To the Editor: Between December 2, 1967, and August 2, 1981, a total of 50 orthotopic and heterotopic cardiac transplantations were performed at Groote Schuur Hospital. Of the 37 recipients surviving for two months or more, 18 were of blood Group A, 12 of Group O, 5 of Group B, and 2 of Group AB. Although these numbers were small, we found a significantly shorter period of survival in patients with B antigen on their red cells than in patients without this antigen (P<0.005 by the Student t-test for unpaired data) (Fig. 1). The B-antigen group (seven patients) and. . . No extract is available for articles shorter than 400 words. © 1982, Massachusetts Medical Society. All rights reserved.