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Dr Clyde Keevy – Upper Airway Resistance Syndrome

UARS is a form of sleep disordered breathing (SDB) characterized by IFL during sleep with excessive sleepiness/ fatigue, but without the recurrent apnea/hypopnea or oxyhemoglobin desaturation that characterizes OSA.

UARS is traditionally diagnosed when Apnea/Hypopnea index (AHI) is fewer than 5 events per hour and the simultaneous calculated Respiratory Distress index (RDI) more than 5 events per hour, the difference being the RERA included in the RDI.

The significance attributed to these arousals gave rise to a new term, respiratory effort related arousals (RERA)