In cardiovascular physiology, ejection fraction (EF) represents the volumetric fraction of blood pumped out of the ventricle (heart) with each heart beat or cardiac cycle. It can be applied to either the right ventricle which ejects via the pulmonary valve into the pulmonary circulation or the left ventricle which ejects via the aortic valve into the systemic circulation.
Imaging of the physiology of the mammalian heart is the art that allows meaningful mathematical expression defining EF. Noninvasive cardiac imaging has become a worldwide utility enabling study of cardiac performance noninvasively, reproducibly and inexpensively. Simplified, Ejection fraction is a mathematical product allowed by cardiac imaging. As a mathematical term, Ejection Fraction is an extension of the work of Adolph Fick in cardiac output. Dedicated technology such as Echocardiography, Computed Tomography, Magnetic Resonance Imaging and MUGA scanning have definitively allowed clinically relevant mathematics regarding Ischemia, Congenital Heart Disease and Heart Failure.
RVEF and LVEF may vary widely from one another incumbent upon physiologic state. Ventricular dyssynchrony represents theoretical pathology in which the LVEF and RVEF combined may be less than 100%. Without a qualifier, the term ejection fraction basically refers to the blood output of the left ventricle.
Other articles related to "injection fraction, fraction":
... Ejection fraction is commonly measured by echocardiography, in which the volumes of the heart's chambers are measured during the cardiac cycle ... Ejection fraction can then be obtained by dividing stroke volume by end-diastolic volume as described above ... Other methods of measuring ejection fraction include cardiac MRI, fast scan cardiac computed axial tomography (CT) imaging, ventriculography, Gated SPECT, and the MUGA scan ...
Famous quotes containing the word fraction:
“The mother as a social servant instead of a home servant will not lack in true mother duty.... From her work, loved and honored though it is, she will return to her home life, the child life, with an eager, ceaseless pleasure, cleansed of all the fret and fraction and weariness that so mar it now.”
—Charlotte Perkins Gilman (18601935)