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

OBJECTIVES: To 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.
DESIGN: Descriptive study. SETTINGS: Sleep laboratory for patient's recording and home for healthy volunteers. PARTICIPANTS: Twelve patients referred for suspicion or treatment of sleep disordered breathing and 5 healthy subjects. MEASUREMENTS: Complete 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.
RESULTS: Heasys(®) 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.
CONCLUSION: In this small feasibility study, Heasys(®) seemed to be an effective innovative device allowing bed-exit events detection in adult patients and healthy volunteers. Copyright Â