Joshua Hermsen, MD

Assistant Professor

  • Section of Pediatric Cardiothoracic Surgery
  • Division of Cardiothoracic Surgery


  • MD, Medical University of South Carolina, 2004
  • General Surgery Residency, University of Wisconsin Madison, Madison, WI
  • Cardiothoracic Surgery Fellowship, University of Washington Medical Center, Seattle, WA
  • Congenital Cardiac Surgery Fellowship, Seattle Children’s Hospital, Seattle, WA

Clinical Specialties

Dr. Hermsen specializes in the care of patients of all ages with congenital heart disease ranging from repairs in the neonatal period to multiple re-do operations and transplants in adult patients of all ages. He also has interest and expertise in treating patients with hypertrophic cardiomyopathy complicated by obstruction of the left ventricular outflow tract, mitral valve problems and heart rhythm problems. He also has extensive experience in treating patients with congenital and acquired heart disease complicated by infectious endocarditis.

Research Interests

Dr. Hermsen’s research interests focus on demonstrating utility of medical 3D printing related to septal myectomy surgery, cardiomyopathy, and examining the effects of using cardiac surgical simulation for resident education.

Recent Publications

  • We Agree: Cardiopulmonary Bypass is a Team Sport.
    Fiedler AG, Lewis EE, Hermsen JL
    Ann. Thorac. Surg. 2020 Apr 23;
    [PubMed ID: 32335018]

  • Cardiothoracic Education in the Time of COVID-19: How I Teach It.
    Lewis EE, Taylor LJ, Hermsen JL, McCarthy DP, Fiedler AG
    Ann. Thorac. Surg. 2020 Apr 10;
    [PubMed ID: 32283082]

  • Beyond 30 Days: Analysis of Unplanned Readmissions During the First Year Following Congenital Heart Surgery.
    Lushaj EB, Hermsen J, Leverson G, MacLellan-Tobert SG, Nelson K, Amond K, Anagnostopoulos PV
    World J Pediatr Congenit Heart Surg 2020 Mar; 11(2): 177-182
    [PubMed ID: 32093562]

  • Three-dimensional printing in congenital heart disease.
    Hermsen JL, Roldan-Alzate A, Anagnostopoulos PV
    J Thorac Dis 2020 Mar; 12(3): 1194-1203
    [PubMed ID: 32274200]

  • Cardiopulmonary Bypass: How I Teach It.
    Fiedler AG, Lewis EE, Hermsen JL
    Ann. Thorac. Surg. 2020 03; 109(3): 645-648
    [PubMed ID: 31954688]

All Publications on PubMed