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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
QRS pattern and improvement in right and left ventricular function after cardiac resynchronization therapy: a
Giulia Domenichini1, Haran Burri, Cinzia Valzania
1Institute of Cardiology, University of Bologna, Via Massarenti 9, Bologna 40138, Italy.
BMC Cardiovascular Disorders
|April 13, 2012
Summary
Left bundle branch block (LBBB) predicts a positive response to cardiac resynchronization therapy (CRT), significantly improving biventricular ejection fraction. Patients without LBBB show less benefit from CRT.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Devices
Background:
- Predicting patient response to cardiac resynchronization therapy (CRT) is crucial for optimizing treatment outcomes.
- Baseline QRS patterns are being investigated as potential predictors of CRT efficacy.
Purpose of the Study:
- To evaluate the predictive role of baseline QRS patterns in determining response to CRT.
- To assess the impact of QRS patterns on biventricular ejection fraction (EF) improvement.
Main Methods:
- 56 patients undergoing CRT implantation were analyzed.
- Radionuclide angiography was used for baseline and mid-term follow-up EF assessment.
- Phase analysis evaluated mechanical dyssynchrony, correlating it with QRS patterns and EF changes.
Main Results:
- Left bundle branch block (LBBB) patients showed significantly greater LVEF improvement (+9.6%) compared to non-LBBB patients (+2.6%).
- CRT response (≥5% LVEF increase) was observed in 68% of LBBB patients versus 24% of non-specific IVCD patients.
- LBBB was the sole independent predictor of LVEF response (OR, 7.45; p=0.006).
Conclusions:
- A baseline left bundle branch block (LBBB) pattern is a strong indicator of positive CRT response.
- Patients with LBBB experience significantly greater biventricular improvement following CRT compared to those with other QRS patterns.
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