Factor VIIa-AT Complex Is an Independent Prognostic Marker of Disseminated Intravascular Coagulation.

Objective: The factor VIIa-Antithrombin (VIIa-AT) complex is a relatively new biomarker associated with the activation of the extrinsic coagulation pathway. Since disseminated intravascular coagulation (DIC) is primarily driven by issue factor (TF)-induced extrinsic coagulation activation, the plasma level of factor VIIa-AT, via its role as an activation marker of the extrinsic pathway, could be a potential marker for DIC. The clinical significance of extrinsic coagulation markers, including factor VIIa-AT, in DIC was investigated.

Methods: The extrinsic coagulation markers, including factor VIIa-AT, TF, factor VII, and antithrombin (AT), were measured in 148 patients clinically suspicious for DIC. Multiple linear regression and Cox proportional-hazard analysis were conducted to evaluate both contributing factors and the prognostic power of the markers.

Results: The factor VIIa-AT complex, factor VII, and AT levels were significantly lower in the overt-DIC group and gradually decreased according to the severity of DIC based on the DIC scores. On the contrary, TF was significantly higher in the overt-DIC group. The factor VII level was revealed as a significant independent contributor to the factor VIIa-AT level. Upon multivariable Cox proportional-hazard analysis, the factor VIIa-AT complex showed the highest hazard ratio (3.41; 95% confidence interval 1.11-10.44).

Conclusion: The factor VIIa-AT complex reflects the severity of DIC and is an independent prognostic factor of DIC. Our findings hint at the potential of the factor VIIa-AT complex to be used as a complementary marker to well-established biomarkers such as AT.