Epidemiology, Risk Factors, and Predictive Modelling of Post-Traumatic Sepsis: A Retrospective Cohort Study.

Objective: This study aimed to evaluate the distribution spectrum and epidemiological characteristics associated with post-traumatic sepsis and to identify associated risk factors. Methods: This retrospective study analyzed data from 722 patients with traumatic injuries admitted to the Emergency Department of the Hebei Medical University Third Hospital between January 1, 2021, and November 30, 2023. Participants were categorized into two groups: those who developed sepsis and those who did not. Patients diagnosed with sepsis were further categorized into survival and non-survival subgroups. Patient demographics, injury characteristics, and clinical variables were collected. Sepsis occurrence was assessed within the first week post-injury. Multivariate logistic regression analysis was performed to identify independent risk factors for post-traumatic sepsis. Results: Among 722 trauma patients, 189 developed sepsis. In the sepsis cohort, injuries were mainly from traffic accidents (54.5%), falls from heights (17.46%), crush injuries (13.76%), and falls/collisions (11.64%). In contrast, non-sepsis cases (n=533) were predominantly due to falls/collisions (43.15%) and traffic accidents (36.02%). Pulmonary infection was the leading site in both survivors (95.62%) and non-survivors (100%), with some patients presenting multiple infection sites. A predictive model for post-traumatic sepsis, incorporating 10 variables such as hospitalization length and injury site number, achieved excellent performance (AUROC 0.998). A sepsis mortality model, based on five variables including age and injury sites, also showed high accuracy (AUROC 0.969). Conclusion: Traffic accidents were the primary cause of post-traumatic sepsis. Key risk factors included injury severity, CRP level, and hospitalization duration. Independent predictors of 28-day mortality included age, organ failure score, and vasoactive drug use.