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{{Short description|Index used to indicate the severity of sleep apnea}} |
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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. |
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{{Infobox diagnostic |
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}} |
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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. Apnea is the complete absence of airflow through your nose and mouth. Hypoapnea is a partial collapse of your airway, limiting breathing. Apneas (pauses in breathing) must last for at least 10 seconds and be associated with a decrease in blood oxygenation to be considered. Combining AHI and [[Oxygen saturation (medicine)|oxygen desaturation]] gives an overall sleep apnea severity score that evaluates both the numberof sleep breathing disruptions and the degree of oxygen desaturation (low oxygen level in the blood) during said disruptions. |
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| ⚫ | The AHI is calculated by dividing the number of apnea events by the number of hours of sleep. The AHI values for adults are categorized as:<ref>{{cite web| title= Understanding the Results: Sleep Apnea|url=http://healthysleep.med.harvard.edu/sleep-apnea/diagnosing-osa/understanding-results| website= med.harvard.edu| publisher= [[Harvard Medical School]], Harvard University| accessdate=5 September 2014}}</ref><ref>{{cite journal |vauthors=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 |doi=10.1093/sleep/32.2.150}}</ref> |
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*Normal: AHI<5 |
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The AHI is calculated by dividing the number of apnea events by the number of hours of sleep. AHI values |
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*Mild sleep apnea: 5≤AHI<15 |
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*Moderate sleep apnea: 15≤AHI<30 |
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*Severe sleep apnea: AHI≥30 |
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For children, because of their different physiology, an AHI in excess of 1 is considered abnormal. Underage pediatric patients presenting with AHI of 2 or greater will often be referred for treatment.<ref>{{cite journal|title= Obstructive Sleep Apnea in Children |url= http://www.aafp.org/afp/2004/0301/p1147.html| journal= American Family Physician|date= March 2004|volume= 69|issue= 5|pages= 1147–1155| publisher= [[American Academy of Family Physicians]]|accessdate=11 October 2016|last1= Chan|first1= James|last2= Edman|first2= Jennifer C.|last3= Koltai|first3= Peter J.|pmid= 15023015}}</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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==Risks associated with high AHI== |
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Research shows that individuals suffering from obstructive [[sleep apnea]] are at higher risk of other health comorbidities, including: |
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*Acute [[myocardial infarction]]/heart attack (OSA presents in 70% of heart attack patients with AHI ≥5 and 52% of heart attack patients with AHI ≥10)<ref>{{cite journal |author= Kuniyoshi et al.|title=Day–Night Variation of Acute Myocardial Infarction in Obstructive Sleep Apnea |journal=Journal of the American College of Cardiology |volume=52 |issue=5 |pages=343-346 |date=July 2008|doi=10.1016/j.jacc.2008.04.027|url=http://content.onlinejacc.org/article.aspx?articleid=1139082&resultClick=3}}</ref> |
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*[[Stroke]] (in patients with AHI ≥30 macroangiopathic etiology of stroke were significantly higher than in patients with AHI <10)<ref>{{cite journal |author= Claudio L. Bassetti, Milena Milanova, Matthias Gugger|title=Sleep-Disordered Breathing and Acute Ischemic Stroke: Diagnosis, Risk Factors, Treatment, Evolution, and Long-Term Clinical Outcome |journal=Stroke|volume=37 |pages=967-972 |date=6 March 2006|doi=10.1161/01.STR.0000208215.49243.c3}}</ref> |
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==See also== |
==See also== |
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{{Portal|Medicine}} |
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* [[Obstructive sleep apnea]] |
* [[Obstructive sleep apnea]] |
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* [[Respiratory disturbance index]] |
* [[Respiratory disturbance index]] |
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==References== |
==References== |
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{{reflist}} |
{{reflist}} |
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{{DEFAULTSORT:Apnea-Hypopnea Index}} |
{{DEFAULTSORT:Apnea-Hypopnea Index}} |
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| 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. Apnea is the complete absence of airflow through your nose and mouth. Hypoapnea is a partial collapse of your airway, limiting breathing. Apneas (pauses in breathing) must last for at least 10 seconds and be associated with a decrease in blood oxygenation to be considered. Combining AHI and oxygen desaturation gives an overall sleep apnea severity score that evaluates both the number of sleep breathing disruptions and the degree of oxygen desaturation (low oxygen level in the blood) during said disruptions.
The AHI is calculated by dividing the number of apnea events by the number of hours of sleep. The AHI values for adults are categorized as:[1][2]
For children, because of their different physiology, an AHI in excess of 1 is considered abnormal. Underage pediatric patients presenting with AHI of 2 or greater will often be referred for treatment.[3]
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