Key result
Left-sided EPS shows LBBB is mostly proximal, predicting successful QRS correction with HBP.
Why the study?
The conventional determination of LBBB pattern by surface ECG may include patients with and without conduction block, and the underlying pathophysiology of LBBB in CRT candidates requires clarification.
Observational
Left-sided electrophysiology studies reveal that LBBB is often due to proximal block in the His bundle, identifying patients most likely to benefit from His bundle pacing for resynchronization.
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May guide His bundle pacing candidate selection in LBBB; leaves open need for randomized confirmation.
Roderick H. Tung (2020) conducted an observational in Left bundle branch block (LBBB) in the context of cardiac resynchronisation therapy. Left-sided electrophysiology study (EPS) and His bundle pacing (HBP) was evaluated. Left-sided electrophysiology studies demonstrated that conduction block associated with the LBBB pattern is most often proximal, predicting QRS correction with His bundle pacing.
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