Effects of oscillation on the arteries measured by arterial impedance during left ventricular assistance

Oscillating blood flow has effects on the arteries similar to the effects of pulsatile blood flow at lower frequencies. Alternating-current theory is useful to study the pulse in the circulatory system. Arterial impedance is a good index to estimate the frequency characteristics of the artery. In th...

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Bibliographic Details
Published in:	Journal of artificial organs Vol. 2; no. 1; pp. 8 - 12
Main Authors:	Kobayashi, Shinichi, Ohwada, Naoki, Yambe, Tomoyuki, Nanka, Syunsuke, Nitta, Shinichi, Fukuju, Takeo, Hongou, Tadayoshi, Hashimoto, Hiroyuki
Format:	Journal Article
Language:	English
Published:	Tokyo Springer Nature B.V 01-03-1999
Subjects:	Veins & arteries
Online Access:	Get full text
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Summary:	Oscillating blood flow has effects on the arteries similar to the effects of pulsatile blood flow at lower frequencies. Alternating-current theory is useful to study the pulse in the circulatory system. Arterial impedance is a good index to estimate the frequency characteristics of the artery. In this study, total vascular resistance and arterial impedance were studied in animal experiments during left ventricular assistance. A centrifugal pump was used for comparison with a VFP (vibrating-flow pump). Left ventricular assistance was performed in animal experiments using goats. Total vascular resistance and arterial impedance were studied to estimate the frequency characteristics of the artery. Total vascular resistance during steady flow assistance decreased compared with that during nonassistance. Arterial walls were extended by the blood flow assistance at steady flow. The resistance during oscillating blood flow was different at each driving frequency, showing the frequency dependency, or pulse effect, of the arterial system under nonsteady flow. Arterial impedance was also studied during oscillating blood flow and showed a slight increase at a driving frequency of 25 or 30 Hz. These fluctuations in impedance are influenced by the reflection of the pulse. Arterial impedance should be taken into consideration when analyzing pulsatile blood flow because the pulse reflection may have some effects on the arterial wall. Some variation of blood pressure and blood flow might be necessary for stable support with artificial circulatory assistance.[PUBLICATION ABSTRACT]
ISSN:	1434-7229 1619-0904
DOI:	10.1007/BF01235518