myocardial viability assessment
Testing to determine whether dysfunctional cardiac tissue retains metabolic activity and may recover function after revascularization.
Full Definition
A diagnostic evaluation using imaging modalities like dobutamine stress echocardiography, cardiac MRI, or nuclear scintigraphy to assess whether areas of myocardium with reduced contractility are hibernating or stunned (viable) versus irreversibly damaged (non-viable). This assessment guides clinical decisions about revascularization procedures, as viable myocardium is likely to improve function after restoration of blood flow, while non-viable tissue will not recover. The distinction is crucial for determining optimal treatment strategies in patients with ischemic cardiomyopathy.
Usage
Usage note: Often abbreviated as 'viability testing' in informal contexts, but full term preferred in formal documentation.
In Context
- "The protocol required myocardial viability assessment before enrolling patients with reduced ejection fraction in the revascularization arm." — Clinical trial protocol
- "Dobutamine stress echocardiography was used for myocardial viability assessment in 127 of the 340 enrolled subjects." — Research manuscript