Ron Wald


Scientist, Li Ka Shing Knowledge Institute

Tel: 416-867-3703
Twitter: @DrRonWald


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. Bavil, EA, Yang, HK, Doyle, MG, Kim, TK, Karur, G, Bhagra, C et al.. Cardiovascular and abdominal flow alterations in adults with morphologic evidence of liver disease post Fontan palliation. Int. J. Cardiol. 2020; :. doi: 10.1016/j.ijcard.2020.05.064. PubMed PMID:32470536 .
  2. Iskander, C, Cherney, DZ, Clemens, KK, Dixon, SN, Harel, Z, Jeyakumar, N et al.. Use of sodium-glucose cotransporter-2 inhibitors and risk of acute kidney injury in older adults with diabetes: a population-based cohort study. CMAJ. 2020;192 (14):E351-E360. doi: 10.1503/cmaj.191283. PubMed PMID:32392523 PubMed Central PMC7145366.
  3. van Mil, S, Heung, T, Malecki, S, Van, L, Chang, J, Breetvelt, E et al.. Impact of a 22q11.2 microdeletion on adult all-cause mortality in tetralogy of Fallot. Can J Cardiol. 2020; :. doi: 10.1016/j.cjca.2020.04.019. PubMed PMID:32348848 .
  4. Gaudry, S, Hajage, D, Benichou, N, Chaïbi, K, Barbar, S, Zarbock, A et al.. Delayed versus early initiation of renal replacement therapy for severe acute kidney injury: a systematic review and individual patient data meta-analysis of randomised clinical trials. Lancet. 2020;395 (10235):1506-1515. doi: 10.1016/S0140-6736(20)30531-6. PubMed PMID:32334654 .
  5. Ducas, RA, Harris, L, Labos, C, Kumar Nair, GK, Wald, RM, Hickey, EJ et al.. Outcomes in Young Adults with Tetralogy of Fallot and Pulmonary Annular Preserving or Transannular Patch Repairs. Can J Cardiol. 2020; :. doi: 10.1016/j.cjca.2020.04.014. PubMed PMID:32325106 .
  6. Leonardi, B, Drago, F, Caldarone, CA, Dahdah, N, Dallaire, F, Drolet, C et al.. Impact of Age and Sex on Cardiovascular Magnetic Resonance Measurements: After Tetralogy of Fallot Repair. JACC Cardiovasc Imaging. 2020; :. doi: 10.1016/j.jcmg.2020.02.021. PubMed PMID:32305481 .
  7. Frazao, C, Tavoosi, A, Wintersperger, BJ, Nguyen, ET, Wald, RM, Ouzounian, M et al.. Multimodality Assessment of Thoracic Aortic Dimensions: Comparison of Computed Tomography Angiography, Magnetic Resonance Imaging, and Echocardiography Measurements. J Thorac Imaging. 2020; :. doi: 10.1097/RTI.0000000000000514. PubMed PMID:32251236 .
  8. Bangalore, S, Maron, DJ, O'Brien, SM, Fleg, JL, Kretov, EI, Briguori, C et al.. Management of Coronary Disease in Patients with Advanced Kidney Disease. N. Engl. J. Med. 2020;382 (17):1608-1618. doi: 10.1056/NEJMoa1915925. PubMed PMID:32227756 .
  9. Maron, DJ, Hochman, JS, Reynolds, HR, Bangalore, S, O'Brien, SM, Boden, WE et al.. Initial Invasive or Conservative Strategy for Stable Coronary Disease. N. Engl. J. Med. 2020;382 (15):1395-1407. doi: 10.1056/NEJMoa1915922. PubMed PMID:32227755 .
  10. Spertus, JA, Jones, PG, Maron, DJ, Mark, DB, O'Brien, SM, Fleg, JL et al.. Health Status after Invasive or Conservative Care in Coronary and Advanced Kidney Disease. N. Engl. J. Med. 2020;382 (17):1619-1628. doi: 10.1056/NEJMoa1916374. PubMed PMID:32227754 PubMed Central PMC7255621.
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Affiliations & Other Activities

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