In Situ Laser Stent Graft Fenestration of the Left Subclavian Artery During Thoracic Endovascular Repair of Type B Aortic Dissection with Limited Proximal Landing Zones: 5-Year Outcomes.

Purpose: To assess safety and feasibility of in situ laser stent graft fenestration to revascularize the left subclavian artery (LSA) during thoracic endovascular repair (TEVAR) of type B aortic dissection (TBAD) with limited proximal landing zones with 5 years of follow-up. Materials and Methods: In a single-center retrospective study, 130 patients with TBAD with limited proximal landing zones (<= 1.5 cm) underwent in situ laser stent graft fenestration revascularizing the LSA during TEVAR from April 2014 to April 2019. Outcomes were assessed by CT angiography and clinic visits, including technical success rate, operative time, LSA patency, ischemic events, and late aorta-related complications during follow-up. Results: Mean age of patients was 53 y (range, 33-73 y). Primary technical success rate watt 96.9% (12030). Three chimney stents were placed instead of fenestration, and 1 LSA fenestration was combined with a left common carotid arteiy (LCCA) chimney stent. Mean operative time was 53 min +/- 28 with fluoroscopy time of 40 min +/- 15. There were no neurologic complications and no deaths, with a mean duration of hospital stay of 9 d (range, 5-21 d). At a mean follow-up of 42 mo (range, 5-60 mo), there was a 97% primary LSA patency. Four patients had a type I endoleak, which disappeared during follow-up. One LCCA became occluded after 6 months. No type II or III endoleaks were found. Retrograde type A aortic dissection and stent graft-induced new distal entry were not found during follow-up. Conclusions: In situ user fenestration to revascularize the LSA during TEVAR of TBAD with limited proximal landing zones was efficient, safe, and feasible based on 5-year follow-up.