The indications for non-synchronous electric defibrillation are: First, the presence of malignant arrhythmogenic diseases, such as ventricular tachycardia, ventricular fibrillation and other life-threatening and life-threatening heart diseases, need to perform non-synchronous electric defibrillation in a timely manner; Second, cardiac arrest, if the sudden cardiac arrest, ECG in a straight line, need to give cardiopulmonary resuscitation in a timely manner, while giving non-synchronous electric defibrillation treatment to save life in a timely manner; Third, in Without cardiac monitoring, if the patient has loss of consciousness, respiratory arrest and cardiac arrest, it is also necessary to perform cardiopulmonary resuscitation as soon as possible and non-synchronous electric defibrillation at the same time to save life in time. In short, non-synchronous electric defibrillation is suitable for the rescue treatment of critical patients.