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Strain-gauge versus water plethysmography description of simplified systems and analysis of differences and accuracy

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Recently developed water and strain-gauge plethysmographs are compared on the same forearm. They do not differ systematically in absolute blood-flow values at different steady-state levels, provided that the strain gauge is applied at the middle, muscular, part of the forearm. The accuracy of the water and strain-gauge plethysmograph is identical, and the two instruments closely follow random variations in blood flow. The water plethysmograph is a reliable integrator of blood flow in a segment of a limb, and the strain-gauge described here can be used as an adequate substitute, when placed in the middle of the limb segment examined. However, the results from the strain-gauge plethysmograph are dependent on the actual location of the strain gauge.

OriginalsprogEngelsk
TidsskriftMedical & Biological Engineering
Vol/bind12
Udgave nummer4
Sider (fra-til)437-445
Antal sider9
ISSN0025-696X
DOI
StatusUdgivet - jul. 1974

ID: 202486068