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  • Smartwatch can detect...

Smartwatch can detect short-time hypoxemia compared to a medical-grade pulse oximeter

Medha BaranwalWritten by Medha Baranwal Published On 2023-01-12T20:00:32+05:30  |  Updated On 13 Jan 2023 10:41 AM GMT
Smartwatch can detect short-time hypoxemia compared to a medical-grade pulse oximeter

Czech Republic: A recent study in Digital Health has found that the Apple Watch Series 6 can accurately detect reduced levels of blood oxygen saturation (SpO2) below 90% compared to a medical-grade pulse oximeter."The technology used in this smartwatch is adequately advanced for the indicative SpO2 measurement outside the clinic and can detect states of reduced blood oxygen saturation,"...

Czech Republic: A recent study in Digital Health has found that the Apple Watch Series 6 can accurately detect reduced levels of blood oxygen saturation (SpO2) below 90% compared to a medical-grade pulse oximeter.

"The technology used in this smartwatch is adequately advanced for the indicative SpO2 measurement outside the clinic and can detect states of reduced blood oxygen saturation," the researchers wrote in their study.

Pulse oximetry as an indirect peripheral SpO2 measurement method is a relatively new metric in smartwatches. Still, it is becoming routinely available in new models, allowing convenient SpO2 monitoring at home or, with some restrictions due to movement obviating the need for a dedicated pulse oximeter. Additionally, the SpO2 sensor of the smartwatch does not need an attachment to a finger to complicate daily activities. This might help mountaineers in high altitudes or athletes in training, and patients with lung diseases such as COPD (chronic obstructive pulmonary disease), cardiovascular disease, or dealing with concerns or consequences of COVID-19. The ability of smartwatches, in particular, to measure SpO2 without conscious use intervention might help detect intermittent hypoxemia associated with sleep apnea.

Against the above background, Jakub Rafl, Czech Technical University in Prague, Kladno, Czech Republic, and colleagues explored how a commercially available smartwatch that measures peripheral blood oxygen saturation (SpO2) can detect hypoxemia compared to a medical-grade pulse oximeter.

For this purpose, 24 healthy participants were recruited. Each participant wore an Apple Watch Series 6 (smartwatch) on the left wrist and Masimo Radical-7 pulse oximeter sensor on the left middle finger. The people breathed via a breathing circuit with a three-way non-rebreathing valve in three phases. The people inhaled the ambient air in the first 2-minute initial stabilization phase. Then the participants breathed the oxygen-reduced gas mixture (12% O2) in the 5-minute desaturation phase, temporarily reducing their blood oxygen saturation. In the final stabilization phase, people inhaled the ambient air until SpO2 returned to normal. SpO2 measurements were simultaneously taken from the pulse oximeter and the smartwatch in 30-s intervals.

The study revealed the following findings:

  • There were 642 individual pairs of SpO2 measurements. The bias in SpO2 between the smartwatch and the oximeter was 0.0% for all the data points.
  • The bias for SpO2 less than 90% was 1.2%.
  • The differences in individual measurements between the smartwatch and oximeter within 6% SpO2 can be expected for SpO2 readings 90%–100% and up to 8% for SpO2 readings less than 90%.

"As a representative of wearables, Apple Watch Series 6 provides reliable values of SpO2 compared to a medical-grade pulse oximeter, at both normal and optimal levels and induced desaturation with SpO2 below 90%," the researchers wrote.

"In this smartwatch, the SpO2 monitoring technology used is sufficiently advanced for the indicative measurement of SpO2 outside the clinic and can detect states of reduced blood oxygen saturation", they concluded.

Reference:

Rafl J, Bachman TE, Rafl-Huttova V, Walzel S, Rozanek M. Commercial smartwatch with pulse oximeter detects short-time hypoxemia as well as standard medical-grade device: Validation study. DIGITAL HEALTH. 2022;8. doi:10.1177/20552076221132127

Digital Health smart watch Apple Watch hypoxemia pulse oximeter blood oxygen saturation SpO2 
Source : Digital Health
Medha Baranwal
Medha Baranwal

    MSc. Biotechnology

    Medha Baranwal joined Medical Dialogues as an Editor in 2018 for Speciality Medical Dialogues. She covers several medical specialties including Cardiac Sciences, Dentistry, Diabetes and Endo, Diagnostics, ENT, Gastroenterology, Neurosciences, and Radiology. She has completed her Bachelors in Biomedical Sciences from DU and then pursued Masters in Biotechnology from Amity University. She has a working experience of 5 years in the field of medical research writing, scientific writing, content writing, and content management. She can be contacted at  editorial@medicaldialogues.in. Contact no. 011-43720751

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