- in this respect).
* * *ejection fraction n the ratio of the volume of blood the heart empties during systole to the volume of blood in the heart at the end of diastole expressed as a percentage usu. between 50 and 80 percent
* * *the proportion of the volume of blood in the ventricles at the end of diastole that is ejected during systole; it is the stroke volume divided by the end-diastolic volume, often expressed as a percentage. It is normally 65 ± 8 per cent; lower values indicate ventricular dysfunction.
Medical dictionary. 2011.
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