Intermittent capture of the left bundle with permanent his bundle pacing: Mechanistic insights and implications for an emerging field

摘要

We present a case of a patient with elevated His lead capture thresholds and intermittent recruitment of the left bundle. The patient underwent a non-invasive electrophysiology study and was determined to have a left bundle branch block due to post-repolarization refractoriness. The nature of bundle branch block can have important implications for optimal patient selection and device programming in the emerging field of His bundle pacing.