PET Scan to Determine Areas of Blood Flow and Activity in the Hearts of Patients With Heart Disease Taking Beta-Blockers

NCT00001402 | Completed Phase 2

• 2 other identifiers: 94005494-H-0054
• Study Type: interventional
• Target: 130
• Locations: 1 country
• Sites: 1

Brief Summary

The human heart is divided into four chambers. One of the four chambers, the left ventricle, is the chamber mainly responsible for pumping blood out of the heart into the circulation. Diseases of the heart like congestive heart failure (CHF), can cause the left ventricle to function improperly. Medications called beta-blockers appear to reverse the abnormalities in the left ventricle and frequently improve the function of the left ventricle in patients with different kinds of heart disease. How beta-blockers improve left ventricle function is unknown. One possible reason for improved function of the left ventricle with beta-blockers is improved blood flow to the heart muscle. When a region of the heart is active, it uses more fuel in the form of oxygen and sugar (glucose). As heart activity increases, blood flow to and from the area of activity increases also. Knowing these facts, researchers can use radioactive sugar (glucose) and positron emission tomography (PET) scans to observe what areas of the heart are receiving more blood flow. In this study researchers plan to measure glucose use in heart muscle and blood flow to the heart muscle in patients with CHF taking beta-blockers.

Conditions

Heart Failure, Congestive

Keywords

Dilated Cardiomyopathy; Hibernating Myocardium; Ischemic Cardiomyopathy; Metoprolol; Stress Thallium Scintigraphy; Congestive Cardiomyopathy; Congestive Heart Failure; Heart Failure

Interventions

PET scan DEVICE

Eligibility Criteria

• Sex: all
• Healthy Volunteers: No
• Age Groups: Child (0-17), Adult (18-64), Older Adult (65+)

Left ventricular ejection fraction by radionuclide angiography of less than or equal to 40%. New York Heart Association class II, III or IV symptoms on standard heart failure medications which my include digoxin, diuretics and angiotensin converting enzyme inhibitors for at least one month prior to enrollment. Ischemic cardiomyopathy if enzymes document an MI or 70% or greater stenosis in one major vessel. Dilated cardiomyopathy-if no coronary disease. No pregnant or lactating women. No women of child-bearing age not on proven birth control. No severe hepatic or renal disease. No diabetes mellitus or fasting glucose greater than or equal to 120 mg/dl. No primary valvular heart disease. No PTCA or CABG within 3 months of enrollment. No history of myocardial infarction or unstable angina within past 2 months. No resting heart rate less than 60 bpm. No A-V block greater than 1 degree block without pacemaker. No severe ETOH abuse within 6 months of enrollment. No severe bronchospasm.

Contact the study team to discuss eligibility requirements. They can help determine if this study is right for you.

Sponsors & Collaborators

• National Heart, Lung, and Blood Institute (NHLBI): lead

Study Sites (1)

National Heart, Lung and Blood Institute (NHLBI)

Bethesda, Maryland, 20892, United States

Location

Related Publications (2)

• Eichhorn EJ, Heesch CM, Barnett JH, Alvarez LG, Fass SM, Grayburn PA, Hatfield BA, Marcoux LG, Malloy CR. Effect of metoprolol on myocardial function and energetics in patients with nonischemic dilated cardiomyopathy: a randomized, double-blind, placebo-controlled study. J Am Coll Cardiol. 1994 Nov 1;24(5):1310-20. doi: 10.1016/0735-1097(94)90114-7.

  PMID: 7930255 BACKGROUND

• Kjekshus JK, Mjos OD. Effect of free fatty acids on myocardial function and metabolism in the ischemic dog heart. J Clin Invest. 1972 Jul;51(7):1767-76. doi: 10.1172/JCI106978.

  PMID: 5032525 BACKGROUND

MeSH Terms

Conditions

Heart Failure; Cardiomyopathy, Dilated

Interventions

Positron-Emission Tomography

Condition Hierarchy (Ancestors)

Heart Diseases; Cardiovascular Diseases; Cardiomegaly; Cardiomyopathies; Laminopathies; Genetic Diseases, Inborn; Congenital, Hereditary, and Neonatal Diseases and Abnormalities

Intervention Hierarchy (Ancestors)

Tomography, Emission-Computed; Image Interpretation, Computer-Assisted; Diagnostic Imaging; Diagnostic Techniques and Procedures; Diagnosis; Image Enhancement; Photography; Radionuclide Imaging; Tomography; Diagnostic Techniques, Radioisotope

Study Design

• Study Type: interventional
• Phase: phase 2
• Purpose: TREATMENT
• Sponsor Type: NIH

Study Record Dates

• First Submitted: November 3, 1999
• First Posted: December 10, 2002
• Study Start: January 1, 1994
• Study Completion: March 1, 2001
• Last Updated: March 4, 2008

Record last verified: 1999-12

Locations

US (1)