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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).

Ejection fraction (EF) is a measurement, expressed as a percentage, of how much blood the left ventricle pumps out with each contraction. An ejection fraction of 60 percent means that 60 percent of the total amount of blood in the left ventricle is pushed out with each heartbeat.

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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