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KMID : 0390619980060020145
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Journal of Cardiovascular Ultrasound
1998 Volume.6 No. 2 p.145 ~ p.151
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Clinical Utility of Mitral Annulus Velocity to Estimate Left Ventricular Filling Pressure.
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Kim Yong-Jin
Sohn Dae-Won
Oh Byung-Hee
Lee Myoung-Mook
Park Young-Bae
Choi Yun-Shik
Lee Young-Woo
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Abstract
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Background: Early mitral inflow velocity(E) corrected for the influence of LV relaxation could give information about LV filling pressure. Early diastolic mitral annulus velocity(E’) is a relatively load independent parameter reflecting LV relaxation. Therefore, correction for the influence of LV relaxation could be done with the ratio of early mitral inflow velocity to early mitral annulus velocity(E/E’). The aim of this study was to investigate the clinical utility of E/E’ ratio in a large number of patients.
Methods: Simultaneous left ventricular pressure measurements and Doppler examinations were performed in 200 consecutive patients at the cardiac catheterization laboratory.
Results: E/E’ ratio correlated well with pre-A pressure(r=0.74, p<0.001) regardless of LV systolic function(EF> or =50%; r=0.74, p<0.001 vs EF<50%; r=0.70, p<0.001). E/E’ ratio of 9 best predicted the elevated(>12mmHg) pre-A pressure with the sensitivity of 81% and specificity of 80%. LV pre-A pressure could be estimated with the simplified equation of [pre-A pressure=E/E’+4].
Conclusions: E/E’ ratio is useful in the estimation of LV filling pressure and in contrast to the conventional parameters, it is not dependent on the left ventricular systolic function.
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KEYWORD
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Mitral annulus velocity, Left ventricular filling pressure.
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