CALCIFICATION IN THE BASAL SEPTUM, BUT NOT MEMBRANOUS SEPTAL LENGTH, PREDICTS AV CONDUCTION DISTURBANCE AND PACEMAKER IMPLANTATION FOLLOWING TRANSCATHETER AORTIC VALVE REPLACEMENT WITH A BALLOON-EXPANDABLE VALVE (S3)

Background: The lower end of the membranous septum (MS) represents an anatomic landmark for the emergence of the His Bundle into the left ventricle. Computed tomography (CT) assessment of the membranous septal anatomy prior to transcatheter aortic valve replacement (TAVR) may provide information