Bio

Clinical Focus


  • Pediatric Lung and Heart-Lung Transplantation
  • Pulmonary Hypertension
  • Bronchopulmonary Dysplasia
  • Cystic Fibrosis
  • Rare Lung Diseases
  • Pediatric Pulmonary
  • Primary Ciliary Dyskinesia

Academic Appointments


Administrative Appointments


  • Director, The Stanford Cystic Fibrosis Center (2009 - Present)

Honors & Awards


  • Crandall Endowed Scholar in Pediatric Pulmonary Medicine, Stanford University School of Medicine (2007)
  • Annalisa Marzotto Endowed Chair in Cystic Fibrosis Care, University of Minnesota Medical School (2005)

Professional Education


  • Board Certification: Pediatric Pulmonary, American Board of Pediatrics (1996)
  • Medical Education:Universidad Peruana Cayetano Heredia (1986) Peru
  • Internship:SUNY at Brooklyn School Of Medicine (1990) NY
  • Residency:SUNY at Brooklyn School Of Medicine (1992) NY
  • Fellowship:University of Minnesota School of Medicine (1995) MN

Research & Scholarship

Current Research and Scholarly Interests


My research interests have centered on the inflammatory responses that lead to airway disease in Cystic Fibrosis (CF) and the metabolic factors that contribute to CF lung disease progression. Current efforts are focused on the understanding of the early events that drive the development of lung disease through the study of infants with CF identified by newborn screening. This includes the development of new diagnostic tools that permit the early detection of lung disease manifestations.

Clinical Trials


  • Rare Genetic Disorders of the Breathing Airways Recruiting

    Mucociliary clearance, in which mucus secretions are cleared from the breathing airways, is the primary defense mechanism for the lungs. Inhaled particles, including microbes that can cause infections, are normally entrapped in mucus on the airway surfaces and then cleared out by the coordinated action of tiny hair-like structures called cilia. Individuals with primary ciliary dyskinesia, variant cystic fibrosis, and pseudohypoaldosteronism have defective mucociliary clearance. The purpose of this study is to collect clinical and genetic information about these three airway diseases to improve current diagnostic procedures.

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  • Early Intervention in Cystic Fibrosis Exacerbation Recruiting

    Individuals with CF develop chronic lung infections and suffer intermittent acute exacerbations of their lung disease. Most exacerbations are not treated until they cause increased symptoms, and patients seek medical attention. This proposal details a study of home lung function and symptom monitoring. Subjects will be randomly assigned to one of two groups: 1) home monitoring, in which spirometry and symptoms are recorded; or 2) standard care. The home monitoring data will be transmitted electronically to the study center. If spirometry or symptoms have deteriorated substantially, treatment for a CF pulmonary exacerbation will be initiated. It is anticipated that use of home monitoring will lead to earlier, more reliable recognition and treatment of exacerbations, which will translate into better lung health.

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  • Study to Evaluate the Effect of KB001-A on Time-to-Need for Antibiotic Treatment Recruiting

    The purpose of this study is to confirm and extend the Phase 1-2 KB001 findings of an airway anti-inflammatory effect in CF individuals with chronic Pseudomonas aeruginosa (Pa) airway infection. It is hypothesized that steady-state levels of KB001-A in CF subjects with airway Pa infection will be safe and well-tolerated, and will increase the time-to-need for antibiotic treatment (IV, inhaled, or oral) for worsening of respiratory tract signs and symptoms compared with placebo.

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  • Long-term Study in US Cystic Fibrosis Patients Receiving Digestive Enzyme Supplements to Assess Any Narrowing of the Large Intestine Causing Adverse Intestinal Symptoms (Fibrosing Colonopathy) Recruiting

    This is a long-term study in cystic fibrosis patients who are participating in the Cystic Fibrosis Patient Registry to assess the occurrence and risk factors for a rare bowel disorder called fibrosing colonopathy (narrowing of the large intestine). Patients will be followed at their regular clinical care visits over a 10-year period and approached if they develop symptoms of fibrosing colonopathy for collection and use of further detailed information.

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Teaching

2013-14 Courses


Publications

Journal Articles


  • Standardizing nasal nitric oxide measurement as a test for primary ciliary dyskinesia. Annals of the American Thoracic Society Leigh, M. W., Hazucha, M. J., Chawla, K. K., Baker, B. R., Shapiro, A. J., Brown, D. E., LaVange, L. M., Horton, B. J., Qaqish, B., Carson, J. L., Davis, S. D., Dell, S. D., Ferkol, T. W., Atkinson, J. J., Olivier, K. N., Sagel, S. D., Rosenfeld, M., Milla, C., Lee, H., Krischer, J., Zariwala, M. A., Knowles, M. R. 2013; 10 (6): 574-581

    Abstract

    Several studies suggest that nasal nitric oxide (nNO) measurement could be a test for primary ciliary dyskinesia (PCD), but the procedure and interpretation have not been standardized.To use a standard protocol for measuring nNO to establish a disease-specific cutoff value at one site, and then validate at six other sites.At the lead site, nNO was prospectively measured in individuals later confirmed to have PCD by ciliary ultrastructural defects (n = 143) or DNAH11 mutations (n = 6); and in 78 healthy and 146 disease control subjects, including individuals with asthma (n = 37), cystic fibrosis (n = 77), and chronic obstructive pulmonary disease (n = 32). A disease-specific cutoff value was determined, using generalized estimating equations (GEEs). Six other sites prospectively measured nNO in 155 consecutive individuals enrolled for evaluation for possible PCD. Measurements and MainAt the lead site, nNO values in PCD (mean ± standard deviation, 20.7 ± 24.1 nl/min; range, 1.5-207.3 nl/min) only rarely overlapped with the nNO values of healthy control subjects (304.6 ± 118.8; 125.5-867.0 nl/min), asthma (267.8 ± 103.2; 125.0-589.7 nl/min), or chronic obstructive pulmonary disease (223.7 ± 87.1; 109.7-449.1 nl/min); however, there was overlap with cystic fibrosis (134.0 ± 73.5; 15.6-386.1 nl/min). The disease-specific nNO cutoff value was defined at 77 nl/minute (sensitivity, 0.98; specificity, >0.999). At six other sites, this cutoff identified 70 of the 71 (98.6%) participants with confirmed PCD.Using a standardized protocol in multicenter studies, nNO measurement accurately identifies individuals with PCD, and supports its usefulness as a test to support the clinical diagnosis of PCD.

    View details for DOI 10.1513/AnnalsATS.201305-110OC

    View details for PubMedID 24024753

  • Cystic fibrosis in the era of genomic medicine. Current opinion in pediatrics Milla, C. E. 2013; 25 (3): 323-328

    Abstract

    The field of cystic fibrosis (CF) is changing dramatically as the scientific knowledge accumulated since the cloning of the cystic fibrosis transmembrane conductance regulator (CFTR) gene is being translated into effective therapies to correct the basic defect and provide better disease models and in-depth understanding of the basic mechanisms of disease.This review focuses on three main aspects of the recent advances in the field: understanding the lung disease pathophysiology (in particular, the early events that condition its onset), better definition of the complex microbiology of the CF airway, and therapeutic developments. Although the most recently developed therapies, whether approved or under study, do not constitute a definitive cure, the benefit to patients is already becoming clearly apparent.As the field continues to change rapidly and new therapies are being identified, CF has become a paradigm for the application of concepts such as translational medicine, genomic medicine, and personalized care, with measurable clinical benefit for the patients affected by this disease.

    View details for DOI 10.1097/MOP.0b013e328360dbf5

    View details for PubMedID 23652683

  • Exome Sequencing Identifies Mutations in CCDC114 as a Cause of Primary Ciliary Dyskinesia AMERICAN JOURNAL OF HUMAN GENETICS Knowles, M. R., Leigh, M. W., Ostrowski, L. E., Huang, L., Carson, J. L., Hazucha, M. J., Yin, W., Berg, J. S., Davis, S. D., Dell, S. D., Ferkol, T. W., Rosenfeld, M., Sagel, S. D., Milla, C. E., Olivier, K. N., Turner, E. H., Lewis, A. P., Bamshad, M. J., Nickerson, D. A., Shendure, J., Zariwala, M. A. 2013; 92 (1): 99-106

    Abstract

    Primary ciliary dyskinesia (PCD) is a genetically heterogeneous, autosomal-recessive disorder, characterized by oto-sino-pulmonary disease and situs abnormalities. PCD-causing mutations have been identified in 14 genes, but they collectively account for only ~60% of all PCD. To identify mutations that cause PCD, we performed exome sequencing on six unrelated probands with ciliary outer dynein arm (ODA) defects. Mutations in CCDC114, an ortholog of the Chlamydomonas reinhardtii motility gene DCC2, were identified in a family with two affected siblings. Sanger sequencing of 67 additional individuals with PCD with ODA defects from 58 families revealed CCDC114 mutations in 4 individuals in 3 families. All 6 individuals with CCDC114 mutations had characteristic oto-sino-pulmonary disease, but none had situs abnormalities. In the remaining 5 individuals with PCD who underwent exome sequencing, we identified mutations in two genes (DNAI2, DNAH5) known to cause PCD, including an Ashkenazi Jewish founder mutation in DNAI2. These results revealed that mutations in CCDC114 are a cause of ciliary dysmotility and PCD and further demonstrate the utility of exome sequencing to identify genetic causes in heterogeneous recessive disorders.

    View details for DOI 10.1016/j.ajhg.2012.11.003

    View details for Web of Science ID 000313759000010

    View details for PubMedID 23261302

  • Novel CFTR Variants Identified during the First 3 Years of Cystic Fibrosis Newborn Screening in California. The Journal of molecular diagnostics : JMD Prach, L., Koepke, R., Kharrazi, M., Keiles, S., Salinas, D. B., Reyes, M. C., Pian, M., Opsimos, H., Otsuka, K. N., Hardy, K. A., Milla, C. E., Zirbes, J. M., Chipps, B., O'Bra, S., Saeed, M. M., Sudhakar, R., Lehto, S., Nielson, D., Shay, G. F., Seastrand, M., Jhawar, S., Nickerson, B., Landon, C., Thompson, A., Nussbaum, E., Chin, T., Wojtczak, H. 2013

    Abstract

    California uses a unique method to screen newborns for cystic fibrosis (CF) that includes gene scanning and DNA sequencing after only one California-40 cystic fibrosis transmembrane conductance regulator (CFTR) panel mutation has been identified in hypertrypsinogenemic specimens. Newborns found by sequencing to have one or more additional mutations or variants (including novel variants) in the CFTR gene are systematically followed, allowing for prospective assessment of the pathogenic potential of these variants. During the first 3 years of screening, 55 novel variants were identified. Six of these novel variants were discovered in five screen-negative participants and three were identified in multiple unrelated participants. Ten novel variants (c.2554_2555insT, p.F1107L, c.-152G>C, p.L323P, p.L32M, c.2883_2886dupGTCA, c.2349_2350insT, p.K114del, c.-602A>T, and c.2822delT) were associated with a CF phenotype (42% of participants were diagnosed at 4 to 25 months of age), whereas 26 were associated with CFTR-related metabolic syndrome to date. Associations with the remaining novel variants were confounded by the presence of other diseases or other mutations in cis or by inadequate follow-up. These findings have implications for how CF newborn screening and follow-up is conducted and will help guide which genotypes should, and which should not, be considered screen positive for CF in California and elsewhere.

    View details for PubMedID 23810505

  • Quantitative Analysis of the Human Airway Microbial Ecology Reveals a Pervasive Signature for Cystic Fibrosis SCIENCE TRANSLATIONAL MEDICINE Blainey, P. C., Milla, C. E., Cornfield, D. N., Quake, S. R. 2012; 4 (153)

    Abstract

    Cystic fibrosis (CF) is an autosomal recessive disease caused by mutations in the gene encoding the CF transmembrane conductance regulator. Disruption of electrolyte homeostasis at mucosal surfaces leads to severe lung, pancreatic, intestinal, hepatic, and reproductive abnormalities. Loss of lung function as a result of chronic lung disease is the primary cause of death from CF. Using high-throughput sequencing to survey microbes in the sputum of 16 CF patients and 9 control individuals, we identified diverse microbial communities in the healthy samples, contravening conventional wisdom that healthy airways are not significantly colonized. Comparing these communities with those from the CF patients revealed significant differences in microbial ecology, including differential representation of uncultivated phylotypes. Despite patient-specific differences, our analysis revealed a focal microbial profile characteristic of CF. The profile differentiated case and control groups even when classically recognized CF pathogens were excluded. As a control, lung explant tissues were also processed from a group of patients with pulmonary disease. The findings in lung tissue corroborated the presence of taxa identified in the sputum samples. Comparing the sequencing results with clinical data indicated that diminished microbial diversity is associated with severity of pulmonary inflammation within our adult CF cohort.

    View details for DOI 10.1126/scitranslmed.3004458

    View details for Web of Science ID 000309525600003

    View details for PubMedID 23019655

  • Effect of Endoscopic Sinus Surgery on Pulmonary Status of Adults with Cystic Fibrosis OTOLARYNGOLOGY-HEAD AND NECK SURGERY Kempainen, R. R., Sajan, J. A., Pylkas, A. M., Dunitz, J. M., Rimell, F. L., Milla, C. E. 2012; 147 (3): 557-562

    Abstract

    Functional endoscopic sinus surgery (FESS) provides symptomatic relief of sinus disease in patients with cystic fibrosis (CF), but it is unclear whether it has beneficial effects on lung disease in this population. This study assessed the effect of FESS on the respiratory status of adult patients with CF.Retrospective chart review.Tertiary medical center.Thirty-two adult patients with CF who underwent 45 operative cases.Clinical information retrieved for the 12-month periods preceding and following to determine the effect of FESS on the rate of decline in lung function, as well as intravenous antibiotic use and hospitalization for pulmonary exacerbation.The rate of decline in forced expiratory volume in 1 second and forced vital capacity was not significantly different in the 12 months before and after FESS. Functional endoscopic sinus surgery did not reduce days hospitalized or days on intravenous antibiotics for a respiratory exacerbation in the pre- vs postoperative period. Limiting the analysis to the 30 surgeries that were performed in patients with concomitant respiratory symptoms (ie, excluding the 15 surgeries performed for sinus symptoms alone) did not significantly alter the results. Covariates of importance in CF, including CFTR genotype, gender, or microbiology, did not affect the study results.These results did not demonstrate an effect of FESS on progression of lung disease in patients with CF, but further research is needed because low statistical power has made some of the negative findings inconclusive.

