Middle English (Scots) carne, from Scottish Gaelic carn; akin to Old Irish & Welsh carn cairn
Ejection fraction is commonly measured by an echocardiogram and serves as a general measure of a person's cardiac function. Ejection fraction is typically low in patients with the systolic form of congestive heart failure.
Typically, the left ventricle ejects 55% or more of its blood volume with each beat, so a normal ejection fraction is 55% (0.55) or higher. 1  An ejection fraction of 40 - 50% is considered âbelow normal.â Patients with heart failure most often have ejection fractions that are less than 40%. It is important to note that when doctors say the words âejection fractionâ they are referring to the ejection fraction of the left ventricle.