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MUGA SCAN A muga scan involves the use of a tiny amount of a radioactive substance that mixes with the blood and allows taking pictures of the heart in motion. This test allows the cardiologist to assess the size of the cavities of the heart and quantifies the strength of the heart muscle. The computer will give a number (Ejection Fraction or "EF") that represents pumping capacity (squeeze) of the heart. This number (EF) will assist the cardiologist to choose the right type of heart medications and is very helpful to follow the patient’s progress.
The EF number correlates strongly with the long-term prognosis, especially after a heart attack. The EF refers to the left ventricle (the main pumping chamber). The normal value for most patients is 55-65% (not 100% as some patients think!). An example of mild reduction in the strength of the heart muscle is EF between 40-50%. Moderate reduction is 26-40% and severe reduction is 25% or less. Patients with EF numbers as low as 10-15% carry a very poor prognosis but may be candidates for participation in a clinical research trial, if one is currently available.
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