriminating power compared with diagnosis only using the ST segment response. In addition, by stratifying patients as to probability of disease and prognosis, they provide a more practical management strategy than a response of normal or abnormal. Although computers, as part of information management systems, can calculate complicated equations and derive these scores, physicians are reluctant to trust them. However, when represented as nomograms or simple additive discrete pieces of information, scores are more readily accepted. The scores have been compared with physician judgment and have been found to estimate the presence of coronary disease and prognosis as well as expert cardiologists and often better than nonspecialists. However, the discriminating power of specific variables from the medical history and exercise test remains unclear because of inadequate study design and differences in study populations. Should expired gases be substituted for estimated METs? Should ST/heart rate index be used instead of putting ST depression and heart rate separately into the models? Should right-sided chest leads and heart rate in recovery be considered? There is a need for further evaluation of these easily obtained variables to improve the accuracy of prediction algorithms, especially in women. The portability and reliability of scores must be ensured because access to specialized care must be safeguarded. Assessment of the clinical and exercise test data and application of the newer scores can empower the clinician to assure the cardiac patient access to appropriate and cost-effective cardiologic care.

  View details for DOI 10.1053/pcad.2002.122693

  View details for PubMedID 12024337

• An evidence-based review of the resting electrocardiogram as a screening technique for heart disease PROGRESS IN CARDIOVASCULAR DISEASES Ashley, E. A., Raxwal, V., Froelicher, V. 2001; 44 (1): 55-67

  Abstract

  Given renewed interest in the primary prevention of cardiovascular disease, we comprehensively reviewed the utility of the electrocardiogram (ECG) for screening considering the seminal epidemiologic studies. It appears that conventional risk factors relate to long-term risk, while ECG abnormalities are better predictors of short-term risk. For individual ECG abnormalities as well as for pooled categories of ECG abnormalities, the sensitivity of the ECG for future events was too low for it to be practical as a screening tool. This almost certainly relates to the low prevalence of these abnormalities. However, all ECG abnormalities increase with age and pre-test risk. Also screening with the ECG is of minimal cost and likely to decrease further as stand-alone machines are replaced by integration into personal computers (PC). Another potential impact on performing screening ECGs would be distribution and availability of digitized ECG data via the World Wide Web. For clinical utility of ECG data, comparison with previous ECGs can be critical but is currently limited. PC based ECG systems could very easily replace many of the ECG machines in use that only have paper output. PC-ECG systems would also permit interaction with computerized medical information systems, facilitate emailing and faxing of ECGs as well as storage at a centralized web-server. Web-enabled ECG recorders similar to the new generation of home appliances could follow this quick PC solution. A serious goal for the medical industry should be to end the morass of proprietary ECG digital formats and follow a standardized format. This could lead to a network of web-servers from which every patient's ECGs would be available. Such a situation could have a dramatic effect on the advisability of performing screening ECGs.

  View details for DOI 10.1053/pcad.2001.24683

  View details for Web of Science ID 000170847500005

  View details for PubMedID 11533927

• Sex, the heart, and sildenafil. Current problems in cardiology Alloggiamento, T., Zipp, C., Raxwal, V. K., Ashley, E., Dey, S., LEVINE, S., Froelicher, V. F. 2001; 26 (6): 388-415

  View details for PubMedID 11391247

• The post myocardial infarction exercise test: still worthy after all of these years EUROPEAN HEART JOURNAL Ashley, E. A., Froelicher, V. 2001; 22 (4): 273-276

  View details for Web of Science ID 000166913400003

  View details for PubMedID 11161942

• Exercise testing in clinical medicine LANCET Ashley, E. A., Myers, J., Froelicher, V. 2000; 356 (9241): 1592-1597

  Abstract

  Exercise-induced changes in the electrocardiogram have been used to identify coronary artery disease for almost a century. Over the past decade, however, clinicians have increasingly focused on more expensive diagnostic tools believing them to offer improved diagnostic accuracy. In fact, by incorporating historical data, the simple exercise test can in most cases outperform the newer tests. The use of prediction equations and non-staged exercise protocols can improve the test still further, while advances in the use of the test for prognosis, with the discovery of novel risk factors and the addition of gas analysis, may in the future shift the primary emphasis away from diagnosis. Brief, inexpensive, and done in most cases without the presence of a cardiologist, the exercise test offers the highest value for predictive accuracy of any of the non-invasive tests for coronary artery disease.

