2.6 Electrophysiological Procedure
Pulmonary vein isolation was performed under anesthesia and noninvasive
mild sedation. Vascular access was obtained using the bilateral femoral
veins and left femoral artery. Intracardiac and superficial
electrocardiograms were recorded at a rate of 100 mm/seconds (Prucka, GE
Medical Systems). Transseptal punctures were made with the Brockenbrough
needle transseptal needle (St. Jude Medical, Minnetonka, MN, USA) under
fluoroscopy. First, pulmonary vein electrical mapping was performed with
a circular mapping catheter (Lasso, Biosense Webster, Diamond Bar, CA,
USA) via the single transseptal sheath and pulmonary vein potentials (it
was paced from the coronary sinus to separate from atrial potential
[AP]) were determined. The ablation catheter (SF-Contact force,
Biosense Webster, Diamond Bar, CA, USA) was inserted through the other
transseptal sheath, right and left
pulmonary vein isolation was performed, respectively. (Fig 2)