Oral vs. Intravenous Hydration to Prevent Contrast-Associated Acute Kidney Injury in the ED

This study is planned to be conducted by emergency physicians between November 7, 2025, and December 7, 2026. Inclusion and Exclusion Criteria The study will include adult patients aged 18 years and older who are considered at risk for Contrast-Associated Acute Kidney Injury (CA-AKI), with an estimated Glomerular Filtration Rate (eGFR) between 15-59 ml/min/1.73 m², a clinical indication for contrast-enhanced CT, and who have provided signed informed consent. Exclusion criteria are as follows: Pregnant women. Patients with a known contrast media allergy. Contrast media exposure within the last 72 hours. End-stage renal disease (ESRD) with eGFR \<15 ml/min/1.73 m² or those receiving dialysis. Patients with clinical decompensated heart failure. Patients for whom oral intake is contraindicated or not tolerated. Randomization and Interventions Prior to randomization, the oral intake capacity of eligible patients will be verified. Participants will be randomized into two groups-IV hydration and oral hydration-at a 1:1 ratio using stratified block randomization based on age and gender. IV Hydration Group: Isotonic 0.9% NaCl solution will be administered. The regimen consists of 3 ml/kg for 1 hour pre-procedure, followed by 2 ml/kg/hour for 4 hours post-procedure. Patients with an ejection fraction (EF) \<40% will receive half-doses (1.5 ml/kg pre-procedure; 1 ml/kg/hour for 4 hours post-procedure). Oral Hydration Group: Drinking water will be administered under nursing su…

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