I. What is atrial fibrillation? Atrial fibrillation (AF) is the most common persistent arrhythmia, with an incidence of more than 5% in elderly people over 65 years old. Atrial fibrillation not only makes patients feel panic, shortness of breath, chest tightness, weakness, mental discomfort obviously affect their normal work and life, but also aggravates the original heart failure and angina symptoms, long-term atrial fibrillation or frequent atrial fibrillation also easily lead to stroke, resulting in hemiplegia. The harm of atrial fibrillation is mainly in three aspects: 1, affect the quality of life: patients have palpitations, chest tightness, dizziness and other symptoms; 2, increase the risk of thromboembolic events: can be manifested as hemiplegia (stroke), severe abdominal pain (mesenteric artery embolism) and blackening of the limbs (limb artery embolism); 3, lead to changes in the structure of the heart: long-term atrial fibrillation can cause heart enlargement, leading to or aggravating heart failure. Second, which patients are suitable for atrial fibrillation catheter ablation? 1, frequent episodes or paroxysmal or persistent atrial fibrillation of short duration, which obviously affects the quality of life; 2, more than one antiarrhythmic drugs are ineffective, or antiarrhythmic drugs are not tolerated (side effects), or unwilling to drug therapy; 3, no significant left atrial enlargement (left atrial diameter).