Perioperative and long-term outcomes after thoracoabdominal aortic aneurysm repair of chronic dissection etiology

Objective: Open repair of thoracoabdominal aortic aneurysms (TAAAs) that have developed secondary to chronic dissection (CD) is often more complex than repair of degenerative aneurysms (DAs). However, the literature is conflicted regarding the effect of CD on perioperative and long-term outcomes after open TAAA repair. The goal of this study was to determine whether CD predicts negative outcomes after TAAA repair. Methods: All open type Ito type III TAAA repairs performed from 1987 to 2015 were evaluated using a single institutional database. End points included in-hospital death, spinal cord ischemia (SCI), major adverse events (MAEs), and long-term survival. Repairs performed for rupture or acute dissection were excluded. Univariate analysis was conducted using the Fisher's exact test for categorical variables and the Wilcoxon rank sum test for continuous variables. Logistic multivariable regression was used for the in-hospital end points, and survival analyses were performed with Cox proportional hazards modeling and Kaplan-Meier techniques. Results: During the study period, 453 patients underwent an intact open type I to type III TAAA repair. Ninety (20%) were performed for patients with CD. Those with CD were more likely to be younger (59 years vs 72 years; P < .001), to have an extent II lesion (30% vs 16%; P < .001), and to have Marfan syndrome (18% vs 0.6%; P < .001) and less likely to have coronary artery disease (28% vs 25%; P = .01) or chronic obstructive pulmonary disease (12% vs 27%; P = .004) compared with patients with DA. Twelve percent of patients with CD died perioperatively compared with 6% of those with DA (P = .03). Eighteen percent of CD patients suffered from SCI compared with 12% of DA patients (P = .2). Fifty-nine CD patients suffered a MAE compared with 42% of those with DA (P = .006). Multivariable analysis revealed CD to be an independent predictor of perioperative death (adjusted odds ratio [AOR], 3.1; 95% confidence interval [CI], 1.2-8.0; P = .02) with adjustment for age and Crawford extent. CD was also found to be independently predictive of any MAE (AOR, 2.5; 95% CI, 1.4-4.6; P = .002). CD was not associated with increased risk of SCI (AOR, 1.4; 95% CI, 0.6-3.2; P = .4). There was a long-term survival advantage in the CD cohort in the unadjusted analysis (log-rank, P = .009) but not in the adjusted analysis (CD adjusted hazard ratio, 0.9; 95% CI, 0.6-1.4; P = .7). Conclusions: When analysis is limited to type I to type III TAAAs, open repair of patients with CD leads to increased perioperative mortality and morbidity compared with patients with DA. However, age-adjusted long-term survival is no different between the two cohorts.