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Imaging to distinguish between viable and nonviable myocardium: pathophysiologic basis and importance of positron
1Edward Mallinckrodt Institute of Radiology, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO 63110.
Insights
Identifying viable heart tissue is crucial for treating coronary artery disease. This review explores methods to distinguish healthy, salvageable heart muscle from damaged tissue, aiding treatment decisions for improved patient outcomes.
Area of Science:
- Cardiology
- Nuclear Medicine
Background:
- Strategies for left ventricular dysfunction aim to restore blood flow and salvage heart muscle.
- Accurate differentiation of viable (reversibly dysfunctional) from nonviable (persistently dysfunctional) myocardium is essential for guiding interventions like coronary revascularization.
- Current consensus on the optimal diagnostic approach for this differentiation is lacking.
Purpose of the Study:
- To summarize the pathophysiologic characteristics of viable and nonviable myocardium.
- To discuss diagnostic methods for detecting viable myocardium.
- To emphasize positron emission tomography (PET) for its quantitative metabolic assessment of tissue viability and functional recovery potential.
Main Methods:
- Review of pathophysiologic characteristics of myocardial viability.
- Discussion of diagnostic techniques for identifying viable myocardium.
- Focus on positron emission tomography (PET) imaging.
Main Results:
- Viable myocardium exhibits reversible dysfunction, while nonviable myocardium shows persistent dysfunction.
- Various diagnostic methods exploit metabolic and functional differences between viable and nonviable tissue.
- PET is highlighted for its ability to quantify metabolic processes indicative of tissue viability and recovery capacity.
Conclusions:
- Distinguishing viable from nonviable myocardium is critical for effective treatment of coronary artery disease.
- Positron emission tomography offers a powerful tool for assessing myocardial viability and predicting functional recovery.
Abstract:
One goal of strategies designed to restore nutritive perfusion in patients with left ventricular dysfunction attributable to coronary artery disease is salvage of reversibly ischemic myocardium in an effort to improve patients' left ventricular function, signs and symptoms, and survival. Accurate identification of patients likely to benefit from interventions such as coronary revascularization requires the differentiation of viable (reversibly dysfunctional) myocardium from nonviable (persistently dysfunctional) tissue. To date, no consensus has been reached regarding the best approach for achieving this differentiation. In this review, the pathophysiologic characteristics of viable and nonviable myocardium are summarized, and diagnostic methods that exploit these characteristics for the purposes of detecting viable myocardium are discussed. Emphasis is placed on approaches that use positron emission tomography because of its usefulness in quantifying those specific metabolic processes that support both tissue viability and the capacity for functional recovery.