James S. Tweddell, MD

Executive Co-Director, Heart Institute

Director, Cardiothoracic Surgery, Heart Institute

Academic Affiliations

Professor, UC Department of Surgery

Phone 513-803-8824

Email james.tweddell@cchmc.org


Surgical emphases include congenital heart surgery in neonates, infants, children, teenagers and adults. Heart transplantation and mechanical circulatory support.


Developing reliable and reproducible evidence-based perioperative management strategies to improve survival and developmental outcomes; novel monitoring techniques such as continuous venous oximetry and near infrared spectroscopy. 

Dr. Tweddell leads the Heart Institute’s surgical team providing unparalleled surgical care and innovation for our patients and their families. Over the last 20 years, he built the pediatric cardiothoracic surgery program at the Medical College of Wisconsin, where he held the S. Bert Litwin Chair for Cardiothoracic Surgery position, served as medical director of pediatric cardiothoracic surgery at Children’s Hospital of Wisconsin and professor and chief for the Division of Cardiothoracic Surgery. Dr. Tweddell has an extensive list of vital research contributions, having authored more than 125 peer reviewed articles, published numerous books, chapters, invited reviews and editorials, and serving on multiple editorial boards and national committees.

Dr. Tweddell is the elite surgeon of his generation and has earned a worldwide reputation for outstanding clinical results based on team contributions to his outcomes. He decreased mortality following the Norwood procedure through the use of venous saturation monitoring and afterload reduction. In addition, Dr. Tweddell reduced interstage mortality of a single ventricle patient through the development of a home monitoring program.

MD: University of Cincinnati, Cincinnati, OH, 1985.

Residency: Intern and Second Year Resident in General Surgery, New York Medical Center, New York, NY, 1987.

Residency: Research Fellow in Cardiothoracic Surgery, Washington University Medical Center, St. Louis, MO, 1989.

Residency: Senior Resident and Chief Resident in General Surgery, Washington University Medical Center, St. Louis, MO, 1991.

Residency: Resident in Cardiothoracic Surgery, Washington University Medical Center, St. Louis, MO, 1993.

Fellowship: Fellow in Pediatric Cardiothoracic Surgery, Washington University Medical Center, St. Louis, MO, 1993.

View PubMed Publications

Jacobs JP, O'Brien SM, Pasquali SK, Gaynor JW, Mayer JE Jr, Karamlou T, Welke KF, Filardo G, Han JM, Kim S, Quintessenza JA, Pizarro C, Tchervenkov CI, Lacour-Gayet F, Mavroudis C, Backer CL, Austin EH 3rd, Fraser CD, Tweddell JS, Jonas RA, Edwards FH, Grover FL, Prager RL, Shahian DM, Jacobs ML. The Society of Thoracic Surgeons Congenital Heart Surgery Database Mortality Risk Model: Part 2-Clinical Application. Ann Thorac Surg. 2015 Aug 3.

Tweddell JS. The Atrial Level Switch Operation: Lessons Old and New. Circulation. 2015 Jul 16.

Niebler RA, Shah TK, Mitchell ME, Woods RK, Zangwill SD, Tweddell JS, Berger S, Ghanayem NS. Ventricular Assist Device in Single-Ventricle Heart Disease and a Superior Cavopulmonary Anastomosis. Artif Organs. 2015 Jul 6.

Jacobsen RM, Earing MG, Hill GD, Barnes M, Mitchell ME, Woods RK, Tweddell JS. The Externally Supported Ross Operation: Early Outcomes and Intermediate Follow-Up. Ann Thorac Surg. 2015 Aug;100(2):631-8.

Ginde S, Lam J, Hill GD, Cohen S, Woods RK, Mitchell ME, Tweddell JS, Earing MG. Long-term outcomes after surgical repair of complete atrioventricular septal defect. J Thorac Cardiovasc Surg. 2015 Aug;150(2):369-74.

Buelow MW, Earing MG, Hill GD, Cohen SB, Bartz PJ, Tweddell JS, Ginde S. Tricuspid repair at pulmonary valve replacement does not alter outcomes in tetralogy of Fallot. Ann Thorac Surg. 2015 Mar;99(3):899-904.

Cox DA, Ginde S, Tweddell JS, Earing MG. Outcomes of a hepatitis C screening protocol in at-risk adults with prior cardiac surgery. World J Pediatr Congenit Heart Surg. 2014 Oct;5(4):503-6.

Samyn MM, Plymale JM, Cousineau AJ, Tweddell JS. TAPVR in a kindergartner presenting with fatigue. BMJ Case Rep. 2014 Oct 9;2014.

McCrindle BW, Li JS, Manlhiot C, Tweddell JS, Giglia TM, Massicotte MP, Monagle P, Krishnamurthy R, Mahaffey KW, Michelson AD, Verdun N, Almond CS, Newburger JW, Brandão LR, Esmon CT, Manco-Johnson MJ, Ichord R, Ortel TL, Chan AK, Portman R, Rose M, Strony J, Kaltman JR. Challenges and priorities for research: a report from the National Heart, Lung, and Blood Institute (NHLBI)/National Institutes of Health (NIH) Working Group on thrombosis in pediatric cardiology and congenital heart disease. Circulation. 2014 Sep 30;130(14):1192-203.

Mitchell ME, Rumman N, Chun RH, Rao A, Martin T, Beste DJ, Berens RJ, Parakininkas DE, Ghanayem NS, Hubert MJ, Uhing M, Simpson P, Sato TT, Tweddell JS, Kerschner JE. Anterior tracheal suspension for tracheobronchomalacia in infants and children. Ann Thorac Surg. 2014 Oct;98(4):1246-53.

PumpKIN Trial. Principal Surgical Investigator. National Institutes of Health. 2013-ongoing.

Targeted, Highly Sensitive, Non-Invasive Cardiac Transplant Rejection Monitoring. Co-Principal Investigator. National Institutes of Health. 2013-2018.

Berlin Heart Post Approval Study. Co-Principal Investigator. Berlin Heart Inc. Aug 2013-ongoing.