Abstract
IMPEDANCE plethysmography is a method of measuring the resistive impedance of a limb segment. Nyboer1 pointed out that the resistive impedance variation ΔR during the heart cycle is proportional to the blood volume ΔV transiently stored in the segment 
where ρ is the blood resistivity, l the length of the segment and R0 the mean steady value of the segment resistance. Nyboer1 proposed a method of calculating the blood flow by extrapolating the post-systolic slope of the plethysmogram. This procedure is subject to some criticisms and may lead to wrong results.
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References
Nyboer, J., Med. Phys., 2, 736; ibid., 3, 459 (The Year Book Publishers, Chicago, 1960).
Womersley, J. R., Phil. Mag., 46, 199 (1955).
McDonald, D. A., Blood Flow in Arteries, 181 (E. Arnold, London, 1960).
McDonald, D. A., Blood Flow in Arteries, 194 (E. Arnold, London, 1960).
McDonald, D. A., Blood Flow in Arteries, 175 (E. Arnold, London, 1960).
King, A. L., Med. Phys., 2, 188 (The Year Book Publishers, Chicago, 1960).
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BECATTINI, U., CORTE, M. Meaning of Impedance Plethysmography. Nature 213, 1237–1238 (1967). https://doi.org/10.1038/2131237a0
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DOI: https://doi.org/10.1038/2131237a0
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