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 ?
The evidence, albeit of low quality, shows that any intensive weight-loss intervention helps improve OSA symptoms and scores on the apnea-hypopnea index.
Individuals with an apnea-hypopnea index of more than 20 were 4.
This increase reflects an improvement in the apnea-hypopnea index used to gauge the severity of OSA, and a decreased pressure effort of the upper airway, a factor that decreases the patient's needed effort to breathe.
The key thing is that it's the amount of low oxygen that the patients are getting, not essentially how many times it occurs, which is the apnea-hypopnea index.
Although weight loss reduced the average apnea-hypopnea index (AHI) by 25 percent from 24.
In 10 women referred for sleep-disordered breathing in the third trimester, the investigators found that significant improvements in the apnea-hypopnea index and minimum arterial oxyhemoglobin saturation occurred in all 10 postnatally.
The apnea-hypopnea index (AHI) is an important objective measure used in the diagnosis of sleep-disordered breathing.
The primary endpoint was change in the apnea-hypopnea index (AHI), a measure of the average number of breathing interruptions per hour during sleep.
Randomized controlled trials comparing lab-titrated continuous positive airway pressure (CPAP) to autoadjusting positive airway pressure (APAP) in unattended settings have shown similar compliance, apnea-hypopnea index (AHI), and daytime sleepiness improvements (Sleep 2010;33:267-71).
In the first study, conducted among 68 people with a high likelihood of sleep apnea, the apnea-hypopnea index on CPAP and Sleep Apnea Quality of Life Index scores at 3 months did not differ significantly between a sleep lab approach and an ambulatory approach (Ann.
For each chart of an obese child with OSA, a chart of a non-obese child with OSA was matched by age (within six months), gender, ethnicity and the obstructive apnea-hypopnea index (OAHI, within one episode per hour of total sleep time, or TST).