The danger of arrhythmia depends on the type of arrhythmia, such as premature beats. Severe premature beats are still more dangerous, on the one hand, they can affect the quality of life and cause restlessness, and the frequent occurrence of severe premature beats can affect the heart function, causing chest tightness, breath-holding, wheezing, and a significant decrease in exercise. The other is atrial fibrillation, atrial fibrillation is still more harmful, mainly because atrial fibrillation is easy to form blood clots, blood clots can cause cerebral infarction, limb embolism and so on, will seriously affect the quality of life. In addition, atrial fibrillation also has serious damage to cardiac function, and the heart rate of atrial fibrillation should be actively controlled, and if possible, converted to sinus rhythm, which is a normal heart rate. Ventricular arrhythmias, such as ventricular tachycardia and ventricular fibrillation, can easily endanger life and cause syncope and sudden death, so this arrhythmia should be treated as soon as it is detected.