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Sponsored by: |
National Heart, Lung, and Blood Institute (NHLBI) |
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Information provided by: | National Institutes of Health Clinical Center (CC) |
ClinicalTrials.gov Identifier: | NCT00001889 |
This study is designed to compare two different echocardiographic techniques in the evaluation of heart disease (coronary artery disease). Both tests called Myocardial Contrast Echocardiography with Pharmacologic Stress and Stress Echocardiography with Dobutamine, are performed using a standard echocardiographic machine.
Myocardial Contrast Echocardiography (MCE) does not use radioactivity. It uses sound waves like standard echocardiography. However, with MCE patients receive an injection of a "contrast agent" directly into the blood stream through a vein. The contrast agent, called Optison, is made of tiny microbubbles smaller than red blood cells. The echocardiogram can detect these microbubbles in the small blood vessels of the heart muscle and allow researchers to find areas of the heart receiving less blood flow than others. It is important to observe the heart during exercise because there are changes in blood flow. Since MCE cannot be performed when the patient is exercising, researchers give medication (adenosine) that stimulates the heart and creates a situation similar to exercise.
Stress Echocardiography with Dobutamine does not use radioactivity. It uses sound waves like standard echocardiography. During this echocardiogram patients receive doses of a medication called dobutamine that stimulates the heart to beat stronger and faster.
The purpose of this study is to evaluate the accuracy of MCE compared to stress echocardiography at detecting coronary artery disease (CAD).
Condition | Intervention | Phase |
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Coronary Disease |
Procedure: Myocardial contrast echocardiography Procedure: Stress echocardiography with dobutamine |
Phase II |
Study Type: | Interventional |
Study Design: | Treatment, Safety/Efficacy Study |
Official Title: | Comparison of Myocardial Contrast Echo With Dobutamine Echo in Diagnosis of Coronary Artery Disease |
Estimated Enrollment: | 150 |
Study Start Date: | March 1999 |
Estimated Study Completion Date: | March 2001 |
Stress echocardiography has become a valuable technique for the non-invasive detection of coronary artery disease (CAD). Its accuracy has been shown to be superior to that of the exercise electrocardiogram and comparable to that of myocardial perfusion imaging. Myocardial contrast echocardiography (MCE) offers the potential to evaluate tissue perfusion at the level where oxygen transfer to the myocytes occurs. MCE can, therefore, provide information regarding the functional status of the myocardial microvasculature and presence of blood flow disparity. The purpose of this study is to evaluate the accuracy of MCE compared to stress echocardiography. We will correlate these results with findings from coronary angiography and compare the ability of those techniques to detect CAD.
Genders Eligible for Study: | Both |
Accepts Healthy Volunteers: | No |
Patients with known or suspected coronary artery disease.
Adults 18 years of age or older.
No pre-menopausal patients who are lactating, pregnant or potentially pregnant as judged by history, physical examination, ultrasound or urine pregnancy test.
No unstable angina patients.
No recent myocardial infarction patients (less than 1 month).
No frequent ectopy which precludes adequate image acquisition.
No history of asthma or chronic obstructive pulmonary disease.
No patients receiving aminophylline, theophylline or dipyridamole.
No presence of second and third degree heart block without pacemaker.
No significant hypertension (systolic blood pressure greater than 170 mm Hg) or hypotension (systolic blood pressure less than 100 mm Hg).
No hypotension: basal sitting systolic arterial pressure less than 100 mm Hg confirmed 30 minutes later.
No sinus tachycardia greater than or equal to 100 beats per min.
No atrial fibrillation.
No inadequate two-dimensional echocardiographic windows.
Study ID Numbers: | 990077, 99-H-0077 |
Study First Received: | November 3, 1999 |
Last Updated: | March 3, 2008 |
ClinicalTrials.gov Identifier: | NCT00001889 |
Health Authority: | United States: Federal Government |
Microbubbles Myocardial Blood Flow Myocardial Ischemia |
Second Harmonics Ultrasound Coronary Artery Disease |
Arterial Occlusive Diseases Coronary Disease Heart Diseases Myocardial Ischemia Vascular Diseases |
Arteriosclerosis Ischemia Dobutamine Coronary Artery Disease |
Neurotransmitter Agents Molecular Mechanisms of Pharmacological Action Adrenergic beta-Agonists Adrenergic Agents Cardiotonic Agents Sympathomimetics Physiological Effects of Drugs Cardiovascular Agents |
Protective Agents Pharmacologic Actions Adrenergic Agonists Autonomic Agents Therapeutic Uses Cardiovascular Diseases Peripheral Nervous System Agents |