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In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography
Published on: February 16, 2016
Contrast echocardiography for the assessment of myocardial viability
1Department of Cardiology, Northwick Park Hospital, Harrow HA1 3UJ, UK.
Insights
Myocardial contrast echocardiography (MCE) is a safe and practical bedside tool for assessing heart muscle viability after heart attack. MCE accurately differentiates damaged from viable tissue, aiding treatment decisions for coronary artery disease.
Area of Science:
- Cardiology
- Medical Imaging
- Echocardiography
Background:
- Assessing myocardial viability is crucial for guiding revascularization strategies in coronary artery disease and post-myocardial infarction.
- Non-invasive methods are needed to distinguish viable from irreversibly damaged myocardium.
- Myocardial contrast echocardiography (MCE) offers simultaneous assessment of myocardial structure, function, and perfusion.
Purpose of the Study:
- To review the role of MCE in assessing myocardial viability and predicting functional recovery.
- To highlight MCE's utility in clinical decision-making for patients with coronary artery disease and left ventricular dysfunction.
Main Methods:
- Myocardial contrast echocardiography utilizes gas-filled microspheres (microbubbles) that remain intravascular.
- Simultaneous assessment of global and regional myocardial structure, function, and perfusion is enabled.
- Data supports MCE's role in viability assessment and predicting functional recovery.
Main Results:
- MCE accurately differentiates myocardial stunning from necrosis.
- It delineates the transmural extent of infarction and predicts left ventricular systolic function recovery.
- MCE identifies patients at high risk for left ventricular remodeling and provides incremental viability data with low-dose dobutamine.
Conclusions:
- Technological advancements have established MCE as a safe and practical bedside technique for myocardial viability evaluation.
- MCE demonstrates comparable accuracy to other non-invasive imaging modalities like dobutamine stress echocardiography, radionuclide scintigraphy, and cardiac MRI.
Purpose Of Review:
The availability of an accurate, non-invasive method for distinguishing viable from irreversibly damaged myocardium, after acute myocardial infarction or in chronic coronary artery disease, is important in clinical decision making. Such a tool would enable physicians to identify patients most likely to benefit from revascularization strategies in patients with coronary artery disease and left ventricular dysfunction. Myocardial contrast echocardiography is a new technique that utilizes acoustically active gas-filled microspheres (microbubbles), which remain exclusively in the intravascular space and allow the simultaneous assessment of global and regional myocardial structure, function, and perfusion. An increasing body of data supports its role in assessing myocardial viability and predicting the recovery of function.
Recent Findings:
Myocardial contrast echocardiography accurately differentiates 'stunning' from necrosis, delineates transmural extent of infarction, predicts recovery of regional and global left ventricular systolic function in the recuperative phase, identifies patients at high risk of left ventricular remodelling, and provides incremental viability data when performed in conjunction with low-dose dobutamine echocardiography.
Summary:
Technological advances have positioned myocardial contrast echocardiography as a safe, practical bedside technique for the evaluation of myocardial viability. It has comparable accuracy with other non-invasive imaging techniques, such as dobutamine stress echocardiography, radionuclide scintigraphy and cardiac magnetic resonance imaging.
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