Apnoea | ≥90% reduction in airflow for ≥2 breaths |
Obstructive apnoea | Apnoea plus ongoing respiratory effort |
Central apnoea | Apnoea with absent respiratory effort plus ≥3% SpO2 desaturation or EEG arousal |
Hypopnoea | ≥30% reduction in airflow for ≥2 breaths plus ≥3% SpO2 desaturation or EEG arousal |
SpO2: peripheral oxygen saturation; EEG: electroencephalography.