Outcomes After Acute Type A Aortic Dissection in Patients With Prior Cardiac Surgery.

Background: Limited prior studies suggest patients with acute type A aortic dissection (ATAAD) and prior cardiac surgery are at increased risk for major complications compared with those without a prior sternotomy. We sought to investigate the impact of prior cardiac surgery on ATAAD outcomes across a multicenter regional consortium.
Methods: Patients undergoing surgical intervention for ATAAD in a regional Society of Thoracic Surgeons database between 2002 and 2017 were stratified by prior cardiac surgery (reoperative) status. Demographics, operative characteristics, outcomes and cost data were compared by univariate analysis. Multivariable regression models assessed risk-adjusted impact of reoperative status on outcomes.
Results: A total of 1,332 patients underwent surgery for ATAAD, of whom 138 (10.4%) were reoperations. Reoperative patients were older (63 vs. 58 years, p < 0.01) with more comorbidities. These patients had longer median cardiopulmonary bypass times (218 vs 177 minutes, p < 0.01) and increased blood product utilization; however rates of aortic arch, root, and valve procedures were similar. On unadjusted analysis operative mortality was higher in reoperative patients (28% vs 15%, p < 0.01) with a longer total length of stay (13 vs 10 days, p = 0.02). Reoperative patients exhibited a trend toward decreased mortality at high-volume centers (25.7% vs 37.9%, p = 0.19). After risk adjustment reoperative status remained associated with mortality (odds ratio, 2.1; p < 0.01) as well as composite morbidity-mortality (odds ratio, 2.2; p < 0.01).
Conclusions: In this multicenter cohort undergoing repair of ATAAD prior cardiac surgery was associated with an increased morbidity and mortality. Centralization to high-volume centers and emerging technologies may improve outcomes in this high-risk population.
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