Abstract
Background
During the first postnatal weeks, infants have abrupt changes in fluid weight that alter serum creatinine (SCr) concentration, and possibly, the evaluation for acute kidney injury (AKI).
Methods
We performed a prospective study on 122 premature infants to determine how fluid adjustment (FA) to SCr alters the incidence of AKI, demographics, outcomes, and performance of candidate urine biomarkers. FA-SCr values were estimated using changes in total body water (TBW) from birth; FA-SCR = SCr × [TBW + (current wt. – BW)]/ TBW; where TBW = 0.8 × wt in kg). SCr-AKI and FA-SCr AKI were defined if values increased by ≥ 0.3 mg/dl from previous lowest value.
Results
AKI incidence was lower using the FA-SCr vs. SCr definition [(23/122 (18.8 %) vs. (34/122 (27.9 %); p < 0.05)], with concordance in 105/122 (86 %) and discordance in 17/122 (14 %). Discordant subjects tended to have similar demographics and outcomes to those who were negative by both definitions. Candidate urine AKI biomarkers performed better under the FA-SCr than SCr definition, especially on day 4 and days 12–14.
Conclusions
Adjusting SCr for acute change in fluid weight may help differentiate SCr rise from true change in renal function from acute concentration due to abrupt weight change.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the Institutional Review Board at the University of Alabama at Birmingham, as well all with the 1964 Declaration of Helsinki and its later amendments.
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Informed parental consent was obtained for all individual participants included in the study.
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Research reported in this publication was supported by the Norman Siegel Career Development Award from the American Society of Nephrology. Dr. Askenazi receives funding from the NIH (R01 DK13608-01) and the Pediatric and Infant Center for Acute Nephrology (PICAN), which is sponsored by Children’s of Alabama and the University of Alabama at Birmingham’s School of Medicine, Department of Pediatrics and Center for Clinical and Translational Science (CCTS) under award number UL1TR00165. Dr. Ambalavanan receives funding from NIH (grant # U01 HL122626; R01 HD067126; R01 HD066982; U10 HD34216). Dr. Griffin receives funding from UAB CCTS, and PICAN.
Conflict of interest
Dr. Askenazi is a speaker for The Acute Kidney Injury Foundation.
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Askenazi, D., Saeidi, B., Koralkar, R. et al. Acute changes in fluid status affect the incidence, associative clinical outcomes, and urine biomarker performance in premature infants with acute kidney injury. Pediatr Nephrol 31, 843–851 (2016). https://doi.org/10.1007/s00467-015-3258-4
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DOI: https://doi.org/10.1007/s00467-015-3258-4