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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.

Type

Journal article

Journal

Anaesthesia

Publication Date

01/1992

Volume

47

Pages

52 - 53

Keywords

Anemia, Equipment Failure, Fingers, Humans, Light, Oximetry, Oxygen