Electrical defibrillation: also known as asynchronous electrical cardioversion, refers to the method of ventricular flutter and ventricular fibrillation, because the QRS complex and T wave cannot be distinguished, and the QRS complex on the electrocardiogram is not synchronized with the direct current, so that the ventricular flutter or ventricular fibrillation is transformed into sinus rhythm. The absolute indication for asynchronous defibrillation is ventricular fibrillation. The patient's autonomic rhythm is not required for electrical stimulation, so it is called asynchronous defibrillation.