Abstract DIGITAL pulse volume studies have proved of great value in the study of the peripheral circulation. The methods most commonly used have the disadvantage that they necessitate placing the digit in an airtight or watertight cylindrical compartment. In most of them the tracings are recorded on photographic paper, and analysis of data must wait until the film is developed. The present study is concerned with a method of recording pulse volume changes by alterations in electrical impedance of the digit under study. This method requires only the attachment of electrodes to the digit and utilizes a direct-writing recorder. The biophysical background of tissue impedance and impedance plethysmography has been summarized extensively by Nyboer and his associates.1 Impedance plethysmograms are recordings of variations in the electrical resistance and reactance of segments of the body to intermediate and high frequency alternating currents. The impedance pulse tracings reflect the mechanical pulse volume References 1. (a) Nyboer, J.: Impedance Plethysmograph: Medical Physics , Ed. 2, Chicago, Year Book Publishers, Inc., 1950. 2. (b) Nyboer, J.; Kreider, M., and Hannapel, L.: Quantitative Studies of Electrical Conductivity of the Peripheral Body Segments , Ann. West. Med. & Surg. 5:11, 1951. 3. (c) Nyboer, J.; Kreider, M., and Hannapel, L.: Electrical Impedance Plethysmography , Circulation 2:811, 1950. 4. A more detailed comparison of synchronous tracings of mechanical and impedance pulse waves is beautifully illustrated in one of Nyboer's publications.1a 5. Goodyer, A. V. N.: Observations on the Impedance Plethysmograph , J. Clin. Invest. 27:356, 1948. 6. Dubois, D., and Nims, L. F.: An Improved Impedance Plethysmograph, Report 149, OSRD, Committee on Aviation Medicine, National Research Council, June 1945. 7. Nyboer.1b,c 8. White, H. L.: Measurement of Cardiac Output by a Continuously Recording Conductivity Method , Am. J. Physiol. 151:45, 1947. 9. Freeman, L. W.; Shumacker, H. B., Jr., and Radigan, L. R.: A Functional Study of Afferent Fibers in Peripheral Sympathetic Nerves , Surgery 28:274, 1950.
A.M.A. Archives Surgery – American Medical Association
Published: Oct 1, 1952
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