美国每年约有50万例因急性心肌梗塞而住院,40万例以上在住院期存活。出院后病死率第一年平均为10%,第二年为5%,以后每年为3～4%。死亡危险主要是在住院后头六月内,猝死(1小时内)与非猝死的分布几乎相等。许多心肌梗塞后危险性的分级研究,检示了某些临床因素与心源性死亡间的伴随关系。晚近的研究强调通过功能或生理成份对心肌梗塞后危险性分级的重要性。从许多危 Approximately 500,000 U.S. patients are hospitalized for acute myocardial infarction and more than 400,000 live in hospitalized patients each year. In the first year after discharge, the case fatality rate was 10% on average, followed by 5% in the second year and 3% to 4% thereafter. The main cause of death is sudden death (within 1 hour) almost equal to non-sudden death in the first six months after hospitalization. Many grading studies of post-MI risk have shown the association between certain clinical factors and cardiogenic death. Recent studies have emphasized the importance of functional or physiological components in the classification of risk after myocardial infarction. From many dangers