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.
Heart valve problems. An ejection fraction between 40 and 50 percent may indicate damage to the heart muscle (e.g., from a prior heart attack). Typically, this EF level alone is not low enough to lead to heart failure. But a very low ejection fraction of only 15-25% is indicative of a failing heart or cardiomyopathy.