无症状心肌缺血(SMI)也称为无痛性心肌缺血或隐匿性心肌缺血,系指有心肌缺血的客观证据,但无临床症状的一种病理状态。自从动态心电图广泛应用以来,发现SMI在冠心病患者中十分常见,因其发作隐匿,易被忽视,故急性心肌梗死及心性猝死的发病率都高于有症状心肌缺血[1]。因此,SMI的 Asymptomatic myocardial ischemia (SMI), also known as painless myocardial ischemia or occult myocardial ischemia, refers to objective evidence of myocardial ischemia but no clinical signs of a pathological condition. Since the Holter ECG has been widely used, found in patients with coronary heart disease is very common in SMI, because of its occult attack, easily overlooked, so the incidence of acute myocardial infarction and sudden cardiac death than in symptomatic myocardial ischemia [1]. So SMI’s