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The '''Apnea–Hypopnea Index''' or '''Apnoea–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_saturation_(medicine)|oxygen desaturation]] gives an overall sleep apnea severity score that evaluates both number sleep disruptions and degree of oxygen desaturation (low blood level). |
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| ⚫ | The AHI is calculated by dividing the number of apnea events by the number of hours of sleep. AHI values are categorized as <ref>{{cite web|title=Understanding the Results: Sleep Apnea|url=http://healthysleep.med.harvard.edu/sleep-apnea/diagnosing-osa/understanding-results|accessdate=5 September 2014}}</ref> <ref>{{cite journal |author=Ruehland WR, Rochford PD, O'Donoghue FJ, Pierce RJ, Singh P, Thornton AT |title=The new AASM criteria for scoring hypopneas: impact on the apnea hypopnea index |journal=Sleep |volume=32 |issue=2 |pages=150–7 |date=1 February 2009|pmid=19238801 |pmc=2635578}}</ref>: |
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*'''Normal''': '''0-4''' |
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*'''Mild''' Sleep Apnea: '''5-14''' |
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*'''Moderate''' Sleep Apnea: '''15-29''' |
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*'''Severe''' Sleep Apnea: '''30 or more''' |
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The AHI, as with the separate apnea index and hypopnea index, is calculated by dividing the number of events by the number of hours of sleep. (AHI values are typically categorized as 5–15/hr = mild; 15–30/hr = moderate; and > 30/h = severe.) |
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==See also== |
==See also== |
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* [[Obstructive sleep apnea]] |
* [[Obstructive sleep apnea]] |
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* [[Respiratory disturbance index]] |
* [[Respiratory disturbance index]] |
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* [[Oxygen saturation (medicine)]] |
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==References== |
==References== |
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{{reflist}} |
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{{DEFAULTSORT:Apnea-Hypopnea Index}} |
{{DEFAULTSORT:Apnea-Hypopnea Index}} |
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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]:
{{cite journal}}: CS1 maint: multiple names: authors list (link)
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