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AASMMembershipSectionsNewsletter
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Issue #5
AmericanAcademy
of SleepMedicine
EEG arousal, but arousals are 3 seconds or greater and consistent
withAASM scoring rulewhenviewed at slower paper speed. AASM
scoring rules indicate 7obstructivehypopnea causing7micro-
arousals and four desaturations of 3%or greater in this 6minute
epoch.)
AASMhypopnea ruleA= “H”Discernibleflow reductionof 30%
ormorewith associated consequences of either adesaturationof
≥3%or an arousal
AASMhypopnea ruleB= “OH” Discernibleflow reductionof
30%ormorewith associated consequenceof adesaturationof 4%or
greater requiring4%desaturation for inclusionof events. Scoring in
this 6minute epoch identifies 2obstructivehypopnea (labeledOH)
causing adesaturationof 4%or greater.
Figure 2:
6minute sample of stageN1 andN2 supine duringCPAP titration
(Note stage is same as diagnostic sample but airflow reductions, micro arousal and limbmovements
are all resolved onCPAP.)
(Note the reflexive leg jerk and increased limbEMGactivity associatedwith hyperpnea andarousal at
the termination of each obstructive hypopnea.
Figure 1:
6minute sample of stageN1 andN2 supine from diagnosticPSG
