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Articles in PresS, published online ahead of print March 28, 2002
Am J Physiol Heart Circ Physiol, 10.1152/ajpheart.01050.2001
Submitted on November 30, 2001
Accepted on March 22, 2002
1 U460, INSERM, Paris, France, Metropolitan
2 U460, INSERM, Paris, France, Metropolitan; Dartment of Physiology, AP-HP, Paris, France, Metropolitan
3 U426, INSERM, Paris, France, Metropolitan
* To whom correspondence should be addressed. E-mail: jjmercadier{at}wanadoo.fr.
The spectral Doppler mitral flow pattern, alone or combined with tissue Doppler mitral annulus velocity, can be used to predict left ventricular (LV) filling pressure in humans, whereas invasive hemodynamic measurements are still required in the rat. This study was undertaken to assess whether LV end diastolic pressure (LVEDP) can be estimated using Doppler echocardiography in the rat following myocardial infarction (MI). 37 rats (23 with MI after left coronary artery ligation and 14 sham-operated) were evaluated 3 months after surgery with echo-Doppler and invasive hemodynamic measurements. Pulse wave spectral Doppler at the mitral valve tip was used to measure the E-wave, the E-wave deceleration time (DT), and the A wave; spectral Doppler tissue imaging (DTI) was used to measure early diastolic lateral mitral annulus velocity (Ea). We found weak correlations between LVEDP and E, E/A and DT, and strong correlations with Ea and especially with E/Ea (R2=0.89, LVEDP (mmHg) = 0.99 E/Ea - 4.23). Longitudinal follow-up of a subgroup of rats with myocardial infarction revealed a marked rise of E/Ea between day 7 and 21 in rats with heart failure only. We conclude that Doppler echocardiography can be used for serial assessment of LV diastolic function in rats with MI.
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