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hypopnea |
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This machine defines an apneic event as a cessation of nasal airflow for 10 seconds or longer and a hypopneic event as a 50% reduction in nasal ventilation. OSAS was defined as the presence of sleep apnea symptoms and a respiratory disturbance index (RDI) of 10 or more on polysomnography (PSG), as evaluated by standard criteria [8]; RDI is calculated by averaging the number of apneic and hypopneic events per hour of sleep. By the early 1990s, Guilleminault et al described patients who experienced sleep fragmentation and daytime sleepiness, but who did not experience the obvious apneic or hypopneic events that caused the brief arousals that were observed. |
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