Cardiac fibrillation for a few seconds may be due to arrhythmia and insufficient blood supply to the myocardium. Arrhythmia should be rested in bed. Insufficient blood supply to the heart muscle can be relieved by taking nitroglycerin under the tongue. 1. Arrhythmia: caused by unhealthy life habits, manifested as irregular heartbeat, sometimes fluttering, chest tightness, shortness of breath and other symptoms, bed rest, if not relieved can be treated with drugs such as lidocaine;. 2. Insufficient blood supply to the myocardium: caused by the imbalance of oxygen supply and hypoxia in the myocardium, symptoms such as chest tightness, shortness of breath, panic, etc., can be treated with aspirin or sublingual nitroglycerin and other medications to improve the symptoms of myocardial ischemia. This kind of situation must go to the regular hospital for relevant examination, clear diagnosis after diagnosis, follow the doctor’s instructions for medication.