Degree of fusiform dilatation of the proximal descending aorta in type B acute aortic dissection can predict late aortic events

Definition of FI. An index that expresses the degree of fusiform dilatation of the proximal descending aorta was defined as follows: A/(B +C). A = Maximum diameter of the descending aorta. B = Diameter of the distal aortic arch. C = Diameter of the descending aorta at the level of the origin of the main pulmonary artery.

FI and late aortic events. A, Comparison of the FI between patients with and without late aortic events: Levels of FI are demonstrated by the box showing the 25th to 75th percentiles containing the median line and the lines showing the 10th to 90th percentiles. B, Kaplan–Meier event-free curves for late aortic events according to quartiles of the FI. Q, Quartile of FI: Q1 (<0.49), Q2 (≤0.49, <0.55), Q3 (≤0.55, <0.64), Q4 (≤0.64).

Kaplan–Meier event-free curves for late aortic events. A, Event-free curves of patients with 1 of the predominant predictors. M: Patients with a maximum aortic diameter of ≥ 40 mm. P: Patients with a patent false lumen. F: Patients with an FI of ≥ 0.64. B, Event-free curves of patients with 2 predominant predictors. MP: Patients with a maximum aortic diameter of ≥ 40 mm and a patent false lumen. MF: Patents with a maximum aortic diameter of ≥ 40 mm and an FI of ≥ 0.64. PF: Patients with a patent false lumen and an FI of ≥ 0.64. C, Event-free curves of patients with all 3 or none of the predominant predictors. N: Patients with none of the 3 predictors. MPF: Patients with all 3 predictors (a maximum aortic diameter of ≥ 40 mm, a patent false lumen, and an FI of ≥ 0.64).

Comparison of the event-free curves between patients with 1 and 2 predictors. A, M: Patients with a maximum aortic diameter of ≥ 40 mm. MF: Patents with a maximum aortic diameter of ≥ 40 mm and an FI of ≥ 0.64. B, P: Patients with a patent false lumen. PF: Patients with a patent false lumen and an FI of ≥ 0.64.