Validity of sheet-type portable monitoring device for screening obstructive sleep apnea syndrome.
OBJECTIVE
The SD-101 is a non-restrictive sheet-like medical device that measures sleep-disordered breathing using pressure sensors that can detect the gravitational alterations in the body that accompany respiratory movement. One report has described that the screening specificity of the SD-101 for mild to moderate obstructive sleep apnea syndrome (OSAS) is relatively low. The present study examines whether the accuracy of the SD-101 for OSAS screening is improved by simultaneously measuring percutaneous oxygen saturation (SpO2).


METHODS
Sixty consecutive individuals with suspected OSAS consented to undergo overnight polysomnography (PSG) together with simultaneous measurements of SD-101 and SpO2 at our laboratory.


RESULTS
The apnea-hypopnea index (AHI) determined from PSG and the respiratory disturbance index determined from SD-101 measurements significantly correlated (SD-101 alone: r = 0.871, p < 0.0001; SD-101 with SpO2: r = 0.965, p < 0.0001). Bland-Altman plots showed a smaller dispersion for the SD-101 with SpO2 than for the SD-101 alone. The SD-101 with SpO2 detected an AHI of >15 on PSG with a sensitivity and specificity of 96.9 and 90.5 % compared with 87.5 and of 85.7 %, respectively, of the SD-101 alone.


CONCLUSIONS
Simultaneously measuring SpO2 improved the accuracy of the SD-101 for OSAS screening. Furthermore, this modality appears to offer high sensitivity and specificity for detecting even moderately severe OSAS.
Neuropsychiatric Research Institute, Japan Somnology Center, 1-24-10 Yoyogi, Shibuya-ku, Tokyo 151-0053, Japan. kobayashi@somnology.com
Mina
M
Kobayashi
Kazuyoshi
K
Namba
Satoru
S
Tsuiki
Masaki
M
Nakamura
Masamichi
M
Hayashi
Yuuki
Y
Mieno
Hiromi
H
Imizu
Shiho
S
Fujita
Atsushi
A
Yoshikawa
Hiroki
H
Sakakibara
Yuichi
Y
Inoue
D000328:Adult; D000368:Aged; D004867:Equipment Design; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008403:Mass Screening / Q000295:instrumentation*; D008875:Middle Aged; D010044:Outpatient Clinics, Hospital; D010100:Oxygen / Q000097:blood; D019095:Point-of-Care Systems; D017286:Polysomnography / Q000295:instrumentation*; D011237:Predictive Value of Tests; D020181:Sleep Apnea, Obstructive / Q000175:diagnosis*; D013223:Statistics as Topic
D010100:Oxygen