Coronary heart disease is a heart disease in which the coronary arteries on the heart, the blood vessels, develop severe atherosclerotic stenosis or obstruction, or on top of that, combined with spasm and thrombosis, causing narrowing of the lumen of the blood vessels and finally leading to myocardial ischemia or myocardial infarction. At present, the incidence is very high in China, and we often see in the media that many people have acute myocardial infarction at work in time to save their lives. Therefore, after the age of 40, you must pay more attention to regular medical checkups, and go to the hospital as soon as possible if you have chest discomfort. Myocardial infarction is an acute and serious clinical manifestation of coronary heart disease. When a coronary artery vessel is completely blocked by a blood clot, then a piece of myocardium supplied by this coronary artery will suddenly experience interruption of blood flow, resulting in acute myocardial ischemia, and the patient will experience continuous and severe retrosternal pain. Patients with large myocardial infarction or multiple myocardial infarctions are prone to ischemic cardiomyopathy due to extensive myocardial necrosis. Patients with coronary artery disease combined with diabetes mellitus often have more severe diffuse coronary artery lesions that affect a wide range of myocardium and are also prone to ischemic heart disease. In addition, patients with coronary artery disease coexisting with other heart diseases such as senile valvular disease and hypertensive heart disease are also prone to ischemic heart disease. Once this condition occurs, many people will experience symptoms of heart failure, which will gradually worsen if left untreated.