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. Wald, R, Bagshaw, SM, STARRT-AKI Investigators. Integration of Equipoise into Eligibility Criteria in the STARRT-AKI Trial. Am J Respir Crit Care Med. 2021; :. doi: 10.1164/rccm.202009-3425LE. PubMed PMID:33939598 .
  2. Naorungroj, T, Neto, AS, Yanase, F, Eastwood, G, Wald, R, Bagshaw, SM et al.. Time to Initiation of Renal Replacement Therapy Among Critically Ill Patients With Acute Kidney Injury: A Current Systematic Review and Meta-Analysis. Crit Care Med. 2021; :. doi: 10.1097/CCM.0000000000005018. PubMed PMID:33861550 .
  3. Nouraei, H, Leiter, LA, Tan, MK, Langer, A, Teoh, H, Cheng, AYY et al.. Glycemic Control and Cardiovascular Risk Factor Management in Adults With Type 2 Diabetes With and Without Chronic Kidney Disease Before Sodium-Glucose Cotransporter Protein 2 Inhibitors: Insights From the Diabetes Mellitus Status in Canada Survey. Can J Diabetes. 2021; :. doi: 10.1016/j.jcjd.2021.02.003. PubMed PMID:33839025 .
  4. Greenberg, JH, McArthur, E, Thiessen-Philbrook, H, Zappitelli, M, Wald, R, Kaushal, S et al.. Long-term Risk of Hypertension After Surgical Repair of Congenital Heart Disease in Children. JAMA Netw Open. 2021;4 (4):e215237. doi: 10.1001/jamanetworkopen.2021.5237. PubMed PMID:33830227 PubMed Central PMC8033439.
  5. Meraz-Muñoz, AY, Bagshaw, SM, Wald, R. Timing of kidney replacement therapy initiation in acute kidney injury. Curr Opin Nephrol Hypertens. 2021;30 (3):332-338. doi: 10.1097/MNH.0000000000000707. PubMed PMID:33767061 .
  6. Bagshaw, SM, Wald, R. Starting Kidney Replacement Therapy in Critically III Patients with Acute Kidney Injury. Crit Care Clin. 2021;37 (2):409-432. doi: 10.1016/j.ccc.2020.11.005. PubMed PMID:33752864 .
  7. Saini, BS, Darby, JRT, Marini, D, Portnoy, S, Lock, MC, Yin Soo, J et al.. An MRI approach to assess placental function in healthy humans and sheep. J Physiol. 2021; :. doi: 10.1113/JP281002. PubMed PMID:33675040 .
  8. Malhamé, I, Othman, M, Casais, P, D'Souza, R, Wald, RM, Silversides, CK et al.. Communication from the ISTH SSC Subcommittee on Women's Health Issues in Thrombosis and Haemostasis: A Survey on Anticoagulation for Mechanical Heart Valves in Pregnancy. J Thromb Haemost. 2021;19 (3):859-864. doi: 10.1111/jth.15213. PubMed PMID:33650243 .
  9. Beaubien-Souligny, W, Yang, A, Lebovic, G, Wald, R, Bagshaw, SM. Frailty status among older critically ill patients with severe acute kidney injury. Crit Care. 2021;25 (1):84. doi: 10.1186/s13054-021-03510-y. PubMed PMID:33632288 PubMed Central PMC7908639.
  10. Alabbas, A, Kirpalani, A, Morgan, C, Mammen, C, Licht, C, Phan, V et al.. Canadian Association of Paediatric Nephrologists COVID-19 Rapid Response: Guidelines for Management of Acute Kidney Injury in Children. Can J Kidney Health Dis. 2021;8 :2054358121990135. doi: 10.1177/2054358121990135. PubMed PMID:33614056 PubMed Central PMC7868478.
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Affiliations & Other Activities

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