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Research ArticleOriginal Research

Reliability of Smartphone Pulse Oximetry in Subjects at Risk for Hypoxemia

Aashna M Modi, Renee D Kiourkas, Jie Li and J Brady Scott
Respiratory Care March 2021, 66 (3) 384-390; DOI: https://doi.org/10.4187/respcare.07670
Aashna M Modi
Respiratory Care Services, Rush University Medical Center, Chicago, Illinois.
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Renee D Kiourkas
Respiratory Care Services, Rush University Medical Center, Chicago, Illinois.
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Jie Li
Department of Cardiopulmonary Sciences, Division of Respiratory Care, Rush University, Chicago, Illinois.
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J Brady Scott
Department of Cardiopulmonary Sciences, Division of Respiratory Care, Rush University, Chicago, Illinois.
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  • For correspondence: [email protected]
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Abstract

BACKGROUND: Pulse oximeters are used to measure Embedded Image and pulse rate. These devices are either standalone machines or integrated into physiologic monitoring systems. Some smartphones now have pulse oximetry capabilities. Because it is possible that some patients might utilize this technology, we sought to assess the accuracy and usability of smartphone pulse oximeters.

METHODS: This was a prospective, observational study that involved noninvasive measurements of Embedded Image and heart rate with 3 devices: Masimo Radical-7, Kenek Edge with the Apple iPhone 6S, and the Samsung S8 smartphone. Ambulatory adult patients visiting our institution’s pulmonary function lab for a 6-min walk test were eligible to participate in the study. Pretest and posttest results for each subject were obtained simultaneously using all 3 devices. All results were analyzed with the Spearman rho correlation test, and Bland-Altman plots were used to assess the agreement of measures between the devices.

RESULTS: Forty-seven subjects were enrolled in the study, with pulmonary hypertension (30%) and COPD (23%) being the 2 major diagnoses. The mean ± SD difference between the Masimo and Apple devices for pretest Embedded Image was 2.3 ± 2.4%, and the difference for posttest Embedded Image was 2.1 ± 3.9%. The mean difference between the Masimo and Samsung devices for pretest Embedded Image was 3.2 ± 2.8%, and the difference for posttest Embedded Image was 2.4 ± 3.5%. The number of subjects who were unable to obtain Embedded Image was higher with the Samsung device than with the Apple device in both pretest (14 of 47 vs 3 of 47) and posttest (17 of 47 vs 5 of 47). In contrast, the Masimo device was able to measure Embedded Image in all subjects.

CONCLUSIONS: Smartphone pulse oximeters were unreliable compared to a hospital pulse oximeter. Further research is needed with evolving technology to better understand smartphone pulse oximetry. (ClinicalTrials.gov registration NCT03534271.)

  • smartphone
  • heart rate
  • SpO2
  • hypoxemia
  • 6-min walk test
  • monitoring
  • pulse oximetry

Footnotes

  • Correspondence: J Brady Scott MSc RRT RRT-ACCS AE-C FAARC, Rush University, Department of Cardiopulmonary Sciences, Division of Respiratory Care, Armour Academic Center, 600 S Paulina St, Suite 751, Chicago, IL 60607. E-mail: jonathan_b_scott{at}rush.edu
  • Mr Scott presented a version of this paper as an Editors’ Choice abstract at AARC Congress 2019, held November 9–12, 2019, in New Orleans, Louisiana.

  • Mr Scott discloses relationships with Ventec Life Systems and Teleflex. Dr Li discloses a relationship with Fisher & Paykel. Ms Modi and Ms Kiourkas have disclosed no conflicts of interest.

  • Copyright © 2021 by Daedalus Enterprises
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Respiratory Care: 66 (3)
Respiratory Care
Vol. 66, Issue 3
1 Mar 2021
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Reliability of Smartphone Pulse Oximetry in Subjects at Risk for Hypoxemia
Aashna M Modi, Renee D Kiourkas, Jie Li, J Brady Scott
Respiratory Care Mar 2021, 66 (3) 384-390; DOI: 10.4187/respcare.07670

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Reliability of Smartphone Pulse Oximetry in Subjects at Risk for Hypoxemia
Aashna M Modi, Renee D Kiourkas, Jie Li, J Brady Scott
Respiratory Care Mar 2021, 66 (3) 384-390; DOI: 10.4187/respcare.07670
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Keywords

  • smartphone
  • heart rate
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  • hypoxemia
  • 6-min walk test
  • monitoring
  • pulse oximetry

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