What is an Ejection Fraction?
Ejection fraction refers to the percentage of stroke volume to the end-diastolic volume. The normal value is 50-70%. It can be checked by color Doppler ultrasound. It is one of the important indicators to judge the type of heart failure. The ventricular ejection fraction refers to the ratio of ventricular stroke volume to the end-diastolic volume of the ventricle. The calculation formula is: EF = (EDV-ES) * 100% / EDV, where EF is the ejection fraction; EDV is end-ventricular diastole Volume; ES is the end-ventricular volume. It can be seen from the formula that the ejection fraction is an index of volume ratio, which reflects the ejection function of the ventricle from the perspective of volume.
Ejection fraction
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- Chinese name
- Ejection fraction
- Foreign name
- Ejection Fractions
- Application
- Medical
- Meaning
- Ejection fraction refers to the percentage of stroke volume to the end-diastolic volume. The normal value is 50-70%. It can be checked by color Doppler ultrasound. It is one of the important indicators to judge the type of heart failure. The ventricular ejection fraction refers to the ratio of ventricular stroke volume to the end-diastolic volume of the ventricle. The calculation formula is: EF = (EDV-ES) * 100% / EDV, where EF is the ejection fraction; EDV is end-ventricular diastole Volume; ES is the end-ventricular volume. It can be seen from the formula that the ejection fraction is an index of volume ratio, which reflects the ejection function of the ventricle from the perspective of volume.
- [Pinyin] shè xuè fn shù
- [] Ejection fraction
- [English] Ejection Fractions
- Left Ventricular Ejection Fraction, LVEF (Left Ventricular Ejection Fractions), refers to the percentage of stroke volume to end-diastolic volume. When the ventricle contracts, the ventricular blood cannot be fully injected into the arteries. In a normal adult resting state, the volume of the ventricular diastole: about 125mL in the left ventricle, about 137mL in the right ventricle, and the ejection volume is 60-80mL. At the end of the ventricle, there is still a certain amount of residual blood. The percentage of pulsatile volume in the diastolic volume of the ventricle is called the ejection fraction. Generally, more than 50% belongs to the normal range. The ejection fraction when the human body is quiet is about 55% ~ 65%. The ejection fraction is related to the myocardial contractility. The stronger the myocardial contractility, the greater the stroke volume and the greater the ejection fraction.
- Under normal circumstances, the left ventricular ejection fraction is 50%; the right ventricular ejection fraction is 40%. If it is less than this value, it means cardiac insufficiency.