Effects of vascular properties on the impedance spectra of systemic circulation
作者:
Chao‐Wang Chen,
Yio‐WhaR. Shau,
Chien‐Ping Wu,
期刊:
Journal of the Chinese Institute of Engineers
(Taylor Available online 1996)
卷期:
Volume 19,
issue 4
页码: 439-449
ISSN:0253-3839
年代: 1996
DOI:10.1080/02533839.1996.9677807
出版商: Taylor & Francis Group
关键词: impedance spectra;four‐tube viscoelastic model;systemic circulation
数据来源: Taylor
摘要:
A viscoelastic four‐tube arteries—micro‐vessels—veins model has been built using transmission line network. Hemodynamic data from literature are used in the fluid‐circuit analogic model. The predicted input impedance spectra agree reasonably well with the published measurements. Parametric analysis shows that the changes in the vascular properties in different portions of the body cause fluctuations of the maxima or minima of the impedance spectrum. In general, the changes of vascular properties in the lower body affect the first minimum, and the changes in the upper body influence the second minimum. Decreasing capacitances (i.e., increasing arterial stiffness due to aging), reducing the lumen area, or decreasing the length of blood vessels result in an increase of the impedance modulus, and the shift of the first minimum to a higher frequency, which agree well with experiments. The changes of peripheral resistances of all terminations affect the magnitude of impedance modulus maxima only. The current model uses simple physiological data directly; it can be used to simulate the effect of pharmacologic manipulation on the impedace spectra of the patients.
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