    View details for DOI 10.1177/0194599812444247

    View details for Web of Science ID 000314281300027

    View details for PubMedID 22517014

  • Pulmonary Complications of Endocrine and Metabolic Disorders PAEDIATRIC RESPIRATORY REVIEWS Milla, C. E., Zirbes, J. 2012; 13 (1): 23-28

    Abstract

    There are many important respiratory manifestations of endocrine and metabolic diseases in children. Acute and chronic pulmonary infections are the most common respiratory abnormalities in patients with diabetes mellitus, although cardiogenic and non-cardiogenic pulmonary oedema are also possible. Pseudohypoaldosteronism type 1 may be indistinguishable from cystic fibrosis (CF) unless serum aldosterone, plasma renin activity, and urinary electrolytes are measured and mutation analysis rules out CF. Hypo- and hyperthyroidism may alter lung function and affect the central respiratory drive. The thyroid hormone plays an essential role in lung development, surfactant synthesis, and lung defence. Complications of hypoparathyroidism are largely due to hypocalcaemia. Laryngospasm can lead to stridor and airway obstruction. Ovarian tumours, benign or malignant, may present with unilateral or bilateral pleural effusions. Metabolic storage disorders, primarily as a consequence of lysosomal dysfunction from enzymatic deficiencies, constitute a diverse group of rare conditions that can have profound effects on the respiratory system.

    View details for DOI 10.1016/j.prrv.2011.01.004

    View details for Web of Science ID 000299582300005

    View details for PubMedID 22208790

  • Diagnostic Yield of Nasal Scrape Biopsies in Primary Ciliary Dyskinesia: A Multicenter Experience PEDIATRIC PULMONOLOGY Olin, J. T., Burns, K., Carson, J. L., Metjian, H., Atkinson, J. J., Davis, S. D., Dell, S. D., Ferkol, T. W., Milla, C. E., Olivier, K. N., Rosenfeld, M., Baker, B., Leigh, M. W., Knowles, M. R., Sagel, S. D. 2011; 46 (5): 483-488

    View details for DOI 10.1002/ppul.21402

    View details for Web of Science ID 000289510500010

  • Diagnostic yield of nasal scrape biopsies in primary ciliary dyskinesia: A multicenter experience. Pediatric pulmonology Olin, J. T., Burns, K., Carson, J. L., Metjian, H., Atkinson, J. J., Davis, S. D., Dell, S. D., Ferkol, T. W., Milla, C. E., Olivier, K. N., Rosenfeld, M., Baker, B., Leigh, M. W., Knowles, M. R., Sagel, S. D. 2011

    Abstract

    Examination of ciliary ultrastructure remains the cornerstone diagnostic test for primary ciliary dyskinesia (PCD), a disease of abnormal ciliary structure and/or function. Obtaining a biopsy with sufficient interpretable cilia and producing quality transmission electron micrographs (TEM) is challenging. Methods for processing tissues for optimal preservation of axonemal structures are not standardized. This study describes our experience using a standard operating procedure (SOP) for collecting nasal scrape biopsies and processing TEMs in a centralized laboratory. We enrolled patients with suspected PCD at research sites of the Genetic Disorders of Mucociliary Clearance Consortium. Biopsies were performed according to a SOP whereby curettes were used to scrape the inferior surface of the inferior turbinate, with samples placed in fixative. Specimens were shipped to a central laboratory where TEMs were prepared and blindly reviewed. Four hundred forty-eight specimens were obtained from 107 young children (0-5 years), 189 older children (5-18 years), and 152 adults (> 18 years), and 88% were adequate for formal interpretation. The proportion of adequate specimens was higher in adults than in children. Fifty percent of the adequate TEMs showed normal ciliary ultrastructure, 39% showed hallmark ultrastructural changes of PCD, and 11% had indeterminate findings. Among specimens without clearly normal ultrastructure, 72% had defects of the outer and/or inner dynein arms (IDA), while 7% had central apparatus defects with or without IDA defects. In summary, nasal scrape biopsies can be performed in the outpatient setting and yield interpretable samples, when performed by individuals with adequate training and experience according to an SOP. Pediatr. Pulmonol. © 2010 Wiley-Liss, Inc.

    View details for PubMedID 21284095

  • Characteristics of gastroesophageal reflux in adults with cystic fibrosis JOURNAL OF CYSTIC FIBROSIS Sabati, A. A., Kempainen, R. R., Milla, C. E., Ireland, M., Schwarzenberg, S. J., Dunitz, J. M., Khan, K. M. 2010; 9 (5): 365-370

    Abstract

    Gastroesophageal reflux (GER) in adults with cystic fibrosis (CF) is poorly characterized. This study examines the frequency and predictors of GER symptoms and their relationship to lung function in adults with CF.Cross-sectional study of adults at the University of Minnesota CF Clinic using two validated self report surveys: The Mayo GER questionnaire and the GERD Symptom Assessment Scale (GSAS).Of 274 invited patients, 201 (73%) completed the surveys and 173 performed spirometry at the same visit. Frequent symptoms (at least weekly) were reported by 24% of the patients and an additional 39% experienced occasional symptoms. Heartburn, acid regurgitation and dysphagia were the most common symptoms and 18% reported that GER symptoms worsened their respiratory condition. Females and patients reporting weight loss had more symptoms (mean GSAS symptom score 4.9 vs. 4.0, p=0.025 and 5.3 vs. 4.2, p=0.04) and more severe symptoms (mean GSAS distress score 5.6 vs. 3.8, p=0.005 and 6.8 vs. 4.0, p=0.01) compared to males and those who did not report weight loss. Patients on acid suppression (n=122, 61%) continued to report heartburn (n=80, 66%) and acid regurgitation (n=47, 23%). GER symptoms and severity of symptoms were not predictive of FEV(1) or FVC.GER symptoms were present in a majority of patients. Females and patients with weight loss require special attention to their GER symptoms. Many patients on acid suppression continued to be report symptoms.

    View details for DOI 10.1016/j.jcf.2010.06.004

    View details for Web of Science ID 000283411500011

    View details for PubMedID 20674518

  • Pre-transplant risk factors affecting outcome in Hurler syndrome BONE MARROW TRANSPLANTATION Orchard, P. J., Milla, C., Braunlin, E., DeFor, T., Bjoraker, K., Blazar, B. R., Peters, C., Wagner, J., Tolar, J. 2010; 45 (7): 1239-1246

    Abstract

    Allogeneic transplantation remains the standard of care for patients with Hurler syndrome. As enzyme replacement therapy (ERT) has become available, controversy has emerged in regards to whether the use of enzyme in the peri-transplant period is appropriate. An analysis was performed on 74 patients with Hurler syndrome transplanted at the University of Minnesota between 1990 and 2003, before our use of ERT associated with transplant, with the intention of determining if patients at higher risk during the transplant can be identified based on evaluations and events before transplantation. Age, the presence of hydrocephalus, a history of cardiovascular issues or upper airway obstruction before transplant was not associated with significant differences in survival. In contrast, patients who had a history of lower airway disease, including reactive airway disease or bronchiolitis, or a history of pneumonia, had a significantly inferior outcome based on OS. The risk for serious respiratory complications was also assessed by evaluating the incidence of intubation. Overall, 31% of these patients were intubated. The risk of intubation was higher in older patients and in those with a history of lower airway disease. These findings have implications for the care of patients with high-risk features.

    View details for DOI 10.1038/bmt.2009.319

    View details for Web of Science ID 000279614900016

    View details for PubMedID 19898501

  • Comparison of Settings Used for High-Frequency Chest-Wall Compression in Cystic Fibrosis RESPIRATORY CARE Kempainen, R. R., Milla, C., Dunitz, J., Savik, K., Hazelwood, A., Williams, C., Rubin, B. K., Billings, J. L. 2010; 55 (6): 695-701

    Abstract

    Cystic fibrosis (CF) patients commonly use a high-frequency chest-wall compression (HFCWC) device for airway clearance that generates oscillatory flow with a sine-wave configuration. Typical HFCWC settings combine a lower Vest inflation pressure setting (eg, 5 on the Vest's arbitrary 1-10 scale for the setting that controls the background pressure of the inflatable vest) with mid-range frequency (14-16 Hz) (lower-pressure/mid-frequency HFCWC).To determine whether HFCWC with higher pressure settings (6-10 on the Hill-Rom Vest's arbitrary 1-10 scale) combined with variable mid-frequencies (8, 9, and 10 Hz, plus 18, 19, and 20 Hz) (higher-pressure/variable-frequency HFCWC) results in greater sputum expectoration than lower-pressure/mid-frequency HFCWC.This was a controlled randomized crossover study. Sixteen clinically stable, adult CF patients participated. Patients performed airway clearance with HFCWC, once each with lower-pressure/mid-frequency HFCWC and higher-pressure/variable-frequency HFCWC, on separate occasions. All sputum produced during each session was collected. Patients completed pulmonary function tests before and after each session.Median sputum wet weight was greater with higher-pressure/variable-frequency HFCWC than with lower-pressure/mid-frequency HFCWC (6.4 g, range 0.49-22.0 g, versus 4.8 g, range 0.24-15.0 g, P = .02). Dry sputum weight differences did not reach statistical significance (higher-pressure/variable-frequency HFCWC 0.20 g, range 0.009-0.62 g, lower-pressure/mid-frequency HFCWC 0.12 g, range 0.0001-1.0 g, P = .23). Higher-pressure/variable-frequency HFCWC and lower-pressure/mid-frequency HFCWC resulted in similar increases in FEV(1) (70 mL vs 90 mL, P = .21) and forced vital capacity (80 mL vs 80 mL, P = .94). Post-therapy sputum viscoelastic properties did not differ. Patients perceived the 2 regimens as equally comfortable and effective (P = .35 and P = .35, respectively).In adult CF patients, single-session higher-pressure/variable-frequency HFCWC resulted in greater sputum expectoration by wet weight, but not other differences, compared to the commonly used lower-pressure/mid-frequency settings. Longer-term comparisons are needed in a larger, more diverse population to determine whether sustained use of the higher-pressure/variable-frequency settings results in clinically important differences in outcomes.

    View details for Web of Science ID 000279232200003

    View details for PubMedID 20507651

  • Nutrition in Cystic Fibrosis SEMINARS IN RESPIRATORY AND CRITICAL CARE MEDICINE Matel, J. L., Milla, C. E. 2009; 30 (5): 579-586

    Abstract

    Cystic fibrosis (CF) is mostly recognized for its pulmonary morbidity, but the earliest manifestations of the disease are related to its gastrointestinal and nutritional derangements. Destruction of acinar pancreatic tissue, pancreatic ductular obstruction, and lack of enzymatic activity lead to malabsorption (particularly of fats), diarrhea, and failure to thrive. A minority of CF patients carrying milder CF transmembrane conductance regulator (CFTR) mutations have preserved pancreatic secretory activity and are free from significant malabsorption early in life. However, these patients are at risk for losing pancreatic function over time. Nutritional status plays an important role in the progression of the pulmonary disease in CF. Further, CF patients with better nutritional status have a survival advantage. Several factors contribute to impaired nutritional status in CF (e.g., pancreatic insufficiency, chronic malabsorption, recurrent sinopulmonary infections, chronic inflammation, increased energy expenditure, suboptimal intake). Progressive lung disease further increases calorie requirements by increasing the work of breathing. Treatment programs that place an emphasis on higher caloric intake and more aggressive nutritional management in CF patients report better outcomes. Basic tenets of nutritional repletion in CF include the use of pancreatic enzyme replacement therapy and following a high calorie, high protein, unrestricted diet. At the Stanford Cystic Fibrosis Center, nutritional status is assessed on an ongoing basis through anthropometric parameters and annual assessment of body composition, bone density, glucose tolerance, and various biochemical and micronutrient levels. Based on the anthropometric data obtained on routine clinical encounters, patients are categorized as to their nutritional risk. This proactive approach for the early identification of nutritional risk has become a major theme within the network of US CF centers. Aggressive nutritional support with adequate pancreatic replacement management should lead to both normal growth and lung function preservation. In addition, nutritional status has to be monitored closely during routine encounters to allow for early intervention once derangements are noted. This will include increasing calories in the early stages of lung disease and being vigilant of gastrointestinal symptomatology and complications.

    View details for DOI 10.1055/s-0029-1238916

    View details for Web of Science ID 000270175900009

    View details for PubMedID 19760545

  • Cystic fibrosis related diabetes PAEDIATRIC RESPIRATORY REVIEWS Zirbes, J., Milla, C. E. 2009; 10 (3): 118-123

    Abstract

    Diabetes is a frequent complication seen in cystic fibrosis patients as they reach adulthood. Cystic fibrosis related diabetes (CFRD) is distinguished as a separate entity with features that include progressive loss of islet beta cell mass and insulin deficiency, as well as insulin resistance. Abnormalities in glucose tolerance may be detectable for many years prior to the development of overt diabetes. Therefore oral glucose tolerance testing is the preferred screening method for the identification of those patients at the highest risk for progression to diabetes. Progression to diabetes has been linked to poor outcomes in CF including loss of pulmonary function and increased mortality among females. Given the role that insulin deficiency plays in CFRD, insulin replacement therapy remains the only recommended intervention. In the absence of definitive supportive data, the use of oral antidiabetic agents is not considered standard therapy and needs further study. As with other forms of diabetes, CFRD patients also experience microvascular complications and should be periodically evaluated for manifestations.

