Clinical Focus

  • Anesthesia

Academic Appointments

Administrative Appointments

  • Director of Regional Anesthesia, Oregon Health Science University (2003 - 2013)
  • Chief, Division of Regional Anesthesia, Stanford University (2013 - Present)

Honors & Awards

  • Medical/Professional Staff Chairman?s Award for Outstanding Contributions in Clinical Care Quality, Oregon Health & Science University (November 26, 2006)
  • Outstanding Teacher Award, CA2, Department of Anesthesiology, Oregon Health & Science University (2003)
  • Outstanding Teacher Award, CA3, Department of Anesthesiology, Oregon Health & Science University (2003)
  • Outstanding Teacher Award, Department of Anesthesiology, Oregon Health & Science University (2001)

Professional Education

  • Fellowship:Vanderbilt University Medical Center (1996) TN
  • Board Certification: Anesthesia, Medecin Specialiste en Anesthesiologie (1991)
  • Residency:Cliniques Universitaire St Luc (1990) Belgium
  • Medical Education:Catholic University of Louvain (1986) Belgium
  • MD, Université Catholique de Louvain (UCL) Brussels, Belgium (1986)


2019-20 Courses

Graduate and Fellowship Programs


All Publications

  • Opioid-Free Ultra-Fast-Track On-Pump Coronary Artery Bypass Grafting Using Erector Spinae Plane Catheters. Journal of cardiothoracic and vascular anesthesia Chanowski, E. J., Horn, J., Boyd, J. H., Tsui, B. C., Brodt, J. L. 2018

    View details for PubMedID 30424939

  • Perioperative Pain Management for Total Knee Arthroplasty: Need More Focus on the Forest and Less on the Trees. Anesthesiology Webb, C. A., Madison, S., Goodman, S. B., Mariano, E. R., Horn, J. L. 2018; 128 (2): 420?21

    View details for PubMedID 29337751

  • Cervical erector spinae plane block catheter using a thoracic approach: an alternative to brachial plexus blockade for forequarter amputation. Canadian journal of anaesthesia = Journal canadien d'anesthesie Tsui, B. C., Mohler, D., Caruso, T. J., Horn, J. L. 2018

    View details for PubMedID 29868941

  • Transversus Abdominis Plane Block and Free Flap Abdominal Tissue Breast Reconstruction Is There a True Reduction in Postoperative Narcotic Use? ANNALS OF PLASTIC SURGERY Hunter, C., Shakir, A., Momeni, A., Luan, A., Steffel, L., Horn, J., Dung Nguyen, D., Lee, G. K. 2017; 78 (3): 254-259


    The use of the transversus abdominis plane (TAP) block is increasing in abdominally based autologous tissue breast reconstruction as a method to provide postoperative donor site analgesia. The purpose of this study was to evaluate the efficacy of the TAP block in the immediate postoperative period.A retrospective analysis of all patients who underwent autologous microsurgical breast reconstruction over a 2-year period (2013-2015) was conducted. Only patients with an abdominal donor site were included. Patients were grouped based on the presence or absence of TAP blocks. Primary endpoints included patient-reported pain score, daily and total narcotic use during the hospitalization, antiemetic use, as well as complications.We identified 40 patients that had undergone abdominal-based free flap breast reconstruction and TAP block catheter placement for postoperative analgesia that met inclusion criteria. This group was then compared with a matched cohort of 40 patients without TAP blocks. There were no complications associated with using the TAP catheters. There was no statistically significant difference in postoperative pain scores, daily or total narcotic use during the hospitalization, or antiemetic use between the 2 groups. Although not statistically significant, linear regression analysis identified trends of improved donor site analgesia in select groups, such as unilateral immediate reconstructions, body mass index greater than 30 kg/m, and those without abdominal mesh placed at the time of donor site closure in the TAP block group.Constant delivery of local anesthetic through the TAP block appears to be safe; however, it did not reduce narcotic requirements or postoperative pain scores in patients undergoing abdominal-based free flap breast reconstruction.

    View details for DOI 10.1097/SAP.0000000000000873

    View details for Web of Science ID 000394386700004

  • Reply to Dr El-Boghdadly et al. Regional anesthesia and pain medicine Horn, J., Derby, R., Abrahams, M. 2016; 41 (5): 655-?

    View details for DOI 10.1097/AAP.0000000000000449

    View details for PubMedID 27547904

  • Quadratus lumborum catheters for breast reconstruction requiring transverse rectus abdominis myocutaneous flaps JOURNAL OF ANESTHESIA Spence, N. Z., Olszynski, P., Lehan, A., Horn, J., Webb, C. A. 2016; 30 (3): 506-509


    Patients diagnosed with breast cancer may opt to undergo surgical reconstructive flaps at the time of or after mastectomies. These surgeries leave patients with significant postoperative pain and sometimes involve large surgical beds including graft sites from the abdomen to reconstruct the breast. Consequently, multimodal methods of pain management have become highly favored. Quadratus lumborum catheters offer an opioid-sparing technique that can be performed easily and safely. We present a case of a patient who underwent a breast flap reconstruction and had bilateral quadratus lumborum catheters placed for perioperative pain control.

