E/A ratio
E/A ratio
The E/A ratio (pronounced as "E over A ratio") is a significant term in the field of cardiology. It is a measurement used in echocardiography to assess the function of the left ventricle of the heart.
Pronunciation
- E/A ratio: /ˈiː əʊvər ˈeɪ ˈreɪʃiːoʊ/
Etymology
The term "E/A ratio" is an abbreviation of the terms "Early (E) to Atrial (A) ratio". The "E" stands for early filling phase of the left ventricle, while the "A" stands for atrial contraction phase.
Definition
The E/A ratio is a calculation of the early (E) and late (A) peak velocities of blood flow from the left atrium to the left ventricle. This ratio is used to evaluate the diastolic function of the heart, specifically the left ventricle. A normal E/A ratio is typically between 1.0 and 2.0. An E/A ratio less than 1.0 may indicate impaired relaxation of the left ventricle, while an E/A ratio greater than 2.0 may suggest restrictive filling.
Related Terms
- Diastolic function: The ability of the heart, specifically the left ventricle, to fill with blood between contractions.
- Echocardiography: A diagnostic test that uses ultrasound waves to create images of the heart.
- Left ventricle: The chamber of the heart responsible for pumping oxygenated blood to tissues all over the body.
- Atrial contraction: The contraction of the atria, the heart's upper chambers, which helps to fill the ventricles with blood.
See Also
External links
- Medical encyclopedia article on E/A ratio
- Wikipedia's article - E/A ratio
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