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Ejection fraction (EF) is the fraction of outbound blood pumped from the heart with each heartbeat. It is commonly measured by echocardiogram and serves as a general measure of a person's cardiac function. Ejection fraction is typically low in patients with Systolic congestive heart failure. Ejection fraction is a similar but distinct mathematical model when compared to stroke volume, which (along with heart rate) determines cardiac output, which is the amount of blood the heart pumps per minute. Mathematical models of Volume vs. Time are well documented in the encyclopedia.
Ejection fraction refers to the relative amount of blood that is pumped out of both the right and left ventricles with each contraction of the heart. There are a number of ways to increase ejection fraction, with regular exercise and a heart-healthy diet being the safest and most effective. Like any machine, there are times when the heart is functioning efficiently and healthily. Other times, different factors may cause the heart to function improperly.