Abstract
Background
Several novel biomarkers that predict acute kidney injury (AKI) have recently been proposed. We have evaluated the sequential patterns of biomarker elevation after pediatric cardiopulmonary bypass (CPB) and determined their diagnostic accuracy.
Methods
We measured the ability of neutrophil gelatinase-associated lipocalin (NGAL), interleukin-18 (IL-18), liver type fatty-acid binding protein (L-FABP), kidney injury molecule-1 (KIM-1), tissue inhibitor of metalloproteinase-2 (TIMP-2), and insulin-like growth factor binding protein 7 (IGFBP7), to predict AKI (≥50% increase in serum creatinine from baseline). Areas under the receiver-operator characteristic curves (AUCs) were calculated for each biomarker and for various biomarker combinations at multiple time points after CPB.
Results
Of 150 patients examined, AKI had developed in 50 patients by 24 h after CPB, with an elevated NGAL concentration first noted at 2 h post-CPB, increases in IL-18, L-FABP, and the product of TIMP-2 and IGFBP7 first noted at 6 h, and an elevated KIM-1 level noted at 12 h. At each time point, urine NGAL remained the marker with the highest predictive ability (AUC > 0.9). The addition of any other biomarker did not increase the predictive accuracy of NGAL alone at 2 and 6 h. At 12 h, when compared to NGAL alone, the combination of NGAL, IL-18, and TIMP2 improved the AUC for AKI prediction (from 0.938 to 0.973).
Conclusions
While urine NGAL remains a superior stand-alone test at the 2 and 6 h time points after pediatric CPB, a panel of carefully selected biomarkers may prove optimal at later time points.
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Acknowledgments
PD has received funding from the National Institutes of Health (grant number P50 DK096418). We are grateful to Dr. Jun Ying for assistance with the statistical analysis.
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This single-center case–control study was approved by the Institutional Review Board of Cincinnati Children’s Hospital Medical Center. Written informed consent from the legal guardian, and assent from the patient when appropriate, were obtained prior to enrollment.
Disclosures
P.D. is a co-inventor on patents (7,776,824 and 7,977,110) related to NGAL as a biomarker of kidney injury, and declares licensing agreements with BioPorto Diagnostics and Abbott Diagnostics. All other authors have no conflicts of interest to report.
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Dong, L., Ma, Q., Bennett, M. et al. Urinary biomarkers of cell cycle arrest are delayed predictors of acute kidney injury after pediatric cardiopulmonary bypass. Pediatr Nephrol 32, 2351–2360 (2017). https://doi.org/10.1007/s00467-017-3748-7
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DOI: https://doi.org/10.1007/s00467-017-3748-7