Impedance moduli in the presence of reflections can be used to study transmission characteristics like wave velocity and attenuation in physical arterial models.
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Questions standard explanations for arterial impedance deviations; leaves open identification of other factors in vascular transmission models.
A white noise method was used to measure the hydraulic input impedance and transmission characteristics in physical models of an arterial system made of single, unbranched latex tubes. The experimentally obtained impedance curves show a rise in modulus and a positive phase at high frequencies in the absence of wave reflections. Using the impedance moduli in the presence of wave reflections, wave velocity and attenuation were calculated. The influence of wall nonlinearity on hydraulic impedance was also examined. It is concluded that, in the model used neither wave reflections nor wall nonlinearity can account for the deviations of the experimental impedance curves from the theoretically predicted ones. Impedance moduli in the presence of reflections may be used to study transmission characteristics (wave velocity and attenuation) of the model.
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Papageorgiou et al. (1989) studied this question.
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