What is normal myocardial perfusion?
Abstract. Background: Normal or near normal myocardial perfusion stress imaging (MPI) suggests the absence of life-threatening coronary artery disease (CAD). Nevertheless, there are instances where severe left main or three-vessel CAD may be present despite no significant perfusion abnormalities on MPI.
Is myocardial perfusion imaging safe?
Myocardial perfusion imaging is a noninvasive method for evaluating this blood flow. We also use the scans to look for damage after a heart attack and to determine if previous treatment has helped. While perfusion assessment may reqire you to exercise, the testing process is safe and painless.
What is a mild fixed perfusion defect?
Non-reversible defect (fixed) shows no significant changes in activity between post-stress or rest images. Severe fixed defect most likely represents scarring or fibrosis from prior MI, but a mild or moderate fixed defect may indicate hibernating myocardium or prior nontransmural MI.
What is a moderate perfusion defect?
In addition, a small-sized, moderate perfusion defect is noted in the left circumflex artery territory that is completely reversible and a medium-sized, moderate defect is noted in the right coronary artery territory that is predominantly reversible. Abbreviation: SPECT, single-photon emission computed tomography.
What is an abnormal TID ratio?
The TID ratio is the stress volume : rest volume. Abnormally elevated TID ratio has been defined with abnormal cut-off values ranging from 1.12-1.22 2.
What is an abnormal MPI?
Conclusions: Abnormal MPI may predict a higher likelihood for cardiovascular disease than suggested by normal cardiac coronary angiogram alone. MPI may reveal abnormalities of coronary flow and microvasculature than are not detected by the anatomy of coronary lumen. This group of patients may warrant closer monitoring.
What is a NM myocardial perfusion?
A nuclear medicine Myocardial Perfusion (MIBI) exam is used to study the structure and function of the heart. A small amount of radioactive tracer is injected into a vein in your arm and flows proportionally to the heart muscle, showing structure and function of the heart.