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Inadequate Donor Size in Cadaver Kidney Transplantation

Bertram L. Kasiske^*,, Jon J. Snyder^* and David Gilbertson^*

*The United States Renal Data System Coordinating Center, Minneapolis, Minnesota; and Department of Medicine, Hennepin County Medical Center, Minneapolis, Minnesota.

Correspondence to Dr. Bertram L. Kasiske, Department of Medicine, Hennepin County Medical Center, 701 Park Avenue, Minneapolis, MN 55414. Phone: 612-347-6088; Fax: 612-347-2003; E-mail: kasis001{at}umn.edu

ABSTRACT. There have been conflicting reports that kidneys from small donors may be at increased risk for late graft failure if they are transplanted into large recipients. Data from the United States Renal Data System was used to study all first cadaver kidney transplantations performed during the years 1994 to 1999. Donor and recipient body surface area (BSA) combinations were included along with other patient and transplant characteristics in a Poisson analysis of factors associated with early (in the first 4 mo) and late (4 mo) graft failure. The numbers of large (BSA >2.2 m²) and medium size (BSA 1.6 to 2.2 m²) recipients that received kidneys from small (BSA <1.6 m²) donors are less than expected (² = 118.09; P < 0.0001), suggesting that transplant centers may be refusing some kidneys on the basis of donor-recipient size differences. Large recipients who received kidneys from small donors made up 1.5% of the population and had a 43% (95% CI, 17 to 75%; P = 0.0004) increased risk of late graft failure compared with medium-size recipients who received kidneys from medium-size donors (53.4% of the population). Medium-size recipients who received kidneys from small donors made up 12.0% of the population and had a 16% (95% CI, 6 to 26%; P = 0.0012) increased risk of late graft failure. Disparities in recipient and donor size had similar adverse affects on mortality. Effects of recipient obesity (body mass index) and donor gender on late graft survival were no longer statistically significant after the effects of donor and recipient body size were taken into account. In conclusion, the relative size of the donor and recipient should possibly be taken into account when choosing kidneys for transplantation.

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Copyright © 2009 by the American Society of Nephrology. Online ISSN: 1533-3450 Print ISSN: 1046-6673