Harvard Heart Letter

Understanding ejection fraction

Ask the doctor [IMGCAP(1)] Q. My doctor wants to measure my ejection fraction. What does that mean, and what should I expect? A. With every heartbeat, your heart contracts and relaxes. During the contraction, the heartís main pumping chamber, the left ventricle, ejects blood out to the rest of the body. When your heart relaxes, the ventricle refills with blood. The ejection fraction is the percentage of blood…

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