The electrocardiogram of coronary heart disease is mainly st-segment changes, which can be 3 kinds of st-segment depression, st-segment transient elevation and st-segment elevation. 1. st-segment depression is mainly the change of myocardial ischemia, such as stable angina pectoris, ischemic cardiomyopathy, resting angina pectoris and insidious cardiomyopathy, etc., which will lead to st-segment depression of electrocardiogram ≧0.1mv, generally because of myocardial ischemia caused by atherosclerosis. 2. Transient elevation of the st segment is a manifestation of variant angina pectoris, which is caused by coronary artery spasm. 3. Elevation of the st segment is mainly a manifestation of myocardial infarction, which is caused by atherosclerotic plaque rupture, leading to thrombosis, thus causing myocardial ischemia, which further evolves into myocardial infarction. If you consider coronary heart disease, it is recommended to go to the hospital to avoid adverse effects.