title: Effects of naloxone on upper airway collapsibility in normal sleeping subjects.
abstract: BACKGROUND
  To evaluate the possible influence of endorphin release on upper airway collapsibility the effects of naloxone, an opiate receptor antagonist, were measured.
  
  
  METHODS
  The effects of naloxone on upper airway collapsibility were studied in five normal sleeping men in a pilot study. During a sleep fragmentation night the subjects received either naloxone or a volume matched saline placebo in a double blind crossover design. Critical pressure (Pcrit) was measured during a morning nap following sleep fragmentation.
  
  
  RESULTS
  The plasma levels of endorphins increased during sleep fragmentation nights. Pcrit was significantly greater after placebo than after naloxone infusion.
  
  
  CONCLUSIONS
  Naloxone may reduce upper airway collapsibility in normal sleeping subjects following sleep fragmentation.
authors.affiliation: Unité de Recherche, Centre de Pneumologie, Hôpital Laval, Université Laval, Sainte-Foy, Québec, Canada.
authors.forename: J C
authors.initials: JC
authors.lastname: Meurice
authors.forename: I
authors.initials: I
authors.lastname: Marc
authors.forename: F
authors.initials: F
authors.lastname: Sériès
mesh_terms: D000328:Adult; D004311:Double-Blind Method; D006801:Humans; D008297:Male; D009270:Naloxone / Q000494:pharmacology*; D009292:Narcotic Antagonists / Q000494:pharmacology*; D010609:Pharyngeal Muscles / Q000187:drug effects* / Q000502:physiology; D010865:Pilot Projects; D012890:Sleep / Q000502:physiology*; D001615:beta-Endorphin / Q000097:blood
chemical_list: D009292:Narcotic Antagonists; D009270:Naloxone; D001615:beta-Endorphin