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Detection of Viability of Dysfunctional Myocardium in Coronary Heart Disease. II. Echocardiography

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Abstract

The detection of viable myocardium in patients with severe left ventricular (LV) dysfunction is important because these patients benefit most from revascularization. Three echocardiographic techniques can be used for the noninvasive assessment of functional correlates of viable myocardium. Two-dimensional echocardiography (2DE) is well suited for quantifying resting LV regional and global systolic function and dysfunction before and after revascularization, in addition to providing data on chamber size, shape, and wall thicknesses. The presence of hypokinesis on a resting 2DE indicates that viable myocardium is definitely present, but presence of dykinesis does not exclude viability. Dobutamine stress echocardiography (DSE) before revascularization unmasks viability by demonstrating augmentation of systolic function. Several clinical studies have shown that improvement of regional function during DSE indicates contractile reserve and predicts improvement of function after revascularization. A biphasic response on DSE appears to predict residual coronary artery stenosis and is a reliable marker of viability. DSE also appears to be useful after revascularization for unmasking contractile reserve. Myocardial contrast echocardiography (MCE) detects viability by defining microvascular perfusion, the extent of myocardium at risk, and coronary flow reserve. The clinical utility of MCE is undergoing evaluation. The combination of DSE and MCE might provide an improved estimate of the extent of viable myocardium based on assessment of function and perfusion. Meanwhile, echocardiographic and nuclear techniques can be used to complement each other in the assessment of myocardial viability.

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Authors
  1. Bodh I. Jugdutt
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  2. Dante E. Manyari
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  3. Dennis P. Humen
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Jugdutt, B.I., Manyari, D.E. & Humen, D.P. Detection of Viability of Dysfunctional Myocardium in Coronary Heart Disease. II. Echocardiography. Heart Fail Rev 2, 207–233 (1998). https://doi.org/10.1023/A:1009724930745

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