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Related Experiment Video

Updated: Nov 18, 2025

Translational Rabbit Model of Chronic Cardiac Pacing
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Optimized single-point left ventricular pacing leads to improved resynchronization compared with multipoint pacing.

Rodolfo San Antonio1,2,3, Eduard Guasch1,2,3, Ana González-Ascaso4

  • 1Institut Clínic Cardio-Vascular, Hospital Clínic, University of Barcelona, Barcelona, Catalonia, Spain.

Pacing and Clinical Electrophysiology : PACE
|February 4, 2021
PubMed
Summary

Single-point pacing (SPP) optimized with fusion-optimized intervals (FOI) provides superior cardiac resynchronization therapy (CRT) outcomes, including better QRS shortening and longer battery life, compared to multipoint pacing (MPP). This approach enhances CRT effectiveness without compromising device longevity.

Keywords:
battery longevitycardiac resynchronization therapyelectrocardiographic imagingfusion-optimized intervalsmultipoint pacing

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Medical Devices

Background:

  • Multipoint pacing (MPP) in cardiac resynchronization therapy (CRT) improves left ventricular activation but reduces battery longevity.
  • Fusion-optimized intervals (FOI) method offers superior reverse remodeling compared to standard CRT programming.
  • A need exists to compare MPP with FOI-optimized single-point pacing (SPP) for CRT effectiveness.

Purpose of the Study:

  • To evaluate if MPP can achieve better cardiac resynchronization than SPP optimized by the FOI method.
  • To compare the efficacy of different pacing configurations on QRS duration and biventricular activation.
  • To assess the impact of pacing strategies on estimated device battery longevity.

Main Methods:

  • A prospective study involving 32 patients with CRT devices capable of MPP.
  • Measurement of QRS duration during intrinsic rhythm and three pacing configurations: MPP, SPP-FOI, and MPP-FOI.
  • Biventricular activation times assessed using electrocardiographic imaging (ECGI) in 14 patients; battery longevity estimated at 45-day follow-up.

Main Results:

  • SPP-FOI demonstrated significantly greater QRS shortening (-56 ± 16 ms) than MPP (-42 ± 17 ms).
  • MPP-FOI did not provide further QRS shortening compared to SPP-FOI (p = .69).
  • Estimated battery longevity was longer for SPP (8.1 ± 2.3 years) than for MPP (6.3 ± 2.0 years).

Conclusions:

  • SPP optimized by FOI yields superior QRS shortening and longer battery duration compared to MPP.
  • FOI-based optimization is a promising strategy for enhancing CRT outcomes.
  • The findings suggest SPP-FOI is a more effective and sustainable approach for CRT.