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 ?
Out of 38 males, 20(40%) had apnea-hypopnea index less than 5, 8(16%) had apnea-hypopnea index 5-14, 7 (14%) had AHI 15-29 and 3 (6%) had AHI equal or More than 30.Out of 10 female patients 7(14%) had apnea-hypopnea index less than 5, 2(4%) had AHI between 5-14, 1(2%) patients had AHI 15-29.
Novel parameters indicate significant differences in severity of obstructive sleep apnea with patients having similar apnea-hypopnea index. Med Biol Eng Comput 2013; 51: 697-708.
To assess the apnea-hypopnea index (AHI), the researchers defined disordered-breathing events based on both the >3% and >4% thresholds for oxygen desaturation.
All patients had an Apnea-Hypopnea Index score greater than 15, indicating moderate to severe sleep apnea, and all were on opioid medication.
Cortex earlier conducted a 21-day, randomised, double-blind, placebo-controlled, dose escalation Phase two clinical study in 22 patients with obstructive sleep apnea, in which dronabinol produced a statistically significant reduction in the Apnea-Hypopnea Index , the primary therapeutic end-point, and was observed to be safe and well tolerated.
The findings show the HGNS System reduced the severity of OSA by an average of over 50%, as measured by the apnea-hypopnea index (AHI).
Ambulatory sleep studies were obtained for 90 of the snorers, 76 of whom had an apnea-hypopnea index of less than 0.8.
Patients were defined as having moderate to severe OSA if they had more than 20 apneas and hypopneas per hour of sleep (their apnea-hypopnea index was greater than 20).
Outcomes considered are signs and symptoms of OSA; patient risk factors, including comorbidities; accuracy of diagnostic tests; effects of treatment on apnea-hypopnea index and other measures; patient compliance and satisfaction with treatment; and complications of treatment.
The study found that supplemental oxygen substantially reduced intermittent hypoxia, but had minimal effect on two markers of arousal: the apnea-hypopnea index, a measure of sleep apnea severity that takes into account episodes of paused and shallow breathing.
After adjustment for age, sex, race/ethnicity, marital status, income level, educational level, body mass index, apnea-hypopnea index, and the Functional Comorbidity Index, a moderate treatment association remained.