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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 is usually expressed as a percentage. A normal heart pumps a little more than half the heartâs blood volume with each beat. (1). A normal LVEF ranges from 55-70%.A LVEF of 65, for example, means that 65% of the total amount of blood in the left ventricle is pumped out with each heartbeat.The LVEF may be lower when the heart muscle has become damaged due to a heart attack, heart muscle disease (cardiomyopathy), or other causes.jection fraction is usually expressed as a percentage. A normal heart pumps a little more than half the heartâs blood volume with each beat. (1). A normal LVEF ranges from 55-70%.