Publication

Influence of Measurement Location on Reflectance Pulse Oximetry in Sleep Apnea Patients: Wrist vs. Upper Arm

Journal Paper/Review - Nov 1, 2021

Units
PubMed
Doi

Citation
Braun F, Ferrario D, Brutsche M, Annaheim S, Bösch M, Baty F, Proust Y, Proenca M, Theurillat P, Bonnier G, Lemay M. Influence of Measurement Location on Reflectance Pulse Oximetry in Sleep Apnea Patients: Wrist vs. Upper Arm. Annu Int Conf IEEE Eng Med Biol Soc 2021; 2021:1297-1300.
Type
Journal Paper/Review (English)
Journal
Annu Int Conf IEEE Eng Med Biol Soc 2021; 2021
Publication Date
Nov 1, 2021
Issn Electronic
2694-0604
Pages
1297-1300
Brief description/objective

Peripheral oxygen saturation (SpO2) plays a key role in diagnosing sleep apnea. It is mainly measured via transmission pulse oximetry at the fingertip, an approach less suited for long-term monitoring over several nights.In this study we tested a more patient-friendly solution via a reflectance pulse oximetry device. Having previously observed issues with pulse oximetry at the wrist, we investigated in this study the influence of the location of our device (upper arm vs. wrist) to measure SpO. Accuracy was compared against state-of-the-art fingertip SpO measurements during a full overnight polysomnography in nine patients with suspected sleep apnea.The upper arm location clearly showed a lower root mean square error ARMS = 1.8% than the wrist ARMS = 2.5% and a lower rate of automatic data rejection (19% vs 25%). Irrespective of the measurement location the accuracies obtained comply with the ISO standard and the FDA guidance for pulse oximeters. In contrast to the wrist, the upper arm location seemed to be more resilient to deteriorating influences such as venous blood.Reflectance pulse oximetry at the wrist remains challenging but the upper arm could provide remedy for more robust SpO estimates to reliably screen for sleep apnea and other diseases.Clinical Relevance- The performance of reflectance pulse oximetry measured at the upper arm during sleep is superior to measurements at the wrist which are perturbed by undesired large fluctuations suspected to be caused by venous blood. If confirmed, this could also apply to the optical measurement of other vital signs such as blood pressure.