多种生理系统具有昼夜节律和季节变化。近来发现,急性心肌梗死(AMI),缺血性心脏病和心脏猝死等。皆有类似的昼夜节律;但有关AMI发病率季节变化的资料甚少。研究对象为633例AMI,平均年龄62岁,男性462例。结果发现,AMI发作有明显的昼夜节律,胸痛发作高峰集中于上午6点至12点(占全天31.6％)。冬季AMI住院人数多于夏季;住院人数最多月份为12月至2月份(占全年30.5％)。一年 A variety of physiological systems have circadian rhythms and seasonal changes. Recently found that acute myocardial infarction (AMI), ischemic heart disease and sudden cardiac death. Have similar circadian rhythms; however, little is known about the seasonal changes in the incidence of AMI. The study was performed on 633 AMI patients with a mean age of 62 years and 462 males. The results showed that, AMI seizures have a significant circadian rhythm, chest pain onset peak concentration in the morning 6:00 to 12:00 (31.6% of the day). In winter, the number of AMI hospitalizations was more than that in summer; the most frequent hospitalizations were from December to February (accounting for 30.5% of the whole year). One year