Effect of Vitamin D3 Supplementation on Arterial and Bone Remodeling in Chronic Kidney Disease Patients
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|ClinicalTrials.gov Identifier: NCT02999204|
Recruitment Status : Active, not recruiting
First Posted : December 21, 2016
Last Update Posted : August 28, 2019
|Condition or disease||Intervention/treatment||Phase|
|Renal Insufficiency, Chronic Vascular Stiffness Bone Diseases, Metabolic||Drug: Vitamin D3||Phase 4|
Structural changes to large arteries and abnormalities in mineral and bone metabolism are frequent manifestations in patients with chronic kidney disease (CKD). Together, they contribute in a large part to the heightened morbidity and mortality observed in this population.
Epidemiological data in end stage renal disease and in the general population suggest the existence of a bone-vascular axis. Metabolic bone disease (MBD) in CKD encompasses altered bone remodeling and the propensity for vascular calcification. These pathological processes are driven by the multiple disorders of mineral metabolism in CKD, among them, abnormalities of vitamin D metabolism.
Vitamin D deficiency [25(OH)D] is widely observed in CKD patients and has been associated with an increased rate of cardiovascular events in both the general population and in CKD patients. The mechanisms involved are not clearly established. Vitamin D influences blood pressure through effects on the renin-angiotensin system (via a vitamin D response element in the renin gene), vascular smooth muscle cells and cardiomyocyte proliferation and hypertrophy, vascular inflammation and calcification. Vitamin D deficiency has been associated with large arterial stiffness in end-stage renal disease patients. Aortic and carotid stiffness are independent predictors of cardiovascular and overall mortality in end-stage renal disease patients. Large arterial remodeling and stiffening could be the missing pathogenic link between vitamin D deficiency and increased cardiovascular event rate.
In terms of mineral metabolism, many CKD patients develop secondary hyperparathyroidism. This results from a combination of hyperphosphatemia, hypocalcemia and low levels of active Vitamin D [1,25(OH)D2]. Since several observational studies have shown that parathyroid hormone (PTH) levels are inversely correlated with blood 25(OH)D levels, it is possible that 25(OH)D deficiency may also be contributing to the hyperparathyroid state. Secondary hyperparathyroidism contributes to cardiovascular risk and to bone disease. Elevated PTH has been associated with large arterial stiffness and remodeling. Elevated PTH is also associated with high bone turnover and participates in the development of bone disease of CKD-MBD. Bone disease in CKD-MBD comprises abnormalities in bone turnover, mineralization, linear growth and strength. Bone biopsy remains the gold standard for evaluation of bone disease in CKD but its invasive nature limits its practice. Serum biomarkers of bone remodeling allow direct estimation of bone remodeling but lack evaluation and precision. Among them, guidelines issued by Kidney Disease Improving Global Outcomes (KDIGO) recommend PTH (1-84) and bone specific alkaline phosphatase (BSALP). Other biomarkers exist including osteocalcin, osteoprotegerin, tartrate-resistant acid phosphate-5b (TRAP-5b), pyridinoline and deoxypyridinoline, procollagen type 1 amino-terminal extension peptides, C terminal cross-link (CTX) , FGF-23 and fetuin-A. The major limitation of the use of these biomarkers is their kidney-dependent elimination that affects their measured levels depending on the degree of kidney dysfunction. We have chosen to study, in addition to PTH (1-84) and BSALP, CTX, osteoprotegerin, osteocalcin, fetuin-A and fibroblast growth factor-23 (FGF-23) because a relationship between these biomarkers and arterial disease has never been demonstrated.
This study seeks to compare the impact of standard versus aggressive Vitamin D3 supplementation (in Vitamin D deficient CKD patients) on important vascular and bone health endpoints.
|Study Type :||Interventional (Clinical Trial)|
|Estimated Enrollment :||80 participants|
|Intervention Model:||Parallel Assignment|
|Masking:||Double (Participant, Care Provider)|
|Official Title:||Effect of Vitamin D3 Supplementation on Arterial and Bone Remodeling in Chronic Kidney Disease Patients|
|Actual Study Start Date :||January 2015|
|Estimated Primary Completion Date :||January 2020|
|Estimated Study Completion Date :||January 2020|
Active Comparator: Vitamin D3 5,000 units per week
Patient receive a dose that is considered within the standard dosing range for Vitamin D3 for one year.
Drug: Vitamin D3
Two different doses of Vitamin D3
Other Name: cholecalciferol
Experimental: Vitamin D3 50,000 units per week
Patients receive a more aggressive Vitamin D3 dosing regimen of 50,000 units weekly for the first 3 months. At this point Vitamin D3 levels are measured. If the patient is Vitamin D3 replete (>75 nmol/L) then the dose is reduced to the equivalent of 25,000 units per week for the next 9 months. If the level is below this threshold then 50,000 units per week is continued for the next 9 months
Drug: Vitamin D3
Two different doses of Vitamin D3
Other Name: cholecalciferol
- Aortic stiffness evaluated by pulse wave velocity (PWV) (Sphygmocor ® ) [ Time Frame: 12 months ]Parameter measured in meters per second.
- Carotid stiffness evaluated by high resolution echotracking system (Art-lab®). [ Time Frame: 12 months ]Parameter measured as the difference in millimeters in carotid artery diameter between systole and diastole.
- Endothelial function evaluated by Endo-PAT2000® system [ Time Frame: 12 months ]Parameter measured as the reactive hyperemia index as calculated by the Endo-PAT2000® system software.
- Aortic valve calcification obtained from echocardiography. [ Time Frame: 12 months ]
Parameter measured using a semi-quantitative scoring system based on scale of 1-4 as described by Rosenhek et al, New England Journal of Medicine 2000;343 (9):611.
1-no calcification, 2-mildly calcified (small isolated spots), 3-moderately calcified (multiple larger spots), 4-heavily calcified (extensive thickening and calcification of all cusps).
- Calcification of the aorta obtained by plain lateral radiography. [ Time Frame: 12 months ]
Parameter measured using a semi-quantitative scoring system based on a scale of 0-3 as described by Kauppila et al, Atherosclerosis 1997;132:245.
0-no calcification, 1-small scattered calcific deposits filling less than 1/3 of the longitudinal wall of the aorta, 2-one third or more, but less than two thirds of the longitudinal wall of the aorta calcified, 3-two thirds or more of the longitudinal wall of the aorta calcified.
- Bone mineral density [ Time Frame: 12 months ]Osteodensitometry of the lumbar spine, hip, and distal radius, using dual-energy X-ray absorptiometry and reported in grams per square centimeter.
- Parathyroid hormone levels [ Time Frame: 12 months ]Measurement of parathyroid hormone levels using a commercially available intact parathyroid hormone ELISA kit with values reported in ng/L.
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02999204
|Jewish General Hospital|
|Montreal, Quebec, Canada, H3T1E2|
|Principal Investigator:||Mark L Lipman, M.D.||Jewish General Hospital|