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The '''apnea-hypopnea index (AHI)''' is the number of apneas (pauses in breathing) plus the number of hypopneas (periods of shallow breathing) that occur each hour. This index is used as a measure of the severity of the condition known as sleep apnea. To count in the index the apneas and hypopneas must have a duration of at least 10 seconds and are typically associated with a decrease in blood oxygenation. The AHI is an overall sleep apnea severity score that evaluates both the number of sleep disruptions and the --[[User:Sleepster|Sleepster]] 14:41, 28 January 2012 (UTC)degree of oxygen desaturation (low blood oxygen level).