Key result
The relative severity of irreversible perfusion defects on rubidium-82 imaging did not enable differentiation between hibernating myocardium and scar (P=0.61).
Why the study?
Does the relative severity of irreversible perfusion defects on rubidium-82 imaging differentiate hibernating myocardium from scar in patients with previous myocardial infarction?
Observational (n=145)
Does the relative severity of irreversible perfusion defects on rubidium-82 imaging differentiate hibernating myocardium from scar in patients with previous myocardial infarction?
p-value: p=0.61
The severity of irreversible perfusion defects on rubidium-82 imaging cannot reliably distinguish between hibernating myocardium and scar.
Rubidium-82 defect severity cannot differentiate hibernating myocardium from scar; leaves open need for alternative viability assessment in post-MI patients.
PURPOSE: To determine whether quantitation of the relative severity of decreased perfusion in irreversible defects on myocardial perfusion images enables differentiation of viable hibernating myocardium from scar. MATERIALS AND METHODS: In 145 patients with previous myocardial infarction, 1,252 regions with irreversible defects proved by means of rubidium-82 rest-stress imaging were analyzed for relative severity (percentage decrease in perfusion). Myocardial tissue viability was determined by means of positron emission tomography with fluorine-18 fluorodeoxyglucose (FDG). RESULTS: The relative decreases in Rb-82 uptake in the 1,252 regions were categorized into nine levels of severity (30% to > or = 70%) in 381 regions of hibernating myocardium and 871 regions of scar. The values of relative decreased perfusion in the irreversible defects alone did not enable differentiation of hibernating myocardium and scar (P = .61). CONCLUSION: The results show no relationship between the relative severity of irreversible perfusion defects and the ability to distinguish between hibernating myocardium and scar.
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Go et al. (1995) conducted an observational in Previous myocardial infarction (n=145). Relative severity of decreased perfusion on rubidium-82 imaging was evaluated on Differentiation of viable hibernating myocardium from scar (p=0.61). The relative severity of irreversible perfusion defects on rubidium-82 imaging did not enable differentiation between hibernating myocardium and scar (P=0.61).
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