AASM Hypopnea Scoring Clarification

The American Academy of Sleep Medicine (AASM) notified its members of the indefinite suspension of the requirement for accredited sleep centers to score hypopneas in adult patients according to the 3% oxygen desaturation criterion in the new AASM  scoring manual.

RELATED: Neurological Disorders Resource Center

The Academy still recommends scoring hypopneas in adults when there is a >3% oxygen desaturation from pre-event baseline with or without an arousal. However, it is still acceptable for accredited sleep centers to score hypopneas in adults when there is a >4% oxygen desaturation from pre-event baseline.

Hypopneas may be scored using the recommended rule 1A or the acceptable rule 1B:

Recommended

1A. Score a respiratory event as a hypopnea if ALL of the following criteria are met:

  • The peak signal excursions drop by ≥30% of pre-event baseline using nasal pressure (diagnostic study), PAP device flow (titration study), or an alternative hypopnea sensor (diagnostic study)
  • The duration of the ≥30% drop in signal excursion is ≥10 seconds 
  • There is a ≥3% oxygen desaturation from pre-event baseline and/or the event is associated with an arousal

Acceptable

1B. Score a respiratory event as a hypopnea if ALL of the following criteria are met:

  • The peak signal excursions drop by ≥30% of pre-event baseline using nasal pressure (diagnostic study), PAP device flow (titration study), or an alternative hypopnea sensor (diagnostic study)
  • The duration of the ≥30% drop in signal excursion is ≥10 seconds
  • There is a ≥4% oxygen desaturation from pre-event baseline

The criterion involving arousals is included in 1A and excluded from 1B. The criteria for scoring hypopneas in children remain unaffected.

For more information call (630) 737-9700 or visit AASMnet.org.

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