Incidence and Associated Risk Factors of ARC in the Trauma Critically Ill Older Than 50 Years Old

Inclusion Criteria: * Admission to the ICU for isolated traumatic brain injury (TBI), polytrauma without TBI or combined polytrauma and TBI * Expected ICU length of stay of more than 24 hours * Age of ≥ 50 years old at the time of admission * Serum creatinine ≤ 120 μmol/L at the time of admission * Presence of an indwelling urinary catheter * Consent is obtained from the patient or its surrogate decision-maker within 7 days of ICU admission Exclusion Criteria: * History of renal replacement therapy (RRT) (intermittent dialysis or peritoneal dialysis), nephrectomy or renal transplant * Patient developing acute kidney injury (AKI) * ICU physician considered patient unsuitable for enrollment due to poor prognosis * Burn-related trauma * Patient is admitted \> 48 hours post-traumatic event