Ultra-high-frequency ECG quantifies divergent electrical phenotypes after left bundle branch area pacing: Resynchronization in baseline LBBB versus preservation of synchrony in baseline narrow QRS (two-case series).

Abstract excerpt

BACKGROUND: Left bundle branch area pacing (LBBAP) is increasingly used to achieve physiologic ventricular activation. However, electrical "success" may differ by baseline substrate: resynchronization in left bundle branch block (LBBB) versus preservation of synchrony in intrinsically narrow QRS. Ultra-high-frequency ECG (UHF-ECG) provides quantitative indices of ventricular activation timing and dispersion...

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