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Proceedings Paper

In-vitro model for evaluation of pulse oximetry
Author(s): Magnus Vegfors; Lars-Goeran Lindberg; Claes Lennmarken; P. Ake Oberg
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Paper Abstract

An in vitro model with blood circulating in a silicon tubing system and including an artificial arterial bed is an important tool for evaluation of the pulse oximetry technique. The oxygen saturation was measured on an artificial finger using a pulse oximeter (SpO2) and on blood samples using a hemoximeter (SaO2). Measurements were performed at different blood flows and at different blood hematocrits. An increase in steady as well as in pulsatile blood flow was followed by an increase in pulse oximeter readings and a better agreement between SpO2 and SaO2 readings. After diluting the blood with normal saline (decreased hematocrit) the agreement was further improved. These results indicate that the pulse oximeter signal is related to blood hematocrit and the velocity of blood. The flow-related dependance of SpO2 was also evaluated in a human model. These results provided evidence that the pulse oximeter signal is dependent on vascular changes.

Paper Details

Date Published: 1 June 1991
PDF: 5 pages
Proc. SPIE 1426, Optical Methods for Tumor Treatment and Early Diagnosis: Mechanisms and Techniques, (1 June 1991); doi: 10.1117/12.44049
Show Author Affiliations
Magnus Vegfors, Linkoping Univ. Hospital (Sweden)
Lars-Goeran Lindberg, Linkoping Univ. Hospital (Sweden)
Claes Lennmarken, Linkoping Univ. Hospital (Sweden)
P. Ake Oberg, Linkoping Univ. Hospital (Sweden)

Published in SPIE Proceedings Vol. 1426:
Optical Methods for Tumor Treatment and Early Diagnosis: Mechanisms and Techniques
Thomas J. Dougherty, Editor(s)

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