Detection of bed-exit events using a new wireless bed monitoring assistance

ObjectivesTo assess, using complete polysomnography as the gold standard, the capability of Heasys®, an innovative wireless bed monitoring assistance to record body movements and presence and to infer bed-exit events and body position changes at night.DesignDescriptive study.SettingsSleep laboratory for patient's recording and home for healthy volunteers.ParticipantsTwelve patients referred for suspicion or treatment of sleep disordered breathing and 5 healthy subjects.MeasurementsComplete polysomnography was recorded during one night in patients and during two nights in healthy volunteers. Heasys® sheet was placed under the fitted bed sheet to allow concomitant recording. During the second night, healthy subjects were asked to get out of bed at least 2 times for a minimal duration of 3 min.ResultsHeasys® allowed the detection of all bed-exit events in patients and volunteers (sensitivity: 100%, and specificity: 85%). When bed-exit events were defined by the lack of the presence signal combined with absence of motion and a dip in temperature, sensitivity and specificity of Heasys® were 92 and 100%, respectively. In patients and volunteers, Heasys® detected body position changes recorded by polysomnography respectively, in 84 and 98% of the cases. Additional recorded motions were mainly related to leg movements or arousals.ConclusionIn this small feasibility study, Heasys® seemed to be an effective innovative device allowing bed-exit events detection in adult patients and healthy volunteers.