Successful upgrade to cardiac resynchronization therapy for cardiac implantation-associated left subclavian vein occlusion: A case report.

Background: Subclavian vein stenosis or occlusion may be caused by a transvenous pacemaker, which makes the reimplantation of a new pacemaker lead difficult. Transvenous pacemaker lead implantation-related subclavian vein occlusion may present difficulty with regard to cardiac resynchronization therapy (CRT) upgrade.

Case Summary: We report the case of a 46-year-old man who was admitted with total subclavian vein occlusion caused by a permanent pacemaker that had been implanted 2 years previously.