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December 1936


Author Affiliations

From the Otological Research Laboratory, Johns Hopkins University.

Arch Otolaryngol. 1936;24(6):723-730. doi:10.1001/archotol.1936.00640050738004

Usually the impairment of hearing by air conduction in patients with conduction deafness is accounted for readily by either lesions of the middle ear or otosclerotic lesions. When such patients have impairment of hearing by bone conduction the customary explanation is that there is also a lesion of the inner ear, the cochlear nerve or the auditory pathways of the central nervous system, i. e., that the patient has a so-called combined deafness. For some patients this is doubtless the correct explanation. However, the available evidence gives but poor support to the view that it is always the correct explanation.

The present investigation reports the incidence of impairment of hearing by bone conduction in a group of 516 patients who with either one or both ears heard better by bone than by air conduction. Furthermore, the present study seeks to determine by statistical analyses of the clinical histories