Midterm outcomes of thoracic endovascular repair for uncomplicated type B aortic dissection with double-barrel type

Objective The midterm outcomes and aortic remodeling after thoracic endovascular aortic repair (TEVAR) for uncomplicated type B aortic dissection (TBAD) were evaluated. Methods Forty-seven patients (mean age 66 +/- 12 years) who underwent TEVAR for uncomplicated TBAD with double-barrel type from January 2012 to December 2017 were retrospectively analyzed. The indication for TEVAR for entry closure was a maximum aortic diameter > 40 mm with a patent false lumen. Twenty-six patients (55.3%) had TEVAR in chronic phase, over 6 months after the onset of aortic dissection. Results There was no hospital death or serious complication. During follow-up (mean 35 +/- 16 months), overall 3-year survival was 95.6 +/- 3.1%. A significant trend was observed with a higher rate of shrinkage of overall aortic diameter, expansion of the true lumen, and shrinkage of the false lumen more proximally from the stent graft-covered site. Rate of aortic shrinkage in chronic with aortic diameter more than 50 mm was lower compared with the other (proximal: 33.3% vs. 80-100%, distal 0-16.7% vs. 50-52.9%). Rate of aortic dilation distally to the stent graft-covered site was 28% in chronic compared with 5% in non-chronic. Adverse events were mainly due to distal aortic dilation, and 3-year freedom from all adverse events was 79.8 +/- 6.5%. Conclusions Favorable aortic remodeling of the proximal stent graft-covered site could be expected even in the chronic phase if preoperative aortic dilation over 50 mm is unaccompanied. Careful follow-up focusing on dilation of the distal aortic segment is mandatory especially in patients who underwent TEVAR in chronic phase.