The ABCDE principles of coronary artery disease treatment are mainly used for the secondary prevention of coronary artery disease, which is a preventive medication and strategy for patients at high risk of coronary artery disease or with a clear diagnosis of coronary artery disease. A stands for aspirin and ACEI, which are angiotensin-converting enzyme inhibitors; B stands for beta-blockers, which are also known as betalactam, and blood pressure control. C stands for smoking cessation and cholesterol lowering; D stands for proper diet and diabetes control; E stands for health promotion and exercise.