November 27, 2008
Organ Distribution Changes
The Boston Globe reports on the Journal of American Medical Association's recent article concerning a change to the method of distributing organ donations - provide the donations to the sickest individuals. Turns out that this change in method helps eliminate some of the racial differences in survival rates.
Blacks waiting for a liver transplant used to be more likely to die compared to whites. Now they have the same chance of getting a life-saving organ under a nationwide system that puts the sickest patients first, a new study found. Racial differences disappeared when the old system was scrapped in 2002, according to the federally funded study, the first assessment of how blacks fared after the change.
"By design, we tried to make it race blind. It looks like we did," said Dr. Richard Freeman, a transplant surgeon at Tufts University School of Medicine in Boston, who helped create the new system and was not involved in the study. But the research, in Wednesday's Journal of the American Medical Association, suggests the system may favor men over women. Dr. Cynthia Moylan, the study's lead author and a transplant fellow at Duke University Medical Center in Durham, N.C., called for more research on gender differences. . . .
Under the old system, which relied heavily on how long a patient spent on an official waiting list, sicker patients were passed over in favor of those waiting longer. The system favored whites because blacks join waiting lists when they are sicker. Why isn't clear, but blacks may get treatment later or have poor access to liver specialists. . . .
The new system is based on three lab tests. Results are combined as a score that predicts a patient's risk of death within three months. Livers are allocated based on scores. The change was made after the government ordered the United Network for Organ Sharing, which runs the transplant network, to make liver allocation less arbitrary. Prior research has also found racial disparities in the allocation of kidneys. UNOS is currently evaluating its system for kidneys, which is now based on waiting time, blood type and tissue type. . . .
For women, MELD wasn't an improvement. The study found women had a 30 percent greater chance of dying or becoming too sick for transplant with the new scoring system. The gender difference wasn't significant before. One of the lab tests in the score may underestimate the severity of illness in women because of their smaller average size, said Dr. David Axelrod of Dartmouth-Hitchcock Medical Center in Lebanon, N.H., who was not involved in the study, but wrote an accompanying editorial. "With a relatively minimal change we can deal with that," Axelrod said, suggesting a different weight-adjusted measurement. . . .
Regional differences in waiting list times are still a big problem, said Dr. J. Michael Millis, head of transplantation at University of Chicago Medical Center. Donated organs are generally offered to local patients first. Some states with greater demand for organs have longer wait times. "In Wisconsin, waiting time is approximately half that in Chicago 90 miles away," Millis said. "There's no rational way to justify that."
November 27, 2008 | Permalink
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