心肌梗死主要靠胸痛(心绞痛)病史、心电图的变化以及对心脏标志物的化验来诊断。虽然典型心绞痛是急性心肌梗死的重要诊断条件,但偏偏有1/4的病人缺乏典型心绞痛,尤其是老年人更多见。心电图ST段抬高和出现Q波是两个高度提示急性心肌梗死的变化,但仅大约一半的病人就诊时有这些变化;因胸痛怀疑心肌梗死而作心电图检查的人,大约有50％在最初的 Myocardial infarction is mainly diagnosed by the history of chest pain (angina), changes in electrocardiograms, and tests of cardiac markers. Although typical angina pectoris is an important diagnostic criteria for acute myocardial infarction, but why 1/4 of patients lack typical angina pectoris, especially in the elderly are more common. ST-segment elevation and Q wave electrocardiography were two highly suggestive changes in acute myocardial infarction, but only about half of these patients had these changes at the time of their visit; approximately 50% of those who had an ECG for chest pain suspected myocardial infarction were excluded from the initial of