Abstract
Background
Elevated serum uric acid concentration is a risk factor for CKD progression. Its change over time and association with CKD etiology and concomitant changes in estimated glomerular filtration rate (eGFR) in children and adolescents are unknown.
Methods
Longitudinal study of 153 children/adolescents with glomerular (G) and 540 with non-glomerular (NG) etiology from the CKD in Children (CKiD) study. Baseline serum uric acid, change in uric acid and eGFR over time, CKD etiology, and comorbidities were monitored. Adjusted linear mixed-effects regression models quantified the relationship between within-person changes in uric acid and concurrent within-person changes in eGFR.
Results
Participants with stable uric acid over follow-up had CKD progression which became worse for increased baseline uric acid (average annual percentage changes in eGFR were − 1.4%, − 7.7%, and − 14.7% in those with G CKD with baseline uric acid < 5.5 mg/dL, 5.5 − 7.5 mg/dL, and > 7.5 mg/dL, respectively; these changes were − 1.4%, − 4.1%, and − 8.6% in NG CKD). Each 1 mg/dL increase in uric acid over follow-up was independently associated with significant concomitant eGFR decreases of − 5.7% (95%CI − 8.4 to − 3.0%) (G) and − 5.1% (95%CI − 6.3 to − 4.0%) (NG) for those with baseline uric acid < 5.5 mg/dL and − 4.3% (95%CI − 6.8 to − 1.6%) (G) and − 3.3% (95%CI − 4.1 to − 2.6%) (NG) with baseline uric acid between 5.5 and 7.5 mg/dL.
Conclusions
Higher uric acid levels and increases in uric acid over time are risk factors for more severe progression of CKD in children and adolescents.
Graphical abstract
A higher resolution version of the Graphical abstract is available as Supplementary information.
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Acknowledgements
Data in this manuscript were collected by the Chronic Kidney Disease in children prospective cohort study (CKiD) with clinical coordinating centers (principal investigators) at Children’s Mercy Hospital and the University of Missouri—Kansas City (Bradley Warady, MD) and Children’s Hospital of Philadelphia (Susan Furth, MD, PhD), Central Biochemistry Laboratory (George Schwartz, MD) at the University of Rochester Medical Center, and data coordinating center (Alvaro Muñoz, PhD and Derek Ng, PhD) at the Johns Hopkins Bloomberg School of Public Health. The CKiD website is located at https://statepi.jhsph.edu/ckid and a list of CKiD site principal investigators can be found at https://statepi.jhsph.edu/ckid/site-investigators/. Please refer to the supplemental document which contains the list of the site principal investigators.
Funding
The CKiD Study is funded by the National Institute of Diabetes and Digestive and Kidney Diseases, with additional funding from the National Institute of Child Health and Human Development and the National Heart, Lung, and Blood Institute (U01-DK-66143, U01-DK66174, U24-DK-082194, U24-DK-66116).
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GJS: conceived and designed work, drafted and revised MS, and approved final version.
JLR: conducted the statistical analyses, drafted and revised MS, and approved final version.
SRH: revised MS and approved final version.
SLF: revised MS and approved final version.
DJW: revised MS and approved final version.
BAW: revised MS and approved final version.
MFS: designed work and conducted statistical analyses, drafted and revised MS, and approved final version.
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Schwartz, G.J., Roem, J.L., Hooper, S.R. et al. Longitudinal changes in uric acid concentration and their relationship with chronic kidney disease progression in children and adolescents. Pediatr Nephrol 38, 489–497 (2023). https://doi.org/10.1007/s00467-022-05620-3
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DOI: https://doi.org/10.1007/s00467-022-05620-3