Conduction System Stimulation to Avoid Left Ventricle Dysfunction

The aim of the study is to demonstrate that conduction system pacing (CSP) can preserve a normal ventricular function compared to right ventricular apical pacing (RVAP) in patients with pre-implant preserved left ventricular ejection fraction (LVEF) and a high burden of expected ventricular pacing due to atrioventricular conduction block (AV block). After informed consent signature, patients with high degree AV block and normal LVEF will be randomized to permanent pacemaker stimulation with CSP vs RVAP. All the patients have a complete evaluation before the procedure and at 3 and 6 months follow-up.