Guideline Versus Reality: National EMS Data Reveal Diagnostic Timing Gaps in Mild Traumatic Brain Injury

Background: Current mild traumatic brain injury (mTBI) guidelines often reference rigid prehospital time benchmarks—most notably the 8-minute response threshold—as critical to preserving neurological outcome. However, growing evidence suggests that treatment quality and total care interval may be more predictive of outcome than strict time limits alone. This has significant implications for EMS triage algorithms and regional system performance metrics. Methods: We conducted a structured review of major prehospital TBI studies examining the association between time intervals and patient outcomes, with particular attention to dispatch-to-scene time, scene time, and transport duration. In parallel, we analyzed Emergency Medical Services (EMS) response data from the 2023 National Emergency Medical Services Information System (NEMSIS), organized by U.S. Census Division, to assess real-world interval distributions in mTBI-relevant dispatches. Results: Literature review revealed inconsistent associations between time thresholds and outcomes, with several studies reporting improved survival or neurological status despite longer scene times. In contrast, other cohorts found advantages associated with ultra-rapid dispatch and transport. NEMSIS data showed that EMS response intervals often exceed traditional diagnostic windows. These prolonged intervals did not consistently correlate with worsened outcomes across regions. Conclusion: Prehospital care quality, rather than strict adherence to an 8-minute benchmark, appears to better predict outcome in mTBI. Our findings support a shift in triage and EMS quality measures toward flexibility, emphasizing treatment content over arbitrary timing thresholds.