A novel device for the detection ofsleep disordered breathingand periodic limb movement
23 February 2017 (online)
Screening devices for sleep-disordered breathing are easy to use and sufficiently available. However, due to the unattended setting, screening has an error rate of 5 – 30%. Common reasons for this high screening failure rate include i.e. off-centered or unfixed sensors. It can be suggested that other screening technologies such as contactless monitoring devices minimize the error rate significantly.
Methods and Patients:
In 5 patients we analyzed the diagnostic accuracy of the device VitaLog (SWG Sportwerk GmbH, Dortmund, Germany) comparing it to simultanious polysomnography (PSG). This device measures body movements by using a motion sensitive sensor sheet. One device was placed on the matress in the thorax area and a second device was places on the matress area in the feet area. We hypothesized that from the recorded movement signal normal breathing patterns, SDB patterns and patterns of periodic limb movement (PLM) can be determined visually.
Visual analysis of the VitaLog signals compared to PSG data showed, that this device seems to be appropriate for the detection of normal breathing, SDB and PLM: Figure 1 shows the comparison of the Vitalog signals with the simultaneously generated PSG data. Here, VitaLog 1 is the signal of the lower placed sensor while Vitalog 2 is the signal of the sensor placed in the tune of the patients thorax.
The first results of the visual analysis of VitaLog signals compared to PSG data are encouraging as it seems that normal breathing, SDB and PLM patterns can be determined. We aim to validate this device against the gold standard polysomnography (PSG) in 120 patients. Subsequently, algorithms should be evolved in order to quantify the extent of SDB and PLM in terms of the apnea-hypopnea index and the periodic limb movement index.