0507 A wireless patch-based polysomnography system for conducting in-lab sleep studies

Abstract

Abstract Introduction Current attended in-lab polysomnographic sleep studies are time-consuming and costly, primarily due to the time required to “hook-up” a patient to multiple electrodes and sensors and meet the quality assurance and safety requirements of an in-lab study. We developed a wireless PSG system (Onera STS - Onera Health, NL) consisting of four disposable patches and reusable pods to record full polysomnography that may reduce hook-up time while preserving standards of an attended polysomnography in the lab. Methods We used the Onera STS system for monitoring EEG, EOG, EMG, forehead reflectance SaO2, ECG, bioimpedance derived respiratory airflow and effort, airflow via nasal cannula, snoring sounds, body position, actigraphy, and leg movements, and accessory online monitoring of finger SaO2, ECG, nasal cannula airflow and video via RemLogic 4.0 or REM logic MPR system for Q/A and safety monitoring. Seventeen subjects (8 male, 9 female, age 18-to-75 yrs, BMI 29.9±6.0 kg/m2) were monitored for the evaluation of sleep apnea. We measured hook-up times and observed oxygen saturation and cardiac rhythm throughout the night. Results Mean hook-up time for the Onera STS was 5:22±1:17 minutes and for the additional on-line sensors (Finger SaO2, ECG and nasal cannula) was 3:15±1:10 minutes, resulting in an average hook-up time of less than 10 minutes. Onera PSG data revealed a mean oxygen desaturation event rate of >3% (ODI3) of 8.8 (SD 18.6) and a mean fall of oxygen saturation (ΔSaO2/event) of 4.4 (SD 1.2). The accessory online SaO2, ECG and video monitoring showed that no subjects demonstrated sustained nocturnal hypoxia, severe cardiac arrhythmia or parasomnia events that would have required interventions. Conclusion The Onera STS system substantially lowers the burden to conduct attended polysomnographic sleep studies. In combination with standard monitoring of SaO2, ECG and video, it meets the safety requirements for attended sleep studies while reducing the overall operational and capital equipment costs. The ease of application together with the reduced hook-up time makes it now possible to implement polysomnographic sleep studies in the hospital setting, particularly in addition to conventional bedside monitoring units such as ICU-, step-down unit- or hospital beds. Support (if any)