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Pre- and post-implant ECGs. Top panel: sinus rhythm, first degree block, PR 210 ms. RBBB with LPFB. QRS duration 153 ms. Right axis deviation. Lower panel: RV septal pacing fused with intrinsic conduction via the left anterior fascicle. QRS duration 110 ms here. Note right axis deviation due to the combined conduction via the anterior fascicle (right, inferior axis) plus RVOT pacing (inferior axis).