  View details for Web of Science ID 000165134500038

  View details for PubMedID 11075788

• Computer applications in the interpretation of the exercise electrocardiogram SPORTS MEDICINE Ashley, E. A., Froelicher, V. F. 2000; 30 (4): 231-248

  Abstract

  The exercise electrocardiogram remains the noninvasive diagnostic test of first choice in patients with coronary artery disease. While new technology offers novel diagnostic possibilities and the ability to assess patients unsuitable for exercise testing, no other investigation has to this point furnished the quality of functional information and value-for-predictive accuracy of exercise electrocardiography. In this article, we describe how this central position in the work up of the cardiac patient has been secured through the evolution of the microprocessor. Particularly important has been its ability to harness and present large volumes of raw data, to derive and manipulate multivariate equations for diagnostic prediction, and to run 'expert' systems which can pool demographic and exercise test data, calculate risk scores, and prompt the nonexpert with advice on current management. These key features explain the pivotal role of the exercise test in the diagnostic, and increasingly prognostic, armoury of the cardiovascular clinician.

  View details for Web of Science ID 000089841100001

  View details for PubMedID 11048772

• Medical education - beyond tomorrow? The new doctor - Asclepiad or Logiatros? MEDICAL EDUCATION Ashley, E. A. 2000; 34 (6): 455-459

  Abstract

  Against a background of the theoretical basis for the contextual approach to medical education, this paper examines and supports the changes that are occurring in undergraduate medical education throughout the world, before putting up for discussion the suggestion that the changes have not gone far enough. Consideration is given to a model of apprenticeship learning within undergraduate medical education, to the benefits it may offer, and to some of the challenges inherent in its implementation.

  View details for Web of Science ID 000086920800011

  View details for PubMedID 10792686

• The prevalence and prognostic significance of electrocardiographic abnormalities. Current problems in cardiology Ashley, E. A., Raxwal, V. K., Froelicher, V. F. 2000; 25 (1): 1-72

  View details for PubMedID 10705558

• The prevalence and prognostic significance of electrocardiographic abnormalities CURRENT PROBLEMS IN CARDIOLOGY Ashley, E. A., Raxwal, V. K., Froelicher, V. F. 2000; 25 (1): 7-72

  View details for Web of Science ID 000085137200002

• Dangerous curves - A perspective on exercise, lactate, and the anaerobic threshold CHEST Myers, J., Ashley, E. 1997; 111 (3): 787-795

  Abstract

  A number of general observations can be made from these recent studies. Lactate is a ubiquitous substance that is produced and removed from the body at all times, even at rest, both with and without the availability of oxygen. It is now recognized that lactate accumulates in the blood for several reasons, not just the fact that oxygen supply to the muscle is inadequate. Lactate production and removal is a continuous process; it is a change in the rate of one or the other that determines the blood lactate level. Rather than a specific threshold, there is most likely a period of time during which lactate production begins to exceed the body's capacity to remove it (through buffering or oxidation in other fibers). It may be appropriate to replace the term "anaerobic threshold" to a more functional description, since the muscles are never entirely anaerobic nor is there always a distinct threshold ("oxygen independent glycolysis" among others has been suggested) Lactate plays a major role as a metabolic substrate during exercise, is the preferred fuel for slow-twitch muscle fibers, and is a precursor for liver gluconeogenesis. The point at which lactate begins to accumulate in the blood, causing an increase in ventilation, is important to document clinically. Irrespective of the underlying mechanism or specific model that describes the process, the physiologic changes associated with lactate accumulation have significant import for cardiopulmonary performance. These include metabolic acidosis, impaired muscle contraction, hyperventilation, and altered oxygen kinetics, all of which contribute to an impaired capacity to perform work. Thus, any delay in the accumulation of blood lactate which can be attributed to an intervention (drug, exercise training, surgical, etc) may add important information concerning the efficacy of the intervention. A substantial body of evidence is available demonstrating that lactate accumulation occurs later (shifting to a higher percentage of Vo2max) after a period of endurance training. In athletes, the level of work that can be sustained prior to lactate accumulation, visually determined, is an accurate predictor of endurance performance. Presumably, these concepts have implications related to vocation/disability among patients with cardiovascular and pulmonary disease, but few such applied studies have been performed outside the laboratory. Blood lactate during exercise and its associated ventilatory changes maintain useful and interesting applications in both the clinical exercise laboratory and the sport sciences. However, the mechanism, interpretation, and application of these changes continue to rely more on tradition and convenience than science.

