Between June 29 , 2006 , and Nov 13 , 2007 , 984 patients with STEMI who were candidates to undergo PCI were randomly assigned to either high-bolus dose tirofiban ( n = 491 ) or placebo ( N = 493 ) in addition to aspirin ( 500 mg ) , heparin ( 5000 IU ) , and clopidogrel ( 600 mg ) .
