New theory for the correlation of the pathology and the symptomatology of Meniere's disease; a research study of the vestibular endolymphatic labyrinth.
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In attempts to decrease gentamicin ototoxicity, the round windows of guinea pigs were covered with fat before gentamicin was given through the middle ear cavity. Although ototoxicity to the cochlea was reduced, the desired effect on the vestibular sense organs also was reduced, because of the oval window's resistance to drug penetration. In another series of guinea pigs, simple opening of the lateral semicircular canal and covering it with a pledget of Gelfoam soaked with gentamicin was an excellent method for producing a selective vestibular lesion. It is expected to reduce the function of all vestibular sense organs without impairing cochlear function.
Although the cause of idiopathic sudden sensorineural hearing loss remains uncertain, a viral origin has been suggested in many cases on the basis of anamnestic microbiologic and pathologic data. Twenty-two temporal bone specimens from 18 patients who during life suffered a sudden partial or complete sensorineural hearing loss were studied. On the basis of clinical data, these cases were assigned to one of three diagnostic categories, and the temporal bones were studied by light microscopy and serial section analysis. The implications of the histopathologic findings for the pathogenesis of idiopathic sudden sensorineural hearing loss are discussed.