Characteristics of dysfunctional but viable myocardium
| Characteristic | Technique | Signs of viability |
|---|---|---|
| FDG, F18-fluorodeoxyglucose; MRI, magnetic resonance imaging; SPECT, single photon emission computed tomography. | ||
| Contractile reserve | Dobutamine echocardiography, dobutamine MRI | Improved contraction during infusion of low dose dobutamine |
| Intact cell membrane | Thallium-201 SPECT | Tracer activity >50% |
| Redistribution (>10%) | ||
| Intact mitochondria | Technetium-99 m SPECT | Tracer activity >50% |
| Improved tracer uptake after nitrates | ||
| Glucose metabolism | FDG imaging | Tracer activity >50% |
| Preserved perfusion/FDG uptake | ||
| Perfusion–metabolism mismatch | ||