Heart enlargement of atrial fibrillation left atrial internal diameter is generally not enlarged more than 50MM, can be considered to do ablation surgery, but also need to be combined with the patient’s physical condition to comprehensive consideration. If the atrium is only mildly enlarged, for example, cardiac ultrasound suggests that the left atrial internal diameter is below 50MM, it is completely possible to do radiofrequency ablation, but if it is more than 50MM, the success rate of radiofrequency ablation may be further reduced, and it will bring unpredictable consequences. Enlarged heart is usually accompanied by abnormal peripheral vascular flow, tortuous, is a relative contraindication to catheter ablation, and if the peripheral vascular abnormality is more serious, after the catheter ablation surgery may occur accidents, so for patients with enlarged heart, it is recommended to go to the hospital to do echocardiography and other comprehensive testing, combined with their own heart condition and the severity of the atrial fibrillation lesions to choose the appropriate surgical program! Treatment. In such cases, it is important to seek medical attention and follow the doctor’s instructions.