Coronary heart disease is a type of heart disease in which atherosclerosis of coronary arteries causes narrowing of the lumen of blood vessels and leads to insufficient blood supply to the heart muscle. It is a common disease in middle-aged and old-aged populations, and seriously jeopardizes the health of human beings. Coronary heart disease is mainly divided into five clinical types, namely, asymptomatic myocardial ischemia, angina pectoris, myocardial infarction, ischemic cardiomyopathy and sudden cardiac death. The following is a specific introduction to the clinical manifestations of different types of coronary heart disease according to the patient’s subtype. Asymptomatic myocardial ischemia Patients with asymptomatic myocardial ischemia do not have obvious symptoms of chest tightness, chest pain and palpitations, which are mostly found after serious coronary artery disease (e.g. myocardial infarction). Many patients do not experience angina even though they have extensive coronary artery stenosis, and some patients do not experience angina even when they have a myocardial infarction. Most of these patients will find the manifestations of myocardial infarction during routine physical examinations such as electrocardiogram and cardiac ultrasound, while most patients with asymptomatic myocardial ischemia will only have myocardial ischemia electrocardiogram changes during electrocardiogram, or will only be found when they undergo exercise test or coronary artery examination. Although these patients have no obvious clinical manifestations, studies have shown that the incidence of sudden cardiac death and serious cardiovascular events in this group of people is the same as that of people with typical symptoms of angina pectoris, and therefore need to be highly valued. Angina pectoris Typical symptoms of angina pectoris mainly manifested as: pressure, stuffiness, pain in the posterior sternum or precordial region, often radiating to the left shoulder and arm, jaw, throat and back, sometimes accompanied by panic, shortness of breath and other symptoms, generally symptoms last 1-5 minutes, occasionally up to 15 minutes, after rest and containing the “quick-acting heart pill”, Nitroglycerin” can be quickly relieved by resting and taking “quick-acting heart pills” or “nitroglycerin”. This kind of symptoms usually occurs in strenuous activities, exertion, emotional excitement, cold, full meals and other situations that increase the oxygen consumption of the myocardium. Angina pectoris also includes stable angina and unstable angina, the former refers to angina attack site, frequency, severity, duration, triggering conditions, and relief basically stable, while unstable angina refers to the original stable angina attack frequency, duration, severity increased, or new angina (within 1 month), or resting angina attack. Unstable angina and the risk of acute myocardial infarction, so once the manifestation of unstable angina, should immediately go to the hospital. Third, myocardial infarction Myocardial infarction typical symptoms are: sudden persistent posterior sternal or precordial region of severe pain, pressure, stuffiness, dying feeling, often radiating to the left shoulder and arm, jaw, throat and back, sometimes accompanied by profuse sweating, panic, shortness of breath, restlessness, nausea, vomiting, extreme fatigue, difficulty in whistling, etc., and the symptoms persist for more than half an hour, after resting and containing the chemotherapy. The symptoms persist for more than half an hour and cannot be relieved by resting and taking “quick-acting heart-saving pills” or “nitroglycerin”. Myocardial infarction is often preceded by the manifestation of unstable angina, accompanied by significant discomfort and fatigue. The risk of death from myocardial infarction is extremely high, and once the above symptoms appear, it is often suggested that the patient may have developed into an acute myocardial infarction. Should immediately call the emergency telephone line emergency examination perfect, electrocardiogram, cardiac ultrasound, myocardial necrosis markers examination and other tests and laboratory tests. Clearly myocardial infarction should be carried out as soon as possible after the coronary artery examination and interventional therapy, open the blood vessels, save lives. Fourth, ischemic cardiomyopathy ischemic cardiomyopathy belongs to a special type of coronary heart disease or advanced stage, refers to the coronary artery atherosclerosis caused by long-term myocardial ischemia, resulting in myocardial diffuse fibrosis, resulting in clinical syndromes. Its typical manifestations mainly include: the original clinical manifestations of angina pectoris; the manifestations of heart failure, such as fatigue, decreased activity endurance, palpitations, exertional dyspnea, sedentary dyspnea, and nocturnal paroxysmal dyspnea, edema, decreased appetite, and abdominal distension. In addition, various types of arrhythmia can appear in the course of ischemic cardiomyopathy, especially ventricular pre-systole, atrial fibrillation and bundle branch conduction block. Fifth, sudden death coronary heart disease Sudden death coronary heart disease is due to ischemia caused by myocardial cell electrophysiological activity is abnormal, and the occurrence of serious arrhythmia. Often manifested as usually no history of heart disease or only mild symptoms of heart disease, the condition is basically stable, no obvious external causes, not trauma or self-inflicted injuries, due to myocardial failure or mechanical failure so that the heart loses the effective contraction and sudden death.