The RF energy could be transferred to the clamp, and generate heat, which can cause local myocardial coagulation and necrosis, tissue degeneration. The lesions responsible for atrial fibrillation could be isolated without compromising the normal surrounding tissue. Thus, ectopic pacing triggers would be isolated and the fast ectopic impulse conduction would be blocked. By interrupting the macro-reentry, the reason for atrial fibrillation would be eliminated. Then the atrial fibrillation is cured. Surgical radiofrequency ablation is one of the best methods for persistent atrial fibrillation treatment.