Wave intensity analysis (WIA) is a powerful technique to study pressure and flow velocity waves in the time domain in vascular networks. The method is based on the analysis of energy transported by the wave through computation of the wave intensity , where and denote pressure and flow velocity changes per time interval, respectively. In this study we propose an analytical modification to the WIA so that it can be used to study waves in conditions of time varying elastic properties, such as the left ventricle (LV) during diastole. The approach is first analytically elaborated for a one-dimensional elastic tube-model of the left ventricle with a time-dependent pressure-area relationship. Data obtained with a validated quasi-three dimensional axisymmetrical model of the left ventricle are employed to demonstrate this new approach. Along the base-apex axis close to the base wave intensity curves are obtained, both using the standard method and the newly proposed modified method. The main difference between the standard and modified wave intensity pattern occurs immediately after the opening of the mitral valve. Where the standard WIA shows a backward expansion wave, the modified analysis shows a forward compression wave. The proposed modification needs to be taken into account when studying left ventricular relaxation, as it affects the wave type.
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e-mail: Lieve.Lanoye@UGent.be
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October 2005
Technical Briefs
Wave Intensity Analysis of Left Ventricular Filling
L. L. Lanoye,
L. L. Lanoye
Hydraulics Laboratory, Institute of Biomedical Technology,
e-mail: Lieve.Lanoye@UGent.be
Ghent University
, Belgium
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J. A. Vierendeels,
J. A. Vierendeels
Department of Flow, Heat and Combustion Mechanics,
Ghent University
, Belgium
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P. Segers,
P. Segers
Hydraulics Laboratory, Institute of Biomedical Technology,
Ghent University
, Belgium
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P. R. Verdonck
P. R. Verdonck
Hydraulics Laboratory, Institute of Biomedical Technology,
Ghent University
, Belgium
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L. L. Lanoye
Hydraulics Laboratory, Institute of Biomedical Technology,
Ghent University
, Belgiume-mail: Lieve.Lanoye@UGent.be
J. A. Vierendeels
Department of Flow, Heat and Combustion Mechanics,
Ghent University
, Belgium
P. Segers
Hydraulics Laboratory, Institute of Biomedical Technology,
Ghent University
, Belgium
P. R. Verdonck
Hydraulics Laboratory, Institute of Biomedical Technology,
Ghent University
, BelgiumJ Biomech Eng. Oct 2005, 127(5): 862-867 (6 pages)
Published Online: March 24, 2005
Article history
Received:
March 1, 2004
Revised:
March 24, 2005
Citation
Lanoye, L. L., Vierendeels, J. A., Segers, P., and Verdonck, P. R. (March 24, 2005). "Wave Intensity Analysis of Left Ventricular Filling." ASME. J Biomech Eng. October 2005; 127(5): 862–867. https://doi.org/10.1115/1.1992534
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