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Related Experiment Video

Updated: Mar 3, 2026

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Intra-ventricular resynchronization for optimal left ventricular function during pacing in experimental left bundle

Xander A A M Verbeek1, Kevin Vernooy, Maaike Peschar

  • 1Department of Physiology, Cardiovascular Research Institute, Maastricht University, Maastricht, The Netherlands. x.verbeek@fys.unimaas.nl

Journal of the American College of Cardiology
|August 9, 2003
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Summary
This summary is machine-generated.

Intra-ventricular resynchronization is key for optimal left ventricular function restoration in left bundle branch block hearts during pacing. Optimal atrioventricular delays depend on pacing site and baseline PQ time.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Mechanics

Background:

  • Pacing therapy aims to improve left ventricular (LV) pump function in heart failure patients with conduction abnormalities.
  • The precise relationship between LV function and measures of ventricular asynchrony remains unclear.

Purpose of the Study:

  • To determine the extent to which intra-ventricular asynchrony (intraVA) and inter-ventricular asynchrony (interVA) influence LV function during ventricular pacing in canine hearts with left bundle branch block (LBBB).

Main Methods:

  • Experiments involved LV and biventricular (BiV) pacing in canine hearts with induced LBBB.
  • Measurements included LV pressure, stroke work (SW), interVA, and intraVA using conductance catheters and electrical activation mapping.
  • Atrioventricular (AV) delays varied from 20 to 140 ms.

Main Results:

  • LBBB induction significantly increased both interVA and intraVA, while decreasing LV dP/dt(max) and SW.
  • LV and BiV pacing improved LV dP/dt(max) and SW without altering diastolic function or preload.
  • Optimal LV function recovery occurred when intraVA normalized, irrespective of interVA levels.

Conclusions:

  • Intra-ventricular resynchronization is crucial for optimizing LV systolic function through pacing in LBBB.
  • The ideal AV delay for achieving optimal resynchronization is contingent upon the pacing site and the patient's baseline PQ time.