McCaffrey JA, et al. - In this review of 98 patients who underwent transcatheter aortic valve implantation (TAVI) with balloon expandable valve, mostly SAPIEN S3 (78%), researchers investigated the factors that were predictive of delayed conduction abnormalities. This study did not include patients with a preexisting pacemaker. They reviewed baseline, in-hospital, and 30-day follow-up ECGs and found that acute conduction abnormalities were predicted by predilatation, higher ratios of balloon or valve size to left ventricular outflow tract, and prior myocardial infarction and new conduction abnormalities after discharge were predicted by baseline right bundle branch block, longer baseline and discharge QRS duration, moderate or severe aortic insufficiency and atrial fibrillation. By 30-day follow-up, resolution of most new in-hospital conduction abnormalities was reported. In-hospital conduction abnormalities and delayed conduction abnormalities are related to technical aspects of TAVI and baseline conduction system disease, respectively.