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BACKGROUND Patients' trauma burdens are a combination of anatomic damage, physiologic derangement, and the resultant depletion of reserve. Typically, Injury Severity Score (ISS) >15 defines major anatomic injury and Revised Trauma Score (RTS) <7.84 defines major physiologic derangement, but there is no standard definition for reserve. The Need For Trauma Intervention (NFTI) identifies severely depleted reserves (NFTI+) with emergent interventions and/or early mortality. We hypothesized NFTI would have stronger associations with outcomes and better model fit than ISS and RTS. METHODS Thirty-eight adult and pediatric U.S. trauma centers submitted data for 88,488 encounters. Mixed models tested ISS greater than 15, RTS less than 7.84, and NFTI's associations with complications, survivors' discharge to continuing care, and survivors' length of stay (LOS). RESULTS The NFTI had stronger associations with complications and LOS than ISS and RTS (odds ratios [99.5% confidence interval]: NFTI = 9.44 [8.46–10.53]; ISS = 5.94 [5.36–6.60], RTS = 4.79 [4.29–5.34]; LOS incidence rate ratios (99.5% confidence interval): NFTI = 3.15 [3.08–3.22], ISS = 2.87 [2.80–2.94], RTS = 2.37 [2.30–2.45]). NFTI was more strongly associated with continuing care discharge but not significantly more than ISS (relative risk [99.5% confidence interval]: NFTI = 2.59 [2.52–2.66], ISS = 2.51 [2.44–2.59], RTS = 2.37 [2.28–2.46]). Cross-validation revealed that in all cases NFTI's model provided a much better fit than ISS greater than 15 or RTS less than 7.84. CONCLUSION In this multicenter study, NFTI had better model fit and stronger associations with the outcomes than ISS and RTS. By determining depletion of reserve via resource consumption, NFTI+ may be a better definition of major trauma than the standard definitions of ISS greater than 15 and RTS less than 7.84. Using NFTI may improve retrospective triage monitoring and statistical risk adjustments. LEVEL OF EVIDENCE Prognostic, level IV.

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Experiencing a traumatic event and then the required care for the physical injuries can elicit stress symptoms in the injured child and parents. Stress-related symptoms affect a significant number of injured children and can have an impact on emotional and physical health outcomes after injury. Yet the majority of children who suffer from posttraumatic stress disorder postinjury go undiagnosed and untreated. Medical traumatic stress symptoms that occur often as adaptive responses initially can persist. Acute stress disorder is diagnosed when the stress symptoms persist less than 1 month postinjury and affect normal functioning. Inclusion of screening for acute stress and the development of models and guidelines are needed to systematically incorporate the care for the emotional trauma as an integral part of pediatric trauma care. Pediatric trauma nurses with knowledge and resources are in a position to minimize potentially traumatic aspects of the care they deliver, recognize traumatic stress symptoms, and help parents to support their child's coping and promote appropriate help seeking.