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 ?
These phase 2 data indicate that the substantial weight loss achieved with Qnexa can significantly improve sleep apnea as measured by the apnea/hypopnea index.
The apnea/hypopnea index is the standard measure of OSA severity, indicating the number of apnea/hypopnea events per hour of sleep.
The most striking study finding was that although there was no difference in cognitive function between the apo E4-positive and -negative groups overall, apo E4-positive individuals with sleep apnea as defined by a higher apnea/hypopnea index had lower memory scores reflected by worse performance on the delayed recall and short-term recall components of the Rey test.
Nocturnal polysomnography found that her apnea/hypopnea index was 120 and her minimum arterial oxygen saturation level was 63%.
The primary endpoint was the change in Apnea/Hypopnea Index (AHI) between baseline and Week 28; secondary endpoints included weight loss, oxygen saturation and changes in blood pressure.
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.
The apnea/hypopnea index showed that children in the study had severe OSA, with a mean score of 29.
Overall success rates--as measured by the apnea/hypopnea index (group 1: 57.
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.