難聴鑑別診断のためのインピ-ダンスオ-ジオメトリ-の利用

概要

論文の詳細を見る
In unilateral deafness with an intact eardrum, usual pure-tone audiometry does not always reveal the actual threshold of bone conduction, because of cross hearing to the contralateral normal ear. Thus it becomes difficult in some cases to judge whether it is conductive or perceptive deafness. Through impedance audiometry, differential diagnosis of deafness could be simply and objectively made. When normal middle ear reflex was elicited from the affected ear by contralateral stimulation, the ear was judged to be perceptively deaf, because the reflex arch had no relation to the perceptive region of the tested ear. On the other hand, negative middle ear reflex indicates several types of deafnesses besides a conductive one. In the group with negative reflexes, diagnosis should be made based on the result of both middle ear reflex and tympanometry.
耳鼻咽喉科臨床学会の論文