Noncontact respiratory monitoring during sleep: comparison of the touchless flow signal with respiratory inductance plethysmography flow (RIPflow) signal to assess respiratory events.
Paul S Addison, Lara Brewer, Krishna M Sundar, Robert Farney, Philip Smit, Andre Antunes, Dean Montgomery
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Abstract
Study objectives: A nonintrusive sleep monitoring technology based on the data from a commercially available depth sensing camera has been utilized for respiratory monitoring and shown to have good performance in assessing respiratory rates across a range of rates. This noncontact or touchless, technology allows continuous respiratory monitoring without attaching probes to the patient. We have noticed a strikingly similar morphology between the noncontact flow signal (NCMflow) and the flow signal derived using the chest and abdomen respiratory inductance plethysmography (RIPflow) bands. Here we report on a quantitative assessment of the morphological similarity between the two signals for a cohort of patients undergoing polysomnography.
Methods: We collected depth data from 25 sleep patients undergoing attended polysomnography. Correlation and mutual trending were assessed between the NCMflow and RIPflow signals in individuals undergoing diagnostic and split night polysomnography using Pearson correlation and concordance between the NCMflow and RIPflow signals.
Results: Strong correlation was observed across all patients between the NCMflow and RIPflow signals (range: 0.78-0.98, mean: 0.89 ± 0.06). Similarly, high values of concordance were achieved between the NCMflow and RIPflow signals (range: 0.85-1.0, mean: 0.96 ± 0.04).
Conclusions: The high values of correlation and concordances confirm that the NCMflow signal can potentially be used as a surrogate for RIPflow signal during sleep. Our findings strongly support the potential for noncontact continuous monitoring of respiratory disturbances during sleep.
Citation: Addison PS, Brewer L, Sundar KM, et al. Noncontact respiratory monitoring during sleep: comparison of the touchless flow signal with respiratory inductance plethysmography flow (RIPflow) signal to assess respiratory events. J Clin Sleep Med. 2025;21(4):713-721.
期刊介绍：
Journal of Clinical Sleep Medicine focuses on clinical sleep medicine. Its emphasis is publication of papers with direct applicability and/or relevance to the clinical practice of sleep medicine. This includes clinical trials, clinical reviews, clinical commentary and debate, medical economic/practice perspectives, case series and novel/interesting case reports. In addition, the journal will publish proceedings from conferences, workshops and symposia sponsored by the American Academy of Sleep Medicine or other organizations related to improving the practice of sleep medicine.
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