180 Early Deep Vein Thrombosis Chemoprophylaxis in Traumatic Brain Injury.

INTRODUCTION: Venous thromboembolism (VTE) is a common complication of traumatic brain injury (TBI) with an estimated incidence of 25% when chemoprophylaxis is delayed. The timing of initiating prophylaxis is controversial given the concern for hemorrhage expansion. The objective of this study was to determine the safety of initiating VTE chemoprophylaxis in patients with TBI within 24 hours of presentation.

METHODS: We performed a retrospective analysis of a prospectively maintained database for all patients with traumatic intracranial hemorrhage presenting to a level I trauma center between July 2011 and September 2013. Patients receiving early chemoprophylaxis (<24 hours) were compared with the matched cohort of patients who received heparin in a delayed fashion (>48 hours). The primary outcome of the study was radiographic expansion of the intracranial hemorrhage. Secondary outcomes included VTE, use of intracranial pressure monitoring, delayed decompressive surgery for refractory elevated intracranial pressure, and all-cause mortality.

RESULTS: Of the 282 patients in our study, 94 (33%) received chemoprophylaxis within 24 hours of admission. The cohorts were evenly matched across all variables. The primary outcome occurred in 18% of patients in the early cohort compared with 17% in the delayed cohort (P = .83). Fifteen patients (16%) in the early cohort underwent an invasive procedure in a delayed fashion. This compares to 35 patients (19%) in the delayed cohort (P = .38). Five patients (1.7%) in our study had a VTE event (ie, deep vein thrombosis or pulmonary embolism) during their hospitalization. Two of these patients received early chemoprophylaxis (P = .75). The rate of mortality from all causes was similar in both groups (4.1% vs 3.7%, P = .83).

CONCLUSION: Early (<24 hours) initiation of VTE chemoprophylaxis in patients with traumatic intracranial hemorrhage appears to be safe. Further prospective studies are needed to validate this finding.