Sudden clinical death is defined as a sudden loss of consciousness and cardiac arrest with sigh-like breathing or respiratory arrest. After sudden death occurs, if there is no effective treatment within 4 minutes, irreversible damage to the brain will occur, and beyond 8 minutes, the person is dead. Patients who are found to have sudden death should first perform cardiac compressions, including extrathoracic cardiac compressions and intrathoracic cardiac compressions, generally only extrathoracic cardiac compressions can be performed at the scene, the operator presses the root of the palm of the hand at the junction of the middle and lower 1/3 of the patient’s sternum, and presses the sternum vertically with shoulder force downward, the amplitude of the compressions is at least 5cm, the frequency of the compressions is 100-120 times/min, and the continuous compressions are 30 times, and 2 The patient is then assessed for consciousness and recovery of carotid artery pulsation. Before starting resuscitation, call actively, call an ambulance yourself or ask someone else, CPR cannot stop before the ambulance, and keep waiting for the arrival of the paramedics.