title: Lingual-occlusal surface position predicts retroglossal obstruction in patients with obstructive sleep apnea hypopnea syndrome.
abstract: CONCLUSIONS
  Lingual-occlusal surface position was significantly related to retroglossal obstruction, and lingual-occlusal surface position may be an available reference in clinical practice for the preliminary assessment of retroglossal obstruction.
  
  
  OBJECTIVE
  To investigate the relationship between lingual-occlusal surface position and retroglossal obstruction in patients with obstructive sleep apnea hypopnea syndrome (OSAHS).
  
  
  METHODS
  A total of 140 patients with OSAHS diagnosed by polysomnography (PSG) were enrolled. Lingual-occlusal surface position was evaluated and classified into three types. Airway computed tomograpy (CT) was performed to measure the retroglossal cross-sectional area and inner diameter. The PSG was repeated after the nasopharyngeal tube insertion (NPT-PSG). The NPT-PSG results, CT-measured data and incidence of retroglossal obstruction were compared among the different lingual-occlusal surface positions groups.
  
  
  RESULTS
  The demographics of OSAHS patients with different lingual-occlusal surface positions was similar. As lingual-occlusal surface position type varied from type I to type III, retroglossal cross-sectional area and inner diameter decreased, retroglossal airway obstruction rate increased, apnea hypopnea index (AHI) measured by NPT-PSG increased, and lowest oxygen saturation (LaSO2) decreased.
authors.forename: Shuhua
authors.initials: S
authors.lastname: Li
authors.forename: Yanbin
authors.initials: Y
authors.lastname: Qin
authors.affiliation: a Department of Otolaryngology-Head and Neck Surgery, General Hospital of Shenyang Military Area Command , Shenyang, PR China.
authors.forename: Dahai
authors.initials: D
authors.lastname: Wu
mesh_terms: D000328:Adult; D000368:Aged; D000402:Airway Obstruction / Q000175:diagnosis* / Q000209:etiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D009305:Nasopharynx / Q000000981:diagnostic imaging* / Q000473:pathology; D017286:Polysomnography / Q000379:methods; D012189:Retrospective Studies; D020181:Sleep Apnea, Obstructive / Q000150:complications* / Q000175:diagnosis / Q000503:physiopathology; D014057:Tomography, X-Ray Computed; D014059:Tongue / Q000000981:diagnostic imaging* / Q000473:pathology; D055815:Young Adult
keywords: OSAHS; Obstructive sleep apnea hypopnea syndrome; lingua; occlusal surface; retroglossal