  View details for Web of Science ID A1997WM94600041

  View details for PubMedID 9118720

• Hormonal responses to graded-resistance, PES-assisted strength training in spinal cord-injured SPINAL CORD Wheeler, G. D., Ashley, E. A., Harber, V., Laskin, J. J., OLENIK, L. M., Sloley, D., Burnham, R., Steadward, R. D., Cumming, D. C. 1996; 34 (5): 264-267

  Abstract

  Functional electrical stimulation (FES) assisted resistance training has been effective in increasing muscular strength and endurance in spinal cord injured men and women in preparation for FES-assisted cycle programs and for FES-assisted standing and walking. Increases in blood pressure and a concomitant bradycardia suggestive of autonomic dysreflexia have been reported during FES-assisted resistance training. Self-induced autonomic dysreflexia in athletes who use wheelchairs suppressed the normal exercise induced serum testosterone increase. We, therefore, examined the changes in hematocrit and circulating levels of testosterone, sex hormone binding globulin (SHBG), cortisol, prolactin, norepinephrine and epinephrine during FES assisted resistance exercise in five high spinal cord injured men (SCI) and comparable maximal exercise in five able bodied controls (AB). Mean serum testosterone levels significantly increased with FES-assisted resistance training in SCI and maximal resistance exercise in AB with no significant change in hematocrit or SHBG. Prolactin, cortisol and epinephrine levels were unchanged while norepinephrine levels were significantly increased in SCI and AB. These findings suggest that there is no concern over inadequate physiological androgen response to an exercise stimulus in SCI. The data do not support the previous findings that elevated levels of norepinephrine in autonomic dysreflexia suppress testosterone response to exercise.

  View details for Web of Science ID A1996UR61200003

  View details for PubMedID 8963972

• EVIDENCE OF AUTONOMIC DYSREFLEXIA DURING FUNCTIONAL ELECTRICAL-STIMULATION IN INDIVIDUALS WITH SPINAL-CORD INJURIES PARAPLEGIA Ashley, E. A., Laskin, J. J., OLENIK, L. M., Burnham, R., Steadward, R. D., Cumming, D. C., Wheeler, G. D. 1993; 31 (9): 593-605

  Abstract

  The purpose of the investigation was to examine the safety and efficacy of functional electrical stimulation (FES)-assisted hydraulic resistance training in improving cardiovascular fitness in persons with spinal cord injuries. The cardiopulmonary responses of 10 high spinal cord injured (SCI) and five able bodied (AB) subjects were assessed during three bouts of FES-assisted leg extension exercise. The protocol involved three 30-minute tests: (1) unloaded leg extension, (2) hydraulically-resisted leg extension (loaded), and (3) a reproduction of the unloaded and loaded protocols to measure cardiac output (Q). Pre-measurements were made of body mass, mean limb weight, maximal force output and maximal oxygen uptake (incremental arm ergometry). Oxygen uptake (VO2), minute ventilation (Ve), respiratory exchange ratio (RER), heart rate (HR), blood pressure (BP) were recorded before, during and after tests. There was a significant difference in VO2 max between SCI and AB subjects. Cardiac output significantly increased between the loaded and unloaded tests. The significant increases from rest to unloaded and loaded exercise pointed to the potential value of adding resistance to a leg extension training regime. Heart rate and BP of the participants with SCI consistently demonstrated a response suggestive of autonomic dysreflexia. Upon stimulation an immediate increase in (predominantly systolic) BP was observed, followed by a fall in HR. On cessation of stimulation HR exhibited a substantial rebound effect and BP returned to normal levels. This response was highly reproducible and suggests caution be exercised in the use of FES for people with SCI with lesion levels above the major splanchnic outflow (T6).

  View details for Web of Science ID A1993LX59600006

  View details for PubMedID 8247602

• ELECTRICAL STIMULATION-ASSISTED ROWING EXERCISE IN SPINAL-CORD INJURED PEOPLE - A PILOT-STUDY PARAPLEGIA Laskin, J. J., Ashley, E. A., OLENIK, L. M., Burnham, R., Cumming, D. C., Steadward, R. D., Wheeler, G. D. 1993; 31 (8): 534-541

  Abstract

  Recently a FES (functional electrical stimulation)-assisted rowing machine was developed to enhance cardiovascular training in people with spinal cord injuries. The machine was assessed in terms of its efficacy as a training tool. Six patients who were quadriplegic (C6-T1) and 2 who were paraplegic (T3-6) completed a series of three tests in succession: (1) leg stimulation only (quadriceps and hamstring groups)--'Stim', (2) arm row only--'Row' and (3) simultaneous row and stimulation--'R & S'. Measurements recorded included oxygen uptake (VO2), minute ventilation (Ve), respiratory exchange ratio (RER), heart rate (HR) and blood pressure (BP). In addition, 6 out of the 8 subjects took part in a qualitative assessment comprising a guided interview exploring the subject's perception of the machine and test. Significant increases in VO2 were demonstrated between the three tests with R & S producing mean steady-state values of 16.34 nm (+/- 0.74) ml/kg/min (83% of maximum). These values represented a 12% increase over Row alone. Of interest was the qualitative assessment which revealed that subjects perceived R & S to be easier than Row despite the higher levels of VO2 observed. The results suggest that the rowing machine represents a potentially valuable hybrid training device that may significantly reduce risk factors for cardiovascular disease and improve the quality of life of people with SCI.

  View details for Web of Science ID A1993LR02900009

  View details for PubMedID 8414639