Sleep apnea syndrome

Hypopnea

Can be defined based on 1 of 2 criteria:

A reduction in airflow of at least 30% for more than 10 seconds associated with at least 4% oxygen desaturation (Acceptable AASM criteria) or a reduction in airflow of at least 30% for more than 10 seconds associated with at least 3% oxygen desaturation or an arousal from sleep on EEG (Recommended AASM criteria).

Apnea

Scoring apnea requires both of the following criteria to be met:

A. Drop in the peak signal excursion by ≥90% of pre-event baseline flow

B. Duration of the drop in flow is ≥10 seconds

Obstructive apnea

Occurs if there is increased effort throughout the entire apnea

Central apnea

Occurs if there is no effort throughout the entire apnea

Mixed apnea

Occurs if there is no effort in the first part and there is an effort in the second part of the apnea.