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Background: Traumatic brain injury (TBI) causes substantial morbidity and long-term neuropsychiatric sequelae. Bacterial meningitis may worsen outcomes after TBI, yet its mental-health impact is undercharacterized. This study examined 90-day neuropsychiatric outcomes following post-traumatic meningitis.
Methods: We performed a retrospective cohort study using the TriNetX Global Collaborative Network. Two propensity-matched cohorts were assembled: severe TBI with subsequent bacterial meningitis and severe TBI without meningitis (2,977 patients each). Outcomes included post-concussional syndrome, amnesia, altered mental status, depressive episodes, anxiety disorders, and non-psychotic mental disorders. We estimated risks, risk ratios, and odds ratios, and generated Kaplan–Meier survival curves and instance-based frequency analyses.
Results: Compared with TBI without meningitis, post-traumatic meningitis was associated with higher risk of amnesia (RR 2.65), altered mental status (RR 5.32), depressive episodes (RR 2.12), and anxiety (RR 2.05). Post-concussional syndrome risk was lower (RR 0.41). No difference was observed for non-psychotic mental disorders. Kaplan–Meier analyses showed significantly lower symptom-free probabilities for most outcomes.
Conclusion: Post-traumatic bacterial meningitis substantially increases early neuropsychiatric complications after severe TBI, highlighting the need for proactive psychiatric evaluation, neurocognitive monitoring, and tailored rehabilitation in this high-risk population. Findings support early infection prevention and integrated neurocritical care pathways implementation.