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Optimization of ventricular function by improving the activation sequence during ventricular pacing

F W Prinzen1, M F Van Oosterhout, W Y Vanagt

  • 1Department of Physiology, Cardiovascular Research Institute Maastricht (CARIM), Rotterdam, The Netherlands.

Pacing and Clinical Electrophysiology : PACE
|November 24, 1998
PubMed
Summary
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Optimizing ventricular pacing involves selecting the best electrical activation sequence, not just minimizing asynchrony. Pacing from the left ventricular apex improves left ventricular function more than multi-site biventricular pacing.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Pacing

Background:

  • Ventricular pacing can impair left ventricular (LV) pump function due to abnormal electrical activation.
  • Optimizing LV function during pacing requires understanding the interplay between activation sequence and synchrony.

Purpose of the Study:

  • To compare strategies for optimizing LV function during ventricular pacing.
  • To investigate the impact of minimal asynchrony versus optimal electrical activation sequence on LV pump function.

Main Methods:

  • Anesthetized open-chest dogs underwent ECG and hemodynamic monitoring.
  • Measurements included cardiac output, LV pressure, and dP/dt (maximal rates of rise and fall).
  • Pacing sites included right ventricular (RV) apex, LV apex, and LV base, with biventricular pacing also tested.

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Main Results:

  • Pacing at the LV apex and base resulted in longer QRS durations (a measure of activation asynchrony) compared to RV apex pacing.
  • Despite longer QRS durations, LV apex and LV base pacing significantly improved stroke volume and LV dP/dt compared to RV apex pacing.
  • Biventricular pacing reduced QRS duration but did not enhance hemodynamic parameters beyond those achieved with LV apex pacing alone.

Conclusions:

  • The sequence of electrical activation is a more critical determinant of LV function than the synchrony of activation during pacing.
  • Selecting an optimal single pacing site, such as the LV apex, is more important for maximizing LV function than using multiple pacing sites.