D-dimer corrected for thrombin and plasmin generation is a strong predictor of mortality in patients with sepsis

Background. D-dimer (DD) is the most used fibrin-related marker and has been proposed, alone or in combination with other variables, as prognostic factor in patients with sepsis. However, DD generation depends on both coagulation and fibrinolysis, meaning that it may give false negative results in conditions associated with marked fibrinolytic inhibition such as sepsis. In this study we tested whether correction of DD for thrombin and plasmin generation could improve its prognostic significance in septic patients. Patients and Methods. We performed a nested study in 269 septic patients from ALBIOS trial. DD, prothrombin fragment 1+2 (F1+2) and plasmin-antiplasmin complex (PAP) were assayed at day 1. Corrected DD (DDcorr) was calculated by the formula DD*PAP/F1+2, such that the lower the DDcorr the greater the imbalance in favour of fibrin formation over fibrin lysis, and vice-versa. Primary outcome was 90-day mortality. Results. DDcorr showed a J-shaped relationship with mortality, which was highest in the first DDcorr tertile (low fibrinolysis), intermediate in the 3rd (high fibrinolysis) and lowest in the 2nd (balanced fibrinolysis), suggesting an increased risk whenever the coagulation-fibrinolysis balance is tilted (P<0.0001). Neither DD, nor PAP or F1+2 showed a comparable association with mortality. DDcorr was an independent prognostic factor in multivariable Cox models and significantly improved risk stratification (cNRI≥0.28). Finally, by combining DDcorr and SOFA tertiles, we developed a score with high discriminatory power. Discussion. DDcorr is a good marker of the in vivo coagulation-fibrinolysis balance and displays a prognostic value in sepsis much higher than DD.