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Vitamin D in incident nephrotic syndrome: a Midwest Pediatric Nephrology Consortium study

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Abstract

Background

Cross-sectional studies of children with prevalent nephrotic syndrome (NS) have shown 25-vitamin D (25(OH)D) deficiency rates of 20–100 %. Information on 25(OH)D status in incident patients or following remission is limited. This study aimed to assess 25(OH)D status of incident idiopathic NS children at presentation and longitudinally with short-term observation.

Methods

Multicenter longitudinal study of children (2–18 years old) from 14 centers across the Midwest Pediatric Nephrology Consortium with incident idiopathic NS. 25(OH)D levels were assessed at diagnosis and 3 months later.

Results

Sixty-one children, median age 5 (3, 11) years, completed baseline visit and 51 completed second visit labs. All 61 (100 %) had 25(OH)D < 20 ng/ml at diagnosis. Twenty-seven (53 %) had 25(OH)D < 20 ng/ml at follow-up. Fourteen (28 %) children were steroid resistant. Univariate analysis showed that children prescribed vitamin D supplements were less likely to have 25(OH)D deficiency at follow-up (OR 0.2, 95 % CI 0.04, 0.6). Steroid response, age, and season did not predict 25(OH)D deficiency. Multivariable linear regression modeling showed higher 25(OH)D levels at follow-up by 13.2 ng/ml (SE 4.6, p < 0.01) in children supplemented with vitamin D.

Conclusions

In this incident idiopathic NS cohort, all children at diagnosis had 25(OH)D deficiency and the majority continued to have a deficiency at 2–4 months. Supplemental vitamin D decreased the odds of 25(OH)D deficiency at follow-up, supporting a role for supplementation in incident NS.

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Acknowledgments

The investigators are indebted to the children and families who graciously participated in this study. This work was supported by a grant from the Renal Research Institute. M.E.S. was supported by the Washington University Institute of Clinical and Translational Sciences grants UL1 TR000448 and KL2 TR000450 from NIH/NCATS, and L40 DK099748 from NIH/NIDDK. The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH.

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The author(s) declare that they have no competing interests.

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Correspondence to David T. Selewski.

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Each site obtained individual institutional IRB approval. Parents and children gave informed consent and assent respectively.

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Selewski, D.T., Chen, A., Shatat, I.F. et al. Vitamin D in incident nephrotic syndrome: a Midwest Pediatric Nephrology Consortium study. Pediatr Nephrol 31, 465–472 (2016). https://doi.org/10.1007/s00467-015-3236-x

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  • DOI: https://doi.org/10.1007/s00467-015-3236-x

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