CPR is the main means of resuscitating sudden death, and CPR must be performed continuously at the scene, and cannot be terminated arbitrarily, usually in the following three cases: 1) the patient is resuscitated, with spontaneous breathing and heartbeat restored; 2) other professionals take over, or others help to resuscitate together, taking turns to perform CRP resuscitation; 3) a professional physician arrives and determines that the patient has died. If the patient is en route to the hospital, CPR must continue to be performed to ensure the quality of CPR and to provide assistance to the patient for advanced life support at the hospital. If a patient undergoes cardiac arrest, CPR can be performed for 30 minutes if CPR is performed for more than 60 minutes and the patient still has no vital signs manifested or is not seen in cardiac arrest and CPR has been performed for more than 15 minutes prior to CPR, and CPR can be stopped if there is no effect. if the cause of the patient’s sudden death is electrocution, drowning, carbon monoxide poisoning, or a special population such as children, CPR should be Try to extend the CPR time, because the success rate of resuscitation in these patients is relatively higher. If it is determined that the patient is brain dead, CPR can be stopped at any time.