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Medical Term:

ejection fraction

 

Definition: the fraction of the blood contained in the ventricle at the end of diastole that is expelled during its contraction, the stroke volume divided by end-diastolic volume, normally 0.55 (by electrocardiogram) or greater; with the onset of congestive heart failure, the ejection fraction decreases, sometimes to 0.10 or even less in severe cases.

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