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Myocardial hibernation: a noninvasive physician's point of view
1Division of Cardiology, Northwestern University Medical School, 201 East Huron Street Suite 10-240 Chicago, IL 60611 USA. r-bonow@northwestern.edu
Insights
Detecting viable myocardium in coronary artery disease patients with left ventricular (LV) dysfunction is crucial. Identifying hibernating myocardium can predict improved function and survival after revascularization.
Area of Science:
- Cardiology
- Medical Imaging
- Nuclear Medicine
Background:
- Left ventricular (LV) dysfunction in coronary artery disease (CAD) often stems from hibernating myocardium, not irreversible damage.
- Assessing myocardial viability is critical as it predicts functional recovery after revascularization.
Purpose of the Study:
- To evaluate noninvasive imaging techniques for assessing myocardial viability in patients with LV dysfunction.
- To determine the clinical relevance of detecting reversibly dysfunctional myocardium for treatment selection.
Main Methods:
- Utilized nuclear cardiology techniques to assess perfusion, membrane integrity, and metabolic activity.
- Employed dobutamine echocardiography to evaluate regional inotropic reserve.
- Incorporated contrast-enhanced magnetic resonance imaging for viability assessment.
Main Results:
- Nuclear cardiology offers unique insights into myocardial viability based on perfusion and metabolic status.
- Dobutamine echocardiography effectively assesses regional contractile reserve.
- Contrast-enhanced MRI is a valuable tool for myocardial viability assessment.
Conclusions:
- Identifying hibernating myocardium in LV dysfunction patients indicates potential for significant functional improvement post-revascularization.
- Myocardial viability assessment aids in selecting appropriate patients for revascularization, potentially improving symptoms and survival.
Abstract:
In a large subset of patients with coronary artery disease and left ventricular (LV) dysfunction. LV performance is reduced on the basis of regionally ischemic or hibernating myocardium rather than irreversibly infarcted myocardium. The detection of reversibly dysfunctional myocardium is clinically relevant, as regional and global LV function in such patients may improve substantially after revascularization. Noninvasive imaging methods to assess myocardial metabolic activity, membrane integrity, and inotropic reserve are ideally suited for this assessment. Among these are the unique potential of nuclear cardiology techniques to distinguish viable regions on the basis of perfusion, cell membrane integrity, and metabolic activity and the ability of dobutamine echocardiography to assess regional inotropic reserve. Contrast-enhanced magnetic resonance imaging has also emerged as important method for viability. assessment. Patients with LV dysfunction and extensive regions of hibernating myocarduim appear to have the potential not only for improved left ventricular function after revascularization, but also for improved symptoms and improved survial. This, assessing myocardial viability may provide important information regarding the selection of patients with LV dysfunction for myocardial revascularization procedures.