PMC9833361_01
(a) Angiography showed an occluded left subclavian vein. (b) Fluoroscopic image with contrast injection to show the TVA and the position of LBBP (oval area) in RAO30 . (c) Location and shape of the pacing lead after screwing. (d) The depth of the lead in the interventricular septum was revealed by the contrast at LAO45 , and was about 16 mm. (e) The John Jiang's connecting cable with a connected lead.
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Angiography showed that the LSV was occluded (Figure 1a). TVA was performed to ascertain the final position of LBBP (Figure 1b). The John Jiang's connecting cable that can monitor ECG and intracardiac EGM in real time from the pacing lead (Model 3830 69 cm; Medtronic Inc.) was connected to the electrophysiological multichannel recorder system (Shen, Jiang, Cai, et al., ; Shen, Jiang, Jiang, et al., ; Figure 1e). Compared with the traditional connecting cable, the John Jiang's connecting cable has an additional connecting channel. Finally, sheath angiography in the left anterior oblique (LAO) 45  view was performed to show that the depth of the LBBP lead was about 16 mm (Figure 1d), and then, the subsequent implantation processes were completed.