Friday, February 17, 2017

E/e' ratio,

E/e' ratio

E/e´ ratio

To derive the E/e´ ratio one must divide the maximum velocity of the E-wave of mitral valve inflow by the maximal velocity of E. In normal individuals the E/e´ ratio is <8. In the presence of diastolic dysfunction / impaired relaxation, e´ will be rather low. In contrast, the E-wave increases with elevated filling pressures. Thus the E/e´ ratio will increase in the presence of diastolic dysfunction.

 An E/e´ratio >15 is highly suggestive of elevated filling pressures.

The ratio may be employed to directly estimate filling pressure by using the following formula:

Mitral Inflow — Reference values

16- 20 years21- 40 years41- 60 years> 60 years
IVRT (ms)50 ± 967 ± 874 ± 787 ± 7
DT (ms)142 ± 19166 ± 14181 ± 19200 ± 29
A duration113 ± 17127 ± 13133 ± 13138 ± 19
E/A1.88 ± 0.451.53 ± 0.41.28 ± 0.250.96 ± 0,18
Table of normal values/Ranges for individual patterns of diastolic dysfunction


Ref:
https://123sonography.com/ebook/assess-diastolic-function

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