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.
Synonym(s): apnea-hypopnea index
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.
Synonym(s): apnoea-hypopnoea index.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
apnea-hypopnea index
Abbreviation: AHIThe 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.
Synonym(s): apnea-hypopnea index.
Medical Dictionary for the Dental Professions © Farlex 2012