Abstract
Background
Low serum levels of total 25-hydroxycholecalciferol (25(OH)D) occur in nephrotic syndrome (NS). We aimed to assess the effects of vitamin D3 and calcium supplementation on 25(OH)D levels, bone mineralization, and NS relapse rate in children with steroid-sensitive NS.
Methods
A randomized controlled trial (RCT) was performed in children with steroid-sensitive NS. The treatment group received vitamin D3 (60,000 IU orally, weekly for 4 weeks) and calcium supplements (500 to 1,000 mg/day for 3 months) after achieving NS remission. Blood samples for bone biochemistry were taken during relapse (T0), after 6 weeks (T1) and 6 months (T2) of randomization, whereas a lumbar DXA scan was performed at T0 and T2. Renal ultrasound was performed after study completion in the treatment group and in all patients with hypercalciuria.
Results
Of the 48 initial recruits, 43 patients completed the study. Post-intervention, 25(OH)D levels showed significant improvements in the treatment group compared with controls at T1 (p < 0.001) and T2 (p < 0.001). However, this was not associated with differences in bone mineral content (BMC) (p = 0.44) or bone mineral density (BMD) (p = 0.64) between the groups. Additionally, there was no reduction in relapse number in treated patients (p = 0.54). Documented hypercalciuria occurred in 52% of patients in the treatment group, but was not associated with nephrocalcinosis.
Conclusions
Although supplementation with calcium and vitamin D improved 25(OH)D levels significantly, there was no effect on BMC, BMD or relapse rate over a 6-month follow-up. Occurrence of hypercalciuria mandates caution and appropriate monitoring if using such therapy. Appropriate dosage of vitamin D3 remains uncertain and studies examining biologically active vitamin D may provide answers.
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Acknowledgements
We sincerely thank Dr Ravi Thadani, Chief of Nephrology, Massachusetts General Hospital, for reviewing the manuscript and Dr Subrata Das, H.O.D., Department of Radiology, Calcutta Medical Research Institute, for advice and supervision of the DXA scans.
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Contributions
Sushmita Banerjee and Jayati Sengupta reviewed and recruited patients, and Surupa Basu supervised biochemical assays. All three were involved in the study design and in manuscript writing. Ananda Sen reviewed and edited the manuscript and guided the statistical analysis.
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Ethics declarations
The study design was approved by the institutional ethics committees of the Institute of Child Health and Calcutta Medical Research Institute, and adhered to the Declaration of Helsinki. Informed consent was obtained from parents before recruitment.
Conflicts of interest
None of the authors involved have any conflicts of interest to declare.
Funding
The study was supported by an internal Institute of Child Health Nephrology Fund.
Additional information
Study design: randomized controlled open label intervention trial
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Banerjee, S., Basu, S., Sen, A. et al. The effect of vitamin D and calcium supplementation in pediatric steroid-sensitive nephrotic syndrome. Pediatr Nephrol 32, 2063–2070 (2017). https://doi.org/10.1007/s00467-017-3716-2
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DOI: https://doi.org/10.1007/s00467-017-3716-2