Association of the Revised Trauma Score with Mortality and Prehospital LSI Among Trauma and Non-Trauma Patients.

Objectives: The combination of broad conditional applicability and ease of data collection make some general risk scores an attractive tool for clinical decision making under acute care conditions. To date, general risk scores have demonstrated moderate levels of accuracy for key outcomes, but there are no definitive general scores integrated universally into prehospital care. The objective of our study was to demonstrate a relationship between the Revised Trauma Score (RTS) and prehospital lifesaving interventions (LSI) and downstream hospital mortality among a large, diverse, multi-year cohort of critical care transport patients. We hypothesized that the RTS is associated with mortality and prehospital LSI generally across all conditions, including non-trauma.

Methods: We conducted a retrospective observational study using a pre-established cohort of sequentially enrolled patients from a regional air medical service between the years 2012 and 2021. Pediatric patients, non-transports, and those transported to hospitals outside the regional health system were excluded from the study. Both trauma and non-trauma patients were included in this study. We performed logistic regressions to evaluate the association between RTS and the outcomes of LSI and hospital mortality, while controlling for age, sex, and medical category. Graphs were constructed to plot RTS against prehospital LSI and survival percentage.

Results: Our final patient cohort was 62,424 patients. 58.4% of all patients required a prehospital LSI. Non-trauma cases made up 69.7% of the patient population. The Revised Trauma Score was inversely proportional with both prehospital LSI and mortality. The logistic regression model yielded an odds ratio (OR) of 0.55 (95% CI 0.54 - 0.56) for the association between RTS and death. Additionally, when the components of RTS were associated with mortality, they each showed a statistically significant OR. The Revised Trauma Score was also associated with prehospital LSI (OR 0.10; 95% CI 0.03 - 0.33).

Conclusions: In a large helicopter EMS cohort of both trauma and non-trauma patients, the RTS was inversely associated with prehospital LSI and hospital mortality. The generalized utility of RTS demonstrated in our study warrants further investigation of this measure as a broader triage tool.