Urinary neutrophil gelatinase-associated lipocalin distinguishes pre-renal from intrinsic renal failure and predicts outcomes.

Urinary neutrophil gelatinase-associated lipocalin distinguishes pre-renal from intrinsic renal failure and predicts outcomes.
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DOI:
10.1038/ki.2011.41
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发表时间:
2011-08
影响因子:
19.6
通讯作者:
--
中科院分区:
医学1区
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在已确诊的急性肾损伤 (AKI) 中,血清肌酐很难区分肾前性 AKI 和内源性 AKI。中性粒细胞明胶酶相关脂质运载蛋白(NGAL)是一种与损伤相关的肾单位生物标志物,可能是更好的鉴别器。我们测试了尿液 NGAL 区分内在性 AKI 和肾前性 AKI 的假设,并测试了其在预测复合结果中的表现,其中包括进展为更高的 RIFLE(“风险、损伤、衰竭、功能丧失、终末期肾病”)严重级别、透析或死亡。我们使用标准化临床平台测量了 161 名已确诊 AKI 的住院患者的尿液 NGAL。我们排除了 16 名肾后梗阻或临床信息不足的患者。其余 145 名患者中,75 名患者患有内在 AKI,32 名患者患有肾前性 AKI,38 名患者无法分类。我们发现尿液 NGAL 水平可以有效区分内源性 AKI 和肾前性 AKI(ROC 0.87,CI 0.81-0.94)。 NGAL 水平 >104 μg/L 表明内在 AKI(似然比 5.97),而 NGAL 水平 <47 μg/L 则不太可能是内在 AKI(似然比 0.2)。经历复合结果的患者在纳入时具有较高的中位尿 NGAL 水平(248.2 vs. 68.3 μg/L,p<0.001)。在逻辑回归分析中,NGAL 在针对人口统计、合并症、肌酐和 RIFLE 类别进行校正后独立预测了复合结果。因此,尿液 NGAL 可用于对已确诊 AKI 的患者进行分类和分层。
In established acute kidney injury (AKI), serum creatinine poorly differentiates prerenal and intrinsic AKI. A damage-associated nephron biomarker, neutrophil gelatinase-associated lipocalin (NGAL) could be a better discriminator. We tested the hypothesis that urinary NGAL distinguishes intrinsic and prerenal AKI, and tested its performance in the prediction of a composite outcome that included progression to a higher RIFLE (“risk, injury, failure, loss of function, end stage renal disease”) severity class, dialysis, or death. We measured urinary NGAL in 161 hospitalized patients with established AKI using a standardized clinical platform. We excluded 16 patients with postrenal obstruction or insufficient clinical information. Of the remaining 145 patients, 75 patients had intrinsic AKI, 32 patients had prerenal AKI, and 38 patients could not be classified. We found that urinary NGAL levels effectively discriminated intrinsic AKI from prerenal AKI (ROC 0.87, CI 0.81-0.94). An NGAL level >104 μg/L indicated intrinsic AKI (likelihood ratio 5.97), while an NGAL level <47 μg/L made intrinsic AKI unlikely (likelihood ratio 0.2). Patients experiencing the composite outcome had higher median urinary NGAL levels on inclusion (248.2 vs. 68.3 μg/L, p<0.001). In logistic regression analysis, NGAL independently predicted the composite outcome, when corrected for demographics, co-morbidities, creatinine, and RIFLE class. Hence, urinary NGAL is useful in classifying and stratifying patients with established AKI.
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