Abstract
Background
In infants, oliguria is defined as a urine output of <1.5 mL/kg/h. The aim of our study was to assess the impact of oliguria on urinary neutrophil gelatinase-associated lipocalin (NGAL) and serum cystatin C (CysC) levels in very-low-birth-weight infants (VLBWIs) with a normal serum creatinine (Cr) level.
Methods
Fifty-seven VLBWIs were enrolled in the study. Urinary NGAL, serum CysC and Cr levels and urinary NGAL/Cr ratios were measured. Infants with Apgar scores of >5 at 5 min and/or a serum Cr level of >1.5 mg/dL or those treated for patent ductus arteriosus were excluded. In case of antibiotic treatment, blood and urine samples were collected at ≥48 h after discontinuation of antibiotic treatment.
Results
There was a significant difference in gestational age between infants with oliguric episodes during hospitalization and those without, but not in birth weight, perinatal or postnatal factors. Gestational age was negatively correlated with urinary NGAL and serum CysC levels and urinary NGAL/Cr ratio (p < 0.05), whereas postnatal age was negatively correlated with serum Cr level and urinary NGAL/Cr ratio (p < 0.05). Of the 117 urine and blood samples collected, 25 (21.4%) were obtained from neonates with oliguric episodes. After adjusting for gestational age and postnatal age, comparison of samples collected in infants with and without oliguric episodes revealed significant differences in the mean level of urinary NGAL and in the urinary NGAL/Cr ratio, but not in mean serum CysC or serum Cr levels. The urinary NGAL level [area under the curve (AUC) 0.886, 95% confidence interval (CI) 0.814–0.937] and urinary NGAL/Cr ratio (AUC 0.853, 95% CI 0.775–0.911) showed significantly greater discrimination for oliguria than serum CysC (AUC 0.610, 95% CI: 0.515–0.699) or serum Cr (AUC 0.747, 95%CI 0.659–0.823) levels.
Conclusions
Urinary NGAL level and urinary NGAL/Cr ratio were more sensitive markers for the presence of oliguria in VLBWIs with normal serum Cr levels than serum CysC level.
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This research was supported by a Bisa Research Grant of Keimyung University in 2015.
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The authors have no conflicts of interest to disclose.
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Data collection was approved by the Institutional Review Board of Keimyung University Dongsan Medical Center. The IRB waived the requirement for informed consent in this retrospective chart review.
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So Young Shin and Ji Yong Ha contributed equally to this work.
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Shin, S.Y., Ha, J.Y., Lee, S.L. et al. Increased urinary neutrophil gelatinase-associated lipocalin in very-low-birth-weight infants with oliguria and normal serum creatinine. Pediatr Nephrol 32, 1059–1065 (2017). https://doi.org/10.1007/s00467-016-3572-5
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DOI: https://doi.org/10.1007/s00467-016-3572-5