Classification of sleep and wake using a novel minimal-contact single-channel device

Abstract

Background

Polysomnography (PSG) is the gold standard for sleep analysis and the diagnosis of sleep-disordered breathing (SDB). As PSG is time-consuming and labor-intensive, it is the last step in a stepwise diagnostic workup. An early preliminary diagnosis can be obtained by a novel single-channel minimal-contact device which is placed under the patient's mattress topper.

Objectives

This study assessed the diagnostic accuracy of the novel minimal-contact device VitaLog (SWG Sportwerk GmbH & Co. KG, Dortmund, Germany) for sleep–wake classification and measurement of heart rate (HR). The results were compared to PSG.

Materials and methods

VitaLog is a minimal-contact sensor that does not restrict sleep. The diagnostic accuracy of VitaLog was studied in 49 patients referred to our sleep research unit due to suspected SBD. Results obtained by VitaLog were compared to those of a simultaneous PSG to assess the diagnostic accuracy of VitaLog for sleep–wake classification and measurement of HR.

Results

Compared to PSG, the accuracy of HR determined by VitaLog was excellent (r = 0.99) with a bias of 0.15 beats per min (bpm). Regarding total sleep time (TST), we found a good correlation of r = 0.8 and a bias of 14 min. For sleep efficiency (SE) estimated by VitaLog, the correlation was moderate with r = 0.6 with a bias of 4.0%. Sleep latency (SL) and wake after sleep onset (WASO) were underestimated by 1 and 12 min, respectively.

Conclusions

VitaLog is a promising approach for the estimation of the sleep-related parameters TST, SE, SL, and WASO based on a minimal-contact sensor. In addition, it measures HR with excellent accuracy. However, algorithm modifications are desired to provide appropriate diagnostic accuracy in all sleep disorder cohorts.

from #ORL-AlexandrosSfakianakis via ola Kala on Inoreader http://ift.tt/2yXR3Sh