What are the AASM guidelines for scoring hypopneas in the evaluation of obstructive sleep apnea (OSA)?

Updated: Sep 15, 2020
  • Author: Himanshu Wickramasinghe, MD, MBBS; Chief Editor: Zab Mosenifar, MD, FACP, FCCP  more...
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Answer

The most recent guidelines from the American Academy of Sleep Medicine (AASM Weekly Update 9/26/2013) updated the definitions of the terms for scoring hypopneas (recommended and acceptable), as follows:

  • Recommended: Score a respiratory event as a hypopnea if all of the following criteria are met: (1) peak signal excursions drop by at least 30% of pre-event baseline using nasal pressure (diagnostic study), positive airway pressure device flow (titration study), or an alternative hypopnea sensor (diagnostic study); (2) duration of the at least 30% drop in signal excursion is 10 or more seconds; and (3) there is 3% or greater oxygen desaturation from pre-event baseline and/or the event is associated with an arousal.

  • Acceptable: Score a respiratory event as a hypopnea if all of the following criteria are met: (1) the peak signal excursions drop by 30% or greater of pre-event baseline using nasal pressure (diagnostic study), positive airway pressure device flow (titration study), or an alternative hypopnea sensor (diagnostic study); (2) the duration of the at least 30% drop in signal excursion is 10 or more seconds; and (3) there is 4% or greater oxygen desaturation from pre-event baseline.


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