Coronary heart disease is the most common type of vascular disease caused by atherosclerosis and is a common disease that harms human health, often occurring in men over the age of forty. Men tend to develop the disease earlier than women. It is defined as atherosclerosis of the coronary arteries, causing narrowing or occlusion of the lumen, leading to myocardial ischemia, hypoxia, or necrosis, and resulting in heart disease. Currently, the diagnostic gold standard for coronary heart disease is coronary angiography. During coronary angiography, the presence of significant stenosis in the coronary artery lumen of more than fifty percent can diagnose coronary artery atherosclerotic heart disease, or coronary heart disease. The pathological anatomy and pathophysiology of coronary heart disease vary, leading to different clinical manifestations. In 1979, the World Health Organization classified it into five types: 1. Asymptomatic myocardial ischemia. 2. Angina pectoris. 3. Myocardial infarction. 4. Ischemic cardiomyopathy. 5. Sudden death. Currently, based on different characteristics of onset and principles of treatment, it is divided into two main categories: First category: Chronic coronary artery disease. Second category: Acute coronary syndrome. Acute coronary syndrome includes unstable angina, non-ST segment elevation myocardial infarction, ST-segment elevation myocardial infarction, and sudden death is also included as a manifestation of acute coronary heart disease.