The common types of arrhythmias that cause cardiac arrest are as follows: 1. Ventricular fibrillation, which is the most common arrhythmia that causes cardiac arrest. In ventricular fibrillation, the patient’s heart has almost no blood ejection. If electrical defibrillation and chest compressions are not performed immediately, the patient’s myocardial cells will suffer irreversible damage and necrosis within 5-6 minutes; 2. Cardiac arrest can also be seen in sick sinus node syndrome and severe bradycardia.