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

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.

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.

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References in periodicals archive ?

Correlation of respiratory disease with Obstructive sleep apnea to apnea-hypopnea index.

Study of polysomnography in cure post-tuberculosis patients

Individuals with an apnea-hypopnea index of more than 20 were 4.

Moderate to severe OSA is risk factor for stroke

Severity of OSA is based on magnitude of sleepiness, hypoxia, and the Apnea-Hypopnea Index (AHI).

How should we diagnose and treat obstructive sleep apnea?

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.

Shorter screen developed for pediatric OSA

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.

Cortisol levels predict neurocognitive impairment in OSA

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.

Hyoid suspension surgery with UPPP for the treatment of hypopharyngeal airway obstruction in obstructive sleep apnea

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.

Severe sleep apnea reduces nightmare recall frequency

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.

Home sleep testing for Medicare patients

Ambulatory sleep studies were obtained for 90 of the snorers, 76 of whom had an apnea-hypopnea index of less than 0.

Nonapneic snoring affects behaviors, academics

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.

Severe apnea can present fetal threat

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.

Bilateral leg edema, pulmonary hypertension, and obstructive sleep apnea: a cross-sectional study. (Brief Report)

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.

Home testing for sleep apnea 'here to stay'

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