Xiao Wang is a secondary school teacher, is recognized among colleagues very good health, he arranged his life in a colorful way. That afternoon to the school gym to play basketball all afternoon, in the evening and a few friends drank some wine, and then a few good friends together to stay up all night to watch the game, at 2:00 a.m. suddenly shouted and fell to the ground, unconscious, friends rush to call 120, in the ambulance cardiac monitoring prompted ventricular fibrillation, the time is still delayed too long, repeated resuscitation or unsuccessful. Xiaoyun is a female student of a university in Zhejiang, usually there is no physical discomfort, recently caught a cold, nasal congestion, cough, sore throat, but also a little weakness chest tightness, also did not pay too much attention to their own anti-inflammatory drugs and cold medicine. On the third day of class, he suddenly fainted several times and was rushed to the hospital emergency room, where an electrocardiogram revealed recurrent ventricular tachycardia, which eventually evolved into ventricular fibrillation, and was considered fulminant viral myocarditis, which was not resuscitated, much to our regret. Sudden death is often referred to as an unanticipated death that occurs suddenly within one hour after the onset of the disease. There are about 540,000 sudden deaths due to cardiac causes in China every year, and malignant arrhythmia is the most important cause of sudden cardiac death, accounting for about 80%. Arrhythmias are very common in clinical practice, and almost everyone has had an arrhythmia in their lifetime, only some arrhythmias are not felt because there are no symptoms. There are many types of arrhythmias, not all of which require treatment, and only malignant arrhythmias can cause sudden death. Some of the common causes of sudden death include: viral infection cold, excessive mental stress, excessive sadness, excessive fatigue, unreasonable medication (especially anti-arrhythmic drugs), heavy smoking, excessive alcohol consumption, staying up late, too intense exercise, etc. It is difficult to completely prevent the occurrence of arrhythmia, but we can take some measures to minimize the occurrence of arrhythmia and sudden death. Maintain a good routine, keep a calm mind, avoid great joy and sadness, do not be overly stressed and fatigued, exercise in moderation, avoid staying up late for a long time, and reduce the intake of alcohol and tobacco. If you have symptoms such as palpitations and chest tightness, you can consult a doctor in time. After entering middle age, you can check the electrocardiogram regularly, avoid abusing some drugs that may cause arrhythmia, and treat the cold in time. Pay attention to the usual physical health care. Control blood pressure, blood sugar, blood lipids and other risk factors to prevent the occurrence of coronary heart disease. Once the arrhythmia is diagnosed, some arrhythmias can be treated by catheter ablation if necessary, and most of them can be cured radically. Catheter ablation is also very effective in patients with post-myocardial infarction ventricular tachycardia, for example. Implantation of an implantable cardioverter-defibrillator (ICD) can be considered as the best method of preventing sudden cardiac death in patients diagnosed as being at high risk for sudden cardiac death or in patients who have already had a malignant arrhythmia that is likely to recur. In addition, if possible, placing automated external defibrillators (AEDs) in many public places and making defibrillation and other first aid techniques available to the public are also important ways to reduce sudden cardiac death.