A Comparison of Apnea-Hypopnea Indices Derived from Different Definitions of Hypopnea

摘要

We examined the effects of arousal- and desaturation-based scoring criteria on the apnea-hypopnea index (AHI) and on the measured prevalence of obstructive sleep apnea (OSA). Ninety-four randomly selected patients underwent overnight polysomnography. Studies were scored according to three different criteria for hypopnea, as defined by a >=10 s discernible reduction in thoracoabdominal movement associated with: (1)>=40/100 decrease in oxygen saturation (Sao_2) Type A); (2) either a >=40/100 decrease in Sao_2 or an arousal (Type B); or (3) electroencephalographically based aorusal alone (Type C).