The new AASM criteria for scoring hypopneas: impact on the apnea hypopnea index
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STUDY OBJECTIVES: To compare apnea-hypopnea indices (AHIs) derived using 3 standard hypopnea definitions published by the American Academy of Sleep Medicine (AASM); and to examine the impact of hypopnea definition differences on the measured prevalence of obstructive sleep apnea (OSA). DESIGN: Retrospective review of previously scored in-laboratory polysomnography (PSG). SETTING: Two tertiary-hospital clinical sleep laboratories. PATIENTS OR PARTICIPANTS: 328 consecutive patients investigated for OSA during a 3-month period. INTERVENTIONS: N/A. MEASUREMENTS AND RESULTS: AHIs were originally calculated using previous AASM hypopnea scoring criteria (AHI(Chicago)), requiring either >50% airflow reduction or a lesser airflow reduction with associated >3% oxygen desaturation or arousal. AHIs using the "recommended" (AHI(Rec)) and the "alternative" (AHI(Alt)) hypopnea definitions of the AASM Manual for Scoring of Sleep and Associated Events were then derived in separate passes of the previously scored data. In this process, hypopneas that did not satisfy the stricter hypopnea definition criteria were removed. For AHI(Rec), hypopneas were required to have > or =30% airflow reduction and > or =4% desaturation; and for AHI(Alt), hypopneas were required to have > or =50% airflow reduction and > or =3% desaturation or arousal. The median AHI(Rec) was approximately 30% of the median AHI(Chicago), whereas the median AHI(Alt), was approximately 60% of the AHI(Chicago), with large, AHI-dependent, patient-specific differences observed. Equivalent cut-points for AHI(Rec) and AHI(Alt), compared to AHI(Chicago) cut-points of 5, 15, and 30/h were established with receiver operator curves (ROC). These cut-points were also approximately 30% of AHI(Chicago) using AHI(Rec) and 60% of AHI(Chicago) using AHI(Alt). Failure to adjust cut-points for the new criteria would result in approximately 40% of patients previously classifled as positive for OSA using AHI(Chicago) being negative using AHI(Rec) and 25% being negative using AHI(Alt). CONCLUSIONS: This study demonstrates that using different published standard hypopnea definitions leads to marked differences in AHI. These results provide insight to clinicians and researchers in interpreting results obtained using different published standard hypopnea definitions, and they suggest that consideration should be given to revising the current scoring recommendations to include a single standardized hypopnea definition.
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Studies were scored by trained sleep technicians using American Academy of Sleep Medicine 2007 alternate criteria and used an AHI cutoff ≥ 15 events/h for a diagnosis of OSA.
“Studies were scored by trained sleep technicians using American Academy of Sleep Medicine 2007”
Depending on which hypopnea definition is used, the AHI may be considerably different in a given individual.
“Depending on which definition is used, the AHI may be considerably different in a given individual.25–27”
From Clinical Practice Guideline for Diagnostic Testing for Adult Obstructive Sleep Apnea: An American Academy of Sleep Medicine Clinical Practice Guideline (2017) · cites this paper as [25]
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- Authors
- Ruehland, W. R., Rochford, P. D., O’Donoghue, F. J., Pierce, R. J., Singh, P., & Thornton, A. T.
- Affiliations
- Institute for Breathing and Sleep (AU)
- Royal Adelaide Hospital (AU)
- Venue
- SLEEP
- Publisher
- Oxford University Press (OUP)
- Published
- 2009-02
- Volume
- 32
- Issue
- 2
- Pages
- 150-157
- ISSN
- 0161-8105 (ISSN-L)
- 1550-9109
- PMC
- PMC2635578
- OpenAlex
- W95419338
- Cited by
- 696
- References
- 32
- Citations by year
- 2026: 17 · 2025: 32 · 2024: 32 · 2023: 33 · 2022: 41 · 2021: 66 · 2020: 63 · 2019: 29 · 2018: 56 · 2017: 42 · 2016: 48 · 2015: 74 · 2014: 33 · 2013: 28 · 2012: 39
- FWCI
- 22.09
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- SLEEP (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Physiology › Obstructive Sleep Apnea Research
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Neuroscience of respiration and sleep
- Keywords
- apnea-hypopnea index, airflow reduction, oxygen desaturation, arousal, sleep apnea severity classification, diagnostic thresholds, polysomnography scoring, underdiagnosis of sleep apnea, receiver operating characteristic
- MeSH terms
- Adult, Cross-Sectional Studies, Cross-Cultural Comparison, Female, Humans, Male, Middle Aged, Oxygen, Reference Values, Retrospective Studies, United States, Victoria, Polysomnography, Practice Guidelines as Topic, Sleep Apnea, Obstructive
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