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Variation in LBB anatomy. I: LSF originates from the main LBB; II: LSF originates from the LAF; III: LSF originates from the LPF; IV: LSF originates concomitantly from the LAF and LPF; V: LSF is a “fan‐like interconnecting network.” LAF, left anterior fascicle; LBB, left bundle branch; LPF, left posterior fascicle; LSF, left septal fascicle
