The most common type of arrhythmia that causes sudden cardiac death is ventricular fibrillation, which is the most dangerous of the arrhythmias and has the highest incidence of sudden death due to ventricular fibrillation. If a patient develops ventricular fibrillation, the fastest way to correct the malignant arrhythmia is to defibrillate with a defibrillator, and if one is not available, cardiopulmonary resuscitation should be applied quickly. The patient should be given chest compressions at the midpoint of both nipples, the depth of compressions should be in the middle of 5-6 cm, the frequency of compressions should be about 100-120 times/minute, then the airway should be opened and artificial respiration should be given, the ratio of compressions to ventilation should be 30:2, and so on repeatedly for 5 cycles until the defibrillator comes to the bedside to defibrillate the patient and correct the malignant arrhythmia. Cardiac arrhythmia.