Coronary heart disease is also called ischemic cardiomyopathy. When the coronary artery is atherosclerotic due to a variety of factors, the blood flow of artery lumen stenosis or occlusion is reduced, resulting in myocardial ischemia, hypoxia and even necrosis. Because coronary heart disease has different pathological anatomy and pathophysiological changes, according to the World Health Organization classification of coronary heart disease in 1979, it can be divided into the following five types.