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 ?
Correlation of respiratory disease with Obstructive sleep apnea to apnea-hypopnea index.
Individuals with an apnea-hypopnea index of more than 20 were 4.
Severity of OSA is based on magnitude of sleepiness, hypoxia, and the Apnea-Hypopnea Index (AHI).
A comparison of the parents' questionnaire scores with their children's apnea-hypopnea index obtained during a subsequent overnight polysomnographic study found that the screen had a 78% sensitivity for mild to severe OSA cases, with a 40% specificity.
In univariate analyses, the mean apnea-hypopnea index, ODI, and nighttime cortisol levels were significantly associated with global deficit scores and particularly with domains of learning, memory, and working memory, said the investigators.
4) The apnea-hypopnea index (AHI), also known as the respiratory disturbance index, is the sum of the number of apneic and hypopneic events per hour during sleep, and it indicates the severity of OSA.
2 percent of patients with mild OSA, which was defined as an apnea-hypopnea index (AHI) of five to less than 15 breathing pauses per hour of sleep.
A DME MAC letter to physicians stated that Type IV monitors must provide direct calculation of an apnea-hypopnea index (AHI) or respiratory disturbance index (RDI) as a result of measuring airflow of thoracoabdominal movement.
Ambulatory sleep studies were obtained for 90 of the snorers, 76 of whom had an apnea-hypopnea index of less than 0.
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.
7) For this study, obstructive sleep apnea was defined as an apneahypopnea index of [greater than or equal to] 20 events per hour, (8) or a rapid eye movement-specific apnea-hypopnea index of [greater than or equal to] 20 events per hour.
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.