Utilizing Single-Branched Stent in Combination With Fenestration or Chimney for Endovascular Repair of Aortic Arch Lesions With Aberrant Subclavian Artery

Objective: The study was to figure out the feasibility, efficacy, and safety of a single-branched stent graft, namely Castor, in combination with fenestration or chimney in the context of aortic arch lesions presenting with aberrant subclavian artery (ASA) and/or Kommerell's diverticulum (KD). Methods: All consecutive patients with aortic arch lesions and ASA and/or KD receiving Castor from June 2018 to June 2023 were investigated. Results: Incorporating 18 patients, the study encompassed 11 cases with KD, 3 cases with dysphagia; 2 cases of right-sided aortic arch with left-sided aberrant left subclavian artery (ALSA), and 16 cases of left-sided aortic arch with right-sided aberrant right subclavian artery (ARSA). The mean operation time was 132 +/- 23 minutes. The mean measured proximal aortic diameter was 30.9 +/- 1.6 mm, and proximal diameter of Castor stent was 34 (32, 34.5) mm, with oversize of 9.1 +/- 1.6%; the mean measured branch diameter was 8.8 +/- 0.97 mm, and branch diameter of Castor stent was 10 (8, 10) mm, with oversize of 0.86 +/- 0.57 mm. Technical success rate was 100%, and no in-hospital mortality, no stroke, and no endoleak were identified. One (5.6%) case with spinal cord ischemia and one (5.6%) case with poor healing of operative site were identified. During the follow-up period, no aortic-related death or secondary intervention was recorded. The maximal aortic diameter was significantly reduced at the sixth postoperative month (p(adj)=0.031); KD diameter was significantly reduced at the third (p(adj)=0.001) and sixth (p(adj)<0.001) postoperative month. Conclusion: Totally endovascular repair of aortic arch lesions with ASA and KD via Castor stent in combination with fenestration or chimney is feasible, effective, and safe, which can achieve an encouraging medium-term outcome and provide excellent remodeling at the lesions.