Objective: To investigate the optimal time and the effect of the treatment with percutaneous coronary intervention (PCI) for patients with ST segment elevate myocardial infarction(STEMI) by comparing different time in patients with direct PCI.

• 目的:通过比较<12h直接经皮冠状动脉介入治疗(percutaneous coronaryintervention；PCI)与>12h直接PCI对ST段抬高性心肌梗死(ST segmentelevate myocardial infarction；STEMI)患者心功能及主要心血管事件的影响；探讨最佳直接PCI治疗时机和>12h直接PCI的疗效。