Laboratory signatures differentiate the tolerance to hypothermic circulatory arrest in acute type A aortic dissection surgery.

Objectives: Our goal was to investigate whether laboratory signatures on admission could be used to identify risk stratification and different tolerance to hypothermic circulatory arrest in acute type A aortic dissection surgery.

Methods: Patients from 10 Chinese hospitals participating in the Additive Anti-inflammatory Action for Aortopathy & Arteriopathy (5A) study were randomly divided into derivation and validation cohorts at a ratio of 7:3 to develop and validate a simple risk score model using preoperative variables associated with in-hospital mortality using multivariable logistic regression. The performance of the model was assessed using the area under the receiver operating characteristic curve. Subgroup analyses were performed to investigate whether the laboratory signature-based risk stratification could differentiate the tolerance to hypothermic circulatory arrest.

Results: There were 1443 patients and 954 patients in the derivation and validation cohorts, respectively. Multivariable analysis showed the associations of older age, larger body mass index, lower platelet-neutrophile ratio, higher lymphocyte-monocyte ratio, higher D-dimer, lower fibrinogen and lower estimated glomerular filtration rate with in-hospital death, incorporated to develop a simple risk model (5A laboratory risk score), with an area under the receiver operating characteristic of 0.736 (95% confidence interval 0.700-0.771) and 0.715 (95% CI 0.681-0.750) in the derivation and validation cohorts, respectively. Patients at low risk were more tolerant to hypothermic circulatory arrest than those at middle to high risk in terms of in-hospital mortality [odds ratio 1.814 (0.222-14.846); odds ratio 1.824 (1.137-2.926) (P = 0.996)].

Conclusions: The 5A laboratory-based risk score model reflecting inflammatory, immune, coagulation and metabolic pathways provided adequate discrimination performances in in-hospital mortality prediction, which contributed to differentiating the tolerance to hypothermic circulatory arrest in acute type A aortic dissection surgery.Clinical Trials. gov number NCT04918108.