Evidence by polysomnography of ≥5 obstructive apnoeas/hypopnoeas per hour of sleep + ≥1 of: nocturnal breathing disturbances (snoring, snorting, gasping, breathing pauses); daytime sleepiness/fatigue/unrefreshing sleep not explained by another disorder; OR ≥15 obstructive apnoeas/hypopnoeas per hour of sleep regardless of accompanying symptoms
Evidence by polysomnography of ≥5 central apnoeas per hour of sleep
No additional structured criteria supplied
B. The disorder is not better explained by another current sleep disorder
A. Evidence by polysomnography of ≥5 obstructive apnoeas/hypopnoeas per hour of sleep + ≥1 of: nocturnal breathing disturbances (snoring, snorting, gasping, breathing pauses); daytime sleepiness/fatigue/unrefreshing sleep not explained by another disorder; OR ≥15 obstructive apnoeas/hypopnoeas per hour of sleep regardless of accompanying symptoms
A. Evidence by polysomnography of ≥5 central apnoeas per hour of sleep B. The disorder is not better explained by another current sleep disorder
Mild; Moderate; Severe
Idiopathic central sleep apnoea; Cheyne-Stokes breathing; Central sleep apnoea due to medication or substance; Treatment-emergent central sleep apnoea
Central sleep apnoea (different respiratory events; different mechanism); Primary insomnia (no respiratory events; no excessive daytime sleepiness); Hypersomnolence disorder (no respiratory events on PSG)
Obstructive sleep apnoea (obstructive vs central events on PSG - distinguishable by respiratory effort monitoring); Primary cardiac or neurological disorder causing Cheyne-Stokes; Medication-induced respiratory depression (vs primary CSA)