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An ejection fraction (EF) is the volumetric fraction (or portion of the total) of fluid (usually blood) ejected from a chamber (usually the heart) with each contraction (or heartbeat).

An EF below 40 percent is considered low. This may show that a person has heart failure with reduced ejection fraction (HFrEF) or cardiomyopathy — an enlarged, thick, or stifef hjertef heart muscle. A lower EF means that the heart’s pumping action is weaker.

Ejeksjonsfraksjon er prosentandelen av volumet blod et hjertekammer er fylt med som det pumper ut i et hjerteslag. Ejeksjonsfraksjon er ett av flere viktige mål på hjertefunksjon. Det brukes blant annet i utredning og oppfølging av pasienter med hjertesvikt.

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