    View details for DOI 10.1016/j.prrv.2009.04.004

    View details for Web of Science ID 000279268600007

    View details for PubMedID 19651382

  • Longitudinal Assessment of Lung Function From Infancy to Childhood in Patients With Cystic Fibrosis PEDIATRIC PULMONOLOGY Harrison, A. N., Regelmann, W. E., Zirbes, J. M., Milla, C. E. 2009; 44 (4): 330-339

    Abstract

    Infant pulmonary function testing (IPFT) has become an important clinical tool for the evaluation of lung function in infants with Cystic Fibrosis (CF); however, it is still unclear whether lung function in infancy is predictive of lung function later in life. We hypothesized that measures of airflow obstruction by IPFT would correlate strongly with lung function by conventional spirometry later in childhood. STUDY DESIGN AND METHODOLOGY: A retrospective analysis was performed of all CF infants studied with IPFT at the University of Minnesota Children's Hospital between September 1994 and March 2003. A total of 41 patients underwent IPFT and had valid spirometry results available at age 6 or later. IPFT values, such as I:E ratio, respiratory rate, tidal volume, and T(ptef)/T(e), were calculated from tidal breathing loops. Passive respiratory system mechanics, which included C(rs), R(rs), and tau(rs), were measured by the single breath end-inspiratory occlusion technique. Forced expiratory flows, including V(max)FRC, FVC, FEF(50), and FEF(75), were obtained by rapid thoracic compression and included a full vital capacity maneuver by the multiple inflation method. FRC measurements were calculated from data obtained via nitrogen washout in a subset of patients. In addition, information on age at diagnosis and results of oropharyngeal (OP) cultures at diagnosis and on subsequent visits was recorded. Standard spirometry was performed in all patients starting at age 5. The first valid flow-volume loop after age six was selected for analysis.Significant correlations were observed for the R(rs) and the FEF(50) by IPFT and the FEV(1) and the FEF(25-75) by standard spirometry (r > 0.4 and P < 0.03 for all correlations). These correlations were the strongest for those IPFT measurements obtained within 1 month of diagnosis and when R(rs) was expressed as sG(rs). The correlations observed were independent of the effects of age at diagnosis, gender and presence of Pseudomonas in oropharyngeal cultures at the time of diagnosis. Mean R(rs) declined from 0.050 to 0.027 cm H(2)O/ml/sec with treatment (P < 0.0001). There were no other significant associations found between other IPFT values measured and FEV(1) by spirometry.Measures of airflow obstruction on IPFT, specifically R(rs), sG(rs), and FEF(50), were strongly correlated with future lung function. IPFT measurement of R(rs) in addition to forced expiratory flows may help select patients at the greatest risk of early lung function decline. This study supports the use of R(rs) as a surrogate variable to help assess the impact of early therapies in CF.

    View details for DOI 10.1002/ppul.20994

    View details for Web of Science ID 000264965400005

    View details for PubMedID 19274621

  • Associations of Psychosocial Factors With Health Outcomes Among Youth With Cystic Fibrosis PEDIATRIC PULMONOLOGY Patterson, J. M., Wall, M., Berge, J., Milla, C. 2009; 44 (1): 46-53

    Abstract

    The purpose of this study was to examine the relationship of strains, resources, feelings, and behaviors about treatment adherence reported by youth with cystic fibrosis (CF) with repeated clinic measures of their pulmonary function and nutritional status.Linear mixed models, stratified by gender, adjusting for age, were used to examine the effects of strains, resources, and adherence behaviors on repeated pulmonary function and nutritional status measures. All 10-21 years old with CF at the Minnesota Cystic Fibrosis Center were invited by mail to participate. Of these 177 youth, 51% (43 boys, 47 girls) returned surveys. Forced expiratory volume in 1 sec and predicted weight-for-height were extracted from participants' clinic records for the 18 months following receipt of the survey.Females showed significantly greater variability in repeated measures of pulmonary function and nutritional status compared to males. Parent-youth strains, physical strains, activity limitations, and cough suppression had significant effects on the 18-month mean of pulmonary function measures for females, but only physical strains had a significant effect for males.Compared to males, females experienced more strains and poorer treatment adherence, which may be factors associated with declines in pulmonary function observed among females with CF during the adolescent years.

    View details for DOI 10.1002/ppul.20925

    View details for Web of Science ID 000262386100006

    View details for PubMedID 19085923

  • Steroid-sparing effect of Omalizumab for allergic bronchopulmonary aspergillosis and cystic fibrosis PEDIATRIC PULMONOLOGY Zirbes, J. M., Milla, C. E. 2008; 43 (6): 607-610

    Abstract

    Allergic bronchopulmonary aspergillosis (ABPA) is a complication commonly encountered in patients with CF that produces significant respiratory morbidity. Chronic airway colonization with Aspergillus induces strong inflammatory responses with high IgE levels. Current guidelines for therapy include prolonged courses of systemic corticosteroids as the main therapeutic strategy. However this has the potential to induce significant detrimental side effects in children. Omalizumab is a humanized monoclonal antibody directed against IgE that prevents its binding to high- and low-affinity receptors on effector cells. It has been shown to be effective in improving asthma control in patients with a strong allergic component. We present our long term experience with the use of Anti-IgE therapy in three children with CF and ABPA (mean age at start of therapy 14.2 years) who were steroid dependent. All three were already experiencing significant side effects from chronic steroid therapy. After the start of Omalizumab these children have experienced significant and sustained clinical improvements at the same time that they were discontinued from chronic systemic steroids. Our experience suggests that IgE blockade has tremendous potential as a strategy to control this disease in steroid dependent patients.

    View details for DOI 10.1002/ppul.20804

    View details for Web of Science ID 000256744200012

    View details for PubMedID 18433040

  • Gender differences in treatment adherence among youth with cystic fibrosis: Development of a new questionnaire JOURNAL OF CYSTIC FIBROSIS Patterson, J. M., Wall, M., Berge, J., Milla, C. 2008; 7 (2): 154-164

    Abstract

    Some prior studies have reported that girls with cystic fibrosis (CF) experience higher morbidity and mortality compared to boys. In this study, the authors compared boys' and girls' perceptions of disease-related strains and resources associated with living with CF, and the relationship of these factors to CF treatment feelings and behaviors.All 10-21 year olds with CF at the Minnesota Cystic Fibrosis Center were invited by mail to complete a new self-report survey (Living with CF Questionnaire--LCFQ). Of these 177 youth, 58% (49 boys and 54 girls) returned surveys.Exploratory and confirmatory factor analyses revealed nine factors in the LCFQ. Partial support was found for hypothesized gender differences in these factors. Compared to boys, girls reported significantly more illness-related strains and worries, including emotional strains, greater treatment discouragement, lower self-esteem, and lower adherence to some aspects of the CF treatment regimen (coughing, eating high-fat foods, taking meds/pills).Living with CF appears to have a greater emotional impact on adolescent girls compared to boys. These gender differences may contribute to the poorer pulmonary function observed among girls with cystic fibrosis during the adolescent years.

    View details for DOI 10.1016/j.jcf.2007.07.008

    View details for Web of Science ID 000255299400011

    View details for PubMedID 17719857

  • Comparison of high-frequency chest wall oscillation with differing waveforms for airway clearance in cystic fibrosis CHEST Kempainen, R. R., Williams, C. B., Hazelwood, A., Rubin, B. K., Milla, C. E. 2007; 132 (4): 1227-1232

    Abstract

    High-frequency chest wall oscillation (HFCWO) is commonly used by cystic fibrosis (CF) patients for airway clearance. The primary objective of this study was to determine whether the use of a newer HFCWO device that generates oscillations with a triangular waveform results in greater sputum production than a commonly used device that generates oscillations with a sine waveform.This was a controlled, randomized, double-blind, crossover study. Fifteen clinically stable, adult CF patients participated. Patients performed airway clearance with each device once and at matched oscillation frequencies and pressures. All sputum produced during each session was collected. Patients completed pulmonary function tests before and after each session, and rated the comfort of the two devices.Mean sputum wet and dry weight produced during sine waveform and triangular waveform HFCWO sessions did not differ (p = 0.11 and p = 0.2, respectively). Mean changes in FEV(1) and FVC following HFCWO therapy were also comparable (p = 0.21 and p = 0.56, respectively). However, there was a significant reduction in air trapping by residual volume/total lung capacity ratio following triangular waveform HFCWO (p = 0.01). In addition, in vitro cough transportability was 10.6% greater following therapy with the triangular waveform device (p = 0.05). Patients perceived the two devices as equally comfortable (p = 0.8).Single-session sputum production is comparable with sine and triangular waveform HFCWO devices. Longer term comparisons are needed to determine whether sustained use of the devices results in clinically important differences in outcomes.

    View details for DOI 10.1378/chest.07-1078

    View details for Web of Science ID 000250254000022

    View details for PubMedID 17890465

  • Hepatolithiasis and Cholangiocarcinoma in cystic fibrosis: A case series and review of the literature DIGESTIVE DISEASES AND SCIENCES Perdue, D. G., Cass, O. W., Milla, C., Dunitz, J., Jessurun, J., Sharp, H. L., Schwarzenberg, S. J. 2007; 52 (10): 2638-2642

    View details for DOI 10.1007/s10620-006-9259-1

    View details for Web of Science ID 000249300100027

    View details for PubMedID 17443409

  • Repeated aerosolized AAV-CFTR for treatment of cystic fibrosis: A Randomized placebo-controlled phase 2B trial HUMAN GENE THERAPY Moss, R. B., Milla, C., Colombo, J., Accurso, F., Zeitlin, P. L., Clancy, J. P., Spencer, L. T., Pilewski, J., Waltz, D. A., Dorkin, H. L., Ferkol, T., Pian, M., Ramsey, B., Carter, B. J., Martin, D. B., Heald, A. E. 2007; 18 (8): 726-732

    Abstract

    Previous studies have demonstrated that delivery of a recombinant adeno-associated virus (AAV) vector encoding the complete human cystic fibrosis transmembrane regulator (CFTR) cDNA (tgAAVCF) to the nose, sinus, and lungs of subjects with cystic fibrosis (CF) was safe and well tolerated. In a small randomized, double-blind study of three doses of aerosolized tgAAVCF or placebo at 30-day intervals, encouraging but non-significant trends in pulmonary function and induced sputum interleukin 8 (IL-8) levels were seen at early time points. This larger study was conducted to verify these trends. One hundred and two subjects aged 12 years and older with mild-to-moderate cystic fibrosis (forced expiratory flow in 1 sec [FEV1]:60% predicted) were randomized to two aerosolized doses of 1x10(13)DNase-resistant particles of tgAAVCF (n=51) or matching placebo (n=51) administered 30 days apart. Although tgAAVCF was well tolerated, the study did not meet its primary efficacy end point of statistically significant improvement in FEV1 30 days after initial administration of tgAAVCF compared with placebo. There were no significant differences in spirometric lung function over time, induced sputum biologic markers, or days of antibiotic use in either treatment group. Thus repeated doses of aerosolized tgAAVCF were safe and well tolerated, but did not result in significant improvement in lung function over time. Because gene transfer is the simplest, most basic way to correct the underlying genetic defect that leads to disease in CF, further research is warranted to develop an effective gene transfer agent for the treatment of CF.

    View details for DOI 10.1089/hum.2007.022

    View details for Web of Science ID 000249124900005

    View details for PubMedID 17685853

  • Nutrition and lung disease in cystic fibrosis CLINICS IN CHEST MEDICINE Milla, C. E. 2007; 28 (2): 319-?

    Abstract

    Among patients who have cystic fibrosis (CF), lung disease is a significant contributor to morbidity. From a clinical perspective, the link between malnutrition and lung dysfunction in CF is well established; however, the causal relationship remains unclear. Nutritional intervention for CF patients is predicated on the hypothesis that improved nutritional status improves pulmonary function. Which interventions will be of most value and have sustained gains is not completely clear from the available data. Taking into account that several factors condition the deficits that lead to malnutrition in CF, multidisciplinary interventions are likely to give the best results. More research is needed to better dissect the nutritional factors involved in lung disease and to identify effective and safe interventions through systematic controlled trials.

    View details for DOI 10.1016/j.ccm.2007.02.006

    View details for Web of Science ID 000246780300007

    View details for PubMedID 17467551

  • Microvascular complications in cystic fibrosis-related diabetes DIABETES CARE Schwarzenberg, S. J., Walk, D., Thomas, W., Milla, C., Olsen, T. W., Moran, A., Grover, T. 2007; 30 (5): 1056-1061

    Abstract

    The incidence of cystic fibrosis-related diabetes (CFRD) and the prevalence of diabetic microvascular complications were determined at the University of Minnesota.Cystic fibrosis patients have undergone annual oral glucose tolerance testing since 1990. Database review was performed to determine diabetes duration and the results of annual urine albumin-to-creatinine ratio (U(alb:Cr)) screening and dilated retinal exams. In addition, 59 individuals underwent detailed retinopathy, nephropathy, neuropathy, and gastroenteropathy screening.During 1990-2005, 775 patients aged > or = 6 years were followed. CFRD was diagnosed by an oral glucose tolerance test or fasting hyperglycemia in 285 subjects (52% female), 64% of whom had fasting hyperglycemia. Most patients with CFRD without fasting hyperglycemia progressed to CFRD with fasting hyperglycemia over time. No subject with CFRD without fasting hyperglycemia had retinopathy or abnormal U(alb:Cr). In CFRD subjects with fasting hyperglycemia and diabetes for > or = 10 years, 14% had microalbuminuria and 16% had retinopathy. Autonomic neuropathy and gastrointestinal symptoms each were seen in 52% and somatic abnormalities in 22% of patients with or without fasting hyperglycemia.Diabetic microvascular complications occur in CFRD, although the prevalence of retinopathy and nephropathy appears to be less than that found in other forms of diabetes. Annual complication screening should occur after known diabetes duration of 5 years in patients with CFRD with fasting hyperglycemia.

