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FDG uptake within regionally stunned myocardium
1Department of Cardiology, Veteran's Administration Medical Center, Minneapolis, MN 55417, USA.
Insights
Myocardial stunning, a post-ischemic dysfunction, can be identified by positron emission tomography. This technique reveals a "flow-metabolism mismatch," predicting which patients benefit from reperfusion therapies.
Area of Science:
- Cardiology
- Nuclear Medicine
- Medical Imaging
Background:
- Myocardial function can be depressed without overt ischemia or infarction.
- Myocardial stunning is defined as persistent contractile depression after ischemia and reperfusion.
Purpose of the Study:
- To review the role of positron emission tomography in identifying myocardial viability.
- To highlight the significance of the time course of fluorine 18-fluorodeoxyglucose uptake in stunned myocardium.
Main Methods:
- Utilizing positron emission tomography to assess myocardial viability.
- Evaluating fluorine 18-fluorodeoxyglucose (FDG) uptake in relation to perfusion.
- Identifying the
- flow-metabolism mismatch
- pattern.
Main Results:
- Enhanced FDG uptake relative to perfusion indicates viability in stunned myocardium.
- The "flow-metabolism mismatch" pattern predicts response to reperfusion therapies.
- The temporal dynamics of FDG uptake are crucial for understanding stunned myocardium.
Conclusions:
- Positron emission tomography is vital for detecting myocardial viability in stunned regions.
- Understanding the time course of FDG uptake enhances the clinical utility of imaging.
- Identifying stunned myocardium aids in selecting patients for reperfusion therapies.
Abstract:
Clinical cardiologists are now aware of several conditions in which myocardial function can be depressed in the absence of overt ischemia or infarction. Myocardial stunning refers to a particular situation in which the contractile state of the myocardium remains depressed after a brief period of ischemia and reperfusion. Positron emission tomography has been shown to be an important tool for identifying viability within stunned myocardium on the basis of enhanced fluorine 18-fluorodeoxyglucose (FDG) uptake relative to perfusion. This image pattern has been referred to as a ¿flow-metabolism mismatch¿ and is predictive of patients who would benefit from reperfusion therapies. This review highlights the importance of considering the time course of altered FDG uptake within regionally stunned myocardium.