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Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
12:45

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing

Published on: December 11, 2017

Extraordinarily favorable left ventricular reverse remodeling through long-term cardiac resynchronization:

Özlem Çelebi1, Thomas Knaus, Florian Blaschke

  • 1Department of Cardiology, Charité-Universitaetsmedizin Berlin-Campus Virchow-Klinikum, Berlin, Germany.

Pacing and Clinical Electrophysiology : PACE
|May 5, 2012
PubMed

Insights

Cardiac resynchronization therapy (CRT) significantly improves heart function in some chronic heart failure (CHF) patients. Key predictors of exceptional response include a dilated left ventricle (LV) from nonischemic heart disease and significant electromechanical changes.

Area of Science:

  • Cardiology
  • Heart Failure Research
  • Medical Device Technology

Background:

  • Chronic heart failure (CHF) patients often exhibit varied responses to cardiac resynchronization therapy (CRT).
  • Understanding predictors of superior left ventricular (LV) remodeling after CRT is crucial for optimizing patient outcomes.
  • This study investigates factors associated with an exceptionally positive response to CRT.

Purpose of the Study:

  • To identify patient characteristics that predict an extraordinary improvement in left ventricular (LV) remodeling following cardiac resynchronization therapy (CRT).
  • To differentiate between high and low responders to CRT based on baseline clinical and electrophysiological parameters.

Main Methods:

  • A cohort of 136 patients with chronic heart failure (CHF) and left bundle branch block (LBBB) receiving CRT was analyzed.
  • Left ventricular end-diastolic diameter (LVEDD) changes were measured after CRT, comparing patients with LVEDD reduction beyond the 80th percentile (high responders) to others (low responders).
  • Baseline assessments included LV pre-ejection interval (LVPEI), interventricular mechanical delay (IVMD), LV dyssynchrony (SDEMD), exercise capacity (pVO(2)), and ventilatory efficiency (VE/VCO(2)).

Main Results:

  • High responders (n=22) showed a significant reduction in LVEDD compared to low responders.
  • High responders were more likely to have nonischemic heart disease, a wider QRS duration, longer LVPEI, greater IVMD, larger baseline LVEDD, and higher SDEMD.
  • Pre-CRT functional capacity, indicated by higher pVO(2) and lower VE/VCO(2), was better in high responders.

Conclusions:

  • Exceptional reverse LV remodeling with CRT in CHF and LBBB is associated with a particularly dilated LV.
  • Nonischemic heart disease and pronounced electromechanical alterations are linked to superior CRT response.
  • A relatively preserved functional capacity before CRT appears important for achieving extraordinary remodeling benefits.
Abstract

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