N.N.Kizilova Investigation of pressure-flow relations and the parameters of the forward and backward pressure waves in arterial beds |
Acoustic bulletin, Vol. 7 ¹ 1, (2004) |
| Wave motion of a viscous incompressible liquid in model of the intraorgan arterial bed consisting of thin long viscoelastic tube conneced in series with terminal element, characterized by complex wave conductivity, is investigated. In the frameworks of an axysymmetrical model of wave motion of the liquid in the thick-walled cylindrical tube the expressions for the pressure and volume flow waves are obtained. For equations averaged over the tube cross-section the expressions for the Riemann invariants and intensities of the forward and backward compression and expansion waves are obtained. After comparison of the numerical results the biomechanical interpretation for pressure-flow dependence and the parameters of the forward and backward waves are developed. The important diagnostic parameters, allowing to estimate the blood circulation conditions in the viscus after the results of pressure and flow measurements in feeding artery, are determined. Wave picture is analyzed after pressure and flow variation in aorta and pulmonary arteries. Obtained results can be used for developing the novel non-invasive diagnostic techniques of viscera state estimation. |
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KEY WORDS: model of the intraorgan arterial bed, terminal element, the Riemann invariants, intensities of the forward and backward compression and expansion waves, non-invasive diagnostic techniques |
| TEXT LANGUAGE: Russian |