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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. It occurs when the muscles relax during sleep causing soft tissue in the back of the throat to collapse and block the upper airway. Pdf The Ignored Parameter In The Diagnosis Of Obstructive Sleep It is generally expressed as the number of events per hour. Obstructive sleep apnea severity scale . Obstructive sleep apnea osa is the most common type of sleep apnea and is characterized by repeated episodes of complete or partial obstructions of the upper airway during sleep despite the effort to breathe and is usually associated with a reduction in blood oxygen saturation in the obstructive sleep apnea hypopnea syndrome the episodes of decreased breathing are called hypopnea and. The apneas pauses in breathing must last for at least 10 seconds and be associated with a decrease in blood oxygenation...