ejection fraction
Also written as: EF — ejection fraction
A measurement expressing the percentage of blood pumped out of the heart's left ventricle with each contraction.
Full Definition
Ejection fraction (EF) is a key cardiac parameter that quantifies the percentage of blood volume ejected from the left ventricle during systole, typically expressed as a percentage. Normal ejection fraction ranges from 55-70%, with reduced EF (<40%) indicating systolic heart failure. This measurement is fundamental in cardiology literature and appears frequently in clinical studies, case reports, and treatment guidelines. Editors must ensure proper capitalization and abbreviation usage, as 'EF' is standard in most contexts while 'ejection fraction' should be spelled out on first mention.
Usage
Usage note: Always spell out on first mention, then use 'EF' abbreviation. Ensure percentage symbol follows immediately without space.
In Context
- "The patient's ejection fraction improved from 25% to 45% following six months of guideline-directed medical therapy." — Clinical research paper
- "Echocardiography revealed a preserved ejection fraction of 62% with normal wall motion." — Case report