Stent grafting for aneurysmal degeneration of chronic descending thoracic aortic dissections

ObjectiveThe objective of this study was to examine the results of thoracic endovascular aneurysm repair (TEVAR) for chronic descending thoracic aortic (DTA) dissections with aneurysmal degeneration.MethodsOver 70 months at a single institution, 27 patients underwent TEVAR for aneurysms related to chronic (>6 weeks) DTA dissections.ResultsMean patient age was 67.5 ± 9.6 years; 18 were men. Primary indications for repair were aneurysm size (n = 20), rapid aneurysmal growth (n = 5), saccular aneurysm (n = 1), and rupture (n = 1). Preoperative false lumen status was patent in 18 patients, partially thrombosed in 8 patients, and unknown in the patient whose aneurysm ruptured. The proximal entry tear was covered in all 27 patients. Fourteen patients required coverage of the left subclavian artery, of which 9 patients underwent prophylactic revascularization. On completion angiogram, no patient had antegrade perfusion of the aneurysmal false lumen. There were three procedural complications: 2 patients sustained paraparesis (one resolved and one improved), and 1 patient had an access injury requiring stent graft placement. Thirty-day mortality was 3.7% (1 of 27); the one death was in the patient whose aneurysm ruptured. Of the 26 surviving patients, 23 (88.5%) had thrombosis of the aneurysmal false lumen. Twenty-two patients (84.6%) had stability or decrease in maximal aneurysm diameter on last radiographic follow-up at 18 ± 20 months. Three-year Kaplan-Meier survival was 90.3% ± 6.5% in the 26 patients who survived to hospital discharge, with a mean follow-up of 27.3 ± 22.1 months. In patients with preoperatively partially thrombosed false lumens (n = 8), 3-year survival was 100%.ConclusionsTEVAR for aneurysms due to chronic dissections of the DTA can be performed safely and effectively at midterm follow-up according to this single-institution study. Stent graft therapy may be of particular benefit in patients presenting with partially thrombosed false lumens.