Vitamin D Supplementation for Treatment of Heart Failure

Status Terminated

Clinical Trial Summary

The central objective of this proposal is to establish that vitamin D supplementation in heart failure patients with low vitamin D levels will have improved outcomes compared to placebo. In addition the investigators will also evaluate the role of genetics in regard to vitamin D and heart failure. The investigators will be evaluating what is currently a novel approach of identifying patients with low vitamin D and treating this low vitamin D level. The investigators will be able to evaluate the importance of vitamin D supplementation in these patients and the role of genetics on our defined outcomes.

Clinical Trial Description

Primary Objective To determine how rapid vitamin D supplementation affects biomarkers and submaximal exercise capacity in systolic HF patients with low vitamin D status.

Working Hypothesis 1: HF patients when supplemented with vitamin D for 6 months will have lower measures of inflammation and extracellular-matrix remodeling compared with placebo.

Working Hypothesis 2: HF patients when supplemented with vitamin D for 6 months will have longer 6-minute walk length compared with placebo.

Secondary Objectives To establish a relationship between the CYP2R1 variant and surrogate markers in systolic HF patients.

Working Hypothesis 3: HF patients with the CYP2R1 G allele will have higher measures of inflammation and extracellular-matrix remodeling compared to AA subjects. This relationship will also be seen in subjects with the CYP2R1 TagSNP variants.

Working Hypothesis 4: HF patients with CYP2R1 variant alleles will have shorter 6-minute walk length compared to subjects without these variants.

To genotype HF subjects for the VDR variants and additional tag SNPs, to ascertain the relationship between VDR genetic variation and surrogate markers in systolic HF patients.

Working Hypothesis 5: HF patients with VDR variants will have greater measures of inflammation and extracellular-matrix remodeling compared to subjects without VDR variants.

Working Hypothesis 6: HF patients with VDR variants will have a shorter 6-minute walk length compared to subjects without these variants. ;

Study Design

Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver), Primary Purpose: Treatment

Related Conditions & MeSH terms

Heart Failure

Clinical Trial Details

NCT number	NCT01230307
Study type	Interventional
Source	University of Michigan
Contact
Status	Terminated
Phase	Phase 4
Start date	October 2010
Completion date	December 2014

View Details

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Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.

Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.

Vitamin D Supplementation for Treatment of Heart Failure — DELIGHTFUL

Clinical Trial Summary

Clinical Trial Description

Study Design

Related Conditions & MeSH terms