title: Acute effects of His bundle pacing versus left ventricular and right ventricular pacing on left ventricular function.
abstract: Dual-chamber pacing with His bundle pacing has theoretical advantages over conventional right ventricular (RV) apical pacing. We compared indexes of left ventricular (LV) function during acute dual-chamber pacing from the His bundle and other RV and LV pacing sites. Twelve patients (6 men; 63 +/- 11 years) with a standard indication for electrophysiologic study were included. Average QRS duration was 100 +/- 19 ms. Ejection fraction was 48 +/- 15%. A pressure-volume catheter was positioned in the left ventricle through the femoral arterial access. Pressure-volume loops were collected during atrial (AAI) and dual-chamber overdrive pacing at 82 +/- 15 beats/min after 2 minutes of hemodynamic stabilization. Ventricular pacing catheter position was randomized between the RV apex, RV septal, and free wall portions of the outflow tract, LV free wall, and His bundle. His bundle capture was verified from surface electrocardiographic morphometry using standard criteria. Atrioventricular delay was set to the P wave-His duration -10 ms to minimize the effects of fusion (96 +/- 22 ms). LV only pacing, but not His pacing, resulted in improved stroke work and stroke volume compared with alternate site RV pacing. No changes in +dP/dt, LV end-systolic pressure. LV end-diastolic pressure, or cycle efficiency, were observed between RV pacing sites. In conclusion, acute His bundle pacing did not improve LV function compared with alternate site RV pacing and may be inferior to LV pacing.
authors.affiliation: University of Florence, Florence, Italy.
authors.forename: Luigi
authors.initials: L
authors.lastname: Padeletti
authors.forename: Randy
authors.initials: R
authors.lastname: Lieberman
authors.forename: Jan
authors.initials: J
authors.lastname: Schreuder
authors.forename: Antonio
authors.initials: A
authors.lastname: Michelucci
authors.forename: Andrea
authors.initials: A
authors.lastname: Collella
authors.forename: Paolo
authors.initials: P
authors.lastname: Pieragnoli
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Ricciardi
authors.forename: William
authors.initials: W
authors.lastname: Eastman
authors.forename: Sergio
authors.initials: S
authors.lastname: Valsecchi
authors.forename: Douglas A
authors.initials: DA
authors.lastname: Hettrick
mesh_terms: D000328:Adult; D000368:Aged; D002036:Bundle of His; D002304:Cardiac Pacing, Artificial / Q000379:methods*; D004562:Electrocardiography; D005260:Female; D006352:Heart Ventricles; D006801:Humans; D008297:Male; D008875:Middle Aged; D013318:Stroke Volume / Q000502:physiology; D013599:Systole / Q000502:physiology; D016277:Ventricular Function, Left / Q000502:physiology*