The composite ischaemic endpoint of death , myocardial infarction , unplanned revascularization of the infarct-related artery , stent thrombosis , or stroke occurred in @ patients ( @ % ) in the prasugrel plus bivalirudin group and @ patients ( @ % ) in the clopidogrel plus heparin group ( relative risk , @ ; @ % CI @-@ @ , P = @ ) .