Impact of Aortomitral Continuity Calcification on Need for Permanent Pacemaker After Transcatheter Aortic Valve Replacement.

Background: By virtue of its proximity to structures vital to cardiac conduction, aortomitral continuity calcification (AMCC) may help identify patients at highest risk for developing atrioventricular conduction disease requiring permanent pacemaker implantation (PPMI). We aim to determine the association of AMCC and need for PPMI after transcatheter aortic valve replacement.

Methods: Of 614 patients who underwent transcatheter aortic valve replacement (11.8% PPMI rate), we included 136 patients (age 85±8 years, 47% male) without a preexisting intracardiac device or prior valve surgery who underwent preprocedural computed tomography. We analyzed for the presence of AMCC, aortic valve calcification, and mitral annular calcification as well as quantified AMCC and aortic valve calcification score using the Agatston method. We further stratified AMCC score into 3 categories: 0, 1 to 300, and >300. End point was PPMI at 1 month after transcatheter aortic valve replacement.

Results: There were 51 (38%) new PPMIs (median time to PPMI, 5 days). Patients who underwent PPMI had a higher prevalence of AMCC than patients without PPMI (69% versus 32%; <0.0001), as well as higher median AMCC score (263 versus 0; <0.0001). There was no difference in aortic valve calcification and mitral annular calcification between patients with and without PPMI (all ≥0.09). Patients with AMCC had a 4-fold increase in odds for PPMI compared with those without (adjusted odds ratio, 4.0; =0.0026). Compared with patients with an AMCC score of 0, patients with an AMCC score >300 had greater than a 5-fold increased odds for PPMI (adjusted odds ratio, 5.7; =0.0016).

Conclusions: Presence of AMCC, particularly with AMCC score >300, is associated with the need for PPMI after transcatheter aortic valve replacement.