title: Neurophysiological two-channel polysomnographic device in the diagnosis of sleep apnea.
abstract: OBJECTIVE
  Our objective was to evaluate a portable device (Somté, Compumedics, Australia), which incorporates 2 neurophysiological channels (electroencephalography and electrooculography) with cardiorespiratory monitoring for the diagnosis of obstructive sleep apnea (OSA).
  
  
  METHODS
  Full polysomnography (PSG) and Somté recordings were simultaneously performed in 68 patients with suspected OSA. Data were analyzed blindly by 2 scorers.
  
  
  RESULTS
  A good agreement between methods in sleep efficiency was observed (68.8% [18.4] with PSG vs 68% [19.1] with Somté [p: n.s.] for scorer 1, and 67.5% [19.1] vs 68.4% [18.5; p: n.s.] for scorer 2). The apnea-hypopnea index (AHI) obtained with Somté was lower than with PSG: 19 (17.8) vs 21.7 (19) (p < 0.001) for scorer 1, and 16.6 (16.7) vs 20 (18.8) (p < 0.001) for scorer 2. The sensitivity of Somté for a PSG-AHI > 5 was 91% for scorer 1 and 90% for scorer 2, while specificity was 77% and 90%, respectively. The areas under the receiver operating curve for different PSG-AHI cutoff points (≥ 5, ≥ 15, and ≥ 30) were 0.81, 0.90, and 0.86, respectively, for scorer 1, and 0.90, 0.88, and 0.83 for scorer 2.
  
  
  CONCLUSIONS
  These data suggest that Somté is an effective device to identify sleep and respiratory variables in patients with suspected OSA.
authors.affiliation: Unidad Multidisciplinar de Sueño, Hospital Universitario Vall d'Hebrón, Paseo Vall d'Hebrón 119-12908035, Barcelona. doctorferre@gmail.com
authors.forename: Alex
authors.initials: A
authors.lastname: Ferré
authors.forename: Gabriel
authors.initials: G
authors.lastname: Sampol
authors.forename: Maria José
authors.initials: MJ
authors.lastname: Jurado
authors.forename: Roser
authors.initials: R
authors.lastname: Cambrodi
authors.forename: Patricia
authors.initials: P
authors.lastname: Lloberes
authors.forename: Odile
authors.initials: O
authors.lastname: Romero
mesh_terms: D004569:Electroencephalography / Q000295:instrumentation / Q000379:methods; D004576:Electromyography / Q000295:instrumentation / Q000379:methods; D004585:Electrooculography / Q000295:instrumentation / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017286:Polysomnography / Q000295:instrumentation* / Q000379:methods; D012143:Respiratory Physiological Phenomena; D012680:Sensitivity and Specificity; D020181:Sleep Apnea, Obstructive / Q000175:diagnosis* / Q000503:physiopathology; D012894:Sleep Stages / Q000502:physiology