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Apnea Hypopnea Index (AHI) is the number of times per hour of sleep that your upper airway partially or completely collapses, leading to a brief arousal (or awakening) from sleep or a drop in blood oxygen levels. The partial collapse of the airway is called a hypopnea. The complete absence of airflow through the nose and mouth, despite an effort to breathe as measured at the chest and abdomen, is called an apnea event.
The AHI is used to classify the severity of sleepĀ apnea. This same classification is used to assess how well the CPAP machine is working.
The following guidelines are used in adults: