EAST MCT: COMPARISON OF PRE-INJURY ANTITHROMBOTIC USE AND REVERSAL STRATEGIES AMONG SEVERE TBI PATIENTS.

BACKGROUND Trauma teams are often faced with patients on antithrombotic drugs, which is challenging when bleeding occurs. We sought to compare the effects of different antithrombotic medications on head injury severity and hypothesized that antithrombotic reversal would not improve mortality in severe TBI patients. METHODS An EAST-sponsored prospective, multi-centered, observational study of 15 trauma centers was performed. Patient demographics, injury burden, comorbidities, antithrombotic agents, and reversal attempts were collected. Outcomes of interest were head injury severity and in-hospital mortality. RESULTS Analysis was performed on 2793 patients. The majority of patients were on aspirin (ASA, 46.1%). Patients on a platelet chemoreceptor blocker (P2Y12) had the highest mean injury severity score (ISS, 9.1 ± 8.1). Patients taking P2Y12 inhibitors ± ASA, and ASA + warfarin had the highest head AIS mean (1.2 ± 1.6). On risk adjusted analysis, warfarin + ASA was associated with a higher head AIS (OR 2.43; 95% CI: 1.34-4.42) after controlling for injury severity score (ISS), Charlson Comorbidity Index (CCI), initial Glasgow Coma Score (I-GCS) and initial systolic blood pressure (I-SBP). Among patients with severe TBI (head AIS > 3) on antiplatelet therapy, reversal with desmopressin (DDAVP) and/or platelet transfusion did not improve survival (82.9% reversal vs 90.4% none, p = 0.30). In severe TBI patients taking Xa inhibitors who received prothrombin complex concentrate (PCC), survival was not improved (84.6% reversal vs 84.6% none, p = 0.68). With risk adjustment as described previously, mortality was not improved with reversal attempts (antiplatelet agents OR 0.83. 85% CI: 0.12-5.9, p = 0.85, Xa inhibitors OR 0.76, 95% CI: 0.12-4.64, p = 0.77). CONCLUSIONS Reversal attempts appear to confer no mortality benefit in severe TBI patients on antiplatelet agents or Xa inhibitors. Combination therapy was associated with severity of head injury among patients taking preinjury antithrombotic therapy, with ASA + warfarin possessing the greatest risk. LEVEL OF EVIDENCE Level II; prognostic. STUDY TYPE prospective observation.