From trauma to chronicity: Understanding the incidence and early immune changes of chronic complications in polytrauma patients.

Objective: Polytrauma is a complex condition associated with poor outcomes and high mortality rates resulting from severe damage and complicated complications. This study sought to ascertain the incidence of chronic complications in polytrauma patients, as well as the early immune changes and risk factors.

Methods: A multicenter, prospective and observational cohort study was conducted at the emergency surgery or traumatic intensive care unit (TICU) of the Advanced Trauma Center from August 2020 to July 2023. A total of 2033 consecutive trauma patients were included in the study. In the first 1, 7, and 14 days after admission, flow cytometry and immunoassay kits were used to examine cytokine release and lymphocyte count.

Results: Trauma patients were reported 33.8% (687/2033) chronic complication rates, with monotrauma patients reported 8.1% (55/683) and polytrauma patients reported 59.4% (802/1350). And the four most frequent chronic complications in polytrauma patients were chronic musculoskeletal pain (30.4%), post-traumatic osteoarthritis (27.2%), chronic wound (21.6%), and chronic lung injury (14.1.%) .There were significant differences in lymphocyte ratios and cytokine levels, at 1, 7, and 14 day of admission between chronic complication groups (CCP) and not chronic complication groups (N-CCP) in polytrauma. Polytrauma patients with characteristics of higher ratio of Ts ratio (95% CI: 2.01-6.21), Treg (95% CI: 1.12-5.43) and level of IL-6 (95% CI: 1.22-4.43), TNF-α (95% CI: 1.05-3.83), IL-10 (95% CI: 2.01-6.84) were found to have a higher likelihood of experiencing a chronic complication. Conversely, a higher ratio of Tc (95% CI: 0.53-0.86), Th (95% CI: 0.64-0.95) and Th/Ts (95% CI: 0.21-0.64) were identified as independent protective factors against a chronic complication event.

Conclusion: Polytrauma patients exhibit a notable prevalence of chronic complications. Some immune and inflammatory indicators can be observed early in combination after injury to predict the risk of chronic complications after polytrauma.