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.
Farlex Partner Medical Dictionary © Farlex 2012

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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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
Medical Dictionary, © 2009 Farlex and Partners

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.
Medical Dictionary for the Dental Professions © Farlex 2012
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.
Women whose menopausal status did not change had a mean apnea/hypopnea index of 1.1; those who changed menopausal status had an index of 3.6, which indicated much higher proportion of episodes of apnea and hypopnea.
Overall success rates--as measured by the apnea/hypopnea index (group 1: 57.1% success; group 2: 50.0%) and by the apnea index (group 1: 71.4% success; group 2: 70.0%)--were statistically comparable, given the small size of the sample (figures are based on l0 patients in group 2).
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. This finding raises the question of whether it is the poor gas exchange associated with sleep-disordered breathing or the fragmented sleep patterns as indicated by arousals, which best explain decreased IQ scores, Dr.
The apnea/hypopnea index showed that children in the study had severe OSA, with a mean score of 29.1 compared with 0.3 for controls.