Abstract
Background
Uric acid (UA) is associated with high blood pressure in adolescents and with left ventricular hypertrophy (LVH) and cardiovascular disease (CVD) in adults. We sought to determine if UA is independently associated with CVD risk factors and left ventricular mass (LVM) over time in hypertensive youth.
Methods
This was a 1-year prospective observational study of hypertensive children aged 3–19 years. Cross-sectional and longitudinal associations of serum UA with CVD risk factors and LVM were explored.
Results
Of the 49 children who completed both the baseline and 12-month assessments, at baseline the mean age was 13.8 years and mean UA was 5.5 mg/dL; 24 % had elevated UA, 51 % were overweight/obese and 39 % had LVH. Measures of adiposity, low high-density lipoprotein cholesterol, high-sensitivity C-reactive protein, LVM and LVH were all significantly associated with elevated UA at baseline, but not with change over time. Each 1 mg/dL increase in baseline UA was associated with a 2.5 g/m2.7 increase in the LVM index at follow-up (95 % confidence interval 0.64, 4.39; p = 0.01); after adjustment for age, sex, race, body mass index z-score, change in UA, time, blood pressure and medication use, this association was no longer significant.
Conclusions
Hypertensive children with elevated UA have a higher prevalence of obesity-related CVD risk factors. Among hypertensive children, UA may be a marker of adiposity and not an independent CVD risk factor.
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Acknowledgments
This study is supported by grants from by the American Society of Nephrology, National Kidney Foundation of MD, American Heart Association, Thomas Wilson Sanitarium for Children of Baltimore City, the National Heart, Lung, and Blood Institute of the National Institutes of Health under Award Number K23HL119622. It was also made possible by Grant Number UL1 RR 025005 from the National Center for Research Resources (NCRR), a component of the National Institutes of Health (NIH), and NIH Roadmap for Medical Research. Its contents are solely the responsibility of the authors and do not necessarily represent the official view of the NCRR or NIH.
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The authors declare that they have no conflict of interest.
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Reschke, L.D., Miller, E.R., Fadrowski, J.J. et al. Elevated uric acid and obesity-related cardiovascular disease risk factors among hypertensive youth. Pediatr Nephrol 30, 2169–2176 (2015). https://doi.org/10.1007/s00467-015-3154-y
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DOI: https://doi.org/10.1007/s00467-015-3154-y