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

Int J Med Inform. 2011 Feb;80(2):127-32. doi: 10.1016/j.ijmedinf.2010.10.007. Epub 2010 Nov 4.

Abstract

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.

Publication types

  • Comparative Study

MeSH terms

  • Adult
  • Beds*
  • Case-Control Studies
  • Female
  • Humans
  • Male
  • Middle Aged
  • Monitoring, Physiologic*
  • Movement
  • Polysomnography / instrumentation*
  • Posture
  • Sleep Apnea Syndromes / diagnosis*