Atrial fibrillation is the loss of the normal regular diastolic activity of the heart muscle, replaced by rapid and uncoordinated weak peristalsis, resulting in the loss of the normal effective contraction of the atria. The prevalence of atrial fibrillation in China is 6-10% in people over 65 years old. Professor Yuan Yiqiang of Zhengzhou Cardiovascular Hospital said that atrial fibrillation, because the atria have no contraction function, blood is easily stagnant in the atria and form thrombus, thrombus off can lead to stroke. Studies have shown that patients with atrial fibrillation have a five-fold increased risk of stroke compared to normal people. He pointed out that the high incidence of atrial fibrillation, high disability rate, multiplying the risk of death, seriously endangering human health and quality of life, but the public knowledge of the hazards and prevention of atrial fibrillation is seriously inadequate, and there are still many misconceptions. For example, the most important hazard of atrial fibrillation is thromboembolism, especially cerebral embolism (stroke), which is the most direct cause of death in patients with atrial fibrillation. And taking anticoagulant drugs is the most effective measure to reduce death in patients with atrial fibrillation, but many patients are reluctant to use anticoagulant drugs because they are worried about the risk of bleeding from the drugs; some patients often mistakenly believe that atrial fibrillation is not harmful or less harmful because they have no symptoms. These misconceptions can only improve the health of patients if they rely on health education and are relayed to the community. The public in China has a serious lack of knowledge about the hazards and prevention of atrial fibrillation. Both domestic and international guidelines recommend that patients with atrial fibrillation need to receive anticoagulation therapy to reduce mortality, but relevant epidemiological studies show that less than 10% of patients with atrial fibrillation receive anticoagulation therapy in China. Atrial fibrillation is the most common persistent arrhythmia, and the main hazards of atrial fibrillation are as follows: Hazard 1: blood stagnation in the atria is prone to the formation of thrombus, which can lead to cerebral embolism; Hazard 2: frequent episodes of atrial fibrillation can lead to atrial enlargement; Hazard 3: frequent episodes of atrial fibrillation can lead to panic, dizziness and even syncope; Hazard 4: rapid atrial fibrillation can cause severe heart failure, which can lead to death if not treated in a timely manner; Hazard 5: rapid atrial fibrillation can cause severe heart failure. Hazard 5: Atrial fibrillation can lead to a decrease in cardiac function and reserve function of the patient.