hˌaɪpoʊpnˈiː ɪz tˈɪpɪkli dᵻfˈaɪnd baɪ ɐ dˈiːkɹiːst ɐmˈaʊnt ʌv ˈɛɹ mˈuːvmənt ˌɪntʊ ðə lˈʌŋz ænd kæn kˈɔːz ˈɑːksɪdʒən lˈɛvəlz ɪnðə blˈʌd tə dɹˈɑːp.
Hypopnea is typically defined by a decreased amount of air movement into the lungs and can cause oxygen levels in the blood to drop.