Initial results of thoracic endovascular repair for uncomplicated type B aortic dissection involving the arch vessels using a semicustom-made thoracic fenestrated stent graft

Abstract

ObjectiveThoracic endovascular aortic repair (TEVAR) for selected type B aortic dissection (TBAD) is a standard treatment; however, TBAD involving the aortic arch is difficult to treat because of the need for arch vessel reconstruction. We report our initial results of TEVAR for uncomplicated TBAD involving the arch vessels using a semicustom-made fenestrated stent graft. MethodsThis is a retrospective study of 24 patients treated by fenestrated (F group) or debranching (D group) TEVAR from August 2011 to July 2017. The patients in the F group received the Najuta semicustom-made fenestrated stent graft (Kawasumi Laboratories, Tokyo, Japan). The fenestrated graft ensures sufficient sealing at the proximal healthy aorta without the need for arch vessel reconstruction. The primary end point was aorta-related mortality; the secondary end points were technical success and major adverse events (stroke, type IA endoleak, retrograde type A aortic dissection, and secondary intervention). ResultsDuring the study period, we treated 65 TBAD cases by TEVAR, including 17 complicated cases. Of the 48 uncomplicated cases, 24 underwent TEVAR with arch vessel involvement (13 in the F group and 11 in the D group). The technical success rates in the F and D groups were 92.3% and 100.0%, respectively (P > .99, NS). The mean operation time was significantly shorter in the F group (158 minutes) than in the D group (202 minutes; P = .0426), and the mean postoperative hospital stay was also significantly shorter in the F group (7 days) than in the D group (22 days; P = .0168). The primary patency rate of the reconstructed branch vessel was 100%, and there were no aorta-related deaths or retrograde type A aortic dissection in either group. One patient had a type IA endoleak in the F group. In the D group, one patient had a postoperative stroke and two patients required secondary interventions for stent graft-induced new entry at the descending aorta. The median follow-up period was 14.1 months (range, 1-37 months). The rate of freedom from aorta-related death was 100% in both groups (P > .99, NS); the rate of freedom from major adverse events at 24 months was 92.3% in the F group and 72.7% in the D group (P = .749, NS). ConclusionsThe initial results of TEVAR with aortic arch vessel reconstruction for uncomplicated TBAD were acceptable. The fenestrated graft may be a less invasive option for the treatment of TBAD involving the aortic arch.