hˌaɪpoʊpnˈiːz kæn biː ˈiːðɚ sˈɛntɹəl ˈaɪ.ˈiː., æz pˈɑːɹt əvə wˈæksɪŋ ænd wˈeɪnɪŋ ɪn bɹˈiːðɪŋ ˈɛfɚt, ɔːɹ əbstɹˈʌktɪv ɪn ˈɔːɹɪdʒˌɪn.
Hypopneas can be either central i.e., as part of a waxing and waning in breathing effort, or obstructive in origin.