Left Bundle Branch Pacing vs Right Ventricular Pacing on AHRE Burden in Patients With Preserved LVEF

This prospective, randomized controlled trial aims to evaluate the effect of left bundle branch pacing (LBBP) compared with conventional right ventricular (RV) pacing on the cumulative duration (total time) of atrial high-rate episodes (AHREs) in patients with preserved left ventricular ejection fraction (LVEF) who are expected to require frequent ventricular pacing. Atrial High-Rate Episodes (AHREs) are defined as episodes of atrial tachyarrhythmia that are automatically recorded by device diagnostics and detected by implanted cardiac devices. These episodes usually have an atrial rate ≥170 beats per minute and a duration ≥6 minutes. AHREs are linked to a higher risk of thromboembolic events and clinical atrial fibrillation (AF), and they may indicate subclinical AF or other atrial tachyarrhythmias. Chronic RV pacing has been linked to mechanical and electrical dyssynchrony, which may encourage atrial remodeling and the development of AF. LBBP provides a more physiological ventricular activation and may reduce atrial tachyarrhythmia time (AHRE time). Patients with LVEF \>50% and atrioventricular (AV) conduction disorders requiring a dual-chamber pacemaker will be randomized to either conventional RV septal pacing or LBBP.

NCT Number	NCT07250529
Lead Sponsor	University Hospital of Patras
Conditions	Atrial Fibrillation (AF), Pacemaker Therapy, Atrioventricular Block, Preserved Ejection Fraction
Enrollment	244 participants
Start Date	2026-02-05
Primary Completion	2029-04-20 (estimated)
Study Completion	2029-06-20 (estimated)
Updated on ClinicalTrials.gov	2026-03-13