Influence of middle ear pressure on the function of inner ear.

概要

論文の詳細を見る
Some patients of otitis media with effusion have sensorineural hearing loss. In many causes being assumed, the influence of middle ear pressure was examined in the present study. Cochlear microphonics (CM) was recorded as an indicator of the inner ear function using guinea pigs. Positive or negative pressure was given to the tympanic cavity and external auditory canal at the same time. Pure tone was given to drive CM to the external auditory canal. CM amplitude went down under both positive and negative pressures. The decrease of CM amplitude was greater under negative pressure than under positive pressure.<BR>CM went down directly and became stable immediately under negative pressure. On the other hand, CM went down at first and then went up gradually under positive pressure. Although perilymphatic pressure of scala tympani measured by a servocotrolled micropipet system went down directly and became stable soon, it went up at first and then gradually went down under positive pressure. This phenomenon would have some relationship to the CM change.
日本耳科学会の論文