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Kidney donor age linked to aortic siffening
Date:2/21/2008

Washington, DC (February 21, 2008) Transplantation of kidneys from older donors is followed by increased stiffening of the recipient's aortawhich may help to explain the higher rates of cardiovascular disease and death in patients receiving kidneys from "expanded criteria" donors, reports a study in the April Journal of the American Society of Nephrology.

Led by Drs. Michel Delahousse and Michel Chaignon of Foch Hospital in Suresnes, France, and Jean-Philippe Haymann of Tenon Hospital in Paris, the researchers used a technique called carotid-femoral pulse wave velocity to measure aortic stiffness in 74 patients who had received kidney transplants from deceased donors. The aorta is the body's large central artery; increased stiffness is a sign of damage to the large arteries. Such arterial damage is one of the main reasons for the high rates of cardiovascular disease and death in patients with end-stage renal disease (ESRD).

When first measured, three months after transplantation, aortic stiffness was related exclusively to characteristics of the transplant recipient. The aorta was stiffer in transplant recipients who were men, older, and had higher blood pressure.

However, when the measurement was repeated after 12 months, aortic stiffness had gotten significantly worse in patients who received kidneys from the oldest donors (53- to 70-years old). "We found that donor age emerged as a strong and independent determinant of recipient aortic stiffness one year post-transplantation," comments Dr Delahousse. In contrast, for patients receiving kidneys from younger donors, aortic stiffness decreased.

For recipients of older-donor kidneys, pulse wave velocity was increased by one meter per second"A very significant finding," adds Dr. Delahousse. "Indeed, such an increase was previously associated with a 39 percent increase in overall risk of death in ESRD patients."

The results could be a significant step toward ta
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Contact: Shari Leventhal
sleventhal@asn-online.org
202-416-0658
American Society of Nephrology
Source:Eurekalert

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