Evaluation of a portable recording device (Reggie) with actimeter and nasopharyngeal/esophagus catheter incorporated.
BACKGROUND
Portable recording devices without electroencephalogram recordings are frequently used for diagnosis of sleep-disordered breathing. However, an exact measure of sleep is important, since the diagnosis is based on the average number of events per hour of sleep, the apnea/hypopnea index (AHI). Actimetry is a simplified method for distinguishing sleep and wakefulness by measurements of activity.


OBJECTIVE
In this study, recording with a portable recording device (Reggie) including an incorporated actimeter and polysomnography were done simultaneously in order to test the effect of the actimeter.


METHODS
The study was performed at the sleep-related breathing disorder unit at the Ullevaal University Hospital, Oslo, Norway. Fifty-two consecutive patients referred to the hospital for diagnosis of sleep-disordered breathing were included.


RESULTS
There is agreement between the AHI obtained from the polysomnography and the AHI obtained from the Reggie system. The estimated mean difference is 3.5, with an SD of 5.3 (r = 0.98). The sleep time calculated with the Reggie system is greater than the sleep time obtained by polysomnography, the mean difference being 46 min, SD 56 min (r = 0.45).


CONCLUSIONS
Sleep time calculations with the Reggie system overestimate the sleep time. Still, the AHIs obtained by the two systems show good agreement. There is a slight tendency for the Reggie system to provide an AHI which is too low. This difference is small, and in most cases, it will be of no clinical significance.
The Sleep Clinic Omnia, Frederik Stangs gt. 11-13, NO-0264 Oslo, Norway. britt.overland@omniahelse.no
Britt
B
Øverland
Guttorm
G
Bruskeland
Harriet
H
Akre
Olav
O
Skatvedt
D006801:Humans; D018670:Monitoring, Ambulatory / Q000295:instrumentation* / Q000379:methods; D009068:Movement; D017286:Polysomnography / Q000295:instrumentation* / Q000379:methods; D012123:Pulmonary Ventilation; D012890:Sleep / Q000502:physiology; D020181:Sleep Apnea, Obstructive / Q000175:diagnosis*