Electrical cardioversion, or cardiac electrical cardioversion, is a method of passing an electric current of a certain strength through the heart to restore tachyarrhythmia to sinus rhythm. Electrocardiography is an important emergency measure in clinical practice, which is a method of passing a certain strength of electric current through the heart, so that atrial fibrillation, ventricular fibrillation, ventricular tachycardia and other tachyarrhythmias can be reversed to sinus rhythm; it needs to be operated by professional medical personnel. Electrorevolution, the electrode plate surface needs to be coated with conductive paste, the distance between the two electrode plates shall not be less than 10cm, the discharge needs to be left by the bystanders, not to contact the patient, so as not to cause adverse effects. Electrorecovery should be operated by professional personnel, and should not be used blindly by oneself to avoid causing adverse effects.