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Renal admittance plethysmography

Content Provider	IEEE Xplore Digital Library
Author	Marks, L.A. Anaise, D. Yland, M.
Copyright Year	1988
Description	Author affiliation: Dept. of Pediatrics, Temple Univ., Philadelphia, PA, USA (Marks, L.A.)
Abstract	It is shown that over a wide flow range, phasic changes in renal volume and the maximum rate of volume change may be reasonably predicted from changes in renal conductance using a model which assumes homogeneous geometric changes. However, the relationship deteriorates at high pump rates, stroke volumes, and therefore mean flow values. It is suggested that the expansion of the arteriolar bed occurring at the higher flow rates and stroke volumes causes a decrease in arteriolar compliance, which in turn causes a greater portion of the volume pulsation to be transmitted to the venous system, where the geometric assumptions may no longer be valid. The independent effect of rate is more difficult to explain. It may be due to a frequency resonance effect in which, at rates greater than the resonant frequency, the vascular bed remains at a greater state of expansion, again reducing arteriolar compliance and transmitting a greater portion of the volume pulsation to the venous system.<>
Starting Page	122
Ending Page	125
File Size	302872
Page Count	4
File Format	PDF
DOI	10.1109/NEBC.1988.19362
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1988-03-10
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Plethysmography Volume measurement Electrodes Fluid flow measurement Admittance measurement Conductivity measurement Voltage Heart Surgery Electromagnetic measurements
Content Type	Text
Resource Type	Article

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