Abstract
Background
With adult patients, the measurement of [TIMP-2]*[IGFBP7] can predict the risk of moderate to severe AKI within 12 h of testing. In pediatrics, however, the performance of [TIMP-2]*[IGFBP7] as a predictor of AKI was less studied and yet to be widely utilized in clinical practice. This study was conducted to validate the utility of [TIMP-2]*[IGFBP7] as an earlier biomarker for AKI prediction in Chinese infants and small children.
Methods
We measured urinary [TIMP-2]*[IGFBP7] using NEPHROCHECK® at eight perioperative time points in 230 patients undergoing complex cardiac surgery and evaluated the performance of [TIMP-2]*[IGFBP7] for predicting severe AKI within 72 h of surgery.
Results
A total of 50 (22%) of 230 developed AKI stages 2–3 within 72 h after CPB initiation. In the AKI stage 2–3 patients, two patterns of serum creatinine (SCr) elevations were observed. The patients with only a transient increase in SCr within 24 h (< 24 h, early AKI 2–3) did not experience a worse outcome than patients in AKI stage 0–1. AKI stage 2–3 patients with SCr elevation after 24 h (24–72 h, late AKI 2–3), as well as AKI dialysis patients (together designated severe AKI), did experience worse outcomes. Compared to AKI stages 0–1, significant elevations of [TIMP-2]*[IGFBP7] values were observed in severe AKI patients at hours T2, T4, T12, and T24 following CPB initiation. The AUC for predicting severe AKI with [TIMP-2]*[IGFBP7] at T2 (AUC = 0.76) and maximum T2/T24 (AUC = 0.80) are higher than other time points. The addition of the NEPHROCHECK® test to the postoperative parameters improved the risk assessment of severe AKI.
Conclusions
Multiple AKI phenotypes (early versus late AKI) were identified after pediatric complex cardiac surgery according to SCr-based AKI definition. Urinary [TIMP-2]*[IGFBP7] predicts late severe AKI (but not early AKI) as early as 2 h following CPB initiation.
Graphical abstract
A higher resolution version of the Graphical abstract is available as Supplementary information
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Data availability
All datasets underlying the manuscript results are available upon request to the corresponding author (XZM).
Abbreviations
- AKI:
-
Acute kidney injury
- CPB:
-
Cardiopulmonary bypass
- SCr:
-
Serum creatinine
- KDIGO:
-
Kidney Disease Improving Global Outcomes
- TIMP-2:
-
Tissue inhibitor metalloproteinases-2
- IGFBP7:
-
Insulin-like growth factor-binding protein 7
- RACHS:
-
Risk adjusted classification for congenital heart surgery
- RACHS-1:
-
Risk adjustment for congenital heart surgery score version 1
- IQR:
-
Inter-quantile range
- ROC:
-
Receiver operating curve
- AUC:
-
Area under curve
- CI:
-
Confidence intervals
- MVIS:
-
Maximal vasoactive inotrope scores
- CSA-AKI:
-
Cardiac surgery-associated acute kidney injury
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Acknowledgements
Zhuoming Xu, Wei Wang, and Ji Liang are co-corresponding authors for this study. We would like to thank the patients and their parents for their support and participation in this study. This work was supported by the Shanghai Key Laboratory of Clinical Molecular Diagnostics for Pediatrics (20dz2260900).
Funding
This work was supported by the Shanghai Key Laboratory of Clinical Molecular Diagnostics for Pediatrics (20dz2260900).
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Contributions
Y Tao, F Heskia, JH Huang, J Liang, W Wang, and ZM Xu designed the study. R Qin, Y Tao, MJ Zhang, LQ Chen, and F Wu collected patient data and samples. LQ Chen and F Wu performed NEPHROCHECK® tests. B Kang, Y Tao, F Heskia, HW Chen, J Liang, and ZM Xu analyzed the data. Y Tao, F Heskia, MJ Zhang, K Brengel-Pesce, X Mo, J Liang, W Wang, and ZM Xu discussed the results and performed additional analyses. The first draft of the manuscript was written by Y Tao, F Heskia, B Kang, LQ Chen, J Liang, and ZM Xu, and all authors commented on previous versions of the manuscript. ZM Xu, W Wang, and J Liang take responsibility for the content of the manuscript and the accuracy of the reported data. All authors read and approved the final manuscript.
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The study was approved by the Institutional Review Board and the Ethics Committee of Shanghai Children’s Medical Center (SCMCIRB-K2019009). Written informed consent was obtained from all participating patients and/or their parents. Clinical Trial Registry Number: NCT03963284.
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Tao, Y., Heskia, F., Zhang, M. et al. Evaluation of acute kidney injury by urinary tissue inhibitor metalloproteinases-2 and insulin-like growth factor-binding protein 7 after pediatric cardiac surgery. Pediatr Nephrol 37, 2743–2753 (2022). https://doi.org/10.1007/s00467-022-05477-6
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DOI: https://doi.org/10.1007/s00467-022-05477-6