Complete paralysis under general anesthesia allowed separating anatomi
c factors from neural factors which influence pharyngeal patency. We c
ompared static mechanical properties of the passive pharynx in normals
and sleep apneics. The passive pharynx was narrower and more collapsi
ble in sleep apneics than normal controls indicating significance of a
natomic factors in the pathogenesis of obstructive sleep apnea.