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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.
As not all of the blood is ejected from the heart with the contraction of the ventricles, the âejection fraction is the amount that is ejected after the ventricle is filled. The main ventricle of the heart valve is the left ventricle, the ejection fraction of the heart is measured here. Therefore, it can be stated that the normal range for the left ventricle (LV) ejection fraction is 55 to 70 percent. slide 2 of 4.