Relationship between membranous septum length and need for pacemaker implantation after transcatheter aortic valve implantation

This retrospective analytical study included symptomatic patients with severe aortic stenosis referred for multidetector computed tomography as part of the TAVI protocol from December 2012 through October 2022. Written informed consent was obtained from all patients prior to the tomography scan. We excluded patients with bicuspid aortic valve anatomy, pacemaker carriers, and those with biological bioprosthetic valves. The aim of this study was to determine whether MS length is associated with the need for pacemaker implantation after TAVI. MS length was measured as the maximum distance from the plane of the aortic annulus to the top of the muscular portion of the ventricular septum in the coronal plane during systole (figure 1A,B).2 Qualitative variables were analyzed using the chi-square test or Fisher exact test, while quantitative variables were analyzed using the Mann-Whitney U test. P values < .005 were considered statistically significant. A receiver operating characteristic (ROC) curve was constructed to assess the predictive accuracy of MS length for pacemaker implantation. Data were analyzed using the IBM SPSS statistical software package, version 26 (United States).