COMPARISON OF PULSE OXIMETERS: EFFECTS OF VASOCONSTRICTION AND VENOUS ENGORGEMENT

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Abstract
The effects of cold-induced vasoconstriction and venous occlusion on the detection of induced hypoxaemia by four pulse oximeters were examined in 10 volunteers. In three further subjects vasoconstriction was maintained until at least one instrument failed to detect the induced hypoxaemia. Time taken to detect hypoxaemia was increased for all instruments to between two and three times the instrument's own control value for both vasoconstriction and venous engorgement (PPP<0.05). Significant impairment in the performance of all the instruments tested occurred in the presence of normal pulse signals. The duration of detected reductions in oxygen saturation was not significantly affected.

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