Patients with chronic atrial fibrillation have a relatively high incidence rate of embolism. For instance, those with a history of embolism, valvular disease, hypertension, diabetes, elderly patients, left atrial enlargement, and coronary artery disease are at increased risk of embolism. Atrial fibrillation is an independent risk factor for stroke. As age increases, the incidence of stroke in patients with atrial fibrillation also increases annually; atrial fibrillation doubles the mortality rate of stroke and significantly increases the disability rate. At the same time, atrial fibrillation also significantly increases the risk of recurrent stroke. Studies show that the incidence of stroke within the first year after a stroke is 6.92% in patients with atrial fibrillation, compared to 4.7% in those without atrial fibrillation. Therefore, anticoagulation therapy is the primary strategy for managing atrial fibrillation.