Three heart transplants were successfully performed with infant donors whose hearts had stopped beating, according to researchers here, but some ethicists question whether moral boundaries were crossed. The report in the Aug. 14 issue of the New England Journal of Medicine reopened a long-simmering debate that boils down to the question of how to define death of a potential donor before organ harvesting may proceed. The three recipients, mean age 2.2 months, have survived at least 3.5 years with only one having a rejection episode during the first six months after surgery, reported Mark M. Boucek, M.D., and colleagues of...