Short- and Long-Term Mortality in Severely Injured Older Trauma Patients: A Retrospective Analysis

<b>Background/Objectives</b>: Older trauma patients experience increased in-hospital mortality due to the physiological challenges associated with aging and injury severity. However, limited data exist on long-term mortality rates beyond hospital discharge, particularly among severely injured elderly trauma patients. Understanding these outcomes is essential for improving clinical management and rehabilitation strategies. The objective of this study was to evaluate cumulative mortality rates (in-hospital, 28-day, 1-year, 2-year, and 3-year) in older trauma patients with an Injury Severity Score (ISS) ≥ 16. Independent risk factors for 1-year mortality were also identified. <b>Methods</b>: This retrospective cohort study included all trauma patients aged ≥ 65 years with ISS ≥ 16 admitted to the Emergency Department of our level 1 trauma center between January 2017 and December 2022. Demographic characteristics, injury patterns (Abbreviated Injury Scale (AIS) scores, ISS), and mortality rates were collected from electronic health records. Patients were stratified into two age groups: 65-80 years and >80 years. Mortality rates were compared with those in the corresponding age groups in the general Swiss population. Statistical analysis included Kaplan-Meier survival curves and logistic regression for identifying risk factors associated with 1-year mortality. <b>Results</b>: A total of 1189 older trauma patients with a mean ISS of 24.3 ± 7.9 were included. The most common injury was severe head trauma (AIS head ≥ 3: 70.6%), followed by chest trauma (AIS chest ≥ 3: 28.2%) and extremity injuries (AIS extremity ≥ 3: 17.4%). The overall in-hospital mortality rate was 10.3%. Mortality rates at 28 days, 1 year, 2 years, and 3 years were 15.8%, 26.5%, 31.5%, and 36.3%, respectively. Age-stratified analysis showed significantly higher mortality rates in patients aged > 80 years compared to the 65- to 80-year group at all post-discharge time points (28-day: 22.6% vs. 11.9%, <i>p</i> < 0.001; 1-year: 39.9% vs. 18.8%, <i>p</i> < 0.001; 2-year: 46.5% vs. 22.8%, <i>p</i> < 0.001; 3-year: 56.4% vs. 24.9%, <i>p</i> < 0.001). Compared to the general Swiss population, we observed significantly higher mortality rates at all measured time points in elderly trauma patients, particularly in those aged over 80 years, with 1-year mortality rates of 39.9% vs. 10% in the general population and 3-year mortality rates of 56.4% vs. 30% in the general population. Independent risk factors for 1-year mortality included advanced age and severe head injury (AIS head ≥ 3, <i>p</i> < 0.001). <b>Conclusions</b>: Severely injured elderly trauma patients face high long-term mortality risks, with 1-year mortality rates reaching 26.5% overall and nearly 40% in patients aged > 80 years. These findings highlight the need for research on tailored, holistic management strategies, including comprehensive in-hospital care, specialized neurorehabilitation, and post-discharge follow-up programs to improve survival and functional recovery in this vulnerable population.