Physician Photo

Thoralf M. (Thor) Sundt, III, MD

Chief, Division of Cardiac Surgery

Director, Corrigan Minehan Heart Center

As chief of Cardiac Surgery, Dr. Sundt performs the full range of adult cardiac surgical procedures. He is also dedicated to assuring the highest quality care by the entire cardiac surgical team in a patient-centered, efficient, and safe manner.

  • Phone: 617-643-9745
Cardiac Surgery
Department of Surgery


  • Heart Center
  • Cardiac Surgery
  • Transplant Center
  • Heart Transplant
Clinical Interests
Mitral Valve repair
Aortic valve repair and replacement
Surgery of the aortic root and aortic arch
Surgery of descending thoracic and thoracoabdominal aorta
Complete arterial grafting for coronary artery disease
Pulmonary thromboendarterectomy
Boston: Massachusetts General Hospital
Medical Education
MD, Johns Hopkins University School of Medicine
Residency, Massachusetts General Hospital
Residency, Washington University School of Medicine
Fellowship, Harefield Hospital
Fellowship, National Cancer Institute
Board Certifications
Thoracic Surgery (Cardiothoracic Vascular Surgery), American Board of Thoracic Surgery
Patient Age Group
Accepting New Patients

BiographyUndergraduate education, Princeton University with BA in Biochemistry Summa cum Laude 1979
Medical School, Johns Hopkins School of Medicine
General Surgery Residency, Massachusetts general Hospital
Research fellowship in Transplantation Immunology, National Institutes of Health
Thoracic Surgery Residency, Washington University in St. Louis
Advanced fellowship in Cardiac Surgery and Transplantation, Harefield Hospital, Harefield United Kingdom
Staff in Cardiac Surgery, Washington University in St. Louis 1994-2001
    Director Thoracic Aortic Center
    Director Heart/Heart-Lung transplantation
Staff in Cardiovascular Surgery, Mayo Clinic 2001-2011
    Co-Director Marfan and Thoracic Aortic Clinic
    Vice-chair Department of Surgery

Current Appointments:
Chief of Cardiac Surgery, Massachusetts General Hospital
Edward D. Churchill Professor of Surgery, Harvard Medical School
Director, Corrigan Minehan Heart Center


The focus of my research has been on the genetics and clinical aspects of aneurysmal disease associated with bicuspid aortic valve.  In addition my research team has explored fundamental aspects of medical error with a particular emphasis on Human Factors and communication.

Mass General Chief of Cardiac Surgery Discusses Choice Among Valve Prostheses

Thor Sundt, MD, chief of cardiac surgery and director of the Corrigan Minehan Heart Center, talks about heart valve options for patients undergoing heart valve surgery.

Chief of Cardiac Surgery named

MGH Hotline 02.04.11 THORALF M. SUNDT III, MD, has been named chief of the Division of Cardiac Surgery.

New chief of Cardiac Surgery ready for impact

The Division of Cardiac Surgery at Mass General welcomes new chief. Thoralf M. Sundt III, MD, bridges legacy of surgical practice and passion for new ideas to improve upon the patient experience.

Integrated Model Speeds Understanding of Atrial Fibrillation and Stroke

The Mass General Institute for Heart, Vascular, and Stroke Care integrates services to accelerate advances in stroke-related atrial fibrillation research and patient care.

Collaborative caring

To introduce the Institute of Heart, Vascular and Stroke Care to the MGH community, “Health Information Day” will be held Sept. 12 from 7 am to 8 pm under the Bulfinch Tents.

Novel Therapeutic Strategies for Systemic Cardiovascular Disease

Experts from the Massachusetts General Hospital Institute for Heart, Vascular and Stroke Care present a dynamic symposium on systemic cardiovascular disease.

Collaboration at the heart of patient care

The collaborative care at Massachusetts General Hospital saved Julie Meyerholz when she suffered an ascending aortic dissection in the middle of a storm.

Celebrating survival

12 cardiac patients with MGH Cardiac Surgery clinicians from the extracorporeal membrane oxygenation program came together for a reunion at the Paul S. Russell, MD Museum of Medical History and Innovation.

Advanced Technologies: When, Who, Why? Patient Selection to Optimize Therapeutic Outcomes

Experts from the Massachusetts General Hospital Institute for Heart, Vascular and Stroke Care present their experience and provide a practical guide to clinical decision making for patients with heart failure, pulmonary embolism and cardiogenic stroke.

Massachusetts General Hospital offers specialized operation to remove chronic blood clots from pulmonary arteries

Massachusetts General Hospital offers pulmonary thromboendarterectomy (PTE), a highly specialized operation to remove chronic blood clots in the lungs. Without surgery, patients who have this life-threatening disease will likely develop progressive shortness of breath so severe that it leads to heart failure.

Cardiac Surgery
55 Fruit Street
Boston, MA 02114-2696

Phone: 617-643-9745
Phone 2: 617-724-0800
Fax: 617-726-5804