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  • Title: Urinary neutrophil gelatinase-associated lipocalin predicts kidney outcome and death in patients with cirrhosis and bacterial infections.
    Author: Barreto R, Elia C, Solà E, Moreira R, Ariza X, Rodríguez E, Graupera I, Alfaro I, Morales-Ruiz M, Poch E, Guevara M, Fernández J, Jiménez W, Arroyo V, Ginès P.
    Journal: J Hepatol; 2014 Jul; 61(1):35-42. PubMed ID: 24613364.
    Abstract:
    BACKGROUND & AIMS: Infections in cirrhosis are frequently complicated by kidney dysfunction that entails a poor prognosis. Urinary biomarkers may be of potential clinical usefulness in this setting. We aimed at assessing the value of urinary neutrophil gelatinase-associated lipocalin (uNGAL), a biomarker overexpressed in kidney tubules during kidney injury, in predicting clinical outcomes in cirrhosis with infections. METHODS: One-hundred and thirty-two consecutive patients hospitalized with infections were evaluated prospectively. Acute kidney injury (AKI) was defined according to AKIN criteria. uNGAL was measured at infection diagnosis and at days 3 and 7 (ELISA, Bioporto, DK). RESULTS: Patients with AKI (n=65) had significantly higher levels of uNGAL compared to patients without AKI (203 ± 390 vs. 79 ± 126 μg/g creatinine, p<0.001). Moreover, uNGAL levels were significantly higher in patients who developed persistent AKI (n=40), compared to those with transient AKI (n=25) (281 ± 477 vs. 85 ± 79 μg/g creatinine, p<0.001). Among patients with persistent AKI, uNGAL was able to discriminate type-1 HRS from other causes of AKI (59 ± 46 vs. 429 ± 572 μg/g creatinine, respectively; p<0.001). Moreover, the time course of uNGAL was markedly different between the two groups. Interestingly, baseline uNGAL levels also predicted the development of a second infection during hospitalization. Overall, 3-month mortality was 34%. Independent predictive factors of 3-month mortality were MELD score, serum sodium, and uNGAL levels at diagnosis, but not presence or stage of AKI. CONCLUSIONS: In patients with cirrhosis and infections, measurement of urinary NGAL at infection diagnosis is useful in predicting important clinical outcomes, specifically persistency and type of AKI, development of a second infection, and 3-month mortality.
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