Filling of a model left ventricle studied by colour M mode Doppler

Steen, Torkel; Steen, Sverre

doi:10.1093/cvr/28.12.1821

Cited by 69 publications

(48 citation statements)

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“…The numerical results (Vierendeels et al, 2000), as well as experimental ones (Steen & Steen, 1994), are in qualitative agreement between themselves and with clinical observations. A general picture of the diastolic fluid dynamics inside of the left ventricle can be given, at least for axisymmetric flows in normal (not pathologic) conditions.…”

Section: Introductionsupporting

confidence: 77%

“…An intriguing aspect of the left heart dynamics is the hypothesised occurrence of diastolic vortices within the ventricular chamber. Their presence and properties have been analyzed in theoretical (Reul et al, 1981;Wieting & Stripling, 1984), experimental (Steen & Steen, 1994), and numerical models (Vierendeels et al, 2000;Baccani et al, 2002 ), and introduced also in medical observations (Kim et al, 1994;Kim et al, 1995;ab Kilner et al, 2000). The presence of vorticity makes the fluid dynamics approach relevant for the understanding of the possible patterns and their relation with the mechanical properties of the surrounding tissues.…”

Section: Introductionmentioning

confidence: 99%

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Fluid Flow inside Deformable Vessels and in the Left Ventricle

Pedrizzetti

Domenichini

2003

Cardiovascular Fluid Mechanics

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Abstract. Topics regarding flow inside deformable domains are here considered either for artery and ventricle flows. The theory of finite elasticity is summarised in a perspective of application to fluid-tissue interaction problems. The formulation of a coupled fluid tissue problem is discussed. A linearized technique is then introduced as a model for wall elasticity in artery flow. This simplification transforms the coupled fluid-wall system into a cascade of uncoupled systems on a fixed domain. Computational examples are given in axisymmetric problems, for both finite and infinitesimal deformation cases, to show resonance and stability features of the interactive dynamics. The heart dynamics and the major ventricular diseases are briefly summarised in a mechanical perspective. The formulation of the flow in a model left ventricle is given, and numerical solutions for flow during the left ventricle filling (diastole) is studied and analysed in terms of vorticity dynamics. Results are also presented in relation to the physical phenomena observed in the clinical practice. In connection with this the mitral valve modelling is also introduced.

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Section: Introductionsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Fluid Flow inside Deformable Vessels and in the Left Ventricle

Pedrizzetti

Domenichini

2003

Cardiovascular Fluid Mechanics

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“…Phase II is the propagation of the maximum velocity that can be associated with the propagation of a vortex ring as described before. The biphasic filling pattern is observed in vitro [45] , in numero [46] and in vivo [30,41,49,50] .…”

Section: S De Mey Et Almentioning

confidence: 83%

“…The higher peak E-velocity, compared to v p , is observed in vitro and in numero [42][43][44][45][46] , and in vivo [47][48][49] .…”

Section: Travelling Vortices and Colour M-mode Doppler Echocardiograpmentioning

confidence: 83%

“…the fact that propagation speed of the vortex ring equals the propagation speed of the maximum velocity, was a key observation. Steen et al [45] , using a hydraulic model, were the first to realize that the travelling speed of a vortex ring in the left ventricle could therefore be associated with the v p obtained from a colour M-mode Doppler image. This concept is illustrated in Fig.…”

Section: Travelling Vortices and Colour M-mode Doppler Echocardiograpmentioning

confidence: 99%

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Diastolic Filling and Pressure Imaging: Taking Advantage of the Information in a Colour M-mode Doppler Image

Mey

Sutter

Vierendeels

et al. 2001

European Journal of Echocardiography

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The ability to derive non-invasively information on left ventricular diastolic function on one hand and pressure gradients on the other hand, makes Doppler ultrasound a very attractive tool in clinical practice. However, the limitations of the standard Doppler approaches in differentiating between normal and pseudonormal filling patterns, together with the limitations of the simplified Bernoulli equation for assessing pressure gradients, are well described. In this manuscript the role of colour M-mode Doppler echocardiography as a tool that can overcome these limitations is discussed. Relevant key concepts of the haemodynamics of left ventricular filling and its relationship with colour M-mode Doppler echocardiography are introduced.

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Fluid-Structure Interaction Modelling of Left Ventricular Filling

Verdonck

Vierendeels²

2002

Lecture Notes in Computer Science

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Non-invasive diagnosis of diastolic dysfunction remains difficult in clinical practice. Non-invasive assessment of the flow field within the left ventricle (LV) using color M-mode Doppler (CMD) echocardiography provides a potential technique that can differentiate between the normal and diseased heart. A computer model is developed describing three-dimensional axi-symmetrical LV filling flow. The simulation results show that the hydrodynamical mechanism of LV flow wave propagation, as observed on 2D color and color M-mode Doppler echocardiograms, is the propagation of a vortex in the LV cavity.

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Filling of a model left ventricle studied by colour M mode Doppler

Abstract: The two phases of the filling pattern represented the motion of a blood column and the propagation of a ring vortex, respectively. Mitral orifice size determined which phase dominated the flow pattern.

Cited by 69 publications

References 0 publications

Fluid Flow inside Deformable Vessels and in the Left Ventricle

Fluid Flow inside Deformable Vessels and in the Left Ventricle

Diastolic Filling and Pressure Imaging: Taking Advantage of the Information in a Colour M-mode Doppler Image

Fluid-Structure Interaction Modelling of Left Ventricular Filling

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