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Regional Pulse Volume and Perfusion Flow MeasurementElectrical Impedance Plethysmography
JAN NYBOER, D.Sc., M.D.
AMA Arch Intern Med. 1960;105(2):264-276.
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Pulse volume and changes in perfusion flow pertaining to a segment such as the arm or leg may easily be followed by radiofrequency impedance plethysmography. Volume varies directly with electrical conductance and inversely as the resistive electrical impedance of the conductor.
The method is sketched briefly in Figure 1 and defined in its legend. Thus, we propose by this type of study (1) to measure pulse volume and blood flow on the basis of electrical properties of tissue and blood; (2) to calculate pulse volume and blood flow from such electrical data, and (3) to apply the electrical impedance method to physiological and clinical flow problems.
Electrical impedance to radiofrequency current through tissues is capacitative as well as resistive in nature. The former is less than three per cent of the latter in value and may be regarded as insignificant when volume pulses are derived from the limbs. A
. . . [Full Text PDF of this Article]
Author Affiliations
Detroit
From the Departments of Cardiovascular Physiology and Medicine, Harper Hospital, and the Department of Physiology and Pharmacology, Wayne State University Medical School.
Footnotes
This report is written at the request of the editor and is based in part on a recent exhibit at the 1959 American Medical Association Convention at Atlantic City. It was entitled "Pulse Volume and Blood Volume Flow from Electrical Conductance: Radio-Frequency Plethysmography" by Jan Nyboer, M.D. and Alan Baker, B.A. This exhibit received a certificate of honorable mention in the section on Internal Medicine.
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