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Definition of RDI

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Updated February 18, 2014

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Definition:

An index used to assess the severity of sleep apnea based on the total number of complete cessations (apnea) and partial obstructions (hypopnea) of breathing occurring per hour of sleep. These pauses in breathing must last for 10 seconds and are associated with a decrease in oxygenation of the blood. In general, the RDI can be used to classify the severity of disease (mild 5-15, moderate 15-30, and severe greater than 30).

Also Known As: Respiratory Disturbance Index, Apnea-Hypopnea Index or AHI
Examples:
The RDI revealed that I have severe sleep apnea.
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