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Outcomes following administration of tranexamic acid in military traumatic brain injury

Patrick F Walker, MD, Joseph D Bozzay, MD, Luke R Johnston, MD, Eric A Elster, MD, Carlos J Rodriguez, DO, Matthew J Bradley, MD. Department of Surgery, Uniformed Services University of the Health Sciences and Walter Reed National Military Medical Center, Bethesda, Maryland

OBJECTIVES: Tranexamic acid (TXA) may be a useful adjunct for military patients with severe traumatic brain injury (TBI), who are often treated in austere settings without immediate access to neurosurgical intervention. The purpose of this study was to evaluate any association between TXA use and progression of intracranial hemorrhage (ICH), neurologic outcomes, and venous thromboembolism (VTE) in TBI.

METHODS: This was a retrospective cohort study of 699 consecutive combat casualties from October 1, 2010 to December 31, 2015 who were transferred to a military treatment facility (MTF) in the United States. Data collected included: demographics, types of injuries, initial and interval head computerized tomography (CT) scans, Glasgow Coma Scores (GCS), and six-month Glasgow Outcome Scores (GOS). Results were stratified based on TXA administration.

RESULTS: Of the 687 active duty service members reviewed, 71 patients had ICH (10.3%). Most casualties were injured in a blast (80.3%), with 36 patients (50.7%) sustaining a penetrating TBI. Most patients had a mixed ICH pattern that included: 80.3% with intraparenchymal hemorrhage, 60.6% with subarachnoid hemorrhage, 46.5% with subdural hemorrhage, 25.4% with intraventricular hemorrhage, and 11.3% with epidural hemorrhage. Mean ISS was 28.2±12.3. Nine patients (12.7%) received a massive transfusion within 24 hours of injury, and TXA was administered to 14 (19.7%) casualties. Patients that received TXA had lower initial reported GCS (9.2±4.4 vs. 12.5±3.4, p=0.003), similar discharge GCS (13.3±4.0 vs. 13.8±3.2, p=0.62 and a larger improvement between initial and discharge GCS (3.7±3.9 vs. 1.3±3.1, p=0.02). However, there was no difference in mortality (7.1% vs. 7.0%, p=0.99), progression of ICH (35.7% vs. 10.5%, p=0.91), frequency of craniotomy (50.0% vs. 40.4%, p=0.56), or mean GOS (3.5 vs. 3.8, p=0.29). Patients administered TXA had a higher rate of VTE (35.7% vs. 7.0%, p=0.01). On multivariate analysis, however, TXA was not independently associated with VTE.

CONCLUSION: Patients that received TXA were associated with an improvement in GCS but not in progression of ICH or GOS. TXA was not independently associated with VTE, although this may be related to a paucity of patients receiving TXA. Decisions about TXA administration in combat casualties with ICH should be considered in the context of the availability of neurosurgical intervention as well as severity of extracranial injuries and need for massive transfusion.


Presented at the SAGES 2017 Annual Meeting in Houston, TX.

Abstract ID: 88132

Program Number: MSS11

Presentation Session: Full-Day Military Surgical Symposium – Trauma/Critical Care Presentations

Presentation Type: MSSPodium

36

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