The ejection fraction is a measurement of the heart's efficiency
and can be used to estimate the function of the left ventricle, which pumps blood
to the rest of the body.
The left ventricle pumps only a fraction of the blood
it contains. The ejection fraction is the amount of blood pumped divided by the amount
of blood the ventricle contains. A normal ejection fraction is more than 55% of the
blood volume. If the heart becomes enlarged, even if the amount of blood being pumped
by the left ventricle remains the same, the relative fraction of blood being ejected
decreases. For example:
A healthy heart with a total blood volume of 100
mL that pumps 60 mL to the aorta has an ejection fraction of 60%.
with an enlarged left ventricle that has a total blood volume of 140 mL and pumps
the same amount (60 mL) to the aorta has an ejection fraction of 43%.
Adam Husney, MD - Family Medicine & Rakesh K. Pai, MD - Cardiology, Electrophysiology &
Martin J. Gabica, MD - Family Medicine & Stephen Fort, MD, MRCP, FRCPC - Interventional Cardiology
This information does not replace the advice of a doctor.
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