apnea-hypopnea index

(redirected from apnoea-hypopnoea index)

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 ?
It also records number of apnoea-hypopnoea index, which helps in diagnosing obstructive sleep apnoea syndrome.
It has also been shown that OSAS patients have a 4-fold higher frequency of atrial fibrillation if apnoea-hypopnoea index (AHI) index is greater than 30 [17].
Using an apnoea-hypopnoea index (AHI) cut-off of [greater than or equal to] 15/h, the prevalence of SDB ranges from 7 to 14% in men and 2 to 7% in women, with increases over the last two decades [5, 6].
The patients were divided into four equal groups: Group 1 - snoring without apnoea (age 20- 40); Group 2 - snoring without apnoea (age 40-60); Group 3 - apnoea-hypopnoea index less than 5/hr; Group 4: apnoea- hypopnoea index greater than 30/hr.
Udwadia et al [13] also found that hypersomnolence was 21% in males and 26% in females based on Apnoea-Hypopnoea Index. Thurnheer et al [16] compared prevalence of OSA in both the genders and accounted body-size to be a reason for upper airway cross-sectional area, which was found to be similar in men and women.
Apnoea-hypopnoea index (AHI) was calculated based on the following formula: AHI = (total no.
This is referred to as the apnoea-hypopnoea index (AHI).
There is positive correlation between neck circumference, BMI and Epworth score with AHI (Apnoea-Hypopnoea Index).
Epidemiologic studies suggest a high prevalence of both obstructive and central sleep apnoeas, in the elderly (1-6,8-11), with a significant association between age and apnoea-hypopnoea index (AHI, number of apnoeas and hypopnoeas per hour of sleep).