    View details for DOI 10.2337/dc06-1576

    View details for Web of Science ID 000246291400004

    View details for PubMedID 17322485

  • Microbiology, safety, and pharmacokinetics of aztreonam lysinate for inhalation in patients with cystic fibrosis PEDIATRIC PULMONOLOGY Gibson, R. L., Retsch-Bogart, G. Z., Oermann, C., Milla, C., Pilewski, J., Daines, C., Ahrens, R., Leon, K., Cohen, M., McNamara, S., Callahan, T. L., Markus, R., Burns, J. L. 2006; 41 (7): 656-665

    Abstract

    Aztreonam lysinate for inhalation (AI) is a novel monobactam formulation being investigated for pulmonary Pseudomonas aeruginosa infections in patients with cystic fibrosis (CF).Pre-clinical studies investigated the pre- and post-nebulization activity of AI and its activity in the presence of CF sputum. A double-blind, placebo-controlled, dose-escalation trial determined pharmacokinetics and tolerability of AI in subjects with CF. Single daily escalating doses of AI 75, 150, or 225 mg, or placebo were self-administered using an eFlow Electronic Nebulizer. Sputum samples were collected up to 4 hr and blood samples up to 8 hr post-dose.AI activity against multiple CF isolates was retained after nebulization via eFlow, and activity was not inhibited by CF sputum. All 12 adult subjects and 11/12 adolescents tolerated all AI doses. One patient had an asymptomatic FEV1 decrease > 20% with the 150 mg dose. Median aztreonam sputum concentrations in adults 10 min after AI 75, 150, and 225 mg were 383, 879, and 985 microg/g, respectively. Median sputum concentrations in adolescents 10 min after AI 75, 150, and 225 mg were 324, 387, and 260 microg/g, respectively. Systemic exposure to AI was low. Plasma pharmacokinetics in adults receiving AI 75 mg were Cmax = 419 ng/g, Tmax = 0.99 hr, t1/2 = 2.1 hr. Aztreonam concentrations in sputum were at or above the MIC50 for at least 4 hr post-dose.These data support the continued development of AI for treatment of pulmonary infections in patients with CF.

    View details for DOI 10.1002/ppul.20429

    View details for Web of Science ID 000238663200009

    View details for PubMedID 16703579

  • Different frequencies should be prescribed for different high frequency chest compression machines. Biomedical instrumentation & technology Milla, C. E., Hansen, L. G., Warwick, W. J. 2006; 40 (4): 319-324

    Abstract

    High frequency chest compression (HFCC) is used for treatment and prevention of the lung diseases characterized by impaired mucus clearance and/or cough, where patients are at risk for acquiring acute bronchitis or pneumonia. The HFCC treatment frequencies may be prescribed according to the manufacturers' generic guidelines or may be determined for each individual patient by a "tuning" method that measures, at the mouth, the air volume displacement and the associated airflows produced at each frequency. Tuning is performed while the patient is breathing normally during the HFCC system operation. After measurements for several breaths at one frequency have been collected, the program randomly selects and measures another frequency until the entire frequency range of the machine being tuned has been sampled. Frequencies range from 6 to 21 Hz for the sine waveform machines and from 6 to 25 Hz for the square waveform machines. Each group of flow signals is digitized and analyzed by the program. For each frequency, the HFCC flow velocities and volumes are computed and averaged. These average flows and volumes are rank ordered; the three frequencies with the highest flows and the three frequencies producing the largest volumes are selected for prescription. If the same frequency is selected as one of the three best frequencies for both flow and volume, the next ranked frequency is selected randomly for flow or volume. Significant differences exist between patients and HFCC machines. In a series of 100 cystic fibrosis (CF) patients with varying degrees of lung disease, we found that the best-ranked frequencies varied from patient to patient and did not correlate with patients' age, gender, height, weight, or spirometry parameters. With the sine waveform, the highest HFCC airflows were between 13 and 20 Hz 82% of the time and the largest HFCC volumes were between 6 and 10 Hz 83% of the time. With the square waveform, both the highest average HFCC flow rates and the largest volume average HFCC displacements were between 6 and 14 Hz. Nevertheless, in this sample of 100 consecutive tunings, every frequency from 6 and 20 Hz was a best frequency for at least one patient. These findings provide the basis for recommending a tuning protocol to be used for prescribing frequencies with the various HFCC machines, because they are different from one another. If a patient's tuning cannot be done, it may be useful to prescribe the best frequencies based on the waveform machine he or she uses.

    View details for PubMedID 16941931

  • Inflammatory cytokines and the development of pulmonary complications after allogeneic hematopoietic cell transplantation in patients with inherited metabolic storage disorders BIOLOGY OF BLOOD AND MARROW TRANSPLANTATION Kbarbanda, S., Panoskaltsis-Mortari, A., Haddad, I. Y., Blazar, B. R., Orchard, P. J., Cornfield, D. N., Grewal, S. S., Peters, C., Regelmann, W. E., Milla, C. E., Baker, K. S. 2006; 12 (4): 430-437

    Abstract

    Patients with inherited metabolic storage disorders are at a higher risk of developing pulmonary complications after hematopoietic cell transplantation (HCT). This single-center prospective study of 48 consecutive inherited metabolic storage disorder patients was performed to identify risk factors for the development of pulmonary complications after HCT. Before HCT, subjects underwent bronchoalveolar lavage (BAL) for cell count, culture, nitrite levels, and analysis of proinflammatory cytokines and chemokines. The overall incidence of pulmonary complications was 52% (infectious, 23%; noninfectious, 29%) over a period of 4 years. Diffuse alveolar hemorrhage was the most frequent noninfectious complication and occurred in 19% of patients, all of whom had a diagnosis of mucopolysaccharidosis (Hurler and Maroteaux-Lamy syndromes). Levels of interleukin (IL)-1beta, IL-6, IL-8, tumor necrosis factor alpha, macrophage inflammatory protein 1alpha, and granulocyte colony-stimulating factor in BAL fluid samples obtained before HCT were higher in patients with mucopolysaccharidoses than in patients with leukodystrophies. In addition, levels of IL-1beta, IL-6, IL-8, and granulocyte colony-stimulating factor were increased in the BAL fluid of patients who developed noninfectious pulmonary complications compared with those who did not develop pulmonary complications. It is interesting to note that most noninfectious pulmonary complications occurred in patients with mucopolysaccharidoses, especially diffuse alveolar hemorrhage, which occurred exclusively in patients with mucopolysaccharidoses. Higher levels of bronchial proinflammatory cytokines and chemokines may be predictive of the development of subsequent posttransplantation noninfectious complications in patients with mucopolysaccharidoses, especially those with Hurler syndrome. Larger studies will be required to further elucidate etiologic mechanisms and predictive factors.

    View details for DOI 10.1016/j.bbmt.2005.12.026

    View details for Web of Science ID 000236494600006

    View details for PubMedID 16545727

  • Cystic fibrosis pulmonary exacerbations JOURNAL OF PEDIATRICS Ferkol, T., Rosenfeld, M., Milla, C. E. 2006; 148 (2): 259-264

    View details for DOI 10.1016/j.jpeds.2005.10.019

    View details for Web of Science ID 000235929600025

    View details for PubMedID 16492439

  • Diabetes is associated with dramatically decreased survival in female but not male subjects with cystic fibrosis DIABETES CARE Milla, C. E., Billings, J., Moran, A. 2005; 28 (9): 2141-2144

    Abstract

    Survival analysis was performed on a prospectively followed cohort of patients with cystic fibrosis (CF) to determine the impact of the development of diabetes on survival.Clinical data were retrieved for patients diagnosed with CF-related diabetes (CFRD) at the Minnesota CF Center in 1987-2002. Kaplan-Meier survival analysis was performed to estimate median survival. Data were analyzed by Cox regression to evaluate the influence of clinical characteristics at the time of CFRD diagnosis on mortality.Clinical information was reviewed from 1,081 CF patients. A total of 123 patients with CFRD with fasting hyperglycemia were identified (58 males). Median survival was 49.5 years for male subjects without diabetes, 47.4 years for male subjects with diabetes, 47.0 years for female subjects without diabetes, and 30.7 years for female subjects with diabetes. Only female sex and forced expiratory volume in 1 s at the time of CFRD diagnosis were significant predictors of the subsequent risk of death (P < 0.001). This strong association was not confounded by CFTR genotype, BMI, steroid use, respiratory pathogens, HbA1c, or pregnancy.Female subjects with CFRD have a remarkably poorer prognosis compared with all male subjects with CF and female subjects with CF but without diabetes. The etiology of this sex difference is not clear. We speculate it might involve the interaction of female hormones and diabetes on promotion of a proinflammatory state or that androgens might protect male subjects from the catabolic effects of insulin deficiency. Alternatively, the appearance of frank diabetes in female subjects with CF may simply be a marker for some other biological difference that is not immediately apparent.

    View details for Web of Science ID 000231525700009

    View details for PubMedID 16123480

  • Absence of host tumor necrosis factor receptor 1 attenuates manifestations of idiopathic pneumonia syndrome AMERICAN JOURNAL OF PHYSIOLOGY-LUNG CELLULAR AND MOLECULAR PHYSIOLOGY Shukla, M., Yang, S. X., Milla, C., Panoskaltsis-Mortari, A., Blazar, B. R., Haddad, I. Y. 2005; 288 (5): L942-L949

    Abstract

    The interaction of TNF-alpha with TNF receptor 1 (TNFR1) activates several signal transduction pathways that lead to apoptosis or NF-kappa B-dependent inflammation and immunity. We hypothesized that host TNFR1 expression contributes to noninfectious lung injury and inflammation commonly observed after bone marrow transplantation (BMT), termed idiopathic pneumonia syndrome (IPS). C57BL/6 TNFR1-sufficient (TNFR1(+/+)) and -deficient (TNFR1(-/-)) mice were total body irradiated with or without cyclophosphamide conditioning and were given bone marrow plus IPS-inducing donor spleen T cells from B10.BR wild-type mice. TNFR1(-/-) recipient mice exhibited improved early post-BMT survival associated with decreased permeability edema. In addition, the low lung compliance measured in anesthetized, ventilated TNFR1(+/+) mice on day 7 after BMT was restored to baseline during TNFR1 deficiency. Importantly, bronchoalveolar lavage fluid (BALF) inflammatory cells from TNFR1(-/-) vs. TNFR1(+/+) mice generated less nitric oxide (.NO) and nitrating species and exhibited suppressed programmed cell death as assessed using flow cytometry. However, cellular infiltration and levels of proinflammatory cytokines and chemokines were generally higher in BALF collected on day 7 after BMT from TNFR1(-/-) compared with TNFR1(+/+) recipient mice. Our results support a major role of host TNFR1 in regulation of .NO production and lung dysfunction after allogeneic BMT.

    View details for DOI 10.1152/ajplung.00260.2004

    View details for Web of Science ID 000228265300022

    View details for PubMedID 15608149

  • Safety and tolerability of denufosol tetrasodium inhalation solution, a novel P2Y(2) receptor agonist: Results of a phase 1/phase 2 multicenter study in mild to moderate cystic fibrosis PEDIATRIC PULMONOLOGY Deterding, R., Retsch-Bogart, G., Milgram, L., Gibson, R., Daines, C., Zeitlin, P. L., Milla, C., Marshall, B., LaVange, L., Engels, J., Mathews, D., Gorden, J., Schaberg, A., Williams, J., Ramsey, B. 2005; 39 (4): 339-348

    Abstract

    Denufosol tetrasodium (INS37217) is a selective P2Y(2) agonist that stimulates ciliary beat frequency and Cl(-) secretion in normal and cystic fibrosis (CF) airway epithelia, and is being investigated as an inhaled treatment for CF. The Cl(-) secretory response is mediated via a non-CFTR pathway, and the driving force for Cl(-) secretion is enhanced by the effect of P2Y(2) activation to also inhibit epithelial Na(+) transport. Denufosol is metabolically more stable and better tolerated, and may enhance mucociliary clearance for a longer period of time than previously investigated P2Y(2) agonists. The goal of this phase 1/phase 2 study was to assess the safety and tolerability of single and repeated doses of aerosolized denufosol in subjects with CF. The study was a double-blind, placebo-controlled, multicenter comparison of ascending single doses of denufosol (10, 20, 40, and 60 mg, administered by inhalation via the Pari LC Star nebulizer) vs. placebo (normal saline), followed by a comparison of twice-daily administration of the maximum tolerated dose (MTD) of denufosol or placebo for 5 days. Thirty-seven adult (18 years of age or older) and 24 pediatric (5-17 years of age) subjects with CF were evaluated in five cohorts. Subjects were randomized in a 3:1 ratio to receive either denufosol or placebo within each cohort. The percent of subjects experiencing adverse events was similar between the denufosol and placebo groups. The most common adverse event in subjects receiving denufosol was chest tightness in adult subjects (39%) and cough in pediatric subjects (56%). Three (7%) subjects receiving denufosol and one (7%) subject receiving placebo experienced a serious adverse event. Forced expiratory volume in 1 sec (FEV(1)) profiles following dosing were similar across treatment groups, with some acute, reversible decline seen in both groups, most notably in subjects with lower lung function at baseline. In conclusion, doses up to 60 mg of denufosol inhalation solution were well-tolerated in most subjects. Some intolerability was noted among subjects with lower baseline lung function. Based on the results of this phase 1/phase 2 study, the Therapeutics Development Network (TDN) of the Cystic Fibrosis Foundation (CFF) and Inspire Pharmaceuticals, Inc., recently completed a multicenter, 28-day, phase 2 safety and efficacy clinical trial of denufosol inhalation solution in CF subjects with mild lung disease.

    View details for DOI 10.1002/ppul.20192

    View details for Web of Science ID 000227814300010

    View details for PubMedID 15704203

  • Altered airway responsiveness in CD38-deficient mice AMERICAN JOURNAL OF RESPIRATORY CELL AND MOLECULAR BIOLOGY Deshpande, D. A., White, T. A., Guedes, A. G., Milla, C., Walseth, T. F., Lund, F. E., Kannan, M. S. 2005; 32 (2): 149-156

    Abstract

    Cyclic ADP-ribose (cADPR) mobilizes calcium from intracellular stores and contributes to agonist-induced intracellular calcium elevation in airway smooth muscle (ASM). In this study we determined the functional role of CD38/cADPR signaling in the regulation of airway tone using CD38 deficient (cd38(-/-)) mice. The responsiveness to different doses of methacholine, as determined by changes in lung resistance and dynamic compliance, was significantly (P < or = 0.05) lower in cd38(-/-) mice compared with wild-type controls. To determine the mechanism responsible for the reduced responsiveness, we measured the intracellular calcium responses to contractile agonists in ASM cells. In ASM cells isolated from cd38(-/-) mice, the intracellular calcium responses to acetylcholine and endothelin-1 were significantly lower than in controls. Pretreatment of ASM cells with a cADPR antagonist resulted in attenuated intracellular calcium responses to endothelin-1 in cells isolated from wild-type mice, but not in those isolated from the cd38(-/-) mice. Very low cADPR levels and no detectable ADP-ribosyl cyclase activity were observed in lung tissue from cd38(-/-) mice, suggesting that CD38 is a critical source for cADPR synthesis. The results of the present study demonstrate that CD38/cADPR contributes to airway smooth muscle tone and responsiveness through its effects on agonist-induced elevation of intracellular calcium in ASM cells.

