title: Detection of upper airway resistance syndrome using a nasal cannula/pressure transducer.
abstract: OBJECTIVE
  To determine the diagnostic utility of a nasal cannula/pressure transducer (NC), in comparison to thermistor (TH), during routine, clinical nocturnal polysomnography (NPSG).
  
  
  METHODS
  We analyzed the respiratory arousal index (RAI) using TH (RAI-TH) or NC (RAI-NC) in patients with suspected sleep-disordered breathing (SDB).
  
  
  METHODS
  Sleep disorders center of a university-affiliated teaching hospital.
  
  
  METHODS
  Fifty consecutive, nonselected patients referred for evaluation of suspected SDB.
  
  
  RESULTS
  Twenty patients were found to have obstructive sleep apnea/hypopnea syndrome (OSA), 25 had upper airway resistance syndrome (UARS), and 5 had primary snoring (PS). Mean RAI-NC was greater than the mean RAI-TH by 25%, 302%, and 500% in OSA, UARS, and PS, respectively. RAI-NC was >/= 14 (mean, 25.2) in UARS and < 14 (mean, 9) in PS. Mean RAI-TH was 8.4 in UARS and 1.8 in PS, with significant overlap between the two groups.
  
  
  CONCLUSIONS
  NC is more sensitive than TH in detecting respiratory events during NPSG and may represent a simple, objective means to identify UARS among patients with a range of SDB.
authors.affiliation: Department of Medicine and Sleep Disorders Center, Roger Williams Medical Center, Providence, RI, USA.
authors.forename: M D
authors.initials: MD
authors.lastname: Epstein
authors.forename: S A
authors.initials: SA
authors.lastname: Chicoine
authors.forename: R C
authors.initials: RC
authors.lastname: Hanumara
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000402:Airway Obstruction / Q000175:diagnosis* / Q000503:physiopathology; D000403:Airway Resistance / Q000502:physiology; D002404:Catheterization / Q000295:instrumentation*; D002940:Circadian Rhythm; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009666:Nose; D017286:Polysomnography / Q000379:methods*; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D012891:Sleep Apnea Syndromes / Q000175:diagnosis / Q000503:physiopathology; D012913:Snoring / Q000175:diagnosis / Q000503:physiopathology; D013577:Syndrome; D014160:Transducers, Pressure