Abstract
To the Editor: Renlund and colleagues raise some very important questions and provide some valid criticisms of the Medicare designation of cardiac transplantation centers (April 2 issue).1 It is indeed important to recognize that the National Heart Transplantation Study (NHTS) has certain limitations with respect to generalizability. However, it is inappropriate to conclude that the report has little value in establishing criteria for cardiac transplantation programs. In a very detailed analysis, we were able to show that the proliferation of cardiac transplantation centers was a problem that had to be addressed by those responsible for the Medicare program. A main . . .

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