BACKGROUND The modified Brain Injury Guidelines (mBIG) are an algorithm for treating patients with traumatic brain injury and intracranial hemorrhage by which selected patients do not require a repeat head computed tomography, a neurosurgery consult, or even an admission. The mBIG refined the original Brain Injury Guidelines (BIG) to improve safety and reproducibility. The purpose of this study is to assess safety and resource utilization with mBIG implementation. METHODS The mBIG were implemented at three Level I trauma centers in August 2017. A multicenter retrospective review of prospectively collected data was performed on adult mBIG 1 and 2 patients. The post-mBIG implementation period (August 2017 to February 2021) was compared with a previous BIG retrospective evaluation (January 2014 to December 2016). RESULTS There were 764 patients in the two study periods. No differences were identified in demographics, Injury Severity Score, or admission Glasgow Coma Scale score. Fewer computed tomography scans (2 [1,2] vs. 2 [2,3], p
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