Assessing the role of chest CT in minor blunt trauma: evaluation of the NEXUS decision instrument across an expanded population

Objective: To evaluate the NEXUS Chest CT ALL decision instrument (DI) in reducing unnecessary chest CT imaging in minor blunt trauma patients while preserving high sensitivity for detecting clinically meaningful injuries. Additionally, we examined the impact of delayed presentation, chronic disease, and anticoagulation/anti-aggregation medications on trauma outcomes. Methods: This retrospective study included 853 adult minor blunt trauma patients who underwent chest CT in the emergency department (ED) of Tel-Aviv Sourasky Medical Center between 2018 and 2022. Clinically meaningful outcomes were defined as trauma-related interventions or hospital admissions. The NEXUS Chest CT DI criteria, along with three additional criteria, were analyzed using logistic regression to identify independent predictors for the primary outcome. These predictors formed a modified DI, and its performance was compared to the original NEXUS DI. Results: Among 853 patients (median age 44.5 years, 64.2% male), 230 (27.0%) had trauma-related chest CT findings, and 64 (7.5%) experienced clinically meaningful outcomes. Independent predictors included abnormal chest X-ray (aOR 6.5, p < 0.001), chronic disease (aOR 5.2, p < 0.001), sternal tenderness (aOR 4.7, p = 0.007), rapid deceleration (aOR 3.7, p < 0.001), and chest wall tenderness (aOR 3.1, p < 0.001). The NEXUS DI achieved 92.1% sensitivity, reducing imaging by 41.3%, while the modified DI increased sensitivity to 98.4% with a 34.3% imaging reduction. Conclusions: The NEXUS Chest CT ALL DI significantly reduces unnecessary imaging while maintaining high diagnostic precision. A modified version enhances sensitivity, refining decision-making in emergency care. Integrating such decision tools, particularly in cases of minor trauma, is highly recommended to optimize resource use and improve patient outcomes.