apnea-hypopnea index

(redirected from Apnea/hypopnea index)
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respiratory disturbance index (RDI),

a calculation of the average number of incidents of hypopnea and apnea per hour of sleep, as measured by polysomnography. A few sleep laboratories use this term to refer to any disturbance during sleep, including leg movements, snoring, and other phenomena, but such usage is generally discouraged by experts in the field.

ap·ne·a-hy·pop·ne·a in·dex

(AHI) (ap'nē-ă-hī-pop'nē-ă in'deks)
The number of apneic and hypopneic episodes combined per hour of sleep.
Synonym(s): apnoea-hypopnoea index.

apnea-hypopnea index

Abbreviation: AHI
The number of times in an hour when a sleeping person either stops breathing completely or has limited airflow. Each episode must last at least 10 sec. The AHI is one indicator of obstructive sleep apnea, although it is recognized as an imperfect diagnostic tool. An AHI of 30 or more events in an hour indicates severe sleep apnea; 15 to 29 events suggests moderate apnea; and 5 to 14 events indicates mild apnea.
See also: index

res·pi·ra·to·ry dis·turb·ance in·dex

(respir-ă-tōr-ē dis-tŭrbăns indeks)
A calculation of the average number of incidents of hypopnea and apnea per hour of sleep, as measured by polysomnography.
Synonym(s): apnea-hypopnea index.
References in periodicals archive ?
In contrast, the apnea/hypopnea index was unrelated to memory function in individuals who didn't carry the apo E4 allele.
The most striking study finding was that although there was no difference in cognitive function between the apo E [epsilon]4-positive and -negative groups overall, apo E [epsilon]4-positive individuals with sleep apnea as defined by a higher apnea/hypopnea index had lower memory scores as reflected by worse performance on the delayed recall and short-term recall components of the Rey test.
Overall success rates--as measured by the apnea/hypopnea index (group 1: 57.
Among patients with retropalatal narrowing or collapse (Fujita type I or IIa obstruction), the clinical response to UPPP (as defined by a reduction in the apnea/hypopnea index [AHI] of [greater than or equal to] 50% and a post-treatment AHI of < 20 in patients whose AHI was >20 preoperatively) has been reported to be 52.
The PSG generated data regarding sleep duration; the percentage of time spent in various stages of sleep; sleep arousals; the number of obstructive sleep apnea episodes and hyponeas per hour of sleep; the apnea/hypopnea index or obstructive index (OI); the number of oxygen desaturation episodes per hour of sleep; time spent during sleep with oxygen desaturation less than 90%; peak and average endtidal carbon dioxide; and time during sleep with end-tidal carbon dioxide greater then 45 mm Hg and greater than 50 mm Hg.
The number of arousals associated with apnea or hypopnea significantly explained IQ variance beyond what was explained by minimal oxygen saturation level or the apnea/hypopnea index.
The apnea/hypopnea index showed that children in the study had severe OSA, with a mean score of 29.