Key result
Conduction system pacing outperforms biventricular pacing for electromechanical resynchronization in LBBB-associated cardiomyopathy.
Why the study?
Medical therapy alone is often ineffective for LBBB-associated cardiomyopathy, creating interest in early CRT and conduction system pacing for this potentially reversible condition.
Does cardiac resynchronisation therapy by left bundle branch pacing improve reverse remodelling in patients with LBBB-associated cardiomyopathy?
Does cardiac resynchronisation therapy by left bundle branch pacing improve reverse remodelling in patients with LBBB-associated cardiomyopathy?
LBBB-associated cardiomyopathy is a potentially reversible condition where conduction system pacing (left bundle branch pacing) can lead to significant reverse remodeling, potentially challenging the guideline recommendation to wait 3 months on medical therapy before CRT.
May support earlier conduction system pacing in LBBB cardiomyopathy; leaves open confirmation by randomized trials before practice change.
Left bundle branch block (LBBB) is frequently associated with structural heart disease, and predicts higher rates of morbidity and mortality. In patients with cardiomyopathy (ejection fraction <35%) and LBBB, current guidelines recommend cardiac resynchronisation therapy (CRT) after 3 months of medical therapy. However, studies have suggested that medical therapy alone would be less effective, and the majority of patients would still need CRT at the end of 3 months. Conversely, CRT trials have shown better results and favourable clinical outcomes in patients with LBBB. In the absence of any other known aetiology, LBBB-associated cardiomyopathy represents a potentially reversible form of cardiomyopathy, with the majority of the patients having reverse remodelling after CRT by left bundle branch pacing. This review provides the mechanism, published evidence and role of conduction system pacing for patients with LBBB-associated cardiomyopathy.
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Ponnusamy et al. (2024) conducted a review in Left bundle branch block-associated cardiomyopathy. Conduction system pacing (Left bundle branch pacing) vs. Biventricular pacing was evaluated. Left bundle branch block-associated cardiomyopathy represents a potentially reversible condition where conduction system pacing offers superior electromechanical resynchronization compared to biventricular pacing.
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