Joshua Hermsen, MD

Associate Professor

  • Section of Pediatric Cardiothoracic Surgery
  • Division of Cardiothoracic Surgery
(608) 262-3858


  • MD, Medical University of South Carolina
  • 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

  • Surgically induced aortic coarctation in a neonatal porcine model allows for longitudinal assessment of cardiovascular changes.
    Stellon M, Gober L, Culver MA, Hermsen J, Irrer D, Witzenburg C, Roldán-Alzate A, Lamers L
    Am J Physiol Heart Circ Physiol 2024 May 01; 326(5): H1117-H1123
    [PubMed ID: 38488518]

  • Congenital absence of tracheal rings: A video case report.
    Angeles C, Kille T, Hermsen JL, DeCamp MM, Anagnostopoulos PV
    JTCVS Tech 2023 Oct; 21: 184-187
    [PubMed ID: 37854825]

  • Wolff-Parkinson-White pattern in the setting of antibody-mediated rejection after heart transplant.
    Chong L, Waqar A, Elkhouly A, Hermsen J, Johnson M, Wright J
    HeartRhythm Case Rep 2023 Sep; 9(9): 649-652
    [PubMed ID: 37746570]

  • Association of Size Matching Using Predicted Heart Mass With Mortality in Heart Transplant Recipients With Obesity or High Pulmonary Vascular Resistance.
    Tao R, Hess TM, Kuchnia A, Hermsen J, Raza F, Dhingra R
    JAMA Netw Open 2023 Jun 01; 6(6): e2319191
    [PubMed ID: 37351886]

  • Systems of Care Factors Should Be Considered in Regionalization of Congenital Cardiac Surgery.
    Anagnostopoulos PV, Cartmill RS, Yang Q, Schumacher JR, Fernandes-Taylor S, Hermsen JL, DeCamp MM
    Ann Thorac Surg 2023 Sep; 116(3): 517-523
    [PubMed ID: 36379268]

All Publications on PubMed