Finger blood content, light transmission, and pulse oximetry errors

Finger blood content, light transmission, and pulse oximetry errors

The changes in light emitting diode current necessary to maintain a constant level of light incident upon a photodetector were measured in 20 volunteers at the two wavelengths employed by pulse oximeters. Three states of finger blood content were assessed; exsanguinated, hyperaemic, and normal. The...

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Bibliographic Details
Published in:Anaesthesia Vol. 47; no. 1; p. 52
Main Authors: Craft, T M, Lawson, R A, Young, J D
Format: Journal Article
Language:English
Published: England 01-01-1992
Subjects:
Anemia - blood
Equipment Failure
Fingers - blood supply
Humans
Light
Oximetry - instrumentation
Oximetry - standards
Oxygen - blood
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Summary:The changes in light emitting diode current necessary to maintain a constant level of light incident upon a photodetector were measured in 20 volunteers at the two wavelengths employed by pulse oximeters. Three states of finger blood content were assessed; exsanguinated, hyperaemic, and normal. The changes in light emitting diode current with changes in finger blood content were small and are not thought to represent a significant source of error in saturation as measured by pulse oximetry.
ISSN:0003-2409
DOI:10.1111/j.1365-2044.1992.tb01955.x