The Apnea–Hypopnea Index or Apnoea–Hypopnoea Index (AHI) is an index used to indicate the severity of sleep apnea. It is represented by the number of apnea and hypopnea events per hour of sleep. The apneas (pauses in breathing) must last for at least 10 seconds and are associated with a decrease in blood oxygenation. Combining AHI and oxygen d...
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http://en.wikipedia.org/wiki/Apnea–hypopnea_index
(AHI) Type: Term Synonyms: respiratory disturbance index
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http://www.medilexicon.com/medicaldictionary.php?t=44133
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