Successful Catheter Ablation of Atrial Fibrillation in a Patient With an Abnormal Septum in the Left Atrium

Abstract

the LA into 2 parts, a main chamber (MC) and an accessory chamber (AC). In addition, a fenestration was observed in the posteroinferior side of the membrane (Figure A–D). The right and left pulmonary veins (PVs) were connected to the AC and the MC, respectively. The fossa ovalis was A 50-year-old man underwent catheter ablation for symptomatic paroxysmal atrial fibrillation. Preprocedural cardiac computed tomography showed an abnormal septum extending from the interatrial septum to the posterior wall of the left atrium (LA) that divided