Giant Left Atrium Atrial fibrillatioN CathEter Ablation, Posterior Box Isolation vs. Dallas Lesion Set

"1. PVI(pulmonary vein isolation) will be performed using a radiofrequency catheter~2. Esophageal temperature will be monitored to prevent esophageal injury.~3. Evaluation of procedure time, radiofrequency ablation time~4. Evaluation of the complication after the procedure.~5. Rhythm follow-up will be performed after the procedure in accordance with the aforementioned study design."

"1. PVI will be performed using a radiofrequency catheter~2. Additional POBI(Posterior box isolation) is performed according to the traditional method and experience of the practitioner.~3. Esophageal temperature will be monitored to prevent esophageal injury.~4. The bidirectional block of each lesion set is the target of the procedures. But, we remain the incomplete block if three times of linear ablation failed to achieve the bidirectional block for the safety purpose.~5. Evaluation of procedure time, radiofrequency ablation time~6. Evaluation of the complication after the procedure.~7. Rhythm follow-up will be performed after the procedure in accordance with the aforementioned study design."

"1. PVI, POBI will be performed using a radiofrequency catheter~2. Additional AL(anterior linear) ablation is performed according to the traditional method and experience of the practitioner.~3. Esophageal temperature will be monitored to prevent esophageal injury.~4. The bidirectional block of each lesion set is the target of the procedures. But, we remain the incomplete block if three times of linear ablation failed to achieve the bidirectional block for the safety purpose.~5. Evaluation of procedure time, radiofrequency ablation time~6. Evaluation of the complication after the procedure.~7. Rhythm follow-up will be performed after the procedure in accordance with the aforementioned study design."