Coronary heart disease is a common clinical heart disease, which is caused by the narrowing or occlusion of the coronary arteries, the blood vessels that supply blood to the heart. Clinically, coronary artery disease has the following manifestations: 1. Angina pectoris: It is caused by a significant narrowing of the heart vessels or a transient spasm of the coronary vessels based on the narrowing, resulting in insufficient blood supply and ischemia to the myocardium in the blood supply area of the narrowed vessels when the patient is at rest or during exercise, and the patient exhibits symptoms such as episodic chest pain (pain, chest tightness, breath-holding, tightness in the chest, feeling of weight pressure, sweating, weakness, nausea, vomiting, and even fainting). The attack usually lasts no more than 15-30 minutes and can mostly be relieved by itself. According to the pathological changes and clinical situation of angina, it can be divided into stable angina and unstable angina. Stable angina refers to the patient’s angina symptoms in the past 2-3 months is relatively constant, the attack mostly has a trigger, that is to say, angina at rest does not attack, is onset of exertion or emotional excitement, trigger angina attack activity intensity, attack symptoms, duration, attack frequency, etc. is relatively constant, these patients are relatively stable, generally within a short period of time not to occur adverse consequences; and Unstable angina refers to angina attacks without obvious triggers, or within the last 1-2 months, the intensity of activity triggering angina attacks has significantly decreased, the symptoms of attacks have worsened, the duration has increased, the attacks have become more frequent, and the accompanying symptoms have increased (such as sweating, nausea, vomiting, fainting, etc.), the condition of these patients is unstable, and most of them are likely to have accidents within a short period of time (death, Myocardial infarction, etc.). 2.Acute myocardial infarction: This is due to a serious narrowing or occlusion of one of the blood supplying coronary arteries (in rare cases, two or more vessels) or its branches, resulting in persistent myocardial ischemia in the blood supply area. About 20% of patients with acute myocardial infarction die before arriving at the hospital, and if they still do not receive proper treatment after arriving at the hospital, the in-hospital mortality rate is still as high as 30%! Sudden death: This is due to sudden and severe myocardial ischemia (sudden and severe narrowing or occlusion of an important blood vessel in the coronary artery of the heart), resulting in severe cardiac dysfunction and cardiac arrest or even death before the patient has time to receive medical assistance or even to be diagnosed. 4. Heart failure: This is caused by the patient having a large and extensive myocardial infarction (one or more times) or a reduction in effective working myocardium due to prolonged severe myocardial ischemia, resulting in cardiac insufficiency. These patients often seek medical attention with heart failure as the first symptom. 5. Arrhythmia: This is mostly due to myocardial ischemia or necrosis affecting the tissues that produce the heart’s autonomous rhythm or/and agonistic conduction tissues (resulting in irregular heart rhythm and/or abnormal conduction), with varying degrees of prognostic impact, which can be lifelong untreated or instantly fatal. Among the above 5 types of coronary heart disease manifestations, the risks are unequal and the various types can transform and evolve in transition with each other. Therefore, they should be treated differently in clinical practice. Studies have shown that stable angina and arrhythmias with relatively benign manifestations of coronary artery disease are relatively mild and stable in a short period of time, and therefore do not require urgent treatment such as stenting or bypass, and only for some patients with stenosis that provides blood supply to a large area of myocardium, doctors may recommend further stenting or bypass treatment on the basis of drug therapy, while other patients generally require only stenting or bypass treatment. Other patients generally need only drug treatment and regular follow-up; while myocardial infarction manifested by sudden death requires the most urgent treatment time, requiring immediate resuscitation on site, and if possible, emergency coronary angiography as soon as possible, and revascularization treatment (mainly stent treatment) for suitable cases; coronary heart disease manifested by acute myocardial infarction requires a race against time, striving for the shortest possible time (after arrival at the hospital). In the case of unstable angina pectoris, which has a tendency to deteriorate within a short period of time (within minutes to days), the patient should be treated with caution and hospitalized for careful treatment and observation, and risk stratification based on clinical symptoms and laboratory test results should be performed to help determine the short-term prognosis. The prognosis should be determined by risk stratification based on clinical symptoms and laboratory tests. For patients with a significant tendency to deteriorate in the short term, coronary angiography should be performed as soon as possible (within 2-3 days) and stenting should be performed if necessary. It is important to note that patients with previous myocardial infarction and patients who have previously received stenting or bypass surgery for a major vessel and who experience symptoms such as angina associated with myocardial ischemia are at a significantly higher risk of cardiovascular-related death than other populations and should be given special attention and require early angiography to evaluate the vascular lesion, which may also require Re-vascularization (stenting or bypass therapy) is likely to be required. In conclusion, stenting and bypass therapy may improve prognosis, reduce symptoms, and mitigate risk in patients with stable angina due to partially significant vascular disease and in most patients with unstable angina. For the majority of patients with acute myocardial infarction and sudden death, early opening of the occluded vessel should be highly recommended, and stenting can significantly reduce mortality and improve prognosis.