title: [Staging of sleep based on electroencephalograms and mental electromyograms recorded by a simplified polygraph, MemCalc-Malkin2].
abstract: OBJECTIVE
  To examine the feasibility of MemCalc-Malkin2, a simplified polygraph, for staging of sleep.
  
  
  METHODS
  Electroencephalograms and mentalelectromyograms were recorded in 33 patients with possible obstructive sleep apnea-hypopnea syndrome by a simplified polygraph, MemCalc-Malkin2, and their frequencies were analyzed according to the sleep stage that were determined by a simultaneous conventional polysomnography.
  
  
  RESULTS
  Sleep was divided into four stages, i.e., awake(SWake), rapid eye movement phase(SREM), shallow non-REM sleep {S(1+2)}, and deep non-REM sleep {S(3+4)}. The ratio of the amount of beta waves to that of delta waves was significantly different between the four sleep stages (p < 0.05), being highest in SWake and lowest in S(3+4). Mental electromyographic discharges were significantly more active in SWake and S(1+2) than in S(3+4) and SREM.
  
  
  CONCLUSIONS
  A MemCalc-Malkin2 appears promising for staging of sleep.
authors.affiliation: Department of Clinical Laboratory, Tohoku University Hospital, Sendai 980-8574, Japan. bigkyu-thk@umin.ac.jp
authors.forename: Noriko
authors.initials: N
authors.lastname: Ohisa
authors.forename: Hiromasa
authors.initials: H
authors.lastname: Ogawa
authors.forename: Nobuki
authors.initials: N
authors.lastname: Murayama
authors.forename: Katsumi
authors.initials: K
authors.lastname: Yoshida
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004569:Electroencephalography; D004576:Electromyography; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible / Q000502:physiology*; D008875:Middle Aged; D017286:Polysomnography / Q000379:methods*; D020181:Sleep Apnea, Obstructive / Q000175:diagnosis* / Q000503:physiopathology; D012894:Sleep Stages / Q000502:physiology*