Atrial fibrillation and ventricular fibrillation have different pathogenesis, different symptoms, different hazards, and different treatments. 1. Different pathogenesis: atrial fibrillation occurs due to abnormal electrical activity caused by atrial structural abnormalities, mostly due to arrhythmia caused by abnormal atrial refractoriness; ventricular fibrillation originates from the ventricle, and ventricular fibrillation is induced by abnormal ventricular agitation, and ventricular fibrillation can be induced by severe myocardial ischemia and electrolyte disorders. 2. Symptoms: Patients with atrial fibrillation may be asymptomatic, while severe patients may experience palpitations, chest tightness, etc. A small number of patients with severe conditions may experience a drop in blood pressure, etc. Ventricular fibrillation often occurs suddenly. Ventricular fibrillation is often sudden onset, and patients may suffer from sudden death. 3. Different hazards: Atrial fibrillation is mostly stable and can be maintained for a long time through surgery and medication, while the condition of a few patients is more serious. Ventricular fibrillation is a very serious arrhythmia, which is a common cause of sudden death. 4. Different treatments: patients with atrial fibrillation are mainly treated with ventricular rate control and anticoagulation, while some patients can be treated with radiofrequency ablation. When ventricular fibrillation occurs, rapid resuscitation is needed to prevent sudden death, and electrical defibrillation is given immediately. Atrial fibrillation and ventricular fibrillation belong to the scope of arrhythmia, patients with atrial fibrillation should be given treatment under the guidance of doctors, and ventricular fibrillation should be defibrillated immediately under the guidance of professionals.