EXPERIMENTAL STUDY
Hemodynamic determinants of the mitral annulus diastolic velocities by tissue Doppler
Sherif F. Nagueh, MD, FACCa,
Huabin Sun, MDa,
Helen A. Kopelen, RDMSa,
Katherine J. Middleton, RCTa and
Dirar S. Khoury, PhDa
a Department of Medicine, Cardiology Section, Baylor College of Medicine, Houston, Texas, USA
Manuscript received April 17, 2000;
revised manuscript received August 9, 2000,
accepted September 14, 2000.
Reprint requests and correspondence: Dr. Sherif F. Nagueh, 6550 Fannin Street, SM-1246, Houston, Texas 77030 sherifn{at}bcm.tmc.edu
OBJECTIVES
Our goal was to identify the hemodynamic determinants of the mitral annulus (MA) diastolic velocities by tissue Doppler.
BACKGROUND
The MA diastolic velocities are promising indexes of left ventricular (LV) diastolic function. However, their hemodynamic determinants have not yet been evaluated.
METHODS
Ten adult mongrel dogs underwent left atrial (LA) and LV pressure measurements by Millar catheters while tissue Doppler was applied to record the MA diastolic velocities at the septal and lateral corners. Conventional transmitral flow was also obtained. Left atrial and LV pressures were modified utilizing fluid administration and caval occlusion, whereas dobutamine and esmolol were used to change LV and LA relaxation. Left ventricular filling pressures were altered during different lusitropic states to evaluate for the possible interaction of preload and LV relaxation on the early diastolic velocity (Ea).
RESULTS
In the majority of dogs, a positive significant relation was observed between Ea and the transmitral pressure gradient (r = 0.57, p = 0.04). The Ea had strong correlations with tau (r = 0.83, p < 0.001), LV dP/dt (r = 0.8, p < 0.001) and minimal LV pressure (r = 0.76, p < 0.01). However, there was no relation between Ea and the transmitral pressure gradient in experimental stages where tau >50 ms. Furthermore, the late diastolic velocity at both corners of the MA had significant positive relations with LA dP/dt (r = 0.67, p < 0.01) and LA relaxation (r = 0.73, p < 0.01) but an inverse correlation with LV end-diastolic pressure (r = 0.53, p = 0.01).
CONCLUSIONS
Left ventricular relaxation, minimal pressure and preload determine Ea while late diastolic velocity determinants include LA dP/dt, LA relaxation and LV end-diastolic pressure.
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Abbreviations and Acronyms
| | Aa | = late diastolic annular velocity | | Ea | = early diastolic annular velocity | | EDP | = end-diastolic pressure | | LA | = left atrial | | LV | = left ventricular | | MA | = mitral annulus | | SV | = stroke volume | | tau | = time constant of LV relaxation | | TD | = tissue Doppler |
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