Stachon P, Steinfurt J, van de Loo T, et al. - In this retrospective in-depth analysis, researchers investigated how different calcification patterns could influence disturbances of the conduction system in transcatheter aortic valve replacement (TAVR) patients. From consecutive transfemoral TAVRs done between 2014 and 2017 using either Edwards SAPIEN or Medtronic Evolut R valves, experts analyzed 169 preprocedural TAVR multislice computed tomography scans. They found an independent correlation between oval calcification of the left aortic cusp and a raised risk for an increment in atrioventricular block degree. In this study, an increased risk for conduction disturbances post-TAVR was observed in relation to the presence of orthogonal annular calcification. This was even more pronounced following implantation of balloon-expandable valves.