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. Alansari, H, Wald, R, Deva, DP, Ong, J, Chang, LD, Kiaii, M et al.. Relationships between cardiac structural and functional assessment by cardiac MRI and hemoglobin in end-stage renal disease. J Nephrol. 2021; :. doi: 10.1007/s40620-021-01123-w. PubMed PMID:34279812 .
  2. Lin, J, Ji, XJ, Wang, AY, Liu, JF, Liu, P, Zhang, M et al.. Corrigendum to "Timing of continuous renal replacement therapy in severe acute kidney injury patients with fluid overload: A retrospective cohort study" [J Crit Care. 2021 Aug; 64: 226-236]. J Crit Care. 2021; :. doi: 10.1016/j.jcrc.2021.07.004. PubMed PMID:34274206 .
  3. Ducas, R, Saini, BS, Yamamura, K, Bhagra, C, Marini, D, Silversides, CK et al.. Maternal and Fetal Hemodynamic Adaptations to Pregnancy and Clinical Outcomes in Maternal Cardiac Disease. Can J Cardiol. 2021; :. doi: 10.1016/j.cjca.2021.06.015. PubMed PMID:34224828 .
  4. Primary Panel, Ian Paterson, D, White, JA, Butler, CR, Connelly, KA, Guerra, PG et al.. 2021 Update on Safety of Magnetic Resonance Imaging: Joint Statement From Canadian Cardiovascular Society/Canadian Society for Cardiovascular Magnetic Resonance/Canadian Heart Rhythm Society. Can J Cardiol. 2021;37 (6):835-847. doi: 10.1016/j.cjca.2021.02.012. PubMed PMID:34154798 .
  5. Beaubien-Souligny, W, Yang, Y, Burns, KEA, Friedrich, JO, Meraz-Muñoz, A, Clark, EG et al.. Intra-dialytic hypotension following the transition from continuous to intermittent renal replacement therapy. Ann Intensive Care. 2021;11 (1):96. doi: 10.1186/s13613-021-00885-7. PubMed PMID:34146164 PubMed Central PMC8214642.
  6. Ye, Z, Wang, Y, Ge, L, Guyatt, GH, Collister, D, Alhazzani, W et al.. Comparing Renal Replacement Therapy Modalities in Critically Ill Patients With Acute Kidney Injury: A Systematic Review and Network Meta-Analysis. Crit Care Explor. 2021;3 (5):e0399. doi: 10.1097/CCE.0000000000000399. PubMed PMID:34079944 PubMed Central PMC8162503.
  7. Pfaller, B, Dave Javier, A, Grewal, J, Gabarin, N, Colman, J, Kiess, M et al.. Risk Associated With Valvular Regurgitation During Pregnancy. J Am Coll Cardiol. 2021;77 (21):2656-2664. doi: 10.1016/j.jacc.2021.03.327. PubMed PMID:34045022 .
  8. Robinson, C, Jeyakumar, N, Luo, B, Wald, R, Garg, A, Nash, D et al.. Long-term Kidney Outcomes Following Childhood Acute Kidney Injury Receiving Dialysis: A Population-based Cohort Study. J Am Soc Nephrol. 2021; :. doi: 10.1681/ASN.2020111665. PubMed PMID:34039667 .
  9. Bagshaw, SM, Hoste, EA, Wald, R. When should we start renal-replacement therapy in critically ill patients with acute kidney injury: do we finally have the answer?. Crit Care. 2021;25 (1):179. doi: 10.1186/s13054-021-03600-x. PubMed PMID:34039373 PubMed Central PMC8152190.
  10. Lin, J, Ji, XJ, Wang, AY, Liu, JF, Liu, P, Zhang, M et al.. Timing of continuous renal replacement therapy in severe acute kidney injury patients with fluid overload: A retrospective cohort study. J Crit Care. 2021;64 :226-236. doi: 10.1016/j.jcrc.2021.04.017. PubMed PMID:34034218 .
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Affiliations & Other Activities

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