Safety concerns associated with high-dose continuous infusion of cefepime among critically ill patients with mild renal impairment to augmented renal clearance at a level 1 trauma center: CEFTOX study.

High-dose continuous infusion of cefepime is frequently employed in ICU patients with a creatinine clearance above 60 mL/min. The CEFTOX study aimed to investigate whether this regimen could lead to cefepime overexposure and cefepime-induced neurotoxicity (CIN) in a cohort of severe trauma and brain-injured patients. This retrospective cohort study included patients from a Level 1 Trauma Center who received a continuous infusion of 6 g/day of cefepime and had a therapeutic drug monitoring (TDM) within 24-48 h of treatment initiation. They were divided into three groups based on creatinine clearance: mild renal impairment (60-90 mL/min), normal clearance (90-150 mL/min), and augmented renal clearance (ARC) (>150 mL/min). The primary outcome was cefepime overexposure. A key secondary outcome was CIN. One hundred and sixty-two critically ill patients were included: 84 with ARC, 62 with normal renal clearance, and 16 with mild renal impairment. Cefepime overexposure occurred in 72 (44.4%) patients. While 50% of patients with normal renal clearance experienced overexposure, the rate was higher in those with mild renal impairment (87.5%) and lower in those with ARC (32.1%;