They all underwent a formal sleep study and did not test positive for osa. The upper airway resistance syndrome uars was first named by guilleminault in 1993 while investigating cases of excessive daytime sleepiness with no identified cause in adults. Upper Airway Resistance Syndrome Uars With Images Upper Upper airway resistance syndrome in children. Upper airway resistance syndrome . Upper airway resistance syndrome is a sleep disorder characterized by the narrowing of the airway that can cause disruptions to sleep. Uars can be diagnosed by polysomnograms capable of detecting respiratory effort related arousals. Upper airway resistance syndrome uars is a condition that was first identified and described at stanford university. They described a group of young women and men who complained of fatigue and daytime sleepiness. The primary symptoms include chronic insomnia anxiety fatigue or sleepiness unrefreshing sleep and difficulty concentrating. 1 stanford university sleep...