    View details for DOI 10.1165/rcmb.2004-02430C

    View details for Web of Science ID 000226782700010

    View details for PubMedID 15557017

  • Natural history of pulmonary complications in children after bone marrow transplantation BIOLOGY OF BLOOD AND MARROW TRANSPLANTATION Eikenberry, M., Bartakova, H., DeFor, T., Haddad, I. Y., Ramsay, N. K., Blazar, B. R., Milla, C. E., Cornfield, D. N. 2005; 11 (1): 56-64

    Abstract

    We sought, in children after bone marrow transplantation (BMT), (1) to determine the natural history and incidence of pulmonary complications, (2) to evaluate the diagnostic yield of fiberoptic bronchoscopy and bronchoalveolar lavage (BAL); and (3) to determine the effect of bronchoscopy with lavage on patient outcome. The study design was a retrospective review in a tertiary care university hospital of all children undergoing BMT over a 5-year period. Patients were separated into 2 study groups: children with and without pulmonary complications. Pulmonary complications were defined as new or persistent pulmonary infiltrates on chest radiograph or chest computed tomography scan, respiratory symptoms, hypoxemia, or hemoptysis. Three hundred sixty-three pediatric patients underwent BMT between January 1, 1995, and December 31, 1999. Ninety patients (25%) developed pulmonary complications and were evaluated with bronchoscopy and BAL. Patients with pulmonary complications had a higher mortality (65% versus 44%; P < .01). The median posttransplantation survival for children with pulmonary complications was 258 days, compared with 1572 days in patients without pulmonary complications. The incidence of pulmonary complications was increased in patients with allogeneic BMT (P < .01). The time-dependent onset of severe (grade III to IV) graft-versus-host disease increased the relative risk of pulmonary complications by 2.0 (95% confidence interval, 1.1-3.7; P = .02). Pulmonary complications increased the time-dependent relative risk of mortality by 3.5 (95% confidence interval, 2.5-4.8). The diagnostic yield of bronchoscopy with lavage was 46% in patients undergoing BAL. Diagnostic bronchoscopy did not enhance either 30- or 100-day survival. Pathogen identification did not decrease mortality (P = .45). Pulmonary complications occur in 25% of children undergoing BMT and increase the risk of death in the first year after BMT. Although pathogen identification does not confer a survival advantage, rigorous, prospective screening may allow for earlier identification of pathogens and thereby provide a benefit to this uniquely vulnerable population.

    View details for DOI 10.1016/j.bbmt.2004.09.008

    View details for Web of Science ID 000226450300007

    View details for PubMedID 15625545

  • Insulin regulation of free fatty acid kinetics in adult cystic fibrosis patients with impaired glucose tolerance METABOLISM-CLINICAL AND EXPERIMENTAL Moran, A., Basu, R., Milla, C., Jensen, M. D. 2004; 53 (11): 1467-1472

    Abstract

    Cystic fibrosis (CF) patients are insulin-resistant with regards to suppression of hepatic glucose production and proteolysis, but the effect of insulin on adipose free fatty acid (FFA) release has not been studied. [9,10-(3)H]palmitate kinetics were measured in 11 stable adult CF patients with impaired glucose tolerance (IGT) and 9 normal control subjects. Baseline plasma palmitate concentrations [CF = 99 +/- 13 (median 74, range 65 to 187); control = 88 +/- 9 (88, 46 to 138) micromol/L, P = .9] and palmitate flux [CF = 114 +/- 11 (100, 72 to 171); control = 105 +/- 12 (106, 54 to 182) micromol/min, P = 0.9] were not different between CF patients and controls. During a euglycemic clamp with infusion of insulin to physiologic postprandial levels, however, palmitate concentrations tended to be higher in CF patients: CF = 18 +/- 3 (13, 10 to 47), control = 12 +/- 1 (11, 8 to 18) micromol/L, P = 0.08. The higher palmitate concentrations during hyperinsulinemia appeared to be due to reduced suppression of adipose tissue palmitate release, because mean palmitate flux was 33% greater in CF subjects [32 +/- 5 (26, 17 to 66) micromol/min] than controls: [24 +/- 2 (23, 17 to 34) micromol/min], P = .20. There was considerably greater heterogeneity in insulin-induced suppression of plasma palmitate concentration and flux in CF patients compared to normal control subjects. In summary, a defect in insulin suppression of lipolysis was seen in clinically stable CF patients with IGT, similar to what has been described in CF for amino acid and glucose metabolism. This quantitative difference in lipolysis may account for inadequate insulin-induced suppression of hepatic glucose production in CF, and may be a metabolic adaptation to increased energy needs.

    View details for DOI 10.1016/j.metabol.2004.06.015

    View details for Web of Science ID 000225070400014

    View details for PubMedID 15536603

  • Association of nutritional status and pulmonary function in children with cystic fibrosis CURRENT OPINION IN PULMONARY MEDICINE Milla, C. E. 2004; 10 (6): 505-509

    Abstract

    Multiple studies have shown that nutritional status is a strong predictor of morbidity and mortality in patients with cystic fibrosis (CF). Since CF is characterized by progressive lung disease, it could be argued that the underlying lung disease is what determines the nutritional failure seen in most patients. This review will summarize the data available from studies that have attempted to better define this relation and also present a review of the possible mechanisms involved taken from both observational and interventional studies.Longitudinal studies with sufficiently large follow-up times have demonstrated that young underweight patients have worst pulmonary function outcomes. More importantly, these studies concur in that the yearly change in growth parameters has a significant effect on the rate at which pulmonary function develops. Although the mechanisms behind this important association are yet unclear, there is some suggestion from interventional studies that the accrual of lean body mass is the factor that is involved in the preservation of lung function.Nutritional status strongly influences pulmonary health among CF patients. Therefore, aggressive nutritional support aiming at achieving normal growth patterns should lead to adequate development of lung function and maintenance of pulmonary health. However, more research is required with long-term longitudinal studies to better identify the most critical nutritional characteristics influencing this process as well as the most effective nutritional interventions.

    View details for Web of Science ID 000224924300009

    View details for PubMedID 15510058

  • Myeloperoxidase deficiency enhances inflammation after allogeneic marrow transplantation AMERICAN JOURNAL OF PHYSIOLOGY-LUNG CELLULAR AND MOLECULAR PHYSIOLOGY Milla, C., Yang, S. X., Cornfield, D. N., Brennan, M. L., Hazen, S. L., Panoskaltsis-Mortari, A., Blazar, B. R., Haddad, I. Y. 2004; 287 (4): L706-L714

    Abstract

    Myeloperoxidase (MPO)-derived oxidants participate in the respiratory antimicrobial defense system but are also implicated in oxidant-mediated acute lung injury. We hypothesized that MPO contributes to lung injury commonly observed after bone marrow transplantation (BMT). MPO-sufficient (MPO+/+) and -deficient (MPO-/-) mice were given cyclophosphamide and lethally irradiated followed by infusion of inflammation-inducing donor spleen T cells at time of BMT. Despite suppressed generation of nitrative stress, MPO-/- recipient mice unexpectedly exhibited accelerated weight loss and increased markers of lung dysfunction compared with MPO+/+ mice. The increased lung injury during MPO deficiency was a result of donor T cell-dependent inflammatory responses because bronchoalveolar lavage fluids (BALF) from MPO-/- mice contained increased numbers of inflammatory cells and higher levels of the proinflammatory cytokine TNF-alpha and the monocyte chemoattractant protein-1 compared with wild-type mice. Enhanced inflammation in MPO-/- mice was associated with suppressed apoptosis of BALF inflammatory cells. The inflammatory process in MPO-/- recipients was also associated with enhanced necrosis of freshly isolated alveolar type II cells, critical for preventing capillary leak. We conclude that suppressed MPO-derived oxidative/nitrative stress is associated with enhanced lung inflammation and persistent alveolar epithelial injury.

    View details for DOI 10.1152/ajplung.00015.2004

    View details for Web of Science ID 000223762200011

    View details for PubMedID 15020295

  • Peroxidase activity within circulating neutrophils correlates with pulmonary phenotype in cystic fibrosis JOURNAL OF LABORATORY AND CLINICAL MEDICINE Garner, H. P., PHILLIPS, J. R., Herron, J. G., Severson, S. J., Milla, C. E., Regelmann, W. E. 2004; 144 (3): 127-133

    Abstract

    Excess neutrophils are present in the airways of patients with cystic fibrosis (CF). Myeloperoxidase (MPO) activity of acid extracts of sputum is directly correlated with airflow obstruction in CF patients. We hypothesized that the sputum MPO was derived from the MPO of neutrophils that entered the airways from the circulation. Active MPO without protease activity injures airways. If MPO activity from circulating neutrophils that emigrate into the airways of these patients causes increased airway epithelial permeability and mucus-gland secretion, then (1) those patients with greater MPO activity per circulating neutrophil would be more likely to produce sputum and (2) the MPO activity per circulating neutrophil would positively correlate with airflow obstruction. We determined the MPO activity for both circulating and sputum neutrophils. Spirometry and respiratory cultures were obtained simultaneously with blood and sputum samples. CF patients with more MPO activity within their circulating neutrophils were more likely to produce sputum ( P =.001, chi 2 test), and the MPO activity per circulating neutrophil was positively correlated with airflow obstruction as measured on the basis of the ratio of 1-second forced expiratory volume to forced vital capacity ( P <. 03, Kruskal-Wallace test). These associations were independent of age, sex, the results of respiratory-tract culture, or protease activity in the circulating neutrophils. MPO activity in circulating neutrophils from CF patients homozygotic for the deletion of phenylalanine at position 508 in the CF transmembrane regulator protein is directly related to the severity of these patients' pulmonary disease. Our results are consistent with the hypothesis that circulating neutrophils deliver active MPO to the airway, producing airway injury and airflow obstruction in homozygotic delF508 CF patients.

    View details for Web of Science ID 000224363900003

    View details for PubMedID 15454881

  • Methodologic advancements in the study of airway smooth muscle. journal of allergy and clinical immunology Kotlikoff, M. I., Kannan, M. S., Solway, J., Deng, K., Deshpande, D. A., Dowell, M., Feldman, M., Green, K. S., Ji, G., Johnston, R., Lakser, O., Lee, J., Lund, F. E., Milla, C., Mitchell, R. W., Nakai, J., Rishniw, M., Walseth, T. F., White, T. A., Wilson, J., Xin, H., Woodruff, P. G. 2004; 114 (2): S18-31

    Abstract

    The study of isolated airway myocytes has provided important information relative to specific processes that regulate contraction, proliferation, and synthetic properties of airway smooth muscle (ASM). To place this information in physiological context, however, improved methods to examine airway biology in vivo are needed. Advances in genetic, biochemical, and optical methods provide unprecedented opportunities to improve our understanding of in vivo physiology and pathophysiology. This article describes 4 important methodologic advances in the study of ASM: (1) the development of transgenic mice that could be used to investigate ASM proliferation and phenotype switching during the development of hypersensitivity, and to investigate excitation-contraction coupling; (2) the use of CD38-deficient mice to confirm the role of CD38-dependent, cyclic adenosine diphosphate-ribose-mediated calcium release in airway responsiveness; (3) investigation of the role of actin filament length and p38 mitogen-activated protein kinase activity in regulating the mechanical plasticity-elasticity balance in contracted ASM; and (d) the use of bronchial biopsies to study ASM structure and phenotype in respiratory science.

    View details for PubMedID 15309016

  • High-frequency chest compression: effect of the third generation compression waveform. Biomedical instrumentation & technology Milla, C. E., Hansen, L. G., Weber, A., Warwick, W. J. 2004; 38 (4): 322-328

    Abstract

    High-frequency chest compression (HFCC) therapy has become the prevailing form of airway clearance for patients with cystic fibrosis (CF) in the United States. The original square waveform was replaced in 1995 with a sine waveform without published evidence of an equality of effectiveness. The recent development of a triangle waveform for HFCC provided the opportunity to compare the functional and therapeutic effects of different waveforms. Clinical testing was done in patients at home with therapy times recorded with all sputum collected in preweighed sealable vials. The eight study patients with CF were regular users of a sine waveform device. They produced sputum consistently and were clinically stable. They used their optimum frequencies for therapy for each waveform and, for one week for each waveform, collected all sputum during their twice-daily timed HFCC therapies. After collection, these vials were reweighed, desiccated, and reweighed to calculate wet and dry weights of sputum per minute of therapy time. Frequency associated vest pressures transmitted to the mouth, and induced airflows at the mouth were measured in healthy volunteers. The pressure waveforms produced in the vest were, in shape, faithfully demonstrable at the mouth. In the healthy subject the transmission occurred in 2 ms and was attenuated to about 75% of the vest pressure for the triangle waveform and 60% for the sine waveform. All patients produced more sputum with the triangle waveform than with the sine waveform. The mean increase was 20%+ range of 4% to 41%. P value was <.001. Future studies of HFCC should investigate the other effects of the sine and triangle waveforms, as well as the neglected square waveform, on mucus clearance and determine the best frequencies for each waveform, disease, and patient.

