A federal health agency has a set of guidelines for evaluating implant candidates . Duke University study : More than 20 % of implant recipients were n't good candidates . Among those patients , the risk of dying in the hospital was significantly higher . Comment:
A federal health agency has a set of guidelines for evaluating implant candidates . Duke University study : More than 20 % of implant recipients were n't good candidates . Among those patients , the risk of dying in the hospital was significantly higher . Findings will have `` major implications , '' the president of a cardiologists ' group says .