An approach to myocardial viability based on perfusion, function and metabolic substrates

Area of Science:

• Cardiology
• Nuclear Medicine
• Medical Imaging

Background:

• Myocardial viability assessment is key in managing coronary artery disease (CAD) and left ventricular dysfunction.
• Down-regulation of contractile function in viable myocardium can be reversed with revascularization.
• Altered cellular metabolism in non-contractile myocardium necessitates evaluation of overall oxidative metabolism.

Purpose of the Study:

• To highlight the importance of assessing myocardial viability in patients with CAD and ventricular dysfunction.
• To discuss the role of nuclear cardiology imaging techniques in evaluating myocardial viability.
• To emphasize the clinical value of tests combining blood flow and ventricular wall motion assessment.

Main Methods:

• Review of nuclear cardiology imaging techniques, including thallium imaging and positron emission tomography (PET).
• Discussion of how these techniques monitor oxidative phosphorylation and predict cardiac tissue viability.
• Emphasis on the diagnostic potential of tests integrating coronary blood flow and left ventricular wall motion.

Main Results:

• Nuclear imaging can monitor oxidative phosphorylation, predicting overall cardiac tissue viability.
• Positron emission tomography (PET) is considered a gold standard for myocardial viability assessment.
• PET data demonstrate clinical impact on patient management, treatment, and prediction of long-term outcomes.

Conclusions:

• Functional evaluation of myocardial viability is essential for patients with CAD and significant left ventricular dysfunction.
• Diagnostic tests combining blood flow and wall motion assessment are valuable for identifying candidates for revascularization.
• Patients should undergo viability testing to explore potential reversibility before being considered for end-stage heart disease.