Baseline
A total of 48 patients with acute Stanford type A aortic dissection underwent FET surgery. The baseline data and surgical data were shown inTable 1 and Table 2 . The propensity scores(Table 3) were matched according to the age and the FL distal position, the matching ratio was 1:1, and the balance test of length was shown in Table 4 . All patients were divided into two groups, the short FET group, and the long FET group. After propensity score matching, the preoperative data of the two groups were balanced.
Intraoperative data in Table 2 show that the long FET group received bilateral cerebral perfusion (P <0.001), femoral artery perfusion (P <0.001), and moderate-light hypothermic circulatory arrest (P <0.001); the short FET group received unilateral cerebral perfusion (P <0.001), axillary artery perfusion (P =0.046), and deep hypothermic circulatory arrest (P <0.001). In the postoperative patient data (Table 2) , the distal landing zone of the long FET group was Th8-9, and the distal landing zone of the short FET group was Th6-8. No deaths were observed in both groups of patients. There was no significant difference in stroke, SCI, infection, and leakage.