EVALUATION OF THE INFLUENCE OF MOVEMENT ON SATURATION READINGS FROM PULSE OXIMETERS

This study aimed to develop a protocol for assessing the influence of movement on oxyhaemoglobin saturation readings from pulse oximeters. T hirty-six volunteers took part in the study. In each volunteer, each h and was monitored by both a Nellcor N200 oximeter using a disposable p robe and by a Datex Satlite DS103 oximeter using a clip-on finger prob e. Volunteers made five standardised movements during which output was recorded from all four oximeters. All movements were associated with apparent decreases in oxyhaemoglobin saturation which were statistical ly significant for two movements with the Nellcor equipment and for fo ur movements with the Datex equipment. Movement was associated with in creases in the magnitude of pulse amplitude, but this was not quantita tively associated with magnitude of artefactual changes in saturation. Use of this standardised movement protocol allows quantification of m ovement artefact from pulse oximeters and should facilitate the develo pment of equipment less affected by movement.