At 30 days , the primary composite endpoint of death , myocardial infarction , unplanned revascularization of the infarct related artery , stent thrombosis , stroke , or bleeding was observed in 42 patients ( 15.6 % ) randomized to prasugrel plus bivalirudin and 40 patients ( 14.5 % ) randomized to clopidogrel plus heparin [ relative risk , 1.09 ; one-sided 97.5 % confidence interval ( CI ) 0-1 .79 , P = 0.680 ] .