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. Sanchez Tijmes, F, Chan, VSH, Murphy, J, Hashem, DAL, Hanneman, K, Wald, RM et al.. Mitral annular disjunction on cardiac MRI: Prevalence and association with disease severity in Loeys-Dietz syndrome. Int J Cardiol. 2023; :131276. doi: 10.1016/j.ijcard.2023.131276. PubMed PMID:37598908 .
  2. Jeong, R, James, MT, Quinn, RR, Ravani, P, Bagshaw, SM, Stelfox, HT et al.. Follow-up Care of Critically Ill Patients With Acute Kidney Injury: A Cohort Study. Kidney Med. 2023;5 (8):100685. doi: 10.1016/j.xkme.2023.100685. PubMed PMID:37538394 PubMed Central PMC10394002.
  3. Cote, G, Alqaisi, H, Chan, CT, Jiang, DM, Kandel, C, Pelletier, K et al.. Kidney and Cancer Outcomes with Standard Versus Alternative Chemotherapy Regimens for First-Line Treatment of Metastatic Urothelial Carcinoma. Kidney360. 2023; :. doi: 10.34067/KID.0000000000000214. PubMed PMID:37461133 .
  4. Shah, AH, Oechslin, E, Benson, L, Crean, AM, Silversides, C, Bach, Y et al.. Long-Term Outcomes of Unrepaired Isolated Partial Anomalous Pulmonary Venous Connection With an Intact Atrial Septum. Am J Cardiol. 2023;201 :232-238. doi: 10.1016/j.amjcard.2023.05.049. PubMed PMID:37392606 .
  5. Yau, K, McArthur, E, Jeyakumar, N, Tsobo Muanda, F, Kim, RB, Clemens, KK et al.. Adverse events with quetiapine and clarithromycin coprescription: A population-based retrospective cohort study. Health Sci Rep. 2023;6 (6):e1375. doi: 10.1002/hsr2.1375. PubMed PMID:37359413 PubMed Central PMC10290079.
  6. Bitterman, Y, Hui, W, Fan, CS, Kiss, A, Mertens, L, Wald, RM et al.. Electromechanical Dyssynchrony Is Associated With Right Ventricular Remodeling and Dysfunction Independently of Pulmonary Regurgitation Late After Tetralogy of Fallot Repair. J Am Soc Echocardiogr. 2023; :. doi: 10.1016/j.echo.2023.06.010. PubMed PMID:37356675 .
  7. Ishikita, A, McIntosh, C, Hanneman, K, Lee, MM, Liang, T, Karur, GR et al.. Machine Learning for Prediction of Adverse Cardiovascular Events in Adults With Repaired Tetralogy of Fallot Using Clinical and Cardiovascular Magnetic Resonance Imaging Variables. Circ Cardiovasc Imaging. 2023;16 (6):e015205. doi: 10.1161/CIRCIMAGING.122.015205. PubMed PMID:37339175 PubMed Central PMC10281184.
  8. Bokma, JP, Geva, T, Sleeper, LA, Lee, JH, Lu, M, Sompolinsky, T et al.. Improved Outcomes After Pulmonary Valve Replacement in Repaired Tetralogy of Fallot. J Am Coll Cardiol. 2023;81 (21):2075-2085. doi: 10.1016/j.jacc.2023.02.052. PubMed PMID:37225360 .
  9. Kovacs, AH, Lebovic, G, Raptis, S, Blais, S, Caldarone, CA, Dahdah, N et al.. Patient-Reported Outcomes After Tetralogy of Fallot Repair. J Am Coll Cardiol. 2023;81 (19):1937-1950. doi: 10.1016/j.jacc.2023.03.385. PubMed PMID:37164527 .
  10. Clark, EG, James, MT, Hiremath, S, Sood, MM, Wald, R, Garg, AX et al.. Predictive Models for Kidney Recovery and Death in Patients Continuing Dialysis as Outpatients after Starting in Hospital. Clin J Am Soc Nephrol. 2023;18 (7):892-903. doi: 10.2215/CJN.0000000000000173. PubMed PMID:37071648 PubMed Central PMC10356112.
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Affiliations & Other Activities

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