| Apnea–hypopnea index |
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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 be associated with a decrease in blood oxygenation. Combining AHI and oxygen desaturation gives an overall sleep apnea severity score that evaluates both the number of sleep disruptions and the degree of oxygen desaturation (low oxygen level in the blood).
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]
- Normal: AHI<5
- Mild sleep apnea: 5≤AHI<15
- Moderate sleep apnea: 15≤AHI<30
- Severe sleep apnea: AHI≥30
For children, because of their different physiology, an AHI in excess of 1 is considered abnormal. Pediatric patients presenting with AHI of 2 or greater will often be referred for treatment.[3]
See also
- Obstructive sleep apnea
- Respiratory disturbance index
- Oxygen saturation (medicine)
References
- ^ "Understanding the Results: Sleep Apnea". med.harvard.edu. Harvard Medical School, Harvard University. Retrieved 5 September 2014.
- ^ Ruehland WR, Rochford PD, O'Donoghue FJ, Pierce RJ, Singh P, Thornton AT (1 February 2009). "The new AASM criteria for scoring hypopneas: impact on the apnea hypopnea index". Sleep. 32 (2): 150–7. doi:10.1093/sleep/32.2.150. PMC 2635578. PMID 19238801.
- ^ "Obstructive Sleep Apnea in Children". aafp.org. American Academy of Family Physicians. Retrieved 11 October 2016.