title: [Evaluation of a portable device based on peripheral arterial tone in the detection of obstructive sleep apnea].
abstract: OBJECTIVE
  To assess the accuracy of a wrist-worn device (Watch-PAT 200) in the diagnosis of obstructive sleep apnea syndrome (OSAHS).
  
  
  METHODS
  Forty-three adult subjects with suspected OSAHS simultaneously had a standard in-laboratory polysomnogram (PSG) and wore the Watch-PAT 200 during a full-night recording. PSG sleep and respiratory events were scored according to standard criteria. The PSG recordings were blindly manually analyzed, while Watch-PAT data were scored automatically based on the algorithm developed previously.
  
  
  RESULTS
  The mean age of the subjects was (42.2 ± 12.2) years (x(-) ± s), and mean body mass index was (28.0 ± 3.9) kg/m(2). Mean PSG apnea hypopnea index (AHI) was (34.9 ± 29.9) events per hour, and mean PAT-AHI was (36.0 ± 29.2) events per hour. There was a significant correlation between PAT AHI and AHI by PSG (r = 0.931, P < 0.01). A Bland-Altman plot of PAT AHI and PSG AHI was also used to assess the accuracy of Watch-PAT 200. At lower levels of AHI, PAT tended to overestimate disease severity, while at higher levels of AHI, Watch-PAT underestimated severity. To assess sensitivity and specificity of Watch-PAT, constructed receiver operator characteristic curves using a variety of AHI threshold values (5, 15 and 30 events per hour). For AHI ≥ 5 events per hour as threshold value, the Watch-PAT diagnosing rate was 93%, and sensitivity as well as specificity were 94.7% and 80.0%. The misdiagnosis rate and missed diagnosis rate were 20.0% and 5.3%. Optimal combinations of sensitivity and specificity for the AHI threshold values (15 and 30 events per hour) were 82.6% and 100.0%, 95.0% and 95.7% respectively.
  
  
  CONCLUSIONS
  The Watch-PAT 200 may offer an accurate, robust, and reliable ambulatory method for the detection of OSAHS, with minimal patient discomfort.
authors.affiliation: Department of Otorhinolaryngology Head and Neck Surgery, Beijing Chaoyang Hospital, Capital Medical University; Capital University of Medical Sciences School of Otorhinolaryngology, Beijing 100020, China.
authors.forename: Juan
authors.initials: J
authors.lastname: Zhang
authors.forename: Chun-yan
authors.initials: CY
authors.lastname: Wang
authors.forename: Ning-yu
authors.initials: NY
authors.lastname: Wang
authors.forename: Jun-qing
authors.initials: JQ
authors.lastname: Liu
authors.forename: Jing-yan
authors.initials: JY
authors.lastname: Du
authors.forename: Guo-xia
authors.initials: GX
authors.lastname: Zhou
authors.forename: Zhan-feng
authors.initials: ZF
authors.lastname: Yan
authors.forename: Xiao-hui
authors.initials: XH
authors.lastname: Wen
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Jin-feng
authors.initials: JF
authors.lastname: Liu
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018670:Monitoring, Ambulatory / Q000295:instrumentation*; D017286:Polysomnography / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D020181:Sleep Apnea, Obstructive / Q000175:diagnosis* / Q000503:physiopathology