Computer simulation of left ventricular filling flow: impact study on echocardiograms

Author

Vierendeels, J.A. ; Riemslagh, K. ; Dick, E. ; Verdonck, P.

Author_Institution

Inst. Biomed. Technol., Ghent Univ., Belgium

fYear

1999

fDate

6/21/1905 12:00:00 AM

Firstpage

177

Lastpage

180

Abstract

A 2D axisymmetrical computer model is developed describing left ventricular (LV) flow during filling. The unsteady Navier-Stokes equations in a LV geometry with moving walls are solved. The relaxation and compliance of the LV wall and the fluid-wall interaction are taken into account. The method is used to simulate the filling of a canine heart. The computed results show intraventricular flow and pressure patterns during filling. From a calculated colour M-mode Doppler echocardiogram, it can be seen that both early and atrial filling waves travel from base to apex. The maximal blood velocity during the early filling wave is 70 cm/s and the propagation velocity of the filling wave which corresponds with the propagation of a ring vortex, is 45 cm/s. The ratio is 1.56. Slower relaxation and higher LV stiffness result in a slower wave propagation

Keywords

Doppler measurement; Navier-Stokes equations; cardiovascular system; digital simulation; echocardiography; haemodynamics; image colour analysis; medical image processing; physiological models; 2D axisymmetrical computer model; 45 cm/s; 70 cm/s; LV geometry; LV wall; atrial filling waves; canine heart; colour M-mode Doppler echocardiogram; compliance; computer simulation; early filling wave; echocardiograms; fluid-wall interaction; higher LV stiffness; impact study; intraventricular flow; left ventricular filling flow; maximal blood velocity; moving walls; pressure patterns; propagation velocity; relaxation; ring vortex; slower wave propagation; unsteady Navier-Stokes equations; Blood; Computational modeling; Computer simulation; Deformable models; Filling; Fluid dynamics; Geometry; Heart; Stress; Valves;

fLanguage

English

Publisher

ieee

Conference_Titel

Computers in Cardiology, 1999

Conference_Location

Hannover

ISSN

0276-6547

Print_ISBN

0-7803-5614-4

Type

conf

DOI

10.1109/CIC.1999.825935

Filename

825935