    View details for DOI 10.1007/s00540-016-2160-y

    View details for Web of Science ID 000376675600021

    View details for PubMedID 26984687

  • The Importance of the Saphenous Nerve in Ankle Surgery ANESTHESIA AND ANALGESIA Eglitis, N., Horn, J., Benninger, B., Nelsen, S. 2016; 122 (5): 1704-1706


    Recent evidence suggests that the saphenous nerve may be involved in the innervation of deeper structures at the medial ankle. In this study, we sought to determine the consistency and variability of the saphenous nerve innervation at the distal tibia and medial ankle joint capsule.One hundred three lower extremities from 52 embalmed cadavers were dissected to identify the deep branches of saphenous nerve along its distal course.In all specimens, the saphenous nerve had branches, emerging between 3.9 and 8.2 cm above the medial malleolus, to the periosteum of the distal tibia and the medial capsule of the ankle joint.Deep branches of the saphenous nerve innervate the periosteum of the distal tibia and talocrural capsule.

    View details for DOI 10.1213/ANE.0000000000001168

    View details for Web of Science ID 000374664400065

    View details for PubMedID 26859876

  • Update on Ultrasound for Truncal Blocks: A Review of the Evidence. Regional anesthesia and pain medicine Abrahams, M., Derby, R., Horn, J. 2016; 41 (2): 275-288


    We summarized the evidence for ultrasound (US) guidance for truncal blocks in 2010 by performing a systematic literature review and rating the strength of evidence for each block using a system developed by the United States Agency for Health Care Policy and Research. Since then, numerous studies of US guidance for truncal blocks have been published. In addition, 3 novel US-guided blocks have been described since our last review. To provide updated recommendations, we performed another systematic search of the literature to identify studies pertaining to US guidance for the following blocks: paravertebral, intercostal, transversus abdominis plane, rectus sheath, ilioinguinal/iliohypogastric, as well as the Pecs, quadratus lumborum, and transversalis fascia blocks. We rated the methodologic quality of each of the identified studies and then graded the strength of evidence supporting the use of US for each block based on the number and quality of available studies for that block.Since our last review, numerous studies have been published, especially for the paravertebral and transversus abdominis plane blocks, and 3 novel US-guided blocks (Pecs, quadratus lumborum, and transversalis fascia blocks) have been described. Although some of these studies support the use of US for performing these blocks, others do not. Additional studies have used US to improve our understanding of the anatomy pertinent to these blocks and evaluated the effect on patient outcomes and risk of complications.

    View details for DOI 10.1097/AAP.0000000000000372

    View details for PubMedID 26866299

  • The Second American Society of Regional Anesthesia and Pain Medicine Evidence-Based Medicine Assessment of Ultrasound-Guided Regional Anesthesia: Executive Summary. Regional anesthesia and pain medicine Neal, J. M., Brull, R., Horn, J., Liu, S. S., McCartney, C. J., Perlas, A., Salinas, F. V., Tsui, B. C. 2016; 41 (2): 181-194


    In 2009 and again in 2012, the American Society of Regional Anesthesia and Pain Medicine assembled an expert panel to assess the evidence basis for ultrasound guidance as a nerve localization tool for regional anesthesia.The 2012 panel reviewed evidence from the first advisory but focused primarily on new information that had emerged since 2009. A new section was added regarding the accuracy and reliability of ultrasound for determining needle-to-nerve proximity. Jadad scores are used to rank study quality. Grades of recommendations consistent with their level of evidence are provided.The panel offers recommendations based on synthesis and analysis of literature related to (1) the technical capabilities of ultrasound equipment and its operators, (2) comparison of ultrasound to other methods of nerve localization with regard to block characteristics, (3) comparison of block techniques where ultrasound is the sole nerve localization modality, and (4) major complications. Assessment of evidence strength and recommendations are made for upper- and lower-extremity, truncal, neuraxial, and pediatric blocks.Scientific evidence from the past 5 years has clarified and strengthened our understanding of ultrasound-guided regional anesthesia as a nerve localization tool. High-level evidence supports ultrasound guidance contributing to superior characteristics with selected blocks, although absolute differences with the comparator technique are often relatively small (especially for upper-extremity blocks). The clinical meaningfulness of these differences is likely of variable importance to individual practitioners. The use of ultrasound significantly reduces the risk of local anesthetic systemic toxicity as well as the incidence and intensity of hemidiaphragmatic paresis, but has no significant effect on the incidence of postoperative neurologic symptoms. WHAT'S NEW IN THIS UPDATE?: This evidence-based assessment of ultrasound-guided regional anesthesia reviews findings from our 2010 publication and focuses on new meta-analyses, randomized controlled trials, and large case series published since 2009. New to this exercise is an in-depth analysis of the accuracy and reliability of ultrasound guidance for identifying needle-to-nerve relationships. This version no longer addresses ultrasound for interventional pain medicine procedures, because the growth of that field demands separate consideration. Since our 2010 publication, new information has either supported or strengthened our original conclusions. There is no evidence that ultrasound is inferior to alternative nerve localization methods.

