Abstract
Background Disturbances in vitamin D metabolism are common in patients with end-stage renal disease and may contribute to vascular dysfunction. Study Design Cross-sectional. Setting & Participants We evaluated 558 of 602 participants at baseline of the Hemodialysis Fistula Maturation (HFM) Study, a 7-center prospective cohort study of a cohort of patients with chronic kidney disease awaiting arteriovenous fistula (AVF) creation surgery. Factor 4 vitamin D metabolites measured with liquid chromatography–tandem mass spectroscopy from samples obtained within 4 weeks prior to AVF surgery. Outcomes Vasodilator functions and measurements of arterial stiffness. Measurements Trained HFM Study personnel measured brachial artery flow-mediated dilation, nitroglycerin-mediated dilation, and carotid-femoral and carotid-radial pulse wave velocities (PWVs) prior to AVF creation. We evaluated associations after basic adjustment for sex, age, and clinical site and more fully adjusted additionally for baseline education, smoking, body mass index, diabetes, dialysis status, and medication use. Results Mean participant age was 55 ± 13 (SD) years and 65% were receiving maintenance dialysis. None of the vitamin D metabolites were significantly associated with flow-mediated dilation, carotid-femoral PWV, or carotid-radial PWV in basic or fully adjusted analyses. Higher serum concentrations of bioavailable vitamin D and 1,25-dihydroxyvitamin D were associated with 0.62% and 0.58% greater nitroglycerin-mediated dilation values, respectively, in basic models; however, these associations were no longer statistically significant with full adjustment. There were no significant associations of vitamin D metabolites with carotid-femoral or carotid-radial PWV in fully adjusted analyses. Limitations Cross-sectional ascertainment of vitamin D metabolites and vascular functions late during the course of kidney disease. Conclusions Serum concentrations of vitamin D metabolites are not associated with vasodilator functions or vascular stiffness at baseline in a cohort study of patients with chronic kidney disease awaiting AVF creation surgery. Laboratory measurements of vitamin D metabolites are unlikely to provide useful information regarding vascular functions in this setting.
Original language | English |
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Pages (from-to) | 805-814 |
Number of pages | 10 |
Journal | American Journal of Kidney Diseases |
Volume | 69 |
Issue number | 6 |
DOIs | |
Publication status | Published - 1 Jun 2017 |
Funding
Support: The HFM Study is funded by the following grants from the National Institute of Diabetes and Digestive and Kidney Diseases: U01DK066597, U01DK082179, U01DK082189, U01DK082218, U01DK082222, U01DK082236, and U01DK082240. This ancillary study was funded by grant R01 DK094891 and by an unrestricted fund from the Northwest Kidney Centers and by the Niels Stensen Fellowship 2014. None of the funders of this study had any role in the collection, analysis, and interpretation of data for this study.
Funders | Funder number |
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National Institute of Diabetes and Digestive and Kidney Diseases | U01DK082179, U01DK082189, U01DK082222, R01 DK094891, U01DK082240, U01DK082218, U01DK066597, U01DK082236 |
Northwest Kidney Centers |
Keywords
- arterial function
- arteriovenous fistula (AVF)
- calcitriol
- end-stage renal disease (ESRD)
- endothelial function
- epidemiology
- flow mediated dilation (FMD)
- hemodialysis
- nitroglycerine-mediated dilation (NMD)
- pulse wave velocities (PWV)
- stiffness
- Vascular function
- vasodilation
- vitamin D metabolites