Abstract:

Objective　The study is to provide data support for the production and improvement of artificial blood vessels and to provide reference for aortic endovascular treatment by determining the dimension of the brachiocephalic vessels in the setting of type A aortic dissection. 　Methods　331 cases with type A aortic dissection were reviewed by CTA, and the shape, diameter and angle were studied.　Results　In a total of 331 cases, 91.5%(303 cases) are with a normal aortic arch and 8.5%(28 cases) with a variant aortic arch. In 25.4%(77 cases), the opening of the three branches is lower than that of the aortic arch. In the distribution of the three branches, IA is more common in the posterior position, while LCCA and LSA are more common in the middle. IA is most likely to be involved in the dissection. From IA to LSA, the diameter of the three branches at the opening is (16.2±3.6), (11.0±3.3), and (12.9±3.6)mm respectively. The diameter of the three branches 2 cm distal to the opening is (12.0±3.0), (9.0±1.9), and (9.8± 2.1) mm, respectively. The average IA-LCCA distance is (10.1±5.5)mm(2~20 mm). The average LCCA-LSA distance is (14.1±5.9)mm(2~27 mm). In the coronal plane of aortic arch, the angles of the brachiocephalic artery and the aortic arch are (62.5± 26.5)°, (57.8±23.4)°, and (64.9±23.5)°, respectively. In the aortic cross section, the angles of the brachiocephalic artery and the aortic arch are (121.1±24.7)°, (107.3±19.4)°, and (100.5±16.1)°, respectively.　Conclusion　This research obtained the detailed anatomical data of brachiocephalic vessels in the setting of type A dissection, which is not consistent with the existing artificial blood vessel. The study can provide data support for the further improvement of artificial blood vessels.

Key words: Morphology of aortic arch, Aortic arch dissection, Anatomy