title: [Clinical value of TS90% in evaluation of hypoxemia in patients with obstructive sleep apnea/hypoventilation syndrome].
abstract: OBJECTIVE
  To explore the appropriate study how to properly evaluate the hypoxemia degree in patients with obstructive sleep apnea/hypoventilation syndrome (OSAHS).
  
  
  METHODS
  polysomnography was conducted on 108 OSAHS patients and 37 simple snorers to record the minimum oxygen saturation level (MiO(2)) and the total recorded time spent below 90% oxygen saturation (TS90%). The correlation between MiO(2) and the percent of the total recorded time spent below 90% oxygen saturation (TS90%) with the AHI were calculated.
  
  
  RESULTS
  The value of TS90% was significantly increased, and the value of MiO(2) was significantly decreased as the severity of OSAHS increased (all P < 0.001). The correlation coefficients of TS90% with AHI and with Epworth sleepiness scale (ESS) were both much higher than those of MiO(2).
  
  
  CONCLUSIONS
  TS90% can express the severity of hypoxemia of the OSAHS patients more correctly than MiO(2). TS90% combined with MiO(2) can comprehensively and objectively reflect the severity of hypoxia of the OSAHS patients.
authors.affiliation: Department of Otorhinolaryngology, Navy General Hospital, Beijing 100037, China.
authors.forename: Jin-rang
authors.initials: JR
authors.lastname: Li
authors.forename: Jian-jun
authors.initials: JJ
authors.lastname: Sun
authors.forename: Rong
authors.initials: R
authors.lastname: Zhang
authors.forename: Chun-feng
authors.initials: CF
authors.lastname: Li
authors.forename: Yu
authors.initials: Y
authors.lastname: Hu
authors.forename: Yu-mei
authors.initials: YM
authors.lastname: Sun
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D007040:Hypoventilation / Q000473:pathology / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D010092:Oximetry; D017286:Polysomnography / Q000379:methods*; D020181:Sleep Apnea, Obstructive / Q000175:diagnosis / Q000473:pathology / Q000503:physiopathology*; D012913:Snoring / Q000503:physiopathology; D013577:Syndrome