    View details for PubMedID 15338841

  • Repeated adeno-associated virus serotype 2 aerosol-mediated cystic fibrosis transmembrane regulator gene transfer to the lungs of patients with cystic fibrosis - A multicenter, double-blind, placebo-controlled trial CHEST Moss, R. B., Rochman, D., Spencer, L. T., Aitken, M. L., Zeitlhi, P. L., Waltz, D., Milla, C., Brody, A. S., Clancy, J. P., Ramsey, B., Hamblett, N., Heald, A. E. 2004; 125 (2): 509-521

    Abstract

    The primary objective was to determine the safety and tolerability of repeated doses of aerosolized adeno-associated serotype 2 vector containing cystic fibrosis transmembrane conductance regulator (CFTR) complementary DNA (cDNA) [tgAAVCF], an adeno-associated virus (AAV) vector encoding the complete human CFTR cDNA. Secondary objectives included evaluation of pulmonary function assessed by spirometry, lung abnormalities by high-resolution CT (HRCT), airway cytokines, vector shedding, serum neutralizing antibody to AAV serotype 2 (AAV2), and gene transfer and expression in a subset of subjects undergoing bronchoscopy with bronchial brushings.Randomized, double-blind, placebo-controlled, phase II trial.Eight cystic fibrosis (CF) centers in the United States.CF patients with mild lung disease, defined as FEV(1) > or =60% predicted.Subjects were randomized to inhale three aerosolized doses of 1 x 10(13) deoxyribonuclease-resistant particles of tgAAVCF or matching placebo at 30-day intervals using the Pari LC Plus nebulizer (PARI; Richmond, VA). Measurements and results: Of 42 subjects randomized, 20 subjects received at least one dose of tgAAVCF and 17 subjects received placebo. No difference in the pattern of adverse events or laboratory abnormalities was noted between the two treatment groups. Improvements in induced-sputum interleukin-8 (p = 0.03) and FEV(1) (p = 0.04) were observed at day 14 and day 30, respectively, in the group receiving tgAAVCF when compared to those receiving placebo. No significant differences in HRCT scans were noted. Vector shedding in sputum was observed at low levels up to 90 days after the third dose of vector. All subjects receiving tgAAVCF exhibited an increase (by at least fourfold) in serum AAV2-neutralizing antibodies and detectable levels in BAL fluid from five of six treated subjects undergoing BAL. Gene transfer but not gene expression was detected in a subset of six tgAAVCF subjects who underwent bronchoscopy.Repeat doses of aerosolized tgAAVCF were safe and well tolerated, and resulted in encouraging trends in improvement in pulmonary function in patients with CF and mild lung disease.

    View details for Web of Science ID 000188978400026

    View details for PubMedID 14769732

  • Surfactant protein A is a required mediator of keratinocyte growth factor after experimental marrow transplantation AMERICAN JOURNAL OF PHYSIOLOGY-LUNG CELLULAR AND MOLECULAR PHYSIOLOGY Haddad, I. Y., Milla, C., Yang, S. X., Panoskaltsis-Mortari, A., Hawgood, S., Lacey, D. L., Blazar, B. R. 2003; 285 (3): L602-L610

    Abstract

    We reported an association between the ability of recombinant human keratinocyte growth factor (rHuKGF) to upregulate the expression of surfactant protein A (SP-A) and to downregulate pulmonary inflammation that occurs after allogeneic bone marrow transplantation (BMT). To establish a causal relationship, rHuKGF (5 mg/kg) was administered subcutaneously for three consecutive days before irradiation to SP-A-sufficient and -deficient [SP-A(+/+) and SP-A(-/-), respectively] mice given inflammation-inducing allogeneic spleen T cells at the time of BMT. In contrast with SP-A(+/+) mice, rHuKGF failed to suppress the high levels of TNF-alpha, IFN-gamma, and nitric oxide contained in bronchoalveolar lavage fluids collected on day 7 after BMT from SP-A(-/-) mice. Early post-BMT weight loss was attenuated by rHuKGF in both SP-A(+/+) and SP-A(-/-) recipients. In the absence of supportive respiratory care, however, SP-A deficiency eventually abolished the ability of rHuKGF to prevent weight loss and to improve survival monitored for 1 mo after allogeneic BMT. In further experiments, the addition of cyclophosphamide (which is known to cause severe injury to the alveolar epithelium in donor T cell-recipient mice) to the conditioning regimen prevented rHuKGF-induced upregulation of SP-A and suppression of lung inflammation in both SP-A(+/+) and SP-A(-/-) mice. We conclude that endogenous baseline SP-A levels and optimal upregulation of SP-A are required for the anti-inflammatory protective effects of KGF after allogeneic transplantation.

    View details for DOI 10.1152/ajplung.00088.2003

    View details for Web of Science ID 000184565600013

    View details for PubMedID 12740217

  • Longitudinal changes in growth parameters are correlated with changes in pulmonary function in children with cystic fibrosis PEDIATRICS Peterson, M. L., Jacobs, D. R., Milla, C. E. 2003; 112 (3): 588-592

    Abstract

    Nutritional status is associated with pulmonary health and survival in children with cystic fibrosis (CF). This study evaluated the weight gain pattern of children with CF in relation to the longitudinal trends of their pulmonary function. Our hypothesis was that children who experience continuous weight gain at a given rate will have better average forced expiratory volume in 1 second (FEV(1)) and change in FEV(1) than children who have weight gain patterns that deviate from this rate, even when total weight gain seems adequate.Prospectively collected data were examined in 319 children, aged 6 to 8, who were routinely followed at the Minnesota Cystic Fibrosis Center. One to 67 measurements of weight (kg), height (cm), and FEV(1) (mL) were taken per child during this 2-year period. The data were analyzed by repeated measure regression analysis and by growth pattern analysis.At baseline, a 1-kg higher initial weight was associated with a 55-mL higher average FEV(1). During the follow-up period, a 1-kg gain in weight was associated with an increase in FEV(1) by 32 mL. Children who had a steady weight gain tended to experience greater increases in FEV(1) than children who experienced periodic losses in weight.We established that children who weigh more and who gain weight at an appropriate and uninterrupted rate have a better FEV(1) trajectory. Aggressive nutritional support to maintain growth in these children may therefore improve FEV(1), which can be taken as a surrogate for better lung health, and may ultimately lead to better survival.

    View details for Web of Science ID 000185035100033

    View details for PubMedID 12949289

  • Safety of inhaled nitric oxide after lung transplantation JOURNAL OF HEART AND LUNG TRANSPLANTATION Cornfield, D. N., Milla, C. E., Haddad, I. Y., Barbato, J. E., Park, S. J. 2003; 22 (8): 903-907

    Abstract

    The present study tests the hypothesis that therapy with inhaled nitric oxide (iNO) at the time of lung transplantation in patients undergoing bilateral angle lung transplantation: (i) is safe; and (ii) does not increase either the duration of mechanical ventilation or the incidence of acute graft dysfunction.We conducted a prospective, non-randomized trial of iNO at 20 parts per million. The treatment group was comprised of 14 patients (10 females, 4 males) undergoing lung transplantation to address severe end-stage lung disease and pulmonary hypertension (mean pulmonary artery pressure > 30 mmHg). Clinical and histologic parameters were compared with 22 historical control subjects who were matched with the study population for age, diagnosis and disease severity (17 females, 5 males) and had undergone lung transplantation in the preceding 2-year time period. No significant differences were noted between the 2 study groups at baseline.No toxic effect of iNO treatment was evident. Although the incidence of acute graft dysfunction was the same in both groups, the occurrence of acute graft rejection in the initial 4 weeks after transplant was less frequent in the iNO group than in the control group (7% vs 32%, p = 0.05). Fifty percent of the treatment group, as compared with 22% of the control group, were discharged from the hospital within 2 weeks of the procedure (p = 0.05).Early initiation of iNO in lung transplant patients with pulmonary hypertension is safe and may decrease the incidence of acute graft rejection. We speculate that iNO may exert an immunomodulatory effect.

    View details for DOI 10.1016/S1053-2498(02)00809-4

    View details for Web of Science ID 000184634300011

    View details for PubMedID 12909471

  • Insulin glargine improves hemoglobin A1c in children and adolescents with poorly controlled type 1 diabetes. Pediatric diabetes Jackson, A., Ternand, C., Brunzell, C., Kleinschmidt, T., Dew, D., Milla, C., Moran, A. 2003; 4 (2): 64-69

    Abstract

    The pediatric diabetes team at the University of Minnesota made a clinical decision to switch patients with type 1 diabetes with a hemoglobin A1c level greater than 8.0% to insulin glargine in an effort to improve glycemic control. Retrospective chart analysis was performed on 37 patients 6 months after the switch to insulin glargine therapy.After 6 months, the average hemoglobin A1c level in the entire cohort dropped from 10.1 +/- 2.0 to 8.9 +/- 1.6% (p = 0.001). Thirty patients responded with an average hemoglobin A1c drop of 1.7 +/- 1.5%, from 10.3 +/- 2.2 to 8.6 +/- 1.5% (p < 0.001). Seven patients did not respond to insulin glargine therapy, with an average hemoglobin A1c rise of 1.0 +/- 0.8% from a baseline of 9.5 +/- 1.0% to 10.4 +/- 1.4% (p = 0.01). The greatest response was seen in children with an A1c > 12.0%, who dropped their hemoglobin A1c by 3.5 +/- 1.9%. Compared with responders, non-responders had significantly less contact with the diabetes team in the form of clinic visits and telephone conversations both before and after initiation of glargine therapy. Sixty-two per cent of patients received insulin glargine at lunchtime, when injections could be supervised at school. Three episodes of severe hypoglycemia occurred after initiation of insulin glargine therapy.Insulin glargine substantially improved glycemic control in children and adolescents with poorly controlled type 1 diabetes. This response was most remarkable in those with a baseline hemoglobin A1c level > 12.0%, and may have been related to increased supervision of injections.

    View details for PubMedID 14655261

  • Abnormal glucose tolerance in cystic fibrosis: Why should patients be screened? JOURNAL OF PEDIATRICS Moran, A., Milla, C. 2003; 142 (2): 97-99

    View details for DOI 10.1067/mpd.2003.90

    View details for Web of Science ID 000181144400005

    View details for PubMedID 12584525

  • Continuous propofol infusion in 142 critically ill children PEDIATRICS Cornfield, D. N., Tegtmeyer, K., Nelson, M. D., Milla, C. E., Sweeney, M. 2002; 110 (6): 1177-1181

    Abstract

    In recent years, continuous intravenous propofol infusion has been widely used in pediatric intensive care units. Several case reports have raised concerns about its safety. The objective of this study was to report our experience with continuous intravenous propofol in consecutive patients during an 18-month period.The study design was a retrospective review of a case series. Case was defined as a critically ill child who was treated with continuous intravenous propofol. The attending physician staff agreed to prescribe propofol via continuous intravenous infusion at a dose not to exceed 50 microg/kg/min. The protocol allowed for each patient to receive an additional intravenous bolus of propofol at a dose of 1 mg/kg no more than once per hour. The study entailed data collection from consecutive patients who were prescribed a continuous infusion of propofol in either the pediatric intensive care unit or bone marrow transplant unit.Data from 142 patients were analyzed. Each patient enrolled was adequately sedated. Administration of propofol via continuous intravenous infusion was not associated with metabolic acidosis or hemodynamic compromise. No patient in the study group was inadvertently extubated or had a central venous catheter accidentally discontinued.Propofol can be safely and effectively used to provide sedation to critically ill infants and children. We speculate that continuous infusion of propofol for extended periods of time should not exceed 67 microg/kg/min.

    View details for Web of Science ID 000179549200034

    View details for PubMedID 12456916

  • Surfactant protein A decreases lung injury and mortality after murine marrow transplantation AMERICAN JOURNAL OF RESPIRATORY CELL AND MOLECULAR BIOLOGY Yang, S. X., Milla, C., Panoskaltsis-Mortari, A., Hawgood, S., Blazar, B. R., Haddad, I. Y. 2002; 27 (3): 297-305

    Abstract

    Surfactant protein A (SP-A), a collectin associated with surfactant lipids, can have immune modulatory effects. We hypothesized that exogenous and basal endogenous SP-A can function to suppress donor T-cell-dependent inflammation that occurs during the generation of idiopathic pneumonia syndrome after bone marrow transplantation (BMT). Wild-type and SP-A-deficient mice were conditioned with cyclophosphamide and lethal irradiation and then given allogeneic donor bone marrow plus inflammation-inducing spleen T cells. On Day 7 after BMT, bronchoalveolar lavage fluids from SP-A-deficient mice contained increased numbers of inflammatory cells and higher levels of proinflammatory mediators tumor necrosis factor-alpha, interferon-gamma, and nitric oxide than wild-type mice. Exaggerated inflammation in SP-A-deficient mice was associated with decreased dynamic lung compliance and increased donor T-cell-dependent mortality (P = 0.0007, n = 10). Nitrative stress in alveolar macrophages from SP-A(-/-)-conditioned BMT recipients was higher than for SP-A(+/+) mice. Similarly, mice treated with transtracheal human SP-A (50 micro g), instilled on Day 4 after BMT during a time of in vivo donor T cell activation, exhibited decreased inflammation and improved early survival compared with buffer-instilled mice. We concluded that basal endogenous SP-A and enhanced alveolar SP-A level modulate donor T-cell-dependent immune responses and prolong survival after allogeneic BMT.

    View details for DOI 10.1165/rcmb.2002-0035OC

    View details for Web of Science ID 000177806500004

    View details for PubMedID 12204891

  • Abnormal lipid concentrations in cystic fibrosis AMERICAN JOURNAL OF CLINICAL NUTRITION FIGUEROA, V., Milla, C., Parks, E. J., Schwarzenberg, S. J., Moran, A. 2002; 75 (6): 1005-1011

    Abstract

    Concentrations of cholesterol and triacylglycerol are commonly believed to be low in persons with cystic fibrosis and thus not of concern.The goal was to determine whether concentrations of cholesterol and triacylglycerol are related to glucose tolerance or nutritional status in patients with cystic fibrosis.Fasting lipid profiles were measured in 192 patients ( +/- SD age: 21 +/- 11 y) in conjunction with an oral-glucose-tolerance test.Cystic fibrosis patients in all age groups had higher triacylglycerol (1.51 +/- 0.95 mmol/L) and lower cholesterol (3.57 +/- 0.96 mmol/L) concentrations than US population means. Thirty patients (16%) had hypertriglyceridemia (3.22 +/- 1.22 mmol/L), and 8 patients (4%) had elevated cholesterol (6.05 +/- 1.32 mmol/L). In most cases, hypertriglyceridemia was isolated; only 3 subjects had elevation of both cholesterol and triacylglycerol. Lipid concentrations were not related to body mass index, weight, glucose tolerance, the areas under the curve for glucose or insulin, or glycated hemoglobin. Lipid concentrations also did not correlate with cystic fibrosis genotype, use of systemic steroids, blood pressure, liver enzymes, C-reactive protein, or pulmonary function.Isolated hypertriglyceridemia appears to be common in cystic fibrosis, whereas cholesterol concentrations are generally low. Hypertriglyceridemia may be related to chronic low-grade inflammation or to a dietary macronutrient imbalance with excessive simple carbohydrate absorption relative to fat absorption. Whether it is associated with a risk of cardiovascular disease in this population is uncertain, but the clinical significance of triacylglycerol elevation may become important as survival improves.

