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.
An ejection fraction (EF) is the fraction of blood ejected from a ventricle of the heart with each heartbeat. It is calculated by dividing the stroke volume by the end-diastolic volume, and is an inherent measure of the pumping efficiency of the heart.