Inclusion Criteria:  acute type Aortic dissection;  Exclusion Criteria:  Iatrogenic aortic dissection OR traumatic aortic dissection Patients with hematological diseases, infectious diseases, malignant tumors, immune system diseases, or severe liver diseases. Preoperative use of mechanical ventilation, blood transfusion, renal replacement therapy, extracorporeal membrane oxygenation, or intra-aortic balloon pump during the current admission.