Background: Complete heart block is a known complication after transcatheter aortic valve replacement (TAVR), often requiring pacemaker implantation within 24 hours of the procedure.However, clinical markers for delayed progression to complete heart block after TAVR remain unclear. Objectives:We examined electrocardiographic data that may correlate with delayed progression to complete heart block and need for pacemaker.Methods: This is a single-center retrospective study of 608 patients who underwent TAVR between April 2008 and June 2017. We excluded 164 (27.0%) patients due to having a pacemaker before the procedure or expiring within 24 hours of the procedure (8, 1.3%). We excluded an additional 50 (8.2%) patients who received a pacemaker within 24 hours of the procedure. Electrocardiograms (EKGs) obtained after the procedure were compared to the preprocedural EKG to detect new changes.Results: Left bundle branch block, intraventricular conduction delay, left anterior fascicular block, and right bundle branch block were the most commonly seen conduction abnormalities after TAVR (25.1%, 10.9%, 7.5%, and 3.6%, respectively). Both left bundle branch block (odds ratio [OR] = 2.77 [95% confidence interval (CI): 1.24-6.22]) and right bundle branch block (OR = 13.2 [95% CI: 4.18-41.70]) carried an increased risk of pacemaker implantation after TAVR. Additionally, ΔPR greater than 40 ms from baseline also carried an increased risk of pacemaker implantation (OR = 3.53 [95% CI: 1.49-8.37]). Conclusion:Left bundle branch block, right bundle branch block, and ΔPR greater than 40 ms were all associated with delayed progression to complete heart block and need for pacemaker implantation after TAVR. K E Y W O R D SEKG, pacemaker implantation, transcatheter aortic valve replacement 846

Background: Left ventricular assist device (LVAD) implantation is a lifesaving intervention in advanced heart failure. However, LVAD is not without complication. In this case, an inadvertent intraperitoneal driveline caused small bowel obstruction, subsequently requiring pexy of the driveline to the abdominal wall to avoid future complications.Case presentation: A 37-year-old male with worsening, nonischemic, dilated cardiomyopathy underwent LVAD implantation. Postoperative day (POD) 15 he developed small bowel obstruction, and abdominal exploration showed transition point at an inadvertently placed intraperitoneal LVAD driveline. The patient was LVAD-dependent precluding removal, so the driveline was secured to the anterior abdominal wall. He subsequently improved and was discharged.Conclusions: While LVAD is increasingly common for heart failure patients, the tunneled driveline may inadvertently enter the peritoneal cavity where it can cause significant morbidity. In this case, we propose securing the driveline to the abdominal wall to prevent complications when LVAD removal is not an option.