    View details for Web of Science ID 000175783200008

    View details for PubMedID 12036806

  • Effects of oxidant stress on inflammation and survival of iNOS knockout mice after marrow transplantation AMERICAN JOURNAL OF PHYSIOLOGY-LUNG CELLULAR AND MOLECULAR PHYSIOLOGY Yang, S. X., Porter, V. A., Cornfield, D. N., Milla, C., Panoskaltsis-Mortari, A., Blazar, B. R., Haddad, I. Y. 2001; 281 (4): L922-L930

    Abstract

    In a model of idiopathic pneumonia syndrome after bone marrow transplantation (BMT), injection of allogeneic T cells induces nitric oxide (.NO), and the addition of cyclophosphamide (Cy) generates superoxide (O.) and a tissue-damaging nitrating oxidant. We hypothesized that.NO and O. balance are major determinants of post-BMT survival and inflammation. Inducible nitric oxide synthase (iNOS) deletional mutant mice (-/-) given donor bone marrow and spleen T cells (BMS) exhibited improved survival compared with matched BMS controls. Bronchoalveolar lavage fluids obtained on day 7 post-BMT from iNOS(-/-) BMS mice contained less tumor necrosis factor-alpha and interferon-gamma, indicating that.NO stimulated the production of proinflammatory cytokines. However, despite suppressed inflammation and decreased nitrotyrosine staining, iNOS(-/-) mice given both donor T cells and Cy (BMS + Cy) died earlier than iNOS-sufficient BMS + Cy mice. Alveolar macrophages from iNOS(-/-) BMS + Cy mice did not produce.NO but persisted to generate strong oxidants as assessed by the oxidation of the intracellular fluorescent probe 2',7'-dichlorofluorescin. We concluded that.NO amplifies T cell-dependent inflammation and addition of Cy exacerbates.NO-dependent mortality. However, the lack of.NO during Cy-induced oxidant stress decreases survival of T cell-recipient mice, most likely by generation of.NO-independent toxic oxidants.

    View details for Web of Science ID 000171020400019

    View details for PubMedID 11557596

  • Insulin and glucose excursion following premeal insulin lispro or repaglinide in cystic fibrosis-related diabetes DIABETES CARE Moran, A., Phillips, J., Milla, C. 2001; 24 (10): 1706-1710

    Abstract

    Insulin and glucose levels in response to premeal insulin lispro or repaglinide were evaluated in adult patients with cystic fibrosis-related diabetes (CFRD) without fasting hyperglycemia.Seven patients with CFRD were fed 1,000-kcal liquid mixed meals. Three study conditions were administered in random order on separate mornings: 1) no premeal diabetes medication, 2) insulin lispro, 0.1 unit/kg body wt premeal and 3) repaglinide 1 mg premeal. Glucose and insulin levels were measured every 20 min for 5 h.Fasting insulin and glucose levels were normal in patients with CFRD, but the peak glucose level was elevated. Insulin lispro significantly decreased the peak glucose level (P = 0.0004) and the 2-h (P = 0.001) and 5-h (P < 0.0001) glucose area under the curve (AUC). Repaglinide significantly decreased the 5-h glucose AUC (P = 0.03). Neither drug completely normalized cystic fibrosis glucose excursion at the doses used for this study. Insulin lispro significantly increased the 5-h insulin AUC (P = 0.04).In response to subcutaneous insulin lispro, postprandial glucose excursion was significantly diminished and insulin secretion was enhanced compared with a control meal in which no medication was given to patients with CFRD. The oral agent repaglinide resulted in lesser corrections in these parameters. Neither drug completely normalized glucose or insulin levels, suggesting that the doses chosen for this study were suboptimal. Placebo-controlled longitudinal studies comparing the effectiveness of repaglinide and insulin on glucose metabolic control as well as overall nutrition and body weight are needed to help determine optimal medical treatment of CFRD.

    View details for Web of Science ID 000171321600002

    View details for PubMedID 11574430

  • Protein metabolism in clinically stable adult cystic fibrosis patients with abnormal glucose tolerance DIABETES Moran, A., Milla, C., Ducret, R., Nair, K. S. 2001; 50 (6): 1336-1343

    Abstract

    Cystic fibrosis (CF) patients are reported to experience chronic protein catabolism. Since diabetes or impaired glucose tolerance (IGT) is common in CF, we hypothesized that their protein catabolic state is related to reduced insulin secretion or reduced insulin action. A total of 12 clinically stable adult CF patients with abnormal glucose tolerance and 12 age-, sex-, and lean body mass-matched healthy control subjects underwent protein turnover studies using L-[1-(13)C]leucine, L-[(15)N]phenylalanine, and L-[(2)H(4)]tyrosine, with and without exogenous insulin infusion. In the baseline fasting state, protein metabolism was entirely normal in CF patients, with no evidence of increased protein catabolism. In contrast, striking abnormalities were seen in CF patients when insulin was infused, since they did not experience normal suppression of the appearance rates of leucine, phenylalanine, or tyrosine (indexes of protein breakdown). At an insulin concentration of 45 +/- 2 microU/ml, normal control subjects suppressed the leucine appearance rate by 19 +/- 5% (P < 0.01), ketoisocaproate appearance rate by 10 +/- 3% (P = 0.03), tyrosine appearance rate by 11 +/- 2% (P = 0.03), and phenylalanine appearance rate by 6 +/- 3% (P = 0.07). Phenylalanine conversion to tyrosine decreased by 22 +/- 7% (P = 0.03). At a similar insulin concentration of 44 +/- 3 microU/ml, normal suppression of amino acid appearance did not occur in CF. The leucine appearance rate decreased by 4 +/- 2% (P = 0.65), ketoisocaproate appearance rate by 1 +/- 2% (P = 0.94), tyrosine appearance rate by 0 +/- 6% (P = 0.56), phenylalanine appearance rate by 5 +/- 6% (P = 0.34), and phenylalanine conversion to tyrosine by 5 +/- 6% (P = 0.95). Poor suppression of the amino acid appearance rate in CF was not related to previously documented glucose tolerance status (IGT or CF-related diabetes without fasting hyperglycemia), fasting insulin levels, the acute insulin response, insulin sensitivity, cytokine or counterregulatory hormone levels, resting energy expenditure, caloric intake, pulmonary function, or clinical status. Protein synthesis was not significantly affected by insulin infusion in either normal control subjects or CF patients. In conclusion, clinically stable adult CF patients have normal indexes of protein breakdown and synthesis in the fasting state. In contrast, elevation of plasma insulin to physiological postprandial levels fails to normally suppress indexes of protein breakdown. It is therefore likely that inability to spare protein during the postprandial state is the cause of protein catabolism in these patients.

    View details for Web of Science ID 000168961900014

    View details for PubMedID 11375334

  • Human surfactant protein A suppresses T cell-dependent inflammation and attenuates the manifestations of idiopathic pneumonia syndrome in mice AMERICAN JOURNAL OF RESPIRATORY CELL AND MOLECULAR BIOLOGY Yang, S. X., Milla, C., Panoskaltsis-Mortari, A., Ingbar, D. H., Blazar, B. R., Haddad, I. Y. 2001; 24 (5): 527-536

    Abstract

    We have previously shown an association between growth factor-induced upregulation of surfactant protein (SP)-A and suppression of alveolar inflammation in our murine model of donor T cell-dependent lung dysfunction after bone-marrow transplantation, referred to as idiopathic pneumonia syndrome (IPS). We hypothesized that SP-A protects the lung in vivo from IPS injury by downregulation of alveolar inflammation. Human SP-A (100 microg), purified by n-butanol extraction or preparative isoelectric focusing, was transtracheally instilled on Day 4 after BMT during a time of in vivo donor T-cell activation. At 48 h after treatment, immunohistochemical staining of lung sections showed that SP-A did not alter T cell- dependent cellular infiltration. However, macrophages from SP-A-instilled mice were less injured and spontaneously produced less tumor necrosis factor-alpha than did cells from buffer-instilled mice. Although exogenous SP-A did not significantly alter bronchoalveolar lavage fluid (BALF) high levels of total protein (TP), an inverse correlation between BALF SP-A and TP concentrations (r = -0.65; P = 0.02) was observed in SP-A-treated but not in buffer-instilled mice. The only difference between the effects of the two sources of SP-A was that butanol-extracted SP-A, but not isoelectric focusing-purified SP-A, suppressed the interferon-gamma/nitric oxide pathway. We conclude that SP-A downregulates T cell-dependent alveolar inflammation by multiple pathways leading to decreased IPS injury.

    View details for Web of Science ID 000168913300004

    View details for PubMedID 11350821

  • Recombinant human DNase in cystic fibrosis LANCET Milla, C. E. 1999; 354 (9176): 428-428

    View details for Web of Science ID 000081764900061

    View details for PubMedID 10437902

  • NO causes perinatal pulmonary vasodilation through K+-channel activation and intracellular Ca2+ release AMERICAN JOURNAL OF PHYSIOLOGY-LUNG CELLULAR AND MOLECULAR PHYSIOLOGY Saqueton, C. B., Miller, R. B., Porter, V. A., Milla, C. E., Cornfield, D. N. 1999; 276 (6): L925-L932

    Abstract

    Evidence suggests that nitric oxide (NO) causes perinatal pulmonary vasodilation through K+-channel activation. We hypothesized that this effect worked through cGMP-dependent kinase-mediated activation of Ca2+-activated K+ channel that requires release of intracellular Ca2+ from a ryanodine-sensitive store. We studied the effects of 1) K+-channel blockade with tetraethylammonium, 4-aminopyridine, a voltage-dependent K+-channel blocker, or glibenclamide, an ATP-sensitive K+-channel blocker; 2) cyclic nucleotide-sensitive kinase blockade with either KT-5823, a guanylate-sensitive kinase blocker, or H-89, an adenylate-sensitive kinase blocker; and 3) blockade of intracellular Ca2+ release with ryanodine on NO-induced pulmonary vasodilation in acutely prepared late-gestation fetal lambs. N-nitro-L-arginine, a competitive inhibitor of endothelium-derived NO synthase, was infused into the left pulmonary artery, and tracheotomy was placed. The animals were ventilated with 100% oxygen for 20 min, followed by ventilation with 100% oxygen and inhaled NO at 20 parts/million (ppm) for 20 min. This represents the control period. In separate protocols, the animals received an intrapulmonary infusion of the different blockers and were ventilated as above. Tetraethylammonium (n = 6 animals) and KT-5823 (n = 4 animals) attenuated the response, whereas ryanodine (n = 5 animals) blocked NO-induced perinatal pulmonary vasodilation. 4-Aminopyridine (n = 5 animals), glibenclamide (n = 5 animals), and H-89 (n = 4 animals) did not affect NO-induced pulmonary vasodilation. We conclude that NO causes perinatal pulmonary vasodilation through cGMP-dependent kinase-mediated activation of Ca2+-activated K+ channels and release of Ca2+ from ryanodine-sensitive stores.

    View details for Web of Science ID 000080822700005

    View details for PubMedID 10362716

  • High levels of peroxynitrite are generated in the lungs of irradiated mice given cyclophosphamide and allogeneic T cells - A potential mechanism of injury after marrow transplantation AMERICAN JOURNAL OF RESPIRATORY CELL AND MOLECULAR BIOLOGY Haddad, I. Y., Panoskaltsis-Mortari, A., Ingbar, D. H., Yang, S. X., Milla, C. E., Blazar, B. R. 1999; 20 (6): 1125-1135

    Abstract

    In a murine bone-marrow transplant (BMT) model designed to determine risk factors for lung dysfunction in irradiated mice, we reported that cyclophosphamide (Cy)-induced injury and lethality depended on the infusion of donor spleen T cells. In the study reported here, we hypothesized that alveolar macrophage (AM)-derived reactive oxygen/nitrogen species are associated with lung dysfunction caused by allogeneic T cells, which stimulate nitric oxide (.NO) production, and by Cy, which stimulates superoxide production.NO reacts with superoxide to form peroxynitrite, a tissue-damaging oxidant. On Day 7 after allogeneic BMT, bronchoalveolar lavage fluid (BALF) obtained from mice injected with T cells contained increased levels of nitrite, which was associated with increased lactate dehydrogenase and protein levels, both of which are indices of lung injury. The injury was most severe in mice receiving both T cells and Cy. Messenger RNA (mRNA) for inducible nitric oxide synthase was detected only in murine lungs injected with T cells +/- Cy. AMs obtained on Day 7 after BMT from mice receiving T cells +/- Cy spontaneously generated between 20 and 40 microM nitrite in culture, versus < 2 microM generated by macrophages obtained from mice undergoing BMT but not receiving T cells. The level of 3-nitrotyrosine, the stable byproduct of the reaction of peroxynitrite with tyrosine residues, was increased in the BALF proteins of mice injected with both T cells and Cy. We conclude that allogeneic T cells stimulate macrophage-derived.NO, and that the addition of Cy favors peroxynitrite formation. Peroxynitrite generation clarifies the dependence of Cy-induced lung injury and lethality on the presence of allogeneic T cells.

