Effects of Almonds On Endothelial Function In Patients With Coronary Artery Disease

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: NCT01038362
Recruitment Status : Completed
First Posted : December 23, 2009
Last Update Posted : December 23, 2009
Tufts University
Information provided by:
Boston University

Brief Summary:

The vascular endothelium (inner lining of cells in blood vessels) normally prevents vasospasm and thrombosis by production of a variety of regulatory substances, including nitric oxide. In patients with atherosclerosis, these functions of the endothelium are impaired and these abnormalities may contribute to the development of heart attack and stroke.

Observational studies have shown that frequent nut consumption decreases the risk of cardiovascular disease (CVD), but the mechanisms of benefit have not been fully defined. Recent studies suggest that specific fatty acids and flavonoids in nuts may have favorable effects on cardiovascular disease. In addition, there is growing evidence that these compounds may improve the function of the endothelium.

The present study is designed to test the hypothesis that an almond-enriched diet will improve the function of the endothelium in patients with coronary artery disease. Subjects will be enrolled into a randomized, placebo-controlled, crossover study that will compare a National Cholesterol Education Program Step 1 diet without nuts to a Step 1 diet that has the same number of total calories but includes 3 ounces of almonds daily. Participants will consume each diet for six weeks with a four-week rest period between diets. The order of diets will be randomized (almonds or no almonds). Dietary assessments via food recall questionnaires will be employed at the study entry, end of the four week washout period, and end of the second intervention. If subjects are drifting from the recommendations of the STEP 1 diet, counseling will be given to urge compliance. The primary endpoint will be endothelium-dependent flow- mediated dilation assessed by ultrasound. Secondary study outcomes will include lipid profiles, markers of inflammation and oxidative stress. Enrollment will continue until 40 subjects with complete data are available.

Patients will be enrolled at Boston Medical Center and the Jean Mayer US Department of Agriculture Human Nutrition Research Center at Tufts Medical Center. Dietary interventions will be performed at Tufts Medical Center or by telephone. Ultrasound studies and blood collection will be performed in the principal investigator's research unit at Boston Medical Center.

Condition or disease Intervention/treatment Phase
Coronary Artery Disease Other: NCEP Step 1 diet plus Almonds Other: No Almonds Not Applicable

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 52 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)
Official Title: Effects Of Almonds On Vascular Reactivity And Biomarkers Of Inflammation, Oxidative Stress And Endothelial Function In Patients With Coronary Artery Disease
Study Start Date : April 2009
Actual Primary Completion Date : December 2009
Actual Study Completion Date : December 2009

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Active Comparator: Almonds
National Cholesterol Education Program Step I diet plus almonds for 6 weeks
Other: NCEP Step 1 diet plus Almonds
NCEP Step 1 Diet Plus Almonds 3 oz per day for 6 weeks

Placebo Comparator: No Almonds
National Cholesterol Education Program Step 1 diet without almonds for 6 weeks
Other: No Almonds
NCEP Step 1 diet without almonds

Primary Outcome Measures :
  1. Brachial artery flow-mediated dilation [ Time Frame: 6 weeks ]

Secondary Outcome Measures :
  1. Blood markers of inflammation, dyslipidemia, and oxidative stress [ Time Frame: 6 weeks ]

Information from the National Library of Medicine

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Ages Eligible for Study:   21 Years to 80 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  1. Male and Female subjects.
  2. Age range: 21-80 years old.
  3. Weight less than 115 kg.
  4. Clinically defined coronary artery disease that is clinical stable and compensated with appropriate treatment. Coronary disease (CVD) is defined by the presence of lesions on coronary angiography, history of myocardial infarction, or positive stress test.
  5. Willingness to give written informed consent and willingness and ability to understand, to participate to and to comply with the study requirements.

Exclusion Criteria:

  1. History of nut allergy.
  2. Pregnant or lactating women. Pregnancy will be excluded by urine pregnancy test.
  3. Clinical history of other major illness including end-stage cancer, renal failure, hepatic failure, gastrointestinal disorders that may impair absorption, or other conditions that in the opinion of the principal investigator make a clinical study inappropriate.
  4. Treatment with an investigational new drug within the last 30 days.
  5. History of a psychological illness or condition such as to interfere with the subject's ability to understand the requirements of the study.
  6. Unwillingness to comply with the requirements of study including refraining from consumption of nuts and refraining from use of Vitamin E, vitamin C, and beta carotene, lipoic acid, and/or other dietary or herbal supplements during the study.

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): NCT01038362

United States, Massachusetts
Boston Medical Center
Boston, Massachusetts, United States, 02118
Sponsors and Collaborators
Boston University
Tufts University
Principal Investigator: Joseph A Vita, MD Boston University

Responsible Party: Joseph A. Vita, MD, Boston University School of Medicine Identifier: NCT01038362     History of Changes
Other Study ID Numbers: H-27411
First Posted: December 23, 2009    Key Record Dates
Last Update Posted: December 23, 2009
Last Verified: December 2009

Keywords provided by Boston University:
dietary interventions
coronary artery disease

Additional relevant MeSH terms:
Coronary Artery Disease
Myocardial Ischemia
Coronary Disease
Heart Diseases
Cardiovascular Diseases
Arterial Occlusive Diseases
Vascular Diseases