After the heart stops supplying blood, the golden 8 minutes resuscitation time is followed. Generally speaking, after the heart stops ejecting blood, the oxygen in the brain can support about 3 minutes, after 3 minutes there will be significant cerebral hypoxia, and after 8 minutes there will be brain cell death. Therefore the golden 8 minutes means that once a patient has suffered cardiac arrest, the time for resuscitation is to race against time to restore the hemodynamic stability of the body and restore the stability of the circulation as soon as possible to ensure the perfusion of the heart, brain and other vital organs. Once a patient has suffered a cardiac arrest, the rescuer next to the patient should immediately call out, tap the patient on both shoulders, and determine whether the patient is conscious. If the patient is not conscious, the aortic pulsation disappears, and the autonomic breathing stops, the patient should be immediately asked to call 120 and wait for the emergency ambulance, and at the same time perform 30:2 CPR on the patient, that is, press the chest 30 times, and then perform 2 times of artificial respiration, generally after 5 cycles to determine again whether the patient has recovered consciousness, whether there is autonomic breathing, and whether there is aortic pulsation. If there is no recovery, the patient should continue to be rescued until the ambulance or other professionals arrive for support. If the patient is not rescued in time, the patient’s cardiac arrest will eventually lead to brain death, and this time is only about 8 minutes.