CAD in medical terms means coronary heart disease, also known as coronary atherosclerotic heart disease, refers to the narrowing of one or more of the three coronary arteries on the surface of the heart, coronary angiography, found that the narrowing of the heart vessels more than 50% can be defined as coronary heart disease; narrowing of more than 70%-75% will often clinically appear severe myocardial ischemia caused by chest pain, chest tightness, shortness of breath, and The stenosis exceeds 70%-75%, then clinically there is often severe myocardial ischemia that causes chest pain, chest tightness, shortness of breath, panic attacks, etc. Therefore, CAD is medically called coronary artery disease. Patients with coronary artery disease can be treated with primary or secondary prevention of coronary artery disease, including antiplatelet drugs, lipid regulating and stabilizing therapy, coronary artery dilation therapy, and myocardial nutrition to improve cardiac microcirculation; in addition, patients with coronary artery disease combined with cardiac insufficiency can be treated with ACEI drugs to reverse ventricular remodeling, beta-blockers to reduce cardiac oxygen consumption, and aldosterone inhibitors to inhibit RAS. and aldosterone inhibitors to inhibit the RAS system and reduce water and sodium retention.