UARS stands for which condition?

• A. Sinoatrial
• B. Sleep Onset REM
• C. Upper Airway Resistance Syndrome
• D. Time Constant

Answer: (C)

UARS stands for Upper Airway Resistance Syndrome, a sleep-related breathing condition where the upper airway offers increased resistance during sleep. This causes the person to generate more inspiratory effort and leads to arousals and fragmented sleep, resulting in daytime sleepiness, even though there aren’t the typical prolonged pauses or significant oxygen desaturation seen with obstructive sleep apnea. On sleep study, you often see respiratory effort-related arousals with heightened inspiratory effort; oxygen levels may be preserved or show only mild drops. The other terms don’t describe a sleep breathing disorder: the heart-related term is about cardiac rhythm, while Sleep Onset REM isn’t a standard diagnosis, and Time Constant is a physiology term not used for a sleep disorder.