Beta-blocker Effect on Structural Remodeling and Gene Expression in the Failing Human Heart
Overview
- Phase
- Phase 4
- Intervention
- Metoprolol succinate
- Conditions
- Idiopathic Dilated Cardiomyopathy
- Sponsor
- University of Colorado, Denver
- Enrollment
- 56
- Locations
- 2
- Primary Endpoint
- Improvement in Left Ventricular Ejection Fraction (LVEF) at 12 Months
- Status
- Completed
- Last Updated
- 2 years ago
Overview
Brief Summary
The primary goal of the study is to measure in the intact human heart, the alterations in gene expression over time that are associated with reverse remodeling in response to β-blockade. The second goal is to investigate the signaling mechanisms which in turn are responsible for these changes in gene expression, and the third goal is to determine the relationship between intrinsic systolic dysfunction and remodeling of the left ventricle. This will be accomplished by measuring ventricular size, function, and gene expression in myocardial tissue samples obtained by percutaneous biopsy prior to initiation of β-blockade and at 3 and 12 months after start of therapy. The specific Aims and Hypotheses to be tested are:
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Aim: Determine the changes in gene expression associated with changes in intrinsic systolic function and with functional decompensation in the intact, failing human heart.
a. Hypothesis: Changes in the expression of select genes precede or accompany changes in left ventricular systolic function in humans with idiopathic dilated cardiomyopathy (IDC).
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Aim: Identify signaling mechanisms responsible for alterations in expression of key genes involved in mediation of ventricular hypertrophy or contractile dysfunction.
a. Hypothesis: Myocardial-failure-associated regulation of select messenger ribonucleic acids and proteins are related to left ventricular wall stress and neurohormonal signaling.
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Aim: In the relationship between contractile dysfunction and dilatation/remodeling, determine the relationship between contractile dysfunction and structural remodeling.
b. Hypothesis: the contractile dysfunction is primary and structural remodeling secondary.
Investigators
Eligibility Criteria
Inclusion Criteria
- •Idiopathic dilated cardiomyopathy with New York Heart Association Class II-IV symptoms
- •No evidence of coronary artery disease by angiography within 2 years of randomization
- •If female, patient is (a) surgically sterile or (b) practices an accepted method of birth control and has negative serum pregnancy test
- •Patient has been on other conventional cardiac heart failure(CHF) therapy at least 3 weeks prior to baseline assessments (includes angiotensin converting enzyme inhibitors, digoxin, diuretics, and/or vasodilators)
- •Patient has left ventricular ejection fraction \< 40% by radionuclide ventriculography within 60 days of randomization
- •Patient must demonstrate mental and physical ability and willingness to follow all study-specific instructions
- •Patient must voluntarily sign Institutional Review Board (IRB)-approved informed consent form prior to any study-specific procedure
Exclusion Criteria
- •Patient has heart failure due to or associated with uncorrected primary valvular disease, uncorrected thyroid disease, obstructive/hypertrophic cardiomyopathy, pericardial disease, amyloidosis, active myocarditis, or malfunctioning artificial heart valve.
- •Patient is actively on heart transplant list or anticipated to be within 6 months of randomization
- •Patient is receiving any of the following medicines:
- •Calcium channel blockers
- •Theophylline
- •Tricyclic antidepressants
- •Monoamine oxidase inhibitors
- •β-adrenergic blocking agent (oral)
- •Any investigational cardiovascular medication or involvement in another investigational trial
- •Flecainide, encainide, propafenone, sotalol, disopyramide, or amiodarone
Arms & Interventions
Metoprolol succinate
Idiopathic dilated cardiomyopathy patients randomized to metoprolol succinate titrated to a goal of 200 mg by mouth daily for 18 months
Intervention: Metoprolol succinate
Metoprolol succinate + doxazosin
Idiopathic dilated cardiomyopathy patients who were randomized to receive metoprolol succinate and doxazosin titrated to a goal of 200 mg and 8 mg by mouth daily for 18 months
Intervention: Metoprolol succinate + doxazosin
Carvedilol
Idiopathic dilated cardiomyopathy patients who were randomized to receive carvedilol titrated to a goal of 25 mg by mouth twice daily for 18 months
Intervention: Carvedilol
Outcomes
Primary Outcomes
Improvement in Left Ventricular Ejection Fraction (LVEF) at 12 Months
Time Frame: 12 months
The primary clinical outcome will be LVEF response at 12 months defined as an improvement in LVEF of ≥ 8% at 12 months or if not available, ≥5% at 3 months in the absence of an adverse clinical outcome. Data are not presented for non-failing controls, who only went baseline evaluation and did not undergo treatment, given that they did not have heart failure.
Secondary Outcomes
- Composite of All-cause Mortality, Need for Heart Transplant or Need for Ventricular Assist Device.(18 months)
- Improvement in LVEF at 3 Months(3 months)