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Unattended Somnography Reliably Estimates Sleep Quality, Disturbed Breathing
A DGReview of :"Short-Term Variablility of Respiration and Sleep During Unattended Nonlaboratory Polysomnogaphy—The Sleep Heart Health Study"
Sleep
01/17/2003
By David Loshak
The US Sleep Heart Health Study might have provided a benchmark for similar studies through accurate estimation of quality of sleep and disturbed breathing at night.
The estimates of short-term variability of indices of disturbed respiration and sleep came from two unattended non-laboratory polysomnography measurements taken 31 to 112 nights apart, report members of the group, based at institutions in seven American cities.
The investigators recruited a subset of 99 participants in the Sleep Heart Health Study, randomly chosen on preliminary estimates of respiratory disturbance index and sleep efficiency. The respiratory disturbance index and sleep data from initial and repeated polysomnography were compared.
Acceptable repeat polysomnograms were obtained in 91 participants. There was no significant bias in respiratory disturbance index between study nights using several different respiratory disturbance index definitions.
Variability between studies estimated using intraclass correlations ranged from 0.77 to 0.81. For subjects with a 3.0% respiratory disturbance index below 15, variability increased as a function of increasing respiratory disturbance index but was otherwise constant.
Body mass index, sleep efficiency, sex and age did not directly predict index variability. Using respiratory disturbance index 4.0% cutpoints, events per hour of sleep showed that 79.1 to 87.9% of patients had the same sleep quality and disordered breathing on both nights when measurements were made.
There also was no significant bias in sleep staging, sleep efficiency or arousal index between studies. But variability was greater, with intraclass correlation coefficient values from 0.37 (percent of time in rapid eye movement sleep) to 0.76 (arousal index).
Sleep 2002;25(8):843-849.
"Short-Term Variablility of Respiration and Sleep During Unattended Nonlaboratory Polysomnogaphy—The Sleep Heart Health Study"
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