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Schematic representation of left bundle branch pacing (LBBP) with anodal capture. Nonselective LBBP (nsLBBP) results in narrowing of native right bundle branch block (RBBB) from early left ventricular septal activation and anodal capture with simultaneous right ventricular septal activation. HB = His bundle; LAF = left anterior fascicle; LB = left bundle; LBB = left bundle branch; LPF = left posterior fascicle; RA =right atrium; RBB = right bundle branch.
