The goal of this observational study is to develop and validate a predictive model for prolonged mechanical ventilation (PMV) following acute type A aortic dissection (ATAAD) surgery.

The main questions it aims to answer are:

1. To validate the predictive performance of the model for PMV after ATAAD surgery
2. To assess the proportion of PMV among patients undergoing ATAAD surgery
3. To evaluate the ICU length of stay and operative mortality in patients with PMV following ATAAD surgery

Inclusion Criteria:

• Age ≥18 years;
• Diagnosis of acute type A aortic dissection (ATAAD) confirmed by computed tomography angiography and echocardiography;
• Patients who underwent aortic surgery requiring cardiopulmonary bypass (CPB), were admitted to the surgical intensive care unit (SICU), and received mechanical ventilation.

Exclusion Criteria:

• Reintubation;
• Intraoperative death or failure to survive beyond 72 hours postoperatively;
• Pregnancy;
• Severe comorbidities (e.g., lung cancer);
• Missing critical outcome data (e.g., short-term mortality, mechanical ventilation duration, reintubation).

ATAAD postoperative patients admitted to SICU