神経難聴の原因とオージオグラム対称性

抄録

From four hundred and fifty nine cases of nerve deafness of various degree, cause of deafness and its relationship with the audiogram symmetry were studied.
Symmetrical audiograms was most frequently seen in presbyacusis, streptmycine deafness and so called occupational deafness, and the frequency decreased in order of deafness complicated with general infection, acute acoustic trauma, ménièr's syndrom, brain tumor and lastly, sudden deafness.
Since Langenbeck's Symmetric Gesetz 1936, congenital disposition has been emphasized as a most primary factor determining audiogram symmetry.
From above the order of symmetrical audiogram frequency, however, it has been noticed that when the cause was more intense or the onset was more acute, the changes in symmetrical audiogram became less.
When mechanism of the cause was added, the following conclusion was proposed. Primary factor determining audiogram symmetry was the balance of the effect of the cause on each ear, rather than existence of congenital disposition.