Abstract
PURPOSE: Rapid risk stratification is crucial in patients with acute type A aortic dissection (ATAAD), particularly those presenting with circulatory collapse or malperfusion. This study investigated whether preoperative blood lactate levels could predict surgical outcomes. METHODS: A retrospective analysis was conducted on 166 patients who underwent emergency surgery for ATAAD between 2014 and 2022. Preoperative arterial lactate levels were measured at admission. Multivariate logistic regression identified risk factors for in-hospital mortality. The optimal lactate cutoff value was determined using receiver-operating characteristic curve analysis. Correlation with the Penn classification was also assessed. RESULTS: In-hospital mortality was 4.2%. A lactate level ≥3.7 mmol/L was independently associated with in-hospital mortality (hazard ratio, 1.41, p = 0.026) and was strongly correlated with Penn classes Ac and Abc. Patients with elevated lactate levels had more severe clinical presentations, prolonged intensive care unit stays, and more postoperative complications. Long-term mortality was also significantly higher in the high-lactate group (p = 0.013). CONCLUSIONS: A preoperative lactate level ≥3.7 mmol/L is a practical and effective point-of-care predictor of surgical outcomes in ATAAD. It reflects circulatory collapse and severe malperfusion, and may assist nonspecialist clinicians in early triage and decision-making.