The key points of clinical diagnosis of acute myocardial infarction are as follows: 1. Clinical symptoms with typical chest pain, which is posterior sternal crush-like, suffocating-like pain, with a sense of imminent death, accompanied by profuse sweating, nausea, persistent unrelieved, people with previous coronary heart disease or high risk factors for atherosclerosis; 2. Patients with electrocardiogram appearing T-wave hyperacute, typical electrocardiogram appearing ST-segment arch-back up elevation, such as inferior myocardial infarction appearing two-lead, three-lead, avF leads, ST-segment arch-back up elevation, anterior myocardial infarction with chest leads, V1, V2, V3, V4, ST-segment arch-back up elevation, typical arrow changes suggesting acute ST-segment elevation myocardial infarction; 3. myocardial enzymatic changes, clinically using myocardial characteristic enzymes, such as troponin or CKMB. if the patient has the above three conditions, clinical diagnosis of acute myocardial infarction can be made. The patient needs to be rescued urgently by coronary intervention or thrombolytic therapy and transferred to the cardiology care unit for resuscitation.