Physiologic Cardiac Pacing to Prevent Left Ventricular Dysfunction Post TAVI

This study is comparing two types of pacemaker technology — conventional right-ventricular pacing versus physiologic cardiac pacing (which tries to mimic the heart's natural electrical pathway) — in patients who develop heart conduction problems after a transcatheter aortic valve implantation (TAVI), a minimally invasive procedure to replace a diseased heart valve. **You may be eligible if...** - You recently had a TAVI procedure (within the past 30 days) - You developed a heart conduction problem (such as a heart block) after TAVI that requires a permanent pacemaker - You are at least 18 years old - You have given written informed consent **You may NOT be eligible if...** - You had a pacemaker implanted before your TAVI procedure - Your conduction problem developed more than 30 days after TAVI - You are unable to give informed consent - Certain anatomical or technical factors make one type of pacing lead placement impossible Talk to your doctor to see if this trial is right for you.