OTOSCLEROSIS has always been described as typical conduction deafness. The reason for this description is that until recent years Rinne's and Schwabach's tests, on which the diagnosis between conduction and perceptive deafness depends, were always performed with a low-pitched tuning fork, usually middle C (256 vibrations per second); and in otosclerosis bone conduction at this pitch remains normal for a very long time, even when it is grossly reduced at 512 cycles per second and higher frequencies.
For the past fifteen years routine tests have been performed in all cases with the air and bone conduction audiometer, and it has been found that except in relatively early cases bone conduction is seldom normal in the upper frequencies. As soon as the hearing falls below a certain level bone conduction in the higher frequencies begins to drop down, so that as one watches a case of otosclerosis develop one has the
WOODS RR. BONE CONDUCTION IN OTOSCLEROSIS. Arch Otolaryngol. 1950;51(4):485–499. doi:10.1001/archotol.1950.00700020508002
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