騒音性聴器障害と中耳伝音機構の態度との関連性について

　職業性難聴の成因については，気導説，並に骨導説，其の他種々あつて未だ明瞭ではないが，中耳疾患と職業性難聴との関係については，慢性化膿性中耳炎残貽症，就中，大なる鼓膜穿孔耳が騒音により如何なる影響を蒙るかについて，

　1）鼓膜健常耳に比し内耳障害を惹起すること軽度なりとするもの，

There are three theories holding the mid-dle ear disease to be the cause of inner ear disturbances in occupational hearing loss, in which such an effect to be slight, great and none at all; without a strong evidence in support of any one of them. However, by examining employees of a can factory where occupational noise is inevitable, Hori finds that, the hearing loss to be slight among those who showed negative reaction towards Onchis test and bone-conduction test with external canal plugged.