The diagnostic criteria of acute myocardial infarction are as follows: I. Clinical symptoms, the typical angina pectoris symptoms of acute myocardial infarction are pressure-like pain in the precordial area and retrosternal area, accompanied by profuse sweating, near-death feeling and choking feeling, and the inclusion of nitroglycerin tablets or quick-acting heart pills cannot make the symptoms relieved. Second, typical ECG manifestations, such as pathological Q waves, ST-segment elevation, or pathological ST-segment depression, with changes in corresponding leads. Third, elevated cardiac enzymes, including CK, CK-MB and troponin. With two of the above three indicators, a diagnosis of acute myocardial infarction can be made.