ejection fraction
The percentage of blood pumped out of the left ventricle with each heartbeat, a measure of cardiac function.
Full Definition
Ejection fraction (EF) is a key measurement of cardiac function that represents the percentage of blood volume ejected from the left ventricle during systole compared to the total volume at the end of diastole. Normal ejection fraction ranges from 55-70%. Reduced ejection fraction (typically <40%) indicates systolic heart failure and is associated with increased morbidity and mortality. Ejection fraction is commonly measured using echocardiography, but can also be assessed with cardiac catheterization, nuclear imaging, or cardiac MRI. It is a critical parameter in determining surgical candidacy and prognosis for cardiovascular procedures.
Usage
Usage note: Express as percentage; always specify left ventricular when abbreviated as LVEF
In Context
- "Preoperative echocardiography revealed an ejection fraction of 35% with global hypokinesis." — preoperative assessment
- "The patient's ejection fraction improved from 40% to 55% six months post-revascularization." — follow-up report