title: [Characteristics of respiratory disturbance during REM sleep in OSAHS].
abstract: OBJECTIVE
  To study the characteristics of respiratory disturbance during REM sleep in OSAHS through the signals surveyed by polysomnography (PSG).
  
  
  METHODS
  The result of sleeping monitoring of 180 cases with OSAHS by PSG was reviewed, the AHI and the RIT index was used to evaluate the severity in different sleep stage as in REM and N-REM stage to find out the characteristics of the respiratory disturbance.
  
  
  RESULTS
  The study showed that AHI index in mild group increased greatly in REM period (P < 0.05), but no significant changes between the moderate and severe groups. And the lowest oxygen saturation (LSaO2) was lower during REM stage than that during N-REM stage (P < 0.05).
  
  
  CONCLUSIONS
  (1) The time of REM in OSAHS patients often decreases according to their severity. (2) The respiratory disturbance during the stage REM is much severe than during the stage N-REM. The main manifestation is that the time of apnea-hypopnea is more longer and the AHI index does not significantly change. (3) The RIT index is more closely related to the severity of respiratory disturbance than AHI index.
authors.affiliation: Department of Otolaryngology, Lanzhou General Hospital of Lanzhou Military Command, Lanzhou, 730050, China.
authors.forename: Xuehai
authors.initials: X
authors.lastname: Xu
authors.forename: Xianliang
authors.initials: X
authors.lastname: Fan
authors.forename: Yali
authors.initials: Y
authors.lastname: Peng
mesh_terms: D000328:Adult; D000368:Aged; D006801:Humans; D008297:Male; D008875:Middle Aged; D017286:Polysomnography; D012120:Respiration Disorders / Q000175:diagnosis*; D020181:Sleep Apnea, Obstructive / Q000503:physiopathology*; D012895:Sleep, REM