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Endocrine

pp 1–12 | Cite as

Effect of 9 months of vitamin D supplementation on arterial stiffness and blood pressure in Graves’ disease: a randomized clinical trial

  • Diana Grove-LaugesenEmail author
  • Sofie Malmstroem
  • Eva Ebbehoj
  • Anne Lene Riis
  • Torquil Watt
  • Klavs Würgler Hansen
  • Lars Rejnmark
Original Article

Abstract

Purpose

Risk of cardiovascular disease (CVD) is increased in Graves’ disease (GD). CVD is predicted by increased pulse wave velocity (PWV) and blood pressure (BP). GD and these risk factors are all associated with lower levels of vitamin D. We aimed to assess the effect of supplemental vitamin D on PWV and BP in GD.

Methods

In a double-blinded trial, newly diagnosed GD patients were randomized to vitamin D3 70 µg/day (n = 44) or placebo (n = 42) as add-on to anti-thyroid medication. At baseline, 3 and 9 months PWV, BP and wave analysis were performed in office and 24 h setting. Between-group differences in change at 9 months were analyzed using linear mixed modelling. In subanalysis, effect of intervention in regard to baseline vitamin D insufficiency (25(OH)D < 50 nmol/L) was investigated. (The DAGMAR study, clinicaltrials.gov ID NCT02384668).

Results

PWV was unaffected by intervention in main analysis. However in the subanalysis, comparing the response to intervention in the vitamin D insufficient (n = 28) and the vitamin D replete patients, supplemental vitamin D induced a significant decrease in office PWV of 1.2 (95% CI: −2.3; −0.1) m/s compared to placebo. Of notice, baseline PWV was non-significantly higher among the vitamin D insufficient as compared to the replete participants. In response to vitamin D, office central systolic BP (−3.9 (95% CI: −7.5; −0.3) and brachial mean BP (−3.3 (95% CI: −6.5; −0.3) declined whereas 24 h measurements were unaffected.

Conclusions

High-dose vitamin D supplementation did not affect PWV. We observed significant reduction in office but not 24 h BP. Subanalysis showed a clinically relevant PWV reduction among vitamin D insufficient participants, although regression towards the mean might contribute to findings. Further studies on supplemental vitamin D in GD should focus on patients with vitamin D insufficiency.

Keywords

Graves’ disease Pulse wave analysis Blood pressure Arterial stiffness 

Notes

Acknowledgements

This study received funding from the Toyota Fonden and Orkla Health.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee (The Danish Biomedical Research Ethics Committee 1-10-72-568-12) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Supplementary material

12020_2019_1997_MOESM1_ESM.pdf (659 kb)
Supplementary information

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Endocrinology and Internal MedicineAarhus University HospitalAarhus NDenmark
  2. 2.Medical DepartmentRegional Hospital HorsensHorsensDenmark
  3. 3.Department of Internal MedicineGentofte and Herlev HospitalHerlevDenmark
  4. 4.Medical DepartmentSilkeborg Regional HospitalSilkeborgDenmark

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