    View details for DOI 10.1097/AAP.0000000000000331

    View details for PubMedID 26695878

  • Development and Validation of an Assessment of Regional Anesthesia Ultrasound Interpretation Skills. Regional anesthesia and pain medicine Woodworth, G. E., Carney, P. A., Cohen, J. M., Kopp, S. L., Vokach-Brodsky, L. E., Horn, J. E., Missair, A., Banks, S. E., Dieckmann, N. F., Maniker, R. B. 2015; 40 (4): 306-314


    Interpretation of ultrasound images and knowledge of anatomy are essential skills for ultrasound-guided peripheral nerve blocks. Competency-based educational models promoted by the Accreditation Council for Graduate Medical Education require the development of assessment tools for the achievement of different competency milestones to demonstrate the longitudinal development of skills that occur during training.A rigorous study guided by psychometric principles was undertaken to identify and validate the domains and items in an assessment of ultrasound interpretation skills for regional anesthesia. A survey of residents, academic faculty, and community anesthesiologists, as well as video recordings of experts teaching ultrasound-guided peripheral nerve blocks, was used to develop short video clips with accompanying multiple choice-style questions. Four rounds of pilot testing produced a 50-question assessment that was subsequently administered online to residents, fellows, and faculty from multiple institutions.Test results from 90 participants were analyzed with Item Response Theory model fitting indicating that a 47-item subset of the test fits the model well (P = 0.11). There was a significant linear relation between expected and predicted item difficulty (P < 0.001). Overall test scores increased linearly with higher levels of formal anesthesia training, regional anesthesia training, number of ultrasound-guided blocks performed per year, and a self-rating of regional anesthesia skill (all P < 0.001).This study provides evidence for the reliability, content validity, and construct validity of a 47-item multiple choice-style online test of ultrasound interpretation skills for regional anesthesia, which can be used as an assessment of competency milestone achievement in anesthesiology training.

    View details for DOI 10.1097/AAP.0000000000000236

    View details for PubMedID 26017720

  • Regional anesthesia for vascular surgery. Anesthesiology clinics Flaherty, J., Horn, J., Derby, R. 2014; 32 (3): 639-659


    Patients presenting for vascular surgery present a challenge to anesthesiologists because of their severe systemic comorbidities. Regional anesthesia has been used as a primary anesthetic technique for many vascular procedures to avoid the cardiovascular and pulmonary perturbations associated with general anesthesia. In this article the use of regional anesthesia for carotid endarterectomy, open and endovascular abdominal aortic aneurysm repair, infrainguinal arterial bypass, lower extremity amputation, and arteriovenous fistula formation is described. A focus is placed on reviewing the literature comparing anesthetic techniques, with brief descriptions of the techniques themselves.

    View details for DOI 10.1016/j.anclin.2014.05.002

    View details for PubMedID 25113725

  • Efficacy of computer-based video and simulation in ultrasound-guided regional anesthesia training. Journal of clinical anesthesia Woodworth, G. E., Chen, E. M., Horn, J. E., Aziz, M. F. 2014; 26 (3): 212-221


    To determine the effectiveness of a short educational video and simulation on improvement of ultrasound (US) image acquisition and interpretation skills.Prospective, randomized study.University medical center.28 anesthesia residents and community anesthesiologists with varied ultrasound experience were randomized to teaching video with interactive simulation or sham video groups.Participants were assessed preintervention and postintervention on their ability to identify the sciatic nerve and other anatomic structures on static US images, as well as their ability to locate the sciatic nerve with US on live models.Pretest written test scores correlated with reported US block experience (Kendall tau rank r = 0.47) and with live US scanning scores (r = 0.64). The teaching video and simulation significantly improved scores on the written examination (P < 0.001); however, they did not significantly improve live US scanning skills.A short educational video with interactive simulation significantly improved knowledge of US anatomy, but failed to improve hands-on performance of US scanning to localize the nerve.

    View details for DOI 10.1016/j.jclinane.2013.10.013

    View details for PubMedID 24793714

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