respiratory disturbance 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.

respiratory disturbance index

A measurement of the number of disordered breathing cycles during sleep. Sleep disordered breathing, which includes both apneas and hypopneas, results in daytime fatigue. It is also associated with an increased prevalence of cardiovascular disease.
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 ?
Sleep-disordered breathing was measured using overnight polysomnography data, and the severity was divided into four categories (none, mild, moderate, and severe) based on the respiratory disturbance index (RDI).
The following data were recorded: Respiratory disturbance index (RDI), defined as the sum of obstructive apnoeas and hypopnoeas per hour of sleep; central apnoeas, defined as the cessation of airflow and respiratory effort; and oxygen saturation nadir, the lowest percent oxygen saturation observed during sleep study.
They found that the mean respiratory disturbance index (RDI) of children sleeping in the supine position was significantly greater than the total RDI, defined as the RDI of children when all positions were included (14 vs.
We noted each patient's preoperative respiratory disturbance index (RDI), lowest desaturation level (based on a screening sleep study), severity of sleep apnea, and relevant medical conditions.
On average, the study participants were 44.8 years old, weighed 187 pounds, and had a respiratory disturbance index of 14.4, with 364 snoring events/hour.

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