Vitamin D, Cardiovascular Disease, and African Americans

NCT ID: NCT01655810

Last Updated: 2020-06-05

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

86 participants

Study Classification

INTERVENTIONAL

Study Start Date

2012-08-13

Study Completion Date

2018-02-09

Brief Summary

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African-Americans have higher rates of cardiovascular disease morbidity and mortality, as well as vitamin D deficiency. Multiple observational studies have demonstrated an increased risk of vitamin D deficiency in African Americans with type 2 diabetes and correlation between cardiovascular disease and vitamin D levels; however, there is a lack of interventional trials exploring this connection. The objective of this proposal is to address the hypothesis that treatment of vitamin D deficiency in African Americans with type 2 diabetes will improve subclinical markers of cardiovascular disease.

Detailed Description

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This study will be a double blinded, randomized controlled trial of vitamin D3 supplementation, 4,000 international units per day versus 600 international units per day, for one year to determine the effects on markers of subclinical cardiovascular disease in African Americans with type 2 diabetes and vitamin D deficiency. Outcome assessment will focus on changes in carotid intima-medial thickness (CIMT - ultrasound of the thickness of blood vessels in the neck), as well as markers of systemic inflammation.

Conditions

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Vitamin D Deficiency Type 2 Diabetes Mellitus Cardiovascular Disease

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

TREATMENT

Blinding Strategy

QUADRUPLE

Participants Caregivers Investigators Outcome Assessors

Study Groups

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Vitamin D 4000 IU

PO daily

Group Type ACTIVE_COMPARATOR

Vitamin D3

Intervention Type DIETARY_SUPPLEMENT

Multivitamin containing cholecalciferol 4000 units orally daily

Calcium carbonate

Intervention Type DIETARY_SUPPLEMENT

500 mg orally twice daily

Vitamin D 600 IU

PO daily

Group Type ACTIVE_COMPARATOR

Vitamin D3

Intervention Type DIETARY_SUPPLEMENT

Multivitamin containing cholecalciferol 600 units orally daily

Calcium carbonate

Intervention Type DIETARY_SUPPLEMENT

500 mg orally twice daily

Interventions

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Vitamin D3

Multivitamin containing cholecalciferol 4000 units orally daily

Intervention Type DIETARY_SUPPLEMENT

Vitamin D3

Multivitamin containing cholecalciferol 600 units orally daily

Intervention Type DIETARY_SUPPLEMENT

Calcium carbonate

500 mg orally twice daily

Intervention Type DIETARY_SUPPLEMENT

Other Intervention Names

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Cholecalciferol Cholecalciferol

Eligibility Criteria

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Inclusion Criteria

* African Americans of both genders
* Age 50-70 years
* Type 2 diabetes (A1C \< 9.0%), on stable therapy with oral medications, insulin, or a combination
* 25(OH)D level \< 20 ng/ml
* BP \< 140/90 mmHg; LDL \< 140 mg/dl

Exclusion Criteria

* Pregnancy
* Cardiovascular disease
* Stage 3 or worse chronic kidney disease
* High urine or serum calcium or history of recurrent kidney stones
* Unstable medical conditions or major systemic diseases such as malignancy
Minimum Eligible Age

50 Years

Maximum Eligible Age

70 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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American Diabetes Association

OTHER

Sponsor Role collaborator

Washington University School of Medicine

OTHER

Sponsor Role lead

Responsible Party

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Responsibility Role SPONSOR

Principal Investigators

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Carlos Bernal-Mizrachi, MD

Role: PRINCIPAL_INVESTIGATOR

Washington University School of Medicine

Locations

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Washington University

St Louis, Missouri, United States

Site Status

Countries

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United States

Other Identifiers

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201102160

Identifier Type: -

Identifier Source: org_study_id

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