Internal Medicine
Online ISSN : 1349-7235
Print ISSN : 0918-2918
ISSN-L : 0918-2918
The Accuracy and Uncertainty of a Sheet-type Portable Monitor as a Screening Device to Identify Obstructive Sleep Apnea-hypopnea Syndrome
Masanori TsukaharaSeiichiro SakaoTakayuki JujoTakayuki SakuraiJiro TeradaReiko KuniiNobuhiro TanabeKoichiro Tatsumi
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2014 Volume 53 Issue 12 Pages 1307-1313


Objective Laboratory-based polysomnography (PSG) is the gold standard for diagnosing obstructive sleep apnea-hypopnea syndrome (OSAHS), but it is expensive and requires overnight hospitalization. Recently, a sheet-shaped breath detection monitor, the SD-101, has been developed, and several reports have so far demonstrated the screening accuracy of this device. The aim of this study was to assess the accuracy and the uncertainty of this device.
Methods A total of 101 suspected OSAHS patients underwent simultaneous examinations with PSG and the SD-101.
Results There was a statistically significant relationship between the respiratory disturbance index (RDI) by the SD-101 and the apnea-hypopnea index (AHI) by PSG. At an RDI cutoff of 14 episodes per hour, the sensitivity and specificity to detect an AHI ≥20 episodes per hour were 90.2% and 90.0%, respectively. To reduce the influence of sleep efficiency, the time in bed (TIB) obtained from PSG, instead of the total seep time (TST), was used to calculate the AHI from the PSG data. There was also a statistically significant relationship between the RDI and AHI for the TIB. Moreover, it was suggested that arousal index and TIB were likely associated with false-negative and/or false-positive results.
Conclusion Although the present study demonstrated a close relationship between the RDI and the AHI, use of the SD-101 to examine symptomatic OSAHS patients should be performed with a full understanding of its incapability to detect the sleep state, including arousal reaction and the existence of false respiratory events caused by body movements.

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© 2014 by The Japanese Society of Internal Medicine
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