Significance of Regional Ventriculo-arterial Coupling in Patients With Chronic Heart Failure: Effects of Endothelial Progenitor Cells and a Direct Renin Inhibitor
Overview
- Phase
- Phase 4
- Intervention
- Aliskiren
- Conditions
- Heart Failure
- Sponsor
- Taipei Veterans General Hospital, Taiwan
- Enrollment
- 120
- Locations
- 2
- Primary Endpoint
- LV systolic function, the global longitudinal strain
- Last Updated
- 15 years ago
Overview
Brief Summary
Heart failure is a major health problem worldwide. Optimal treatment of this disabling and fatal condition may require functional characterization of the failed left ventricle (LV) and its interaction with the arterial system. Part of the physiological significance of the ventriculo-arterial coupling has been studied experimentally and clinically using the framework of the ratio of effective arterial elastance (Ea) to end-systolic elastance (Ees), with limited clinical applications.
From central ascending aorta to terminal arterioles, every segment of the arterial tree contributes to the arterial loads that interact and impact LV performance in both systole and diastole, leads to atrial and ventricular remodeling and hypertrophy, and results in the development of heart failure. On the other hand, the ventricular systole is a complex coordination of multi-directional myocardial fibers involving longitudinal contraction, circumferential shortening, radial thickening, twist, and torsion, the so-called LV deformations.
The purposes of the present study are to investigate the relationship between different components of hemodynamic load or arterial abnormalities and different components of LV myocardial deformations or regional LV function, the modulating effects of endothelial progenitor cells (EPCs) on the ventriculo-arterial coupling, and the therapeutic effects of aliskiren on the components of hemodynamic load and LV myocardial deformations and their couplings. The investigators will also investigate whether the ventriculo-arterial coupling, EPCs, and add-on therapy of aliskiren predict cardiovascular outcomes.
Detailed Description
In the proposed 3-year project, we hypothesize that the different components of arterial load are coupled with different components of LV function. The regional ventriculo-arterial couplings may be important in the pathogenesis of heart failure and ventricular remodeling, and in the prediction of future cardiovascular events. Therapies targeting these may play a role in the prevention and treatment of heart failure. Therefore, we will study at least 120 patients with chronic heart failure (NYHA Class II-IV) who will randomly receive a direct renin inhibitor, aliskiren, or a placebo for 6 months on top of standard therapy.
Investigators
Eligibility Criteria
Inclusion Criteria
- •Outpatients ≥ 18 years of age, male or female. Female patients must be either post-menopausal for one year, surgically sterile, or using effective contraceptive methods such as oral contraceptives, barrier method with spermicide or an intrauterine device.
- •Patients with a diagnosis of chronic heart failure (NYHA Class II-IV) and reduced systolic function: LVEF ≤ 45% at Visit 1 (local measurement, measured within the past 6 months assessed by echocardiogram, MUGA, CT scan, MRI or ventricular angiography).
- •NT-pro BNP ≥ 600pg/ml (BNP ≥ 150 pg/ml) at Visit 1 or NT-pro BNP ≥ 450 pg/mL (BNP (≥ 100 pg/ml) and a hospitalization for HF within last 12 months
- •Patients must be on a stable dose of either an ACE inhibitor or an ARB for at least 4 weeks prior to Visit
- •Patients must be treated with a beta blocker, unless contraindicated or not tolerated, at a stable dose for at least 4 weeks prior to Visit
- •Patients with documented sinus rhythm at Visit
Exclusion Criteria
- •History of hypersensitivity to any of the study drugs.
- •Patients who require treatment with both ACEI and ARB.
- •Current acute decompensated HF (exacerbation of chronic HF manifested by signs \& symptoms that may require IV therapy).
- •Symptomatic hypotension and/or less than 100 mmHg at the time of screening or less than 90 mmHg at the time of randomization.
- •eGFR \< 30 ml/min/1.73m2 as measured by the MDRD formula at Visit 1 (screening) , or a \> 25% decrease after 14 days of active run-in period.
- •Serum potassium \> 5.0 mmol/L at screening (Visit 1).
- •Acute coronary syndrome, stroke, transient ischemic attack, cardiac, carotid or major vascular surgery, percutaneous coronary intervention (PCI) or carotid angioplasty, within the past 3 months prior to visit
- •Coronary or carotid artery disease likely to require surgical or percutaneous intervention within the 6 months after Visit
- •Patients with active or unstable bronchospasm or asthma (patients must be on stable regimen of respiratory medications for 1 month prior to Visit 1).
- •Right heart failure due to severe pulmonary disease.
Arms & Interventions
Aliskiren
Intervention: Aliskiren
placebo
Intervention: Aliskiren
Outcomes
Primary Outcomes
LV systolic function, the global longitudinal strain
Time Frame: 1 year
During 1-year treatment, ventricular systolic functions would be measured by using speckle tracking and presented as global longitudinal, circumferential, and radial strain at baseline and at the end of study. The changes of strain would be compared between 2 study groups.
Secondary Outcomes
- plasma NT-proBNP level(1 year)