Assessment of mitral regurgitation by the measurement of vena contracta using power doppler echocardiography

Nozaki, Shiro; Mizushige, Katsufumi; Taminato, Tomohiko; Matsuo, Hirohíde

doi:10.1007/s00547-004-1021-y

Cited by 2 publications

(1 citation statement)

References 29 publications

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“…Different methods have been introduced for evaluating MR. The vena contracta method 19 estimates the size of the regurgitant orifice by measuring the minimum diameter of the regurgitant blood jet; then, small measurement errors correspond to larger volumetric quantification errors, which represent a limitation given by a large inter- and intraoperator variability 24 . The Proximal Isosurface Velocity Area (PISA) method evaluates the MR volume based on the 2D Color-Doppler image of the converging flow proximal to the orifice, the velocity is shown with different colors, and the assumption of hemispheric converging flow allows estimating the flow rate based on the value of one isovelocity contour.…”

Section: Introductionmentioning

confidence: 99%

Analysis of mitral valve regurgitation by computational fluid dynamics

2019

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The clinical syndrome of mitral insufficiency is a common consequence of mitral valve (MV) prolapse, when the MV leaflets do not seal the closed orifice and blood regurgitates back to the atrium during ventricular contraction. There are different types of MV prolapse that may influence the degree of regurgitation also in relation to the left ventricle (LV) geometry. This study aims to provide some insight into the fluid dynamics of MV insufficiency in view of improving the different measurements available in the clinical setting. The analysis is performed by a computational fluid dynamics model coupled with an asymptotic model of the MV motion. The computational fluid dynamics solution uses the immersed boundary method that is efficiently integrated with clinical imaging technologies. Healthy and dilated LVs obtained by multislice cardiac MRI are combined with simplified models of healthy and pathological MVs deduced from computed tomography and 4D-transesophageal echocardiography. The results demonstrated the properties of false regurgitation, blood that did not cross the open MV orifice and returns into the atrium during the backward motion of the MV leaflets, whose entity should be accounted when evaluating small regurgitation. The regurgitating volume is found to be proportional to the effective orifice area, with the limited dependence of the LV geometry and type of prolapse. These affect the percentage of old blood returning to the atrium which may be associated with thrombogenic risk.

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Section: Introductionmentioning

confidence: 99%

Analysis of mitral valve regurgitation by computational fluid dynamics

2019

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Transthoracic and Transesophageal Echocardiographic Assessment of Mitral Regurgitation Severity: Usefulness of Qualitative and Semiquantitative Techniques

et al. 2005

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In this report, we review the advantages, limitations, and optimal utilization of various transthoracic and transesophageal echocardiographic (TTE and TEE) methods used for assessing mitral regurgitation (MR) as published in full-length, peer-reviewed articles since the color Doppler era began in 1984. In addition, comparison is made to other imaging modalities including catheter-based, magnetic resonance and surgical assessment of MR. Although left ventricular (LV) angiography has been traditionally used for validation of various TTE methods and is time-honored, its considerable limitations preclude it from being a real "gold standard." Based on the reviewed literature, no clear "gold standard" for the assessment of MR can be identified at present, but newly emerging TTE and TEE techniques, such as three-dimensional color Doppler, may have the potential to overcome some of the limitations of the two-dimensional methods.

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Assessment of mitral regurgitation by the measurement of vena contracta using power doppler echocardiography

Cited by 2 publications

References 29 publications

Analysis of mitral valve regurgitation by computational fluid dynamics

Analysis of mitral valve regurgitation by computational fluid dynamics

Transthoracic and Transesophageal Echocardiographic Assessment of Mitral Regurgitation Severity: Usefulness of Qualitative and Semiquantitative Techniques

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