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What is ejection fraction?

Your heart contracts and relaxes about 100,000 times a day. As the heart relaxes between beats, the ventricles fill with blood. When it contracts, it pushes out most of that blood.

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Ejection fraction refers to the percentage or amount of blood in the hearts left ventricle (the lower chamber) that is pumped out with each contraction.

Even a healthy heart chamber doesnt expel its full contents at every beat. Instead, a normal ejection fraction lies somewhere between 55% to 70%. A low or reduced ejection fraction is considered to be any ejection fraction below 40%.