Abstract
Purpose
Home sleep testing devices are being widely used in diagnosis/screening for obstructive sleep apnea (OSA). We examined differences in OSA metrics obtained from two devices with divergent home monitoring strategies, the Apnea Risk Evaluation System (ARES™, multiple signals plus forehead reflectance oximetry) and the Nonin WristOx2™ (single channel finger transmission pulse oximeter), compared to differences from night-night variability of OSA.
Methods
One hundred fifty-two male/26 female subjects (BMI = 30.3 ± 5.6 kg/m2, age = 52.5 ± 8.9 years) were recruited without regard to OSA symptoms and simultaneously wore both ARES™ and Nonin WristOx2™ for two nights (n = 351 nights). Automated analysis of the WristOx2 yielded oxygen desaturation index (ODIOx2, ≥4% O2 dips/h), and automated analysis with manual editing of ARES™ yielded AHI4ARES (apneas + hypopneas with ≥4% O2 dips/h) and RDIARES (apneas + hypopneas with ≥4% O2 dips/h or arousal surrogates). Baseline awake oxygen saturation, percent time < 90% O2 saturation (%time < 90%O2Sat), and O2 signal loss were compared between the two methods.
Results
Correlation between AHI4ARES and ODIOx2 was high (ICC = 0.9, 95% CI = 0.87–0.92, p < 0.001, bias ± SD = 0.7 ± 6.1 events/h). Agreement values for OSA diagnosis (77–85%) between devices were similar to those seen from night-to-night variability of OSA using a single device. Awake baseline O2 saturation was significantly higher in the ARES™ (96.2 ± 1.6%) than WristOx2™ (92.2 ± 2.1%, p < 0.01). There was a significantly lower %time < 90%O2Sat reported by the ARES™ compared to WristOx2 (median (IQR) 0.5 (0.0, 2.6) vs. 2.1 (0.3, 9.7), p < 0.001), and the correlation was low (ICC = 0.2).
Conclusions
OSA severity metrics predominantly dependent on change in oxygen saturation and metrics used in diagnosis of OSA (AHI4 and ODI) correlated well across devices tested. However, differences in cumulative oxygen desaturation measures (i.e., %time < 90%O2Sat) between the devices suggest that caution is needed when interpreting this metric particularly in populations likely to have significant hypoxia.
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Acknowledgements
This study was supported by NIOSH/CDC U01OH010415 and NIH K24 grant HL109156.
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This study was funded by NIOSH/CDC U01OH010415 and NIH K24 grant HL109156.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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Informed consent was obtained from all individual participants included in the study.
Conflict of interest
TG, AT, SA, AP, and KB have no conflicts of interest to disclose.
DMR has received support for research from the industry in the past 24 months: grants from Fisher & Paykel Healthcare and speaking and consulting engagements for Fisher & Paykel Healthcare. DMR holds multiple US and foreign patents covering techniques and analysis algorithms for the diagnosis of OSA and techniques for administering CPAP. Several of these have been licensed to Biologics, Fisher & Paykel Healthcare, Advanced Brain Monitoring, and Sefam Medical.
JS has received support for speaker training from Merck Pharmaceuticals.
IA has received support for research from the industry in the past 24 months: grants from Fisher & Paykel Healthcare. IA holds multiple US and foreign patents covering techniques and analysis algorithms for the diagnosis of OSA and techniques for administering CPAP. Several of these have been licensed to Fisher & Paykel Healthcare and Advanced Brain Monitoring.
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Work performed at NYU Sleep Disorders Center and Rutgers Robert Wood Johnson Medical School
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Gumb, T., Twumasi, A., Alimokhtari, S. et al. Comparison of two home sleep testing devices with different strategies for diagnosis of OSA. Sleep Breath 22, 139–147 (2018). https://doi.org/10.1007/s11325-017-1547-9
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DOI: https://doi.org/10.1007/s11325-017-1547-9