Effects of Herbal Antioxidants on Cardiovascular Disease in Older Blacks

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00010725
Recruitment Status : Completed
First Posted : February 5, 2001
Last Update Posted : January 12, 2010
Information provided by:
National Center for Complementary and Integrative Health (NCCIH)

Brief Summary:
The purpose of this study is to compare an herbal supplement, nonfood-derived vitamins, and placebo for the care of cardiovascular disease in high risk older African Americans.

Condition or disease Intervention/treatment Phase
Cardiovascular Diseases Drug: MAK Drug: Vitamin Supplements Phase 2

Detailed Description:

Older African Americans suffer from disproportionately high rates of cardiovascular disease (CVD) morbidity and mortality. In response to the health disparity between older African Americans and whites, national mandates have called for new research on innovative approaches to CVD prevention in this high risk population. Oxidative stress has recently been implicated in the pathogenesis of atherosclerotic CVD. Available evidence from epidemiological studies, clinical trials, and laboratory mechanistic studies indicate that antioxidant interventions may be useful in the prevention and treatment of atherosclerotic CVD in high risk older populations. Furthermore, it has been hypothesized that dietary or food sources of antioxidant nutrients may be more clinically effective than conventional nonfood-derived vitamin supplementation. Surveys indicate relatively high rates of complementary and alternative medicine (CAM) use, including herbal medicines, in older African Americans. Yet, with the exception of the previous clinical trials of the present Center team, there have been few controlled studies on CAM therapies in older African Americans and no previous controlled studies on efficacy and mechanisms of herbal antioxidants for the prevention of CVD in this high risk population. Preliminary studies have found that a CAM herbal preparation (MAK) derived from traditional Vedic medicine demonstrates potent antioxidant and anti-atherogenic effects in laboratory and pilot human studies. This study will evaluate the effects of this traditional CAM herbal preparation in older African Americans.

This will be a controlled clinical trial at field site, Howard University Medical Center in Washington, DC, involving 138 older African American men and women (55 years of age and older) with documented atherosclerotic CVD who will be randomized to supplementation with either the traditional CAM herbal preparation (MAK 4+5), conventional vitamin cocktail (E+C) or placebo for 12 months. Clinical and mechanistic outcomes include carotid artery atherosclerosis (IMT), endothelial dysfunction (brachial artery reactivity), oxidized LDL, traditional CVD risk factors (BP, lipids, diet, exercise, smoking, weight) and quality of life. Participants will continue usual care. The results of this clinical study will provide much needed understanding of the basic and clinical effects of a traditional herbal antioxidant preparation on pathophysiological mechanisms of atherosclerotic CVD in this high risk group. This will facilitate translation of research findings on CAM into clinical practice for prevention of disease in this underserved and understudied population of high risk older African Americans.

Study Type : Interventional  (Clinical Trial)
Enrollment : 138 participants
Allocation: Randomized
Primary Purpose: Treatment
Official Title: Effects of Herbal Antioxidants on Cardiovascular Disease in Older Blacks
Study Start Date : September 1999
Actual Study Completion Date : August 2004

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Information from the National Library of Medicine

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Ages Eligible for Study:   60 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • African American (self-identified)
  • Atherosclerotic coronary heart disease (CHD)defined by documented clinical history of myocardial infarction, coronary revascularization procedure (CABG, PTCA), or coronary angiography demonstrating at least one coronary artery with >50% stenosis
  • High risk for CVD, defined as >=2 on Framingham/ATP III risk factor scale
  • Informed consent
  • Written permission of participant's referring physician

Information from the National Library of Medicine

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 identifier (NCT number): NCT00010725

United States, District of Columbia
Howard University Medical Center
Washington, Dc, District of Columbia, United States
United States, Iowa
Maharishi University of Management
Fairfield, Iowa, United States, 52557
Sponsors and Collaborators
National Center for Complementary and Integrative Health (NCCIH)
Principal Investigator: Robert H. Schneider Center for Health and Aging Studies Identifier: NCT00010725     History of Changes
Other Study ID Numbers: P50AT000082-01P3 ( U.S. NIH Grant/Contract )
P50AT000082-01 ( U.S. NIH Grant/Contract )
P50AT000082-02 ( U.S. NIH Grant/Contract )
First Posted: February 5, 2001    Key Record Dates
Last Update Posted: January 12, 2010
Last Verified: January 2010

Keywords provided by National Center for Complementary and Integrative Health (NCCIH):

Additional relevant MeSH terms:
Cardiovascular Diseases
Molecular Mechanisms of Pharmacological Action
Protective Agents
Physiological Effects of Drugs