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.

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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:


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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.