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Updated: Sep 9, 2025

Author Spotlight: Deciphering Coagulation Disorders in Traumatic Brain Injury Patients
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Tranexamic Acid and Systemic Complement Activation in Traumatic Brain Injury Patients.

Elizabeth R Maginot1, Flobater I Gawargi1, Ernest E Moore2,3

  • 1Division of Acute Care Surgery, Department of Surgery, University of Nebraska Medical Center, Omaha, Nebraska.

Journal of the American College of Surgeons
|August 29, 2025
PubMed
Summary
This summary is machine-generated.

Pre-hospital tranexamic acid (TXA) reduces complement activation in traumatic brain injury (TBI) patients. This suggests TXA

Keywords:
ComplementFibrinolysisInflammationTranexamic AcidTraumatic Brain Injury

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Area of Science:

  • Trauma research
  • Neuroscience
  • Immunology

Background:

  • Traumatic brain injury (TBI) is a significant cause of mortality.
  • Pre-hospital tranexamic acid (TXA) administration shows a mortality benefit in TBI patients.
  • The mechanism behind TXA's mortality benefit is not fully understood, as it doesn't reduce brain bleed size.

Purpose of the Study:

  • To investigate the effect of pre-hospital TXA on complement activation in TBI patients.
  • To explore potential mechanisms of TXA's benefit beyond hemostasis.

Main Methods:

  • A randomized pre-hospital trial involving 40 adult TBI patients receiving either TXA or placebo.
  • Plasma analysis at presentation, 6, and 24 hours for complement activation/regulatory markers, coagulation, and plasmin generation.
  • Utilized complement multiplex assays, ELISA, and clinical laboratory testing.

Main Results:

  • TXA significantly reduced terminal complement complex (sC5b-9) and C5a levels.
  • Factor H, a complement regulator, was preserved in the TXA group.
  • D-dimer levels were significantly lower in the TXA group at 6 hours.

Conclusions:

  • Pre-hospital TXA bolus appears to modulate the complement system in TBI.
  • TXA may exert its beneficial effects through complement inhibition, potentially via a plasmin-mediated pathway.
  • Further research is needed to confirm the plasmin-mediated mechanism and its applicability to different trauma populations.