Ron Wald




Ron Wald is a nephrologist at St. Michael’s Hospital and Director of the hospital’s Hemodialysis Program. He is a Professor of Medicine at the University of Toronto. A native of Montreal, he completed his undergraduate and medical degrees at McGill University and continued his clinical training in internal medicine and nephrology at the University of Toronto. Following this, he completed his Master of Public Health at Harvard University and a research fellowship at Tufts Medical Center in Boston. Dr. Wald’s research areas are critical care nephrology and maintenance dialysis. He was co-principal investigator of the STARRT-AKI trial, a Canadian Institutes of Health Research-funded international trial on the timing of dialysis initiation in critically ill patients with acute kidney injury. He is also interested in fluid management in the setting of acute kidney injury and the long-term outcomes of patients who survive an episode of acute kidney injury. In the realm of maintenance dialysis, he is on the leadership team of the multinational PHOSPHATE trial that is evaluating whether intensive lowering of serum phosphate reduces the risk of major adverse cardiovascular events.

Please note: Dr. Wald is not taking any summer students.

Recent Publications

  1. Ishikita, A, Karur, GR, Hanneman, K, Yuen, DA, Chaturvedi, RR, Friedberg, MK et al.. Myocardial Extracellular Volume Fraction Varies With Hemodynamic Load and After Pulmonary Valve Replacement in TOF. JACC Cardiovasc Imaging. 2024; :. doi: 10.1016/j.jcmg.2024.02.013. PubMed PMID:38639696 .
  2. Pracoń, R, Spertus, JA, Broderick, S, Bangalore, S, Rockhold, FW, Ruzyllo, W et al.. Factors Associated With Coronary Angiography Performed Within 6 Months of Randomization to the Conservative Strategy in the ISCHEMIA Trial. Circ Cardiovasc Interv. 2024; :e013435. doi: 10.1161/CIRCINTERVENTIONS.123.013435. PubMed PMID:38629312 .
  3. Katz, NT, Oratz, R, Steinert, Y, Wald, R, Carmi, R. When medical duty and advocacy are one-sided, both sides suffer. Lancet. 2024;403 (10436):1540-1541. doi: 10.1016/S0140-6736(24)00239-3. PubMed PMID:38608684 .
  4. Leonardi, B, Sollazzo, F, Gentili, F, Bianco, M, Pomiato, E, Kikina, SS et al.. Cardiopulmonary Exercise Testing after Surgical Repair of Tetralogy of Fallot-Does Modality Matter?. J Clin Med. 2024;13 (5):. doi: 10.3390/jcm13051192. PubMed PMID:38592039 PubMed Central PMC10932302.
  5. Junek, ML, Merkel, PA, Vilayur, E, Wald, R, Khalidi, N, Jayne, D et al.. Risk of Relapse of Antineutrophil Cytoplasmic Antibody-Associated Vasculitis in a Randomized Controlled Trial of Plasma Exchange and Glucocorticoids. Arthritis Rheumatol. 2024; :. doi: 10.1002/art.42843. PubMed PMID:38485450 .
  6. Beaubien-Souligny, W, Galarza, L, Buchannan, B, Lau, VI, Adhikari, NKJ, Deschamps, J et al.. Prospective Study of Ultrasound Markers of Organ Congestion in Critically Ill Patients With Acute Kidney Injury. Kidney Int Rep. 2024;9 (3):694-702. doi: 10.1016/j.ekir.2023.12.018. PubMed PMID:38481488 PubMed Central PMC10927464.
  7. Zampieri, FG, Serpa-Neto, A, Wald, R, Bellomo, R, Bagshaw, SM, STARRT-AKI and RENAL Investigators et al.. Hierarchical endpoints in critical care: A post-hoc exploratory analysis of the standard versus accelerated initiation of renal-replacement therapy in acute kidney injury and the intensity of continuous renal-replacement therapy in critically ill patients trials. J Crit Care. 2024;82 :154767. doi: 10.1016/j.jcrc.2024.154767. PubMed PMID:38461657 .
  8. Massarella, D, McCrindle, BW, Runeckles, K, Fan, S, Dahdah, N, Dallaire, F et al.. Adherence to clinical practice guidelines for pulmonary valve intervention after tetralogy of Fallot repair: A nationwide cohort study. JTCVS Open. 2024;17 :215-228. doi: 10.1016/j.xjon.2023.11.013. PubMed PMID:38420530 PubMed Central PMC10897679.
  9. Reynolds, HR, Cyr, DD, Merz, CNB, Shaw, LJ, Chaitman, BR, Boden, WE et al.. Sex Differences in Revascularization, Treatment Goals, and Outcomes of Patients With Chronic Coronary Disease: Insights From the ISCHEMIA Trial. J Am Heart Assoc. 2024;13 (5):e029850. doi: 10.1161/JAHA.122.029850. PubMed PMID:38410945 PubMed Central PMC10944079.
  10. Vaara, ST, Serpa Neto, A, Bellomo, R, Adhikari, NKJ, Dreyfuss, D, Gallagher, M et al.. Regional Practice Variation and Outcomes in the Standard Versus Accelerated Initiation of Renal Replacement Therapy in Acute Kidney Injury (STARRT-AKI) Trial: A Post Hoc Secondary Analysis. Crit Care Explor. 2024;6 (2):e1053. doi: 10.1097/CCE.0000000000001053. PubMed PMID:38380940 PubMed Central PMC10878545.
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Affiliations & Other Activities

  • Director, Hemodialysis, Division of Nephrology, Department of Medicine, St. Michael’s Hospital
  • Professor, Department of Medicine and Health Policy Management and Evaluation, University of Toronto
  • Adjunct Scientist, Institute for Clinical Evaluative Sciences