Abstract：
Central venous obstruction following pacemaker implantation is not uncommon and can prove challenging in the case of a system upgrade to a cardiac resynchronization therapy pacemaker (CRT-P). We describe the case of a patient who underwent a successful upgrading procedure of a pacemaker to a CRT-P in the presence of an occluded left subclavian vein and superior vena cava, using collateral veins that drained into right atrium.
摘要：
起搏器植入后的中心静脉阻塞并不少见，在系统升级为心脏再同步治疗起搏器（CRT-P）的情况下，这可能具有挑战性。我们描述了在存在闭塞的左锁骨下静脉和上腔静脉的情况下，成功将起搏器升级为CRT-P的患者的情况。使用引流到右心房的侧支静脉。
