冠状动脉临界病变是指采用冠状动脉造影直径法测定狭窄程度在50%~70%的冠脉病变。传统方法对于狭窄程度在70%以上的狭窄采用介入治疗为主,而小于70%的狭窄则以药物保守治疗为主。然而有研究[1]表明58%的ST段抬高性心肌梗死患者发病前的冠脉造影显示为冠脉临界病变,其发生急性心肌梗死的原因考虑为不稳定斑块破裂诱发急性血栓形成,导致冠脉血管急性闭塞。尽管临界病变介入治疗对技 Coronary artery disease refers to the critical coronary artery diameter by coronary angiography stenosis in 50% to 70% of coronary lesions. The traditional method for the stenosis of more than 70% of the stenosis interventional therapy based, while less than 70% of the stenosis is dominated by drug conservative treatment. However, some studies [1] showed that 58% of patients with ST-elevation myocardial infarction before onset of coronary angiography showed a critical coronary disease, the occurrence of acute myocardial infarction was considered due to unstable plaque rupture induced acute thrombosis, Lead to acute coronary artery occlusion. Although critical disease interventional therapy skills