Abstract
Vitamin D deficiency is frequent in pediatric nephrology. The 2017 European guidelines recommend keeping 25OH vitamin D (25-D) levels within the 75–120 nmol/L range, ideally with daily supplementation. Intermittent supplementation with D3 has also been proposed. We aimed to assess the influence of our local protocol of intermittent vitamin D supplementation on the evolution of 25-D levels between baseline and 2 months. VITATOL is a prospective single-center study performed in our tertiary unit in children and teenagers followed for chronic kidney disease (CKD), kidney transplantation, or stable chronic nephrotic syndrome with 25-D levels below 75 nmol/L. Intermittent oral cholecalciferol (100,000 IU) was administered depending on baseline vitamin D levels and body weight. The primary outcome was the change in 25-D levels between baseline and 2 months. Secondary outcomes were the evolution of the main mineral biomarkers. Thirty-seven patients were included. Two months after beginning supplementation, corresponding to a median(min-max) of 46 (14–79) days after the last dose of vitamin D, 25-D levels increased from 50 to 76 nmol/L (p < 0.001), 18 patients having 25-D levels within the target range and 2 above. All patients displayed 25-D levels above 50 nmol/L. There were no significant changes in phosphate, PTH, alkaline phosphatase, and FGF23 levels before and after supplementation. Calcium levels increased from 2.39 to 2.44 mmol/L (p = 0.017), but no differences in calciuria and urinary calcium/creatinine ratio were observed.
Conclusion: This vitamin D supplementation protocol using intermittent moderate doses of cholecalciferol seems efficient in 54% of cases, with neither significant overdose nor hypercalciuria.
What is Known: • Vitamin D deficiency is frequent in pediatric nephrology. • The 2017 European guidelines recommend keeping 25OH vitamin D levels within the 75–120 nmol/L range ideally with daily supplementation, but intermittent supplementation with D3 has also been proposed. What is New: • We assessed the influence of a local protocol of intermittent vitamin D supplementation on the evolution of 25-D levels between baseline and 2 months in children and teenagers followed in pediatric nephrology. • The intermittent cholecalciferol supplementation protocol seems efficient in 54% of cases, with neither significant overdose nor hypercalciuria. |
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Abbreviations
- ALP:
-
Alkaline phosphatase
- UCa/creat:
-
Urinary calcium/creatinine ratio
- CKD:
-
Chronic kidney disease
- eGFR:
-
Estimated glomerular filtration rate
- ESPN:
-
European Society of Pediatric Nephrology
- FGF23:
-
Fibroblast growth factor 23
- IRB:
-
Institutional Review Board
- IU:
-
International unit
- KDIGO:
-
Kidney disease improving global outcomes
- KDOQI:
-
Kidney disease outcomes quality
- PTH:
-
Parathormone
- RCTs:
-
Randomized clinical trials
- SDS:
-
Standard deviation scores
- 25-D:
-
25hydroxy vitamin D
- 1-25-D:
-
1-25 di-hydroxy vitamin D
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Acknowledgements
The authors would like to thank patients and their families for accepting to be part of the VITATOL study. They also would like to acknowledge Mrs. Tiphanie Ginhoux, project manager in EPICIME, for her technical help with the administrative duties, and Dr. Marie-Christine Carlier (PharmD, Hospices Civils de Lyon) for her help in biochemical assessment.
Funding
This study was supported by the Crinex laboratories, with a research grant of 3000 euros for biochemical markers assessment and the centralized delivery of cholecalciferol doses.
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Contributions
MA analyzed data and wrote the first draft of the manuscript.
OB, BR, ALSL, and ABT included patients and revised the manuscript.
BKK was involved in the study design and revised the manuscript.
JB designed the study, included patients, analyzed date and revised the manuscript.
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Conflict of interest
This study was supported by the Crinex laboratories, with a research grant for biochemical markers assessment and the centralized delivery of cholecalciferol doses. The Crinex laboratories were not involved neither in the design and conduct of the study nor in data analysis.
Ethical approval
VITATOL was approved by the local IRB (Comité de Protection des Personnes Lyon Sud Est IV, session A13–329).
Informed consent
Informed consent was obtained from all individual participants included in the study.
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Communicated by Mario Bianchetti
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Aurelle, M., Basmaison, O., Ranchin, B. et al. Intermittent cholecalciferol supplementation in children and teenagers followed in pediatric nephrology: data from a prospective single-center single-arm open trial. Eur J Pediatr 179, 661–669 (2020). https://doi.org/10.1007/s00431-019-03553-y
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DOI: https://doi.org/10.1007/s00431-019-03553-y