title: Prospective evaluation of nocturnal oximetry for detection of sleep-related breathing disturbances in patients with chronic heart failure.
abstract: BACKGROUND
  Because patients with chronic heart failure (CHF) can benefit from specific treatment for coexisting obstructive and central sleep apnea (CSA), there is a need to develop accurate screening tools to identify or exclude these sleep-related breathing disturbances (SRBDs) in patients with CHF.
  
  
  OBJECTIVE
  To evaluate, prospectively, the diagnostic value of nocturnal home oximetry in identifying SRBD in CHF patients and in distinguishing central events from obstructive events.
  
  
  METHODS
  Blinded comparison of hospital and home oximetry, and polysomnographic nocturnal recordings
  
  
  METHODS
  Cardiac heart failure and sleep clinics in three tertiary referral centers.
  
  
  METHODS
  Fifty consecutive patients who were investigated for participation in the Canadian Continuous Positive Airway Pressure Trial for Congestive Heart Failure with Central Sleep Apnea and were recruited from three different centers.
  
  
  RESULTS
  Patients underwent two oximetry recordings, one at home and one during a polysomnographic study. The criterion for an SRBD was the presence of > 15 apneas and hypopneas per hour of sleep during polysomnography or an oxygen desaturation index of > 10 events per hour during oximetry. The pattern of desaturation/resaturation during oximetry was also examined to distinguish obstructive events from central events. Using a 2% fall in pulse oximetric saturation as the criterion for oxygen desaturation, home oximetry had a 85% sensitivity and a 93% specificity (p < 0.001) for detecting an SRBD. However, the desaturation/resaturation pattern did not accurately distinguish between obstructive events and central events (eg, 100% sensitivity, 17% specificity for identifying CSA). The interpretation of the oximetry recording was highly consistent between scorers (p < 0.001).
  
  
  CONCLUSIONS
  Overnight home oximetry is a sensitive and specific tool for identifying SRBDs in patients with CHF, but not for distinguishing between obstructive and central events in such patients.
authors.affiliation: Centre de Pneumologie Hôpital Laval, 2725, Chemin Sainte-Foy, Sainte-Foy, PQ, Canada G1V 4G5. frederic.series@med.ulaval.ca.
authors.forename: Frédéric
authors.initials: F
authors.lastname: Sériès
authors.forename: R John
authors.initials: RJ
authors.lastname: Kimoff
authors.forename: Debra
authors.initials: D
authors.lastname: Morrison
authors.forename: Marie Helene
authors.initials: MH
authors.lastname: Leblanc
authors.forename: Mark
authors.initials: M
authors.lastname: Smilovitch
authors.forename: Jonathan
authors.initials: J
authors.lastname: Howlett
authors.forename: Alexander G
authors.initials: AG
authors.lastname: Logan
authors.forename: John S
authors.initials: JS
authors.lastname: Floras
authors.forename: T Douglas
authors.initials: TD
authors.lastname: Bradley
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D006333:Heart Failure / Q000453:epidemiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010092:Oximetry / Q000295:instrumentation; D017286:Polysomnography; D011446:Prospective Studies; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D020182:Sleep Apnea, Central / Q000175:diagnosis* / Q000453:epidemiology; D020181:Sleep Apnea, Obstructive / Q000175:diagnosis* / Q000453:epidemiology