OE-269 Septal, Anterior, and Posterior Left Atrium might be Vulnerable Sites for Electrical Impairment in Patients with Atrial Fibrillation(OE46,Atrial Fibrillation/Supraventricular Arrhythmia: Diagnosis 3 (A),Oral Presentation (English),The 73rd Annual Scientific Meeting of The Japanese Circulation Society)