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

  • Pulmonary artery and lung parenchymal growth following early versus delayed stent interventions in a swine pulmonary artery stenosis model.
    Pewowaruk R, Hermsen J, Johnson C, Erdmann A, Pettit K, Aesif S, Ralphe JC, Francois CJ, Roldán-Alzate A, Lamers L
    Catheter Cardiovasc Interv 2020 Dec; 96(7): 1454-1464
    [PubMed ID: 33063918]

  • Distinct hypertrophic cardiomyopathy genotypes result in convergent sarcomeric proteoform profiles revealed by top-down proteomics.
    Tucholski T, Cai W, Gregorich ZR, Bayne EF, Mitchell SD, McIlwain SJ, de Lange WJ, Wrobbel M, Karp H, Hite Z, Vikhorev PG, Marston SB, Lal S, Li A, Dos Remedios C, Kohmoto T, Hermsen J, Ralphe JC, Kamp TJ, Moss RL, Ge Y
    Proc Natl Acad Sci U S A 2020 10 06; 117(40): 24691-24700
    [PubMed ID: 32968017]

  • Multimodal Cardiopulmonary Bypass Skills Assessment Within a High-Fidelity Simulation Environment.
    Hermsen JL, Mohamadipanah H, Yang S, Wise B, Fiedler A, DiMusto P, Pugh C
    Ann Thorac Surg 2020 Sep 21;
    [PubMed ID: 32971063]

  • Prophylactic Peritoneal Drainage is Associated with Improved Fluid Output after Congenital Heart Surgery.
    Pettit KA, Schreiter NA, Lushaj EB, Hermsen JL, Wilhelm M, Mahon ACR, Nelson KL, DeGrave JJ, Marka N, Anagnostopoulos PV
    Pediatr Cardiol 2020 Dec; 41(8): 1704-1713
    [PubMed ID: 32734528]

  • Heart and kidney transplant: should they be combined or subsequent?
    Melvinsdottir I, Foley DP, Hess T, Gunnarsson SI, Kohmoto T, Hermsen J, Johnson MR, Murray D, Dhingra R
    ESC Heart Fail 2020 10; 7(5): 2734-2743
    [PubMed ID: 32608197]

All Publications on PubMed