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What Is Ventricular Dyssynchrony? The heart contracts and relaxes when it beats. During the contraction, it pushes blood out of large chambers called ventricles. These ventricles fill up with blood again as the heart relaxes. Ejection fraction is the percentage of blood that the heart pushes out during a contraction.
The percentage typically refers to the ejection fraction of the left ventricle, the chamber of the heart that pumps blood to the head, arms, torso, abdomen, and legs.
The ejection fraction is an important measure of heart functioning. For example, a low ejection fraction could indicate a heart condition. One common method involves an echocardiogram. Echocardiograms are a type of ultrasound scan that uses high frequency sound waves to create pictures of internal organs. To perform an echocardiogram , a doctor will place a small probe on the chest. They will then move the probe around the chest to create a live image on a monitor. A doctor will thread a long, thin tube through a blood vessel to the heart.
They will inject a contrast dye and then see how much of it leaves the heart through the arteries with each heartbeat. This test, which people sometimes refer to as a MUGA scan, takes a picture of the heart using a special camera and a radioactive tracer in the blood.
Once the doctor has measured the ejection fraction, they will compare it to the typical ranges. These are as follows:. A normal score means that the heart is pumping an adequate amount of blood with each contraction. It is still possible to have heart failure with a normal ejection fraction. Doctors refer to this as heart failure with preserved ejection fraction HFpEF or diastolic heart failure.
It occurs when the heart muscle is too thick or stiff and does not relax enough to allow the normal volume of blood to fill up the ventricles. The heart may pump out blood at a normal rate, but the amount of blood might be too low. The heart muscle can thicken with age. The thickening of the heart increases the risk of atrial fibrillation in older adults. With each heartbeat, the heart pumps blood from the left and right ventricle.
In most cases, ejection fraction refers to the percentage of blood that's pumped out of the left ventricle with each heartbeat. There are two types of ejection fraction: left ventricular and right ventricular. Left ventricular measures how much blood gets pumped from the left ventricle with each contraction. Typically, ejection fraction refers to left ventricular.
Right ventricular ejection fraction measures how much blood is pumped out of the right side of the heart, to the lungs.
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