Apnea-hypopnea index

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

The apnea-hypopnea index (AHI) is an index of severity that combines apneas and hypopneas. Combining them both gives an overall severity of sleep apnea including sleep disruptions and desaturations (a low level of oxygen in the blood). The apnea-hypopnea index, like the apnea index and hypopnea index, is calculated by dividing the number of apneas and hypopneas by the number of hours of sleep.

See also

• Respiratory Disturbance Index

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