Effect of Coreg CR on BP, Endothelial Function, Exhaled Nitric Oxide, and Nitric Oxide Production and Oxidation

NCT00732511 Phase 4 UNKNOWN

We are comparing the blood pressure-lowering effects of two marketed medications, Coreg CR and Toprol XL. Although both drugs reduce blood pressure by blocking the action of noradrenaline on beta-receptors in the blood vessels, Coreg CR also blocks alpha-receptors, which may provide added blood pressure-lowering. In addition, Coreg CR may have anti-oxidant actions. Cells which line blood vessels (termed "endothelial cells") make nitric oxide (NO), which relaxes the muscle cells encircling the blood vessels, causing a reduction in blood pressure. When body cells use oxygen, they normally produce "free radicals", which can destroy NO,leading to high blood pressure, heart damage and worsenimg of diabetes. Antioxidants remove free radicals and prevent or repair this damage. In this study we will measure endothelial cell function, blood vessel wall stiffness, NO in exhaled breath, and blood levels of substances which reflect NO production and destruction to determine if a pure beta-blocker (Toprol XL) differs from an alpha/beta blocker (Coreg CR) in these effects. We will also examine the mechanism by which such differences might occur.

Details

Lead sponsor	State University of New York - Downstate Medical Center
Phase	Phase 4
Status	UNKNOWN
Enrolment	40
Start date	2008-04
Completion	2009-04

Conditions

• Endothelial Function
• Diabetes Mellitus
• Hypertension

Interventions

• carvedilol
• metoprolol extended release

Primary outcomes

• Effect of Coreg CR compared to Toprol XL on endothelial function, vascular compliance, and parameters of oxidative stress from time of randomization to study drug termination — 12 weeks

Countries

United States