Ron Wald




Ron Wald is a nephrologist and Associate 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 a Master in Public Health at Harvard University and a research fellowship at Tufts Medical Center in Boston. Since joining the St. Michael’s Hospital Division of Nephrology in 2006, Dr. Wald has been responsible for the hospital’s acute dialysis program. In addition to attending on the hospital’s Nephrology consult and ward services, he provides longitudinal care for patients on chronic hemodialysis and has an active general nephrology practice.

Dr. Wald’s research interests are in the areas of critical care nephrology and chronic dialysis. He is currently leading a Canadian Institutes of Health Research-funded international trial on the impact of the timing of dialysis initiation on survival in critically ill patients with acute kidney injury. He also has a strong interest in the long-term outcomes of patients who survive an episode of acute kidney injury and is co-leading a trial that is comparing specialized nephrology care vs usual care in this population. In the chronic dialysis area, Dr. Wald co-led a CIHR-funded study on the cardiovascular benefits of incentre nocturnal hemodialysis. He recently completed a multicentre pilot trial examining the implementation of two different levels of serum phosphate control in the hemodialysis population. A larger definitive trial to evaluate whether intensive serum phosphate lowering mediates improved clinical outcomes is planned. As a founding member of the Kidney Dialysis and Transplantation Program of the Institute for Clinical Evaluative Sciences, Dr. Wald is also involved in several studies that are using province-wide administrative data to answer research questions in kidney disease.

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

Recent Publications

  1. Lam, CZ, Nguyen, ET, Yoo, SJ, Wald, RM. Management of patients with single ventricle physiology across the lifespan: contributions from magnetic resonance and computed tomography imaging. Can J Cardiol. 2022; :. doi: 10.1016/j.cjca.2022.01.011. PubMed PMID:35051600 .
  2. Leonardi, B, Gentili, F, Perrone, MA, Sollazzo, F, Cocomello, L, Silva Kikina, S et al.. Cardiopulmonary Exercise Testing in Repaired Tetralogy of Fallot: Multiparametric Overview and Correlation with Cardiac Magnetic Resonance and Physical Activity Level. J Cardiovasc Dev Dis. 2022;9 (1):. doi: 10.3390/jcdd9010026. PubMed PMID:35050237 PubMed Central PMC8778451.
  3. Cai, S, Mahmood, T, Hashi, AA, Prasad, R, Connelly, PW, Connelly, KA et al.. Assessments of right ventricular strain using cardiac magnetic resonance imaging following kidney transplantation. Nephrology (Carlton). 2021; :. doi: 10.1111/nep.14015. PubMed PMID:34939711 .
  4. Lam, CZ, Gulamhusein, A, Wald, RM. Liver Cirrhosis and Hepatocellular Carcinoma After the Fontan Operation: Reaching Clarity in the Face of Uncertainty. Circulation. 2021;144 (25):1977-1980. doi: 10.1161/CIRCULATIONAHA.121.057431. PubMed PMID:34928704 .
  5. Connelly, PW, Yan, AT, Nash, MM, Wald, RM, Lok, C, Gunaratnam, L et al.. The Increase in Paraoxonase 1 Is Associated With Decrease in Left Ventricular Volume in Kidney Transplant Recipients. Front Cardiovasc Med. 2021;8 :763389. doi: 10.3389/fcvm.2021.763389. PubMed PMID:34926614 PubMed Central PMC8674585.
  6. Ly, H, Ortiz-Soriano, V, Liu, LJ, Liu, Y, Chen, J, Chang, AR et al.. Characteristics and Outcomes of Survivors of Critical Illness and Acute Kidney Injury Followed in a Pilot Acute Kidney Injury Clinic. Kidney Int Rep. 2021;6 (12):3070-3073. doi: 10.1016/j.ekir.2021.08.017. PubMed PMID:34901575 PubMed Central PMC8640541.
  7. Majeed, A, Geva, T, Sleeper, LA, Graf, JA, Lu, M, Babu-Narayan, SV et al.. Cardiac MRI predictors of good long-term outcomes in patients with repaired TOF. Am Heart J. 2021;245 :70-77. doi: 10.1016/j.ahj.2021.11.015. PubMed PMID:34875276 .
  8. Laflamme, E, Wald, RM, Roche, SL, Silversides, CK, Thorne, SA, Colman, JM et al.. Outcome and right ventricle remodelling after valve replacement for pulmonic stenosis. Heart. 2021; :. doi: 10.1136/heartjnl-2021-320121. PubMed PMID:34815333 .
  9. Jeong, R, Wald, R, Bagshaw, SM. Timing of renal-replacement therapy in intensive care unit-related acute kidney injury. Curr Opin Crit Care. 2021;27 (6):573-581. doi: 10.1097/MCC.0000000000000891. PubMed PMID:34757994 .
  10. Ali, LA, Gentili, F, Festa, P, Perrone, MA, Curione, D, Caputo, M et al.. Long-term assessment of clinical outcomes and disease progression in patients with corrected Tetralogy of Fallot. Eur Rev Med Pharmacol Sci. 2021;25 (20):6300-6310. doi: 10.26355/eurrev_202110_27000. PubMed PMID:34730210 .
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Affiliations & Other Activities

  • Nephrologist, Department of Medicine, St. Michael’s Hospital
  • Associate Professor, Department of Medicine, University of Toronto