Myocardial infarction is more serious than angina pectoris, which not only has a large spread and lasts for a long time, but also has life-threatening effects. Therefore, before the arrival of emergency vehicles should do: 1, lie flat in place, head back, so that the airway open: within 4 hours of onset, the greatest risk of ventricular fibrillation and sudden death. 2, analgesia: nitroglycerin sublingual or quick-acting heart pills 10 oral. 3.Oxygen: oxygen should be administered immediately when available. 4.Resuscitation: If the above first aid is not effective, immediate mouth-to-mouth breathing and chest compressions should be performed at a frequency of about 100 times/minute and a depth of about 3-5 centimeters. 5.Seek help: Contact the hospital, emergency room and other relevant medical institutions as soon as possible and ask the doctor to come to the rescue or send to the hospital for resuscitation.