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Separate forms of pathology in the cochlea of congenitally deaf white cats. Hear Res 2003 Jul;181(1-2):73-84

Date

07/12/2003

Pubmed ID

12855365

DOI

10.1016/s0378-5955(03)00171-0

Abstract

Congenital deafness due to cochlear pathology can have an immediate or progressive onset. The timing of this onset could have a significant impact on the development of structures in the central auditory system, depending on the animal's hearing status during its critical period. In order to determine whether cats in our deaf white cat colony suffered from progressive hearing loss, they were tested repeatedly in 30-day intervals using standard auditory evoked brainstem response (ABR) methodology. ABR thresholds did not change over time, indicating that deafness in our colony was not progressive. Moreover, different forms of cochlear pathology were associated with deafness. One form (67% of the deaf ears) had a collapsed Reissner's membrane that obliterated the scala media, resembling what is called the Scheibe deformity in humans. A second form (18%) exhibited excessive epithelial growth within the bony labyrinth. A third form (15%) combined excessive epithelial growth in the apex and a collapsed Reissner's membrane in the base. Cochleae having an abnormally thin tectorial membrane and an outward bulging Reissner's membrane were associated with elevated thresholds (poor hearing).

Author List

Ryugo DK, Cahill HB, Rose LS, Rosenbaum BT, Schroeder ME, Wright AL

Author

Mary Elizabeth Schroeder MD