A Answers (6)
American Heart Association answeredThe heart’s ejection fraction is a term that describes how well the heart can pump blood out of the chamber. A heart specialist will determine how much blood fills the chamber when the heart is relaxed and will compare that to the amount of blood that is squeezed out of the chamber once the heart contracts. The heart should be able to pump out 50-60% or more of the blood in the chamber during a contraction in order to keep blood circulating well. When that number falls, especially if it falls down into the 35%-and-below range, it can indicate a significant problem with either the valve or the heart muscle responsible for contracting.
Piedmont Heart Institute answered
The ejection fraction is a measure of how well the heart is pumping blood. The measurement describes the percent of blood inside the ventricle chamber that is pumped into the body with each heartbeat. A healthy ejection fraction is 55 to 60 percent of the blood inside the ventricle. This measurement is often taken during an echocardiogram, a test that uses sound waves to make an image of the heart.
The amount of blood that is pumped out by the heart in one beat is called the ejection fraction.
An ejection fraction reflects the strength of the heart muscle. The normal ejection fraction for the left ventricle is 50% to 60%. The heart muscle may be weakened from a heart attack, heart failure, or an infection. Any weakening of the heart muscle may lower the ejection fraction.
The heart has four chambers, the right and left atrium, and the right and left ventricle. Oxygen-poor blood from the body enters the right atrium, where it is delivered to the right ventricle to be pumped to the lungs to receive oxygen. Once the blood receives oxygen, it enters the left atrium, and is delivered to the left ventricle, which pumps it to the rest of the body. In the heart are four valves that prevent blood flowing backwards. Changes in the proper function of these valves can occur, causing related valvular disorders, such as mitral valve (the valve between the left atrium and left ventricle) prolapse (MVP). The aortic valve is responsible for preventing reverse blood flow so that blood leaves the left ventricle to enter the artery. The time between the opening of the aortic valve for release of blood from the left ventricle to closure of the valve is known as the left ventricular ejection time (LVET). With some diseases of the heart, the LVET may be reduced.
Immediately before a heart contraction there is a certain volume of blood within the ventricle. This is called the end-diastolic volume (EDV). After the contraction, there is a certain amount of blood left in the ventricle and this is called the end-systolic volume (ESV). The difference between these (EDV-ESV) is the stroke volume (SV). The ejection fraction (EF) is the SV divided by the EDV (SV/EDV), and is often expressed as a percentage, with normal values being 50-70%. EF can be defined as the amount of blood pumped by the heart into circulation with each heartbeat. Although EF can refer to either the left ventricle or the right ventricle, it is the left ventricular function that is more commonly investigated, because it is the left ventricle that pumps the blood to the body.
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Ejection fraction is the amount of blood released during each contraction of the lower ventricle of the heart. It is usually expressed as a percentage: an ejection fraction of 60% means that 60% of the total amount of blood in the left ventricle is expelled with each heartbeat.
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%.
- A heart 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%.
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