Durability of open surgical repair of type I-III thoracoabdominal aortic aneurysm.

OBJECTIVE

Early outcomes and late mortality after open repair of extent I to III thoracoabdominal aortic aneurysms (TAAAs) are described, but late graft and aortic events are seldom detailed. This study investigated long-term aortic and graft outcomes as these data are increasingly important as endovascular repair matures.

METHODS

During 28 years, 516 patients underwent repair (type I, n = 177 [34%]; type II, n = 100 [20%]; type III, n = 239 [46%]). Patients were monitored for late events. Late aortic events were defined as native aortic disease leading to death or further intervention. Planned secondary procedures were excluded. Graft complications included anastomotic aneurysm, graft infection, and branch occlusions. Variables were assessed for association with end points using log-rank methods and Cox proportional hazards regression. Time-to-event analysis was performed using Kaplan-Meier methods.

RESULTS

In-hospital death occurred in 40 patients (8%), leaving 476 for surveillance. Mean age was 69.8 ± 10.5 years. Mean follow-up was 4.9 ± 4.6 years. Repair conduct included distal aortic perfusion and motor evoked potential monitoring (n = 169 [35.5%]), clamp and sew (n = 307 [64.5%]), and selectively applied in-line mesenteric shunting (n = 172 [36.1%]). At the time of repair, 117 patients (24.6%) had 122 synchronous, noncontiguous aortic aneurysms. There were 98 late aortic and graft events in 89 patients (18.7%); 62 aortic-related events occurred in 56 patients (12%; elective repair, n = 47; emergent repair, n = 14; type A dissection, n = 1) at a mean of 4.4 ± 4.2 years after repair. Variables independently predictive of an aortic event were aortic clamp time (hazard ratio [HR], 1.02/min; P = .001), type III extent (HR, 2.5; P = .008), and expansion of retained aorta (HR, 10.4; P < .0005). There were 33 patients (7%) who experienced 36 graft-related events (anastomotic aneurysm, n = 14 [3% of cohort; aortic, n = 7; visceral patch, n = 6; side graft, n = 1]; graft infection, n = 12; renovisceral occlusion/repair, n = 9 [1.9%; side-arm graft, n = 8; native, n = 1]; and anastomotic stricture, n = 1) occurring at 4.7 ± 4.5 years. Variables predictive of graft-related complication were type II extent (HR, 3.4; P = .002) and distal aortic perfusion and motor evoked potential monitoring (HR, 3.6; P = .02). Freedom from aortic- or graft-related event was 80% at 5 years. Freedom from any aortic or graft reintervention was 84% at 5 years. Aortic-related mortality after discharge was 2.7% and estimated to be 3.1% at 5 years. Overall survival was 67% and 44% at 5 and 10 years, respectively.

CONCLUSIONS

After type I-III TAAA repair, late aortic and graft-related events occur in 19% of patients. Native aortic disease sequelae are more common than graft complication. Aortic events are predicted by complex operation and degree of remaining aorta. Extensive reconstruction drives graft-related events. Ultimately, reintervention is rare and aorta-related mortality low. These findings verify durability of extensive TAAA repair, serving as benchmarks for endovascular repair.