An unpredictable and possibly dangerous artefact affecting a pulse oximeter

Key wordsEquipment; pulse oximeter. Measurement.The performance and some potential errors of pulse oximeters under conditions of good and poor perfusion, and high and low saturation were reported before.'-5 This paper is a review of other potential errors and the clinical implications will be reviewed later.6 Effects of interferenceThe pulse oximeter signal can be corrupted by interference from ambient light, electromagnetic signals and motion. Emergency Care Research Institute (ECRI) tested 13 models of pulse oximeter for the effects of interference by electrosurgical units, phototherapy and surgical lamps, and shaking and ~i b r a t i o n .~ These results are summarised below and compared with other reports where possible. ElectrosurgeryElectrosurgical interference caused erroneous readings in six of the 13 units with no clear warning that the signal was unsatisfactory; three were unaffected and the rest displayed a clear interference warning signal. Interference can be reduced if the distance of the pulse oximeter probe from the surgical site is made as great as possible.

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Potential errors in pulse oximetry III: Effects of interference, dyes, dyshaemoglobins and other pigments*

Ralston

1991

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An unpredictable and possibly dangerous artefact affecting a pulse oximeter

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Potential errors in pulse oximetry III: Effects of interference, dyes, dyshaemoglobins and other pigments*

Potential errors in pulse oximetry III: Effects of interference, dyes, dyshaemoglobins and other pigments*

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