    View details for Web of Science ID 000080955600006

    View details for PubMedID 10340931

  • Allergic bronchopulmonary aspergillosis and cystic fibrosis PEDIATRIC PULMONOLOGY Milla, C. E. 1999; 27 (2): 71-73

    View details for Web of Science ID 000078797500001

    View details for PubMedID 10088928

  • Long term effects of aerosolised rhDNase on pulmonary disease progression in patients with cystic fibrosis THORAX Milla, C. E. 1998; 53 (12): 1014-1017

    Abstract

    After multiple studies, including clinical trials, suggested some mild clinical benefits from the use of rhDNase by patients with cystic fibrosis, a widespread acceptance of the drug has followed. However, long-term effects, specifically on lung disease progression, have not been demonstrated. Experience with the use of this drug in a single cystic fibrosis centre is presented and compared with the trends seen in the patient population of the centre before the introduction of the drug.Patients with cystic fibrosis routinely followed at the University of Minnesota Cystic Fibrosis Center and prescribed rhDNase for at least two years were included in this retrospective study. Data on spirometric parameters (FEV1 and FEV1/FVC), allometric index, and admissions to hospital were retrieved from the centre's database for the two years preceding the prescription of rhDNase and the two years that followed. Trends in pulmonary function and allometric index were analysed by mixed linear modelling, and hospital admission rates for both periods were calculated and compared.One hundred and ninety patients met the inclusion criteria for the study. In the two years preceding the prescription of rhDNase the trends noted were those of a mild decline in FEV1, a stable FEV1/FVC, and a mild improvement in allometric index. In the two years that followed the prescription of rhDNase a mild decline in all these parameters occurred which was a significant change from the previous period (all p < 0.009). There was no difference between females and males in the trends experienced after the start of rhDNase. By logistic regression analysis only the presence of malnutrition at the time of prescription was associated with a positive trend after the introduction of rhDNase. No significant change in the hospital admission rates occurred, with rates of 0.52 (0.16) and 0.56 (0.21) admissions/patient/year for the periods before and after the prescription of rhDNase, respectively.The introduction of rhDNase to the regimen of patients with cystic fibrosis cared for at this centre has not been followed by a positive trend in lung function and nutritional parameters. There are some differences between this patient population and those who participated in previous studies which may help to explain the contrasting findings of this study. However, it is also possible that factors other than mucus clearance need to be improved to achieve a favourable response in disease progression. Patients on this treatment should be followed closely and the benefit judged on an individual basis. More studies are needed to define better the specific indications and use of this form of treatment.

    View details for Web of Science ID 000077712800005

    View details for PubMedID 10195070

  • Effects of inhaled nitric oxide and oxygen in high-altitude pulmonary edema CIRCULATION Anand, I. S., Prasad, B. A., Chugh, S. S., Rao, K. R., Cornfield, D. N., Milla, C. E., Singh, N., Singh, S., Selvamurthy, W. 1998; 98 (22): 2441-2445

    Abstract

    High-altitude pulmonary edema (HAPE) is characterized by pulmonary hypertension, increased pulmonary capillary permeability, and hypoxemia. Treatment is limited to descent to lower altitude and administration of oxygen.We studied the acute effects of inhaled nitric oxide (NO), 50% oxygen, and a mixture of NO plus 50% oxygen on hemodynamics and gas exchange in 14 patients with HAPE. Each gas mixture was given in random order for 30 minutes followed by 30 minutes washout with room air. All patients had severe HAPE as judged by Lake Louise score (6.4+/-0.7), PaO2 (35+/-3. 1 mm Hg), and alveolar to arterial oxygen tension difference (AaDO2) (26+/-3 mm Hg). NO had a selective effect on the pulmonary vasculature and did not alter systemic hemodynamics. Compared with room air, pulmonary vascular resistance fell 36% with NO (P<0.001), 23% with oxygen (P<0.001 versus air, P<0.05 versus NO alone), and 54% with NO plus 50% oxygen (P<0.001 versus air, P<0.005 versus oxygen and versus NO). NO alone improved PaO2 (+14%) and AaDO2 (-31%). Compared with 50% oxygen alone, NO plus 50% oxygen had a greater effect on AaDO2 (-18%) and PaO2 (+21%).Inhaled NO may have a therapeutic role in the management of HAPE. The combined use of inhaled NO and oxygen has additive effects on pulmonary hemodynamics and even greater effects on gas exchange. These findings indicate that oxygen and NO may act on separate but interactive mechanisms in the pulmonary vasculature.

    View details for Web of Science ID 000077278100015

    View details for PubMedID 9832490

  • Risk of death in cystic fibrosis patients with severely compromised lung function CHEST Milla, C. E., Warwick, W. J. 1998; 113 (5): 1230-1234

    Abstract

    Lung disease accounts for most of the mortality in patients with cystic fibrosis (CF). Lung transplantation is an option for patients severely impaired, being recommended when life expectancy is estimated to be <2 years. Our objectives were to evaluate in our patient population the validity of currently accepted criteria for low life expectancy and to identify other potentially useful criteria.Data were retrieved from CF patients followed up at our center who reached and kept an FEV1 <30% predicted. A life table was created and stratified according to characteristics believed to be of importance. In addition, the rate of decline in percent predicted FEV1 was analyzed. These characteristics were evaluated as predictors of risk of death.The median survival was 3.9 years (95% confidence interval, 2.88 to 4.12 years), with no significant differences according to gender, nutritional status, presence of diabetes, or decade in which the patient was cared for. Only by age was there a significant difference in the median survival (p<0.05). By proportional hazards regression, only the rate of decline in percent predicted FEV1 was a significant predictor of the risk of death, with a borderline effect from younger age (p=0.06).In our patient population, a cutoff value of FEV1 of < 30% predicted is not a reliable predictor of high risk of death within 2 years. The yearly rate of decline of percent predicted FEV1 is a better parameter to identify those patients at high risk for death.

    View details for Web of Science ID 000073591500019

    View details for PubMedID 9596299

  • PCR ribotyping and endonuclease subtyping in the epidemiology of Burkholderia cepacio infection AMERICAN JOURNAL OF RESPIRATORY AND CRITICAL CARE MEDICINE Shreve, M. R., Johnson, S. J., Milla, C. E., Wielinski, C. L., Regelmann, W. E. 1997; 155 (3): 984-989

    Abstract

    Because of conflicting data about hospital-based transmission of Burkholderia (Pseudomonas) cepacia, an important respiratory pathogen in cystic fibrosis (CF), we compared strains found in sputum, lung, or blood of 29 CF patients in our center from 1988 to 1994, studying the relationship between strain and hospital exposure of incident and that of prevalent cases. Exposure was defined as a concurrent hospital stay between a prevalent and an incident case. B. cepacia strains were determined by polymerase chain reaction (PCR) ribotyping and endonuclease subtyping. The 16S to 23S spacer regions of the bacterial ribosomal RNA (rRNA) genes were amplified by PCR, and the product-size patterns used to type each B. cepacia isolate. Endonuclease digestion of the PCR products provided length polymorphisms for subtyping. There were 17 incident events during the period from 1988 to 1994, 16 of which involved a single ribotype. These 16 ribotypes could be divided into five subtypes by endonuclease mapping. Four patients grew B. cepacia from the blood, with the organism being the same strain as found in the lung in each case. Case controls were obtained to evaluate risk factors for B. cepacia acquisition. Concurrent hospitalization with a prevalent case significantly increased the risk of acquisition. There was no association between length of hospitalization, length of exposure, or FEV1 and the risk of B. cepacia acquisition.

    View details for Web of Science ID A1997WN85700032

    View details for PubMedID 9117036

  • Glycemic response to dietary supplements in cystic fibrosis is dependent on the carbohydrate content of the formula JOURNAL OF PARENTERAL AND ENTERAL NUTRITION Milla, C., Doherty, L., Raatz, S., Schwarzenberg, S. J., Regelmann, W., Moran, A. 1996; 20 (3): 182-186

    Abstract

    Enteral formula feedings are frequently prescribed to cystic fibrosis (CF) patients to boost caloric intake. A substantial number of these patients are glucose intolerant and have severe respiratory compromise.To determine the effect of the carbohydrate content on glucose tolerance and respiratory function in glucose-intolerant CF patients with poor lung function, we examined the response to bolus feedings of five dietary supplements; a high-fat formula developed in our Clinical Research Center (CRC), Pulmocare, a high-carbohydrate formula developed in our CRC, Ensure Plus, and sugar-free Scandishake.Glucose excursion in response to the formulas with the lowest carbohydrate content was significantly less than that found in response to formulas with higher carbohydrate content. Insulin levels were also markedly lower in response to the low-carbohydrate high-fat formulas. Glucose excursion, expressed as a percent of the response to the CRC high-fat formula, was 111% +/- 12% for Pulmocare (p = NS), 202% +/- 34% for Ensure Plus (p < 01), 227% +/- 37% for CRC high carbohydrate (p = .001), and 357% +/- 33% for sugar-free Scandishake (p < .001). CO2 production, O2 consumption, minute ventilation, and respiratory rate increased modestly but not significantly in response to all formulas. No significant differences were found between the formulas in regards to these parameters. There were no subjective complaints of dyspnea during any of the five studies.The carbohydrate content of liquid dietary supplements appears to be an important determinant of hyperglycemia in glucose-intolerant adult CF patients.

    View details for Web of Science ID A1996UM63800003

    View details for PubMedID 8776690

  • Clinical significance of the recovery of Aspergillus species from the respiratory secretions of cystic fibrosis patients PEDIATRIC PULMONOLOGY Milla, C. E., Wielinski, C. L., Regelmann, W. E. 1996; 21 (1): 6-10

    Abstract

    The frequent recovery of Aspergillus species from the respiratory tract secretions of cystic fibrosis (CF) patients is well recognized, and the presence of the fungus in the airways may trigger an inflammatory response that can manifest as the clinical entity known as allergic bronchopulmonary aspergillosis (ABPA). In our CF patient population we studied the clinical characteristics of those who had Aspergillus sp. recovered from their respiratory tract secretions (n = 45) and compared them with the characteristics seen, during the same time period, in those patients who were culture negative for Aspergillus sp. (n = 167). There were no differences in peripheral blood eosinophil count (P = 0.9) or serum immunoglobulin E levels (P = 0.61). By logistic regression analysis there seemed to be an increased risk for more advanced lung disease, both radiographically (defined by a Brasfield chest radiograph score < 18) and by lung function parameters in those who were culture positive. However, after appropriate adjustment, almost all the increased risk was associated with age and gender, but not with the presence of Aspergillus sp. in respiratory secretions. Additionally, increasing age was strongly correlated with the risk of Aspergillus sp. being cultured from respiratory secretions (P = 0.0025). The presence of Aspergillus sp. in respiratory secretions was not associated with two indicators of atopy in our CF patient population. We do not have evidence that the culture of Aspergillus sp. from CF respiratory secretions is independently associated with an increased risk for more advanced lung disease.

    View details for Web of Science ID A1996TX83900003

    View details for PubMedID 8776259

  • HIGH-STRENGTH PANCREATIC-ENZYMES LANCET Milla, C. E., Wielinski, C. L., Warwick, W. J. 1994; 343 (8897): 599-599

    View details for Web of Science ID A1994MY84300041

    View details for PubMedID 7906348

Conference Proceedings


  • Trends in pulmonary function in patients with cystic fibrosis correlate with the degree of glucose intolerance at baseline Milla, C. E., Warwick, W. J., Moran, A. AMER THORACIC SOC. 2000: 891-895

    Abstract

    In patients with cystic fibrosis, CF-related diabetes mellitus (CFRD) has been associated with increased morbidity and mortality. Whether glucose intolerance is also associated with poor outcomes is unclear. To better define these relationships we prospectively followed a group of 152 patients with CF without diabetes for 4 yr. Patients were classified as having normal glucose tolerance (NGT), impaired glucose tolerance (IGT), or CFRD without fasting hyperglycemia (CFRD-No FH). FEV(1), FVC, and body mass index (BMI) were measured at baseline and quarterly. At baseline 45% of the patients had NGT, 38.8% had IGT, and 15.8% had CFRD-No FH. FEV(1), FVC, and BMI at baseline were comparable among these groups (all p > 0.1). After 4 yr an overall decline in FEV(1) and FVC occurred, with no change in BMI. The rates of decline for FEV(1) and FVC correlated with the glucose tolerance groups, with the highest rates of decline occurring among the CFRD-No FH group. In addition, patients in the lowest quartile for insulin production at baseline experienced the highest rates of pulmonary function decline over time, suggesting a relationship between insulin deficiency and clinical deterioration. We conclude that the degree of glucose intolerance is a strong determinant of future lung function decline in patients with CF.

    View details for Web of Science ID 000089363500024

    View details for PubMedID 10988101

  • Randomized, controlled trial of low-dose inhaled nitric oxide in the treatment of term and near-term infants with respiratory failure and pulmonary hypertension Cornfield, D. N., Maynard, R. C., deRegnier, R. A., Guiang, S. F., Barbato, J. E., Milla, C. E. AMER ACAD PEDIATRICS. 1999: 1089-1094

    Abstract

    Recent reports indicate that inhaled nitric oxide (iNO) causes selective pulmonary vasodilation, increases arterial oxygen tension, and may decrease the use of extracorporeal membrane oxygenation (ECMO) in infants with persistent pulmonary hypertension of the newborn (PPHN). Despite these reports, the optimal dose and timing of iNO administration in PPHN remains unclear.To test the hypotheses that in PPHN 1) iNO at 2 parts per million (ppm) is effective at acutely increasing oxygenation as measured by oxygenation index (OI); 2) early use of 2 ppm of iNO is more effective than control (0 ppm) in preventing clinical deterioration and need for iNO at 20 ppm; and 3) for those infants who fail the initial treatment protocol (0 or 2 ppm) iNO at 20 ppm is effective at acutely decreasing OI.A randomized, controlled trial of iNO in 3 nurseries in a single metropolitan area. Thirty-eight children, average gestational age of 37.3 weeks and average age <1 day were enrolled. Thirty-five of 38 infants had echocardiographic evidence of pulmonary hypertension. On enrollment, median OI in the control group, iNO at 0 ppm, (n = 23) was 33.1, compared with 36.9 in the 2-ppm iNO group (n = 15).Initial treatment with iNO at 2 ppm for an average of 1 hour was not associated with a significant decrease in OI. Twenty of 23 (87%) control patients and 14 of 15 (92%) of the low-dose iNO group demonstrated clinical deterioration and were treated with iNO at 20 ppm. In the control group, treatment with iNO at 20 ppm decreased the median OI from 42.6 to 23.8, whereas in the 2-ppm iNO group with a change in iNO from 2 to 20 ppm, the median OI did not change (42.6 to 42.0). Five of 15 patients in the low-dose nitric oxide group required ECMO and 2 died, compared with 7 of 23 requiring ECMO and 5 deaths in the control group.In infants with PPHN, iNO 1): at 2 ppm does not acutely improve oxygenation or prevent clinical deterioration, but does attenuate the rate of clinical deterioration; and 2) at 20 ppm acutely improves oxygenation in infants initially treated with 0 ppm, but not in infants previously treated with iNO at 2 ppm. Initial treatment with a subtherapeutic dose of iNO may diminish the clinical response to 20 ppm of iNO and have adverse clinical sequelae.

    View details for Web of Science ID 000083448000007

    View details for PubMedID 10545552

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