Radiofrequency circumferential ablation limited to the left atrium showing fibrillatory activity in a patient with paroxysmal atrial fibrillation.

We report a case of a tailored approach to atrial fibrillation based on the substrate. In a patient with paroxysmal atrial fibrillation, electroanatomic mapping showed that atrial fibrillation was limited to a large area around the ostia of right pulmonary veins. The patient was successfully treated by catheter anatomic isolation of this area from the remaining part of the left atrium.