ejection fraction
The percentage of blood pumped out of the left ventricle with each heartbeat, a key measure of heart function.
Full Definition
Ejection fraction is a critical measurement that represents the percentage of blood pumped out of the left ventricle during each cardiac cycle, calculated by dividing stroke volume by end-diastolic volume. Normal ejection fraction typically ranges from 50-70%, with reduced ejection fraction (generally <40%) indicating systolic dysfunction and heart failure. This parameter is fundamental in cardiac rehabilitation as it helps determine exercise capacity, risk stratification, and appropriate intensity levels. Patients with reduced ejection fraction require more conservative exercise prescription and closer monitoring. Ejection fraction is commonly assessed through echocardiography, nuclear imaging, or cardiac catheterization, and improvements in this measure can indicate positive response to rehabilitation interventions.
Usage
Usage note: Abbreviate as EF only after first use; distinguish from LVEF when referring specifically to left ventricular function.
In Context
- "The patient's ejection fraction improved from 35% to 45% following completion of the rehabilitation program." — Outcome assessment report
- "Exercise intensity was limited due to the patient's reduced ejection fraction of 30%." — Exercise prescription rationale