Introduction: Trauma centers have improved outcomes compared to nontrauma centers when caring for injured patients. A multicenter report found blunt trauma patients treated at American College of Surgeons' Level I trauma centers have improved survival compared to Level II centers. In a subsequent multicenter study, Level II centers had improved survival in all trauma patients. We sought to provide a more granular analysis by stratifying blunt mechanisms-to determine if there was a difference in mortality between Level I and Level II centers.
Methods: The Trauma Quality Improvement Program (2010-2016) was queried for patients presenting to an American College of Surgeons' Level I or II trauma center after blunt trauma. A multivariable logistic regression analysis was performed controlling for comorbidities and Trauma and Injury Severity Score.
Results: From 734,473 patients with blunt trauma, 507,715 (69.1%) were treated at a Level I center and 226,758 (30.9%) at a Level II center. The Level I cohort was younger (median age, 53 versus 58, P = 0.01), with a higher median injury severity score (13 versus 10, P < 0.001) and with more patients presenting after a motor vehicle accident (MVA) (27.9% versus 22.4%, P < 0.001) and lower rates of falls (46.6% versus 54.5%, P < 0.001). After adjusting for covariates, there was no difference in mortality between Level I and Level II centers (P > 0.05). When stratifying by mechanisms, Level I centers had a decreased associated mortality for MVA (odds ratio = 0.94, CI: 0.88-0.99, P = 0.04) and bicycle accidents (odds ratio = 0.77, CI: 0.74-0.03, P = 0.01) but no difference in falls or pedestrians struck (P > 0.05).
Conclusions: Overall, blunt trauma patients presenting to a Level I center have no difference in mortality compared to a Level II center. However, when stratified by mechanism, those involved in MVA or bicycle accidents have a decreased associated risk of mortality. Future prospective studies examining variations in practice to account for these differences are warranted.
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