A, angina symptoms: is insufficient coronary artery blood supply, myocardial acute, temporary ischemia and hypoxia caused by the clinical syndrome. The attack is characterized by paroxysmal anterior chest crushing pain sensation, mainly located in the posterior part of the sternum, can be radiated to the precordial area and the left upper limb, lasting several minutes, often occurs during labor or emotional excitement, the symptoms disappear after body rest or containing nitrate drugs (such as nitroglycerin). This disease is mostly seen in men, most patients are over 40 years old. 1.Site: mainly after the upper or middle part of the sternal body, it can spread to the precordial area, with a palm-sized range, often radiating to the left inner arm up to the ring finger or little finger, the left shoulder. 2.Nature: Chest pain is often compressive, stuffy or constrictive, sometimes as if there is a heavy object pressing on the chest, occasionally accompanied by a feeling of near death. 3. Causes: It is often triggered by labor or emotional excitement (such as anger, anxiety, overexcitement, etc.), and can also be triggered by satiety, cold, smoking, bowel movements, tachycardia, shock, etc. The pain occurs at the time of exertion and not after a day or a bout of exertion. Typical angina pectoris occurs under similar conditions. 4, duration: the pain appears and gradually worsens, gradually disappears within 3-5 minutes, lasts generally less than 15 minutes, mostly relieved after stopping the original triggering activities, sublingual nitroglycerin can also be relieved within a few minutes, can be several days or weeks once a seizure, can also be several times a day. 5. Other symptoms: increased heart rate, increased blood pressure, anxious expression, cold skin or cold sweat, etc. during an attack. Symptoms of myocardial infarction: 1, pain: is the first symptom, the site and nature of the pain is the same as angina pectoris, but mostly without obvious causes, and often occurs in quiet, heavy, longer duration, up to several hours or days, rest and nitroglycerin tablets can not relieve. Patients are often irritable, have cold sweats, fear, or a feeling of near death. A few patients have no pain and start with shock or acute heart failure. Some patients have pain in the upper abdomen. 2, systemic symptoms: fever, tachycardia and other symptoms, body temperature is usually around 38 ℃, rarely more than 39 ℃. 3, gastrointestinal symptoms: when the pain is severe, it is often accompanied by frequent nausea, vomiting and epigastric distension, flatulence, and in severe cases, erratic rebellion may occur. 4.Cardiac arrhythmia: mostly occurs within 1-2 weeks after the onset of the disease, but most common within 24 hours. Often accompanied by weakness, dizziness, fainting and other symptoms. 5. Hypotension and shock: systolic blood pressure is less than 80 mmhg, with irritability, pallor, wet and cold skin, thin and rapid pulse, profuse sweating, and decreased urine output (per hour). Third, complications: 1, papillary muscle dysfunction or rupture: resulting in mitral valve closure insufficiency, which can cause heart failure. 2, heart rupture: rare, often appear within a week of onset, causing acute pericardial tamponade and sudden death. 3.Check plug: mostly occurs in the brain, mesentery, extremities and other parts. 4, ventricular wall tumor: mainly seen in the left ventricle, prone to intractable heart failure and arrhythmia. 5.Ventricular septal perforation: mostly occurs within one week of infarction, manifesting as aggravation of the original symptoms, heart failure and shock.