ejection fraction

noun

: the ratio of the volume of blood the heart empties during systole to the volume of blood in the heart at the end of diastole expressed as a percentage usually between 50 and 80 percent
An echocardiogram obtained 6 days after the initiation of chemotherapy showed that the ejection fraction had improved to 45%; 2 weeks later it was 66%.Patrick T. O'Gara et al., The New England Journal of Medicine

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Cite this Entry

“Ejection fraction.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/ejection%20fraction. Accessed 27 Sep. 2023.

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