• Pierre Delanaye, Etienne Cavalier, Jérôme Morel, Manolie Mehdi, Nicolas Maillard, Guillaume Claisse, Bernard Lambermont, Bernard E Dubois, Pierre Damas, Jean-Marie Krzesinski, Alexandre Lautrette, and Christophe Mariat.
• Department of Nephrology-Dialysis, University of Liège, CHU Sart Tilman, Liège 4000, Belgium. pierre_delanaye@yahoo.fr.
• Bmc Nephrol. 2014 Jan 1;15:9.

BackgroundDetecting impaired glomerular filtration rate (GFR) is important in intensive care units (ICU) in order to diagnose acute kidney injuries and adjust the dose of renally excreted drugs. Whether serum Cystatin C (SCysC) may better reflect glomerular filtration rate than serum creatinine (SCr) in the context of intensive care medicine is uncertain.MethodsWe compared the performance of SCysC and SCr as biomarkers of GFR in 47 critically ill patients (median SOFA (Sepsis-related Organ Failure Assessment) score of 5) for whom GFR was measured by a reference method (urinary clearance of iohexol).ResultsMean Iohexol clearance averaged 96 ± 54 mL/min and was under 60 mL/min in 28% of patients. Mean SCr and SCysC concentrations were 0.70 ± 0.33 mg/dL and 1.26 ± 0.61 mg/L, respectively. Area under the ROC curve for a GFR threshold of 60 mL/min was 0.799 and 0.942 for SCr and SCysC, respectively (p = 0.014).ConclusionsWe conclude that ScysC significantly outperfoms SCr for the detection of an impaired GFR in critically ill patients.Trial RegistrationClinicalTrials.gov: B7072006347.

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