Severe obstructive sleep apnea is defined as an apnea-hypopnea index of greater than?: (A) 10 events/ hour, (B) 15 events/ hour, (C) 20 events/ hour, (D) 30 events/ hour
Answer is D. Obstructive sleep apnea/ hypopnea syndrome quantification and severity scale is graded according to number of apnea/ hypopnea index events per hour Mild OSAHS 5 -14 events / hour Moderate OSAHS 15-29 events / hour Severe OSAHS >30 events / hour