Skip Navigation LinksHome > December 2014 - Volume 77 - Issue 6 > Hyperfibrinolysis, physiologic fibrinolysis, and fibrinolysi...
Journal of Trauma and Acute Care Surgery:
doi: 10.1097/TA.0000000000000341
WTA 2014 Plenary Papers

Hyperfibrinolysis, physiologic fibrinolysis, and fibrinolysis shutdown: The spectrum of postinjury fibrinolysis and relevance to antifibrinolytic therapy

Moore, Hunter B. MD; Moore, Ernest E. MD; Gonzalez, Eduardo MD; Chapman, Michael P. MD; Chin, Theresa L. MD; Silliman, Christopher C. MD, PhD; Banerjee, Anirban PhD; Sauaia, Angela MD, PhD

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Abstract

BACKGROUND

Fibrinolysis is a physiologic process maintaining patency of the microvasculature. Maladaptive overactivation of this essential function (hyperfibrinolysis) is proposed as a pathologic mechanism of trauma-induced coagulopathy. Conversely, the shutdown of fibrinolysis has also been observed as a pathologic phenomenon. We hypothesize that there is a level of fibrinolysis between these two extremes that have a survival benefit for the severely injured patients.

METHODS

Thrombelastography and clinical data were prospectively collected on trauma patients admitted to our Level I trauma center from 2010 to 2013. Patients with an Injury Severity Score (ISS) of 15 or greater were evaluated. The percentage of fibrinolysis at 30 minutes by thrombelastography was used to stratify three groups as follows: hyperfibrinolysis (≥3%), physiologic (0.081–2.9%), and shutdown (0–0.08%). The threshold for hyperfibrinolysis was based on existing literature. The remaining groups were established on a cutoff of 0.8%, determined by the highest point of specificity and sensitivity for mortality on a receiver operating characteristic curve.

RESULTS

One hundred eighty patients were included in the study. The median age was 42 years (interquartile range [IQR], 28–55 years), 70% were male, and 21% had penetrating injuries. The median ISS was 29 (IQR, 22–36), and the median base deficit was 9 mEq/L (IQR, 6–13 mEq/L). Distribution of fibrinolysis was as follows: shutdown, 64% (115 of 180); physiologic, 18% (32 of 180); and hyperfibrinolysis, 18% (33 of 180). Mortality rates were lower for the physiologic group (3%) compared with the hyperfibrinolysis (44%) and shutdown (17%) groups (p = 0.001).

CONCLUSION

We have identified a U-shaped distribution of death related to the fibrinolysis system in response to major trauma, with a nadir in mortality, with level of fibrinolysis after 30 minutes between 0.81% and 2.9%. Exogenous inhibition of the fibrinolysis system in severely injured patients requires careful selection, as it may have an adverse affect on survival.

LEVEL OF EVIDENCE

Prognostic study, level III.

Copyright © 2014 by Lippincott Williams & Wilkins

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