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.
Left ventricular ejection fractions, or LVEF, may be lower than normal when patients have heart damage due to conditions such as heart attacks or heart muscle disease, states Cleveland Clinic. An ejection fraction of less than 40 percent may indicate that a patient is suffering from heart failure.