Erschienen in:
01.04.2015 | Original Article
Cystatin C in acute kidney injury diagnosis: early biomarker or alternative to serum creatinine?
verfasst von:
Paola Lagos-Arevalo, Ana Palijan, Laura Vertullo, Prasad Devarajan, Michael R. Bennett, Venkata Sabbisetti, Joseph V. Bonventre, Qing Ma, Ronald D. Gottesman, Michael Zappitelli
Erschienen in:
Pediatric Nephrology
|
Ausgabe 4/2015
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Abstract
Background
Early acute kidney injury (AKI) diagnosis is needed to pursue treatment trials. We evaluated cystatin C (CysC) as an early biomarker of serum creatinine (SCr)-AKI and an alternative to define AKI.
Methods
We studied 160 non-cardiac children in the intensive care unit (ICU). We measured daily CysC and SCr. AKI was staged by KDIGO (Kidney Disease: Improving Global Outcomes) guidelines using SCr and CysC (CysC-AKI). We calculated area under the curve (AUC) for (1) neutrophil gelatinase-associated lipocalin (NGAL), interleukin-18 (IL-18), kidney injury molecule-1 (KIM-1) and urine CysC to diagnose SCr- and CysC-AKI; and (2) for CysC to diagnose SCr-AKI. We evaluated AKI associations with length of stay and ventilation duration.
Results
We found that 44 % of patients developed SCr-AKI; 32 % developed CysC-AKI. Early ICU NGAL was most diagnostic of CysC-AKI (AUC 0.69, 95% CI 0.54–0.84); IL-18 was most diagnostic for SCr-AKI (AUC 0.69 95% CI 0.55–0.82). Combining SCr and CysC-AKI definition led to higher biomarker diagnostic AUC’s. CysC-AKI was not more strongly associated with clinical outcomes. Early ICU CysC predicted SCr-AKI development (AUC 0.70, 95 % CI 0.53–0.89).
Conclusions
Our findings do not support replacing SCr by CysC to define AKI. Early ICU CysC predicts SCr-AKI development and combined SCr-CysC-AKI definition leads to stronger AKI biomarker associations.