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Background Transradial access has been increasingly used during primary percutaneous coronary intervention (PCI) for patients with acute ST-segment elevation myocardial infarction (STEMI) in last decade.Clinical benefits of upstream use of tirfiban therapy in STEMI patients treated by primary PCI have been reported.We investigated the merits of transradial vs.transfemoral access in primary PCI for STEMI patients with upstream use of tirofiban.