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. 2021 Jul 29;23(7):e24171. doi: 10.2196/24171

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©Zhongxing Zhang, Ming Qi, Gordana Hügli, Ramin Khatami. Originally published in the Journal of Medical Internet Research (https://www.jmir.org), 29.07.2021.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on https://www.jmir.org/, as well as this copyright and license information must be included.

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Typical oxygen desaturation (OD) at fingertip (finger_OD) and at arm (arm_OD) during hypopneas. Arrows indicate the degree of OD. SpO₂ is measured at the fingertip by polysomnography transmission photoplethysmography, and StO₂ is measured at the biceps muscle by frequency-domain multidistance near-infrared spectroscopy. SpO₂: peripheral capillary oxygen saturation; StO₂: peripheral tissue oxygen saturation.