The Role of Cyclooxygenase Activity in the Endothelial Function of Hypertensive and Hypercholesterolemic Patients

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: NCT00001742
Recruitment Status : Completed
First Posted : December 10, 2002
Last Update Posted : March 4, 2008
Information provided by:
National Institutes of Health Clinical Center (CC)

Brief Summary:

A layer of cells called the endothelium line the walls of blood vessels. These cells produce substances that control the tone of blood vessels and thus control blood flow through the vessel. This regulating activity of the endothelium is dysfunctional in several diseases of the heart and blood vessels, including high blood pressure and high levels of cholesterol.

Previous research has pointed toward a decrease in the action of nitric oxide (NO) as the cause of this abnormality. Nitric oxide is a substance produced by the cells of the endothelium that plays a role in the relaxation of blood vessels.

In this project researchers plan to study blood flow through the blood vessels in patients forearms after receiving four different drugs: sodium nitroprusside, acetylcholine, L-NMMA, and aspirin. These four drugs act on the blood vessels of the forearm through different mechanisms. Acetylcholine and sodium nitroprusside are drugs that open the blood vessels of the forearm and increase blood flow through the vessel. L-NMMA is a drug that blocks production of nitric oxide (NO). Aspirin's role in controlling blood flow is unknown.

Patients participating in this research study will not directly benefit from it. However, the study will contribute to researchers understanding of diseases of the blood vessels and heart.

Condition or disease
Healthy Hypercholesterolemia Hypertension

Detailed Description:

The endothelium modulates vascular tone by the release of constricting and relaxing substances that act on the underlying smooth muscle. This regulatory activity of the endothelium is dysfunctional in a number of cardiovascular conditions, including essential hypertension and hypercholesterolemia. Previous studies from our group have implicated a decreased action of endothelium-derived nitric oxide (NO) as the mechanism responsible for this abnormality. Whether this reduced bioactivity of NO is related to vasoactive prostanoids remains uncertain.

We propose to test the hypothesis that an increased production of vasoactive prostanoids by the cyclooxygenase (COX) system is responsible for the reduced bioactivity of NO in essential hypertension and hypercholesterolemia. We will investigate the effect of COX inhibition by aspirin (ASA) on resting vascular tone, and on both endothelium-dependent and independent vasodilation in normal subjects, hypertensive patients, and hypercholesterolemic patients.

For this purpose, we propose to analyze the regional vascular responses to acetylcholine (ACH) and to sodium nitroprusside (SNP) before and after the administration of ASA. We will also analyze the basal forearm blood flow (FBF) responses to increasing doses of ASA infusion. We will employ infusion of drugs into the brachial artery and we will measure the responses of the forearm vasculature by means of strain gauge plethysmography.

Study Type : Observational
Enrollment : 75 participants
Official Title: The Role of Cyclooxygenase Activity in the Endothelial Function of Hypertensive and Hypercholesterolemic Patients
Study Start Date : February 1998
Study Completion Date : January 2001

Information from the National Library of Medicine

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Ages Eligible for Study:   Child, Adult, Older Adult
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Patients (men and nonpregnant women) with systemic hypertension and patients with hypercholesterolema will be included for this study.

Patient with aspirin allergies and those with a platelet count less than 50,000 will be excluded.

Volunteers cannot be in any kind of medication while participating in this study.

No history of diabetes, peripheral vascular disease, coagulopathy, or vasculitis.

Must be capable of rendering informed consent for all procedures.

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): NCT00001742

United States, Maryland
National Heart, Lung and Blood Institute (NHLBI)
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Heart, Lung, and Blood Institute (NHLBI)

Publications: Identifier: NCT00001742     History of Changes
Other Study ID Numbers: 980064
First Posted: December 10, 2002    Key Record Dates
Last Update Posted: March 4, 2008
Last Verified: January 2000

Keywords provided by National Institutes of Health Clinical Center (CC):
Nitric Oxide
Sodium Nitroprusside

Additional relevant MeSH terms:
Vascular Diseases
Cardiovascular Diseases
Lipid Metabolism Disorders
Metabolic Diseases