title: Amsterdam positional OSA classification: the AASM 2012 recommended hypopnoea criteria increases the number of positional therapy candidates.
abstract: OBJECTIVE
  This study examined the effect of hypopnoea criteria on the prevalence of positional obstructive sleep apnoea (pOSA) identified under the Amsterdam Positional OSA Classification (APOC) system.
  
  
  METHODS
  Three hundred three consecutive patients undertaking polysomnography (PSG) for the suspicion of OSA were included in this retrospective investigation. PSGs were scored using both the 2007 American Academy of Sleep Medicine (AASM) recommended hypopnoea criteria (AASM2007Rec) and the 2012 AASM recommended hypopnoea criteria (AASM2012Rec). For each hypopnoea criteria, OSA patients were grouped according to the APOC categories (I, II or II) or else deemed non-APOC if they did not meet the APOC criteria. Outcome measures, such as Functional Outcomes of Sleep Questionnaire (FOSQ), MOS 36-item short-form health survey (SF-36) and psychomotor vigilance task (PVT), were also compared between the groups.
  
  
  RESULTS
  The AASM2012Recincreased the prevalence of OSA compared to AASM2007Rec. The AASM2012Rectrebled the number of APOC I patients compared to AASM2007Rec(297% increase) as well as increased the proportion of females in the APOC I group. AASM2012Recdid not change the number of APOC II and APOC III patients. In fact, the same patients were present in these categories irrespective of hypopnoea criteria. The proportion of non-APOC patients proportionally decreased with the AASM2012Reccriteria. There were no differences in outcome measures between the AASM2012Recand AASM2007Recgroups.
  
  
  CONCLUSIONS
  This study demonstrates that, compared to AASM2007Rec, AASM2012Recincreases the prevalence of who could be successfully treated with positional therapy. The proportion of females with pOSA also increases as a consequence of AASM2012Rec.
authors.affiliation: Sleep Disorders Centre, Department of Respiratory and Sleep Medicine, Princess Alexandra Hospital, Ipswich Rd, Woolloongabba, Qld, Australia. brett.duce@health.qld.gov.au.|Faculty of Science and Engineering, Queensland University of Technology, Brisbane, Qld, Australia. brett.duce@health.qld.gov.au.
authors.forename: Brett
authors.identifier: http://orcid.org/0000-0002-3134-5138
authors.initials: B
authors.lastname: Duce
authors.affiliation: Department of Clinical Neurophysiology, Seinäjoki Central Hospital, Seinäjoki, Finland.|Department of Applied Physics, University of Eastern Finland, Kuopio, Finland.
authors.forename: Antti
authors.initials: A
authors.lastname: Kulkas
authors.affiliation: Faculty of Science and Engineering, Queensland University of Technology, Brisbane, Qld, Australia.
authors.forename: Christian
authors.initials: C
authors.lastname: Langton
authors.affiliation: Faculty of Science and Engineering, Queensland University of Technology, Brisbane, Qld, Australia.|Department of Applied Physics, University of Eastern Finland, Kuopio, Finland.|Diagnostic Imaging Center, Kuopio University Hospital, Kuopio, Finland.
authors.forename: Juha
authors.initials: J
authors.lastname: Töyräs
authors.affiliation: Sleep Disorders Centre, Department of Respiratory and Sleep Medicine, Princess Alexandra Hospital, Ipswich Rd, Woolloongabba, Qld, Australia.
authors.forename: Craig
authors.initials: C
authors.lastname: Hukins
mesh_terms: D000328:Adult; D003430:Cross-Sectional Studies; D006970:Disorders of Excessive Somnolence / Q000145:classification / Q000175:diagnosis / Q000453:epidemiology / Q000628:therapy; D005260:Female; D006801:Humans; D007428:Intradermal Tests; D008297:Male; D008875:Middle Aged; D017286:Polysomnography; D011187:Posture; D012016:Reference Values; D012221:Rhinitis, Allergic, Perennial / Q000145:classification / Q000175:diagnosis / Q000453:epidemiology / Q000628:therapy; D012307:Risk Factors; D020181:Sleep Apnea, Obstructive / Q000145:classification* / Q000175:diagnosis / Q000453:epidemiology / Q000628:therapy*; D011795:Surveys and Questionnaires; D016896:Treatment Outcome
keywords: Amsterdam Positional OSA Classification; Hypopnoea definition; Obstructive sleep apnoea; Positional OSA; Prevalence