Molecular Mechanisms of Volume Overload-Aim 1(SCCOR in Cardiac Dysfunction and Disease)

Summary

The investigators hypothesize that beta-1 receptor blockade (ß1-RB) attenuates extracellular matrix (ECM) degradation and progressive adverse Left Ventricular (LV) remodeling and failure in the volume overload of mitral regurgitation (MR). Patients without coronary artery disease and moderate MR, as assessed by color/flow Doppler echocardiography, will be randomized to ß1-RB vs. placebo to address the following aims: \*Aim 1: Establish whether ß1-RB attenuates adverse LV remodeling compared to placebo in patients with non-surgical, chronic MR. Using 3-dimensional magnetic resonance imaging (MRI) and tissue tagging, LV function and geometry will be assessed at baseline and every 6 months for up to 2 years. Aim 2: Determine whether indices of inflammation correlate with degree of LV remodeling and whether ß1-RB decrease indices of inflammation and collagen turnover. At the time of MRI, blood samples for collagen breakdown products, matrix metalloproteinase (MMP) activity, and markers of excess production of reactive inflammatory species (RIS) will be obtained and related to changes in LV remodeling defined by serial 3-dimensional MRI and tissue tagging.

Timeline

Start

2004-08

Primary completion

2010-07

Completion

2010-07

Publications

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• Background Tallaj J, Wei CC, Hankes GH, Holland M, Rynders P, Dillon AR, Ardell JL, Armour JA, Lucchesi PA, Dell'Italia LJ. Beta1-adrenergic receptor blockade attenuates angiotensin II-mediated catecholamine release into the cardiac interstitium in mitral regurgitation. Circulation. 2003 Jul 15;108(2):225-30. doi: 10.1161/01.CIR.0000079226.48637.5A. Epub 2003 Jul 7.
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• Background Sorescu D, Griendling KK. Reactive oxygen species, mitochondria, and NAD(P)H oxidases in the development and progression of heart failure. Congest Heart Fail. 2002 May-Jun;8(3):132-40. doi: 10.1111/j.1527-5299.2002.00717.x.
• Background Wachtell K, Palmieri V, Olsen MH, Gerdts E, Papademetriou V, Nieminen MS, Smith G, Dahlof B, Aurigemma GP, Devereux RB. Change in systolic left ventricular performance after 3 years of antihypertensive treatment: the Losartan Intervention for Endpoint (LIFE) Study. Circulation. 2002 Jul 9;106(2):227-32. doi: 10.1161/01.cir.0000021601.49664.2a.
• Ahmed MI, Aban I, Lloyd SG, Gupta H, Howard G, Inusah S, Peri K, Robinson J, Smith P, McGiffin DC, Schiros CG, Denney T Jr, Dell'Italia LJ. A randomized controlled phase IIb trial of beta(1)-receptor blockade for chronic degenerative mitral regurgitation. J Am Coll Cardiol. 2012 Aug 28;60(9):833-8. doi: 10.1016/j.jacc.2012.04.029. Epub 2012 Jul 18.

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