Abstract
Acute kidney injury (AKI) is defined by a rise in serum creatinine, fall in urine output or both. Numerous new biomarkers of AKI have been identified and validated in different experimental and clinical scenarios with the aims of overcoming some of the short-comings of serum creatinine, improving the management of patients with AKI and advancing our understanding of AKI. The most studied biomarkers are neutrophil gelatinase-associated lipocalin, cystatin C, Kidney Injury Molecule 1 and Interleukin 18. Studies have shown that some biomarkers are able to indicate AKI before a detectable serum creatinine rise, in particular after surgery or following coronary angiography but also in patients presenting to the emergency department and on admission to the Intensive Care Unit. Other studies demonstrated that biomarker levels correlated with severity of AKI and were predictive of renal recovery, need for renal replacement therapy or mortality. However, the results have been conflicting and confounded. While new biomarkers appear to perform in the research setting, their role in routine clinical practice is influenced by patient case mix, comorbidities, aetiology of AKI, timing of renal insult, timing of biomarker measurement and the selected thresholds for diagnosis. Furthermore, evidence that the use of novel biomarkers results in better patient outcomes is still lacking.
More work is necessary to identify those who benefit most from measuring either an individual biomarker or a panel of different markers. Finally, studies confirming that the use of biomarkers influences decision-making and improves outcomes are still awaited.
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Ostermann, M., Cruz, D., De Geus, H.H.R. (2015). Acute Kidney Injury Biomarkers. In: Oudemans-van Straaten, H., Forni, L., Groeneveld, A., Bagshaw, S., Joannidis, M. (eds) Acute Nephrology for the Critical Care Physician. Springer, Cham. https://doi.org/10.1007/978-3-319-17389-4_9
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DOI: https://doi.org/10.1007/978-3-319-17389-4_9
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