Ejection fraction increases with:

Ganong 22 - The amount of blood ejected by each ventricle per stroke at rest is 70 to 90 ml. the end diastolic ventricular volume is about 130 ml. thus, about 50 ml of blood remains in each ventricle at the end of systole (end systolic ventricular volume), and the ejection fraction, the percent of the end diastolic ventricular volume that is ejected with each stroke, is about 65%. The ejection fraction is a valuable index of ventricular fraction.