Sudden heart attack, the main first aid measures are to remove the trigger, rest, chewing aspirin or clopidogrel, containing nitroglycerin or fast-acting heart pills, etc., and quickly send to the hospital after taking the medicine. Patients with a history of coronary artery disease, if sudden onset of pressure pain in the precordial region, accompanied by profuse sweating and a sense of near death, then it is likely to be the occurrence of acute myocardial infarction. Patients are advised to remain calm and quickly chew aspirin or clopidogrel, take nitroglycerin or quick-acting heart pills. Then call 120 for an ambulance and briefly explain your symptoms. Then continue to sit and rest and do not move, otherwise increased myocardial oxygen consumption will increase the scope of the infarction. If oxygen is available at home, it can be inhaled to facilitate myocardial oxygenation. Usually in the ambulance will complete the ECG examination and some pre-hospital emergency treatment. Meanwhile, the patient will be sent directly to a hospital with a green channel for heart attack, and will be sent directly to the catheterization laboratory and undergo coronary angiography. If a blocked vessel is found during the examination, this diseased vessel will be opened in the first instance and then admitted to the CCU to continue subsequent treatment.