Figure 1. Fluoroscopy during LBB pacing. A: Venous
angiography after puncture showed a tortuous left subclavian vein.B, C: Postprocedural fluoroscopy showed a fixed 3830 lead in
the IVS and atrial lead in right atrial appendage. D, E, F:Lead depth measured by the relative position of 3830 electrode
(white arrow ) and IVS during screwing. D, E : Angiography
via 8.5 F puncture sheath delineated RV silhouette (D ,dashed white line ) while delayed contrast delineated LV
silhouette (E , dashed white line ). F :
Angiography via C315 sheath showed RV side of IVS (dashed white
line ).