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The American Academy of Sleep Medicine (AASM) Scoring Manual Update – Staging in Neonates and HST Rules for Adults

October 7, 2015

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The American Academy of Sleep Medicine (AASM) released Version 2.2 of the AASM Manual for the Scoring of Sleep and Associated Events on July 1, 2015.

This update is based on the recommendations of the AASM Scoring Manual Committee, the AASM Board of Directors has approved the addition of two new sections to the manual:

  • Sleep staging rules for infants
  • Home sleep apnea testing (HSAT) rules for adults.

According to the www.aasmnet.org, these new rules represent significant changes that also incorporate key terminology and definitions with which sleep clinicians and technologists must become familiar, including monitoring time and respiratory event index.

Key terminology for scoring sleep in infants:

  • Stage W (Wakefulness);
  • Stage N (NREM) – analogous to the previously used terminology of “quiet sleep”;
  • Stage R (REM) – analogous to the previously used terminology of “active sleep”;
  • Stage T (Transitional) – analogous to the previously used terminology of “indeterminate sleep.”

Key terminology for home sleep Apnea testing Scoring:

  • Monitoring time (MT): Total recording time minus periods of artifact and time the patient was awake as determined by actigraphy, body position sensor, respiratory pattern, or patient diary.
  • Respiratory event index (REI): Total number of respiratory events scored × 60 divided by monitoring time (MT).

All AASM accredited sleep facilities and HSAT programs are required to implement the new rules in Version 2.2 by October 1, 2015.

For more information on Sleepvirtual HST/PSG click here.

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