Elsevier

Sleep Medicine

Volume 14, Supplement 1, December 2013, Page e58
Sleep Medicine

Evaluation of sleep disordered breathing using non-contact remote bio-radiolocation method

https://doi.org/10.1016/j.sleep.2013.11.105Get rights and content

Introduction

One of the priority areas of sleep medicine is implementation of novel non-contact technical approaches for remote vital signs monitoring, including screening of sleep disordered breathing (SDB). Bio- radiolocation (BRL) is a modern remote sensing technology allowing non-contact respiratory monitoring, on the base of analysis of specific biometric modulation of radiolocation signal by reciprocal breathing movements of chest and abdominal wall. The objective of this study was to estimate diagnostic informativeness of BRL method in comparison with full-night polysomnography (PSG) for non- contact screening of SDB in adults.

Materials and methods

The sample included 7 subjects (4 males and 3 females, aged 43–62 years, with body mass index (BMI) of 21.6–57.7), depending on severity of obstructive sleep apnea syndrome (OSAS): 4 severe; 1 moderate; 1 mild; 1 normal. The PSG records were collected with Embla N7000 system in the sleep laboratory (Almazov Federal Heart, Blood and Endocrinology Centre). Simultaneously BioRascan system (RSLab, Bauman Moscow State Technical University) was applied. The internal clock of BRL and PSG systems were synchronized. Subsequently, PSG records were analyzed by a certified specialist and verification of corresponding BRL signals was performed manually by a trained operator.

Results

The analysis of PSG records revealed in total 2700 episodes of SDB: 1279 obstructive sleep apneas (OSA); 106 central sleep apneas (CSA); 495 mixed sleep apnea (MSA); 820 hypopneas (HYPA). The result of verification of BRL signal patterns for SDB in comparison with PSG was as follows: 1955 true positives; 745 false positives; 868 false negatives. Thus BioRascan system displayed a sensitivity of 69% and an accuracy of 72% in non- contact screening of SDB. The obtained results should be considered clinically significant in each case the estimate of apnea- hypopnea index (AHI) for BRL method got into the same range of OSAS severity scale as for PSG method.

Conclusion

Thus, the estimation of diagnostic informativeness of BRL method in comparison with full-night PSG allowed referring BioRascan system to Type 4 (continuous single or dual bioparameter recording) of portable monitoring devices for diagnostic assessment of patients with suspected OSAS, satisfying medical recommendations.

Acknowledgements

The study was supported by EU FP7- IRSES project AMISS (PIRSES-GA- 2010–269157) and grants of the Ministry of Education and Science of Russia (#14.B37.21.1929 and #7.305.2011) and RFBR (#12–07- 31014-a and #11–07-00213-a).

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