The Apnea–Hypopnea IndexorApnoea–Hypopnoea Index (AHI) is an index used to indicate the severity of sleep apnea. It is represented by the number of apnea and hypopnea events per hour of sleep. The apneas (pauses in breathing) must last for at least 10 seconds and are associated with a decrease in blood oxygenation. Combining AHI and oxygen desaturation gives an overall sleep apnea severity score that evaluates both number sleep disruptions and degree of oxygen desaturation (low blood level).
The AHI is calculated by dividing the number of apnea events by the number of hours of sleep. AHI values are categorized as:[1][2]
Research shows that individuals suffering from obstructive sleep apnea are at a higher risk of other health comorbidities, including:
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