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Published ahead of print on May 10, 2006
Clin J Am Soc Nephrol 1: 885-895, 2006
© 2006 American Society of Nephrology
doi: 10.2215/CJN.00840306
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Special Features

Medical Risks in Living Kidney Donors: Absence of Proof Is Not Proof of Absence

Elizabeth S. Ommen, Jonathan A. Winston, and Barbara Murphy

Mount Sinai Medical Center, Division of Nephrology, New York, New York

Address correspondence to: Dr. Elizabeth S. Ommen, Mount Sinai Medical Center, Division of Nephrology, 1 Gustave Levy Place, Box 1243, New York, NY 10029. Phone: 212-241-3549; Fax: 212-987-0389; E-mail: elizabeth.ommen{at}mssm.edu

Living-kidney donation has become increasingly widespread, yet there has been little critical analysis of existing studies of long-term medical outcomes in living donors. This review analyzes issues in study design that affect the quality of the evidence and summarizes possible risk factors in living donors. Virtually all studies of long-term outcomes in donors are retrospective, many with large losses to follow-up, and therefore are subject to selection bias. Most studies have small sample sizes and are underpowered to detect clinically meaningful differences between donors and comparison groups. Many studies compare donors with the general population, but donors are screened to be healthier than the general population and this may not be a valid comparison group. Difficulties in measurement of BP and renal function may underestimate the impact of donation on these outcomes. Several studies have identified possible risk factors for development of hypertension, proteinuria, and ESRD, but potential vulnerability factors in donors have not been well explored and there is a paucity of data on cardiovascular risk factors in donors. Prospective registration of living kidney donors and prospective studies of diverse populations of donors are essential to protect living donors and preserve living-kidney donation.




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