Derrick is a fourth year resident in cardiac surgery at the University of Toronto. His clinical interests include both minimally invasive valve surgery and transcatheter valve interventions. His academic interests include observational research design using large administrative datasets, health economics and economic evaluation, artificial intelligence, and outcomes research.

He completed his PhD in 2020 in Health Services Research under the supervision of Dr. Stephen Fremes and his doctoral training was supported by a Canadian Institute for Health Research Fellowship Award.

He has published over 100 manuscripts, three textbook chapters, and developed an iOS/Android App ( that is freely available for download to predict readmission after discharge from cardiac surgery.


    • Postgraduate Year Four, Cardiac Surgery, University of Toronto (2014 - Present)
    • Doctor of Philosophy, Health Technology Assessment, Institute for Health Policy, Management, and Evaluation, University of Toronto, Health Services Research Program (2016-2020), PhD
    • Doctor of Medicine, Queen’s University (2010 - 2014), MD
    • Honours Bachelor of Science, Pharmacology and Toxicology, University of Toronto (2005 - 2010), BSc

    Clinical Interests

    - Aortic valve surgery

    - Minimally invasive cardiac surgery

    - Structural heart interventions

    - Conduits in coronary surgery

    Research Interests

    Derrick’s doctoral research on trends and outcomes in aortic valve replacement in the era of transcatheter aortic valve replacement, utilizing large administrate databases from the United States (STS National Database) and those in Canada (Institute for Clinical and Evaluative Sciences). He has an interest in statistical methods and a strong focus on decision analysis modeling and cost-effectiveness modeling. He hopes his research will impact clinical decision making at both the patient level and at the policy level.



    Canadian Cardiovascular Society – C3I, COVID-19 Research Challenge Grant 2020

    Dr. Paul Cartier Resident Research Award, Canadian Cardiovascular Congress 2019, Montreal, Canada

    Canadian Institutes for Health Research (CIHR) Fellowship Award (2018 - 2021)

    Paul C. Samson Resident Essay Prize, The Western Thoracic Surgical Association, 43rd Annual Meeting, Colorado Springs, Colorado. 

    Sunnybrook Education Advisory Council (SEAC) 2017 Education Research and Scholarship Grant, Sunnybrook Health Sciences Centre, Toronto, Canada,

    Bayer Vascular Award, Resident Research Competition, Canadian Cardiovascular Congress, October 2016

    Health Services Research Award, Resident Competition, Physicians’ Services Incorporated Foundation, Ontario, October 2015


    Full publication list available on PubMed:


    Tam DY, Wijeysundera HC, Naimark D, Gaudino M, Webb JG, Cohen DJ, Fremes SE. Impact of Transcatheter Aortic Valve Durability on Life Expectancy in Low Risk Patients with Severe Aortic Stenosis. Circulation. 2020;374:1609.

    Tam DY, Dharma C, Rocha R, Farkouh ME, Abdel-Qadir H, Sun LY, Wijeysundera HC, Austin PC, Udell JA, Gaudino M, Fremes SE, Lee DS. Long-Term Survival After Surgical or Percutaneous Revascularization in Patients With Diabetes and Multivessel Coronary Disease. J Am Coll Cardiol. 2020;76:1153–1164.

    Tam DY, Dharma C, Rocha RV, Austin PC, Wijeysundera HC, Farkouh M, Gaudino M, Sadat S, Lee DS, Fremes SE. Revascularization Strategies for the Treatment of Multivessel Coronary Artery Disease in Patients With Diabetes Mellitus. Circ Cardiovasc Interv. 2020;367:CIRCINTERVENTIONS120009082.

    Tam DY, Dharma C, Rocha RV, Ouzounian M, Wijeysundera HC, Austin PC, Chikwe J, Gaudino M, Fremes SE. Transcatheter ViV Versus Redo Surgical AVR for the Management of Failed Biological Prosthesis: Early and Late Outcomes in a Propensity-Matched Cohort. JACC Cardiovasc Interv. 2020;13:765–774.

    Tam DY, Rocha RV, Fang J, Ouzounian M, Chikwe J, Lawton J, Ko DT, Austin PC, Gaudino M, Fremes SE. Multiple arterial coronary bypass grafting is associated with greater survival in women. Heart. 2020 Oct 20;378:heartjnl–2020–317737.



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  • Chair: Dr. Terrence Yau
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