Heart attack fainting is caused by temporary ischemia and hypoxia of the brain, which cannot maintain the normal state of wakefulness. If the heart stops beating for 6 seconds syncopal manifestations can occur. Due to the occurrence of cardiac arrest or too many sudden premature beats, the blood supply to the brain is not sufficient and the lack of blood supply to the brain can lead to the occurrence of syncope and even convulsions. It is more common in middle-aged and elderly people and should be taken seriously. When a heart attack faints, it is necessary to immediately determine whether the patient has a heartbeat or respiratory arrest, and if the heartbeat or respiratory arrest requires chest compressions and artificial respiration on the spot, and at the same time call the 120 emergency number and wait for the arrival of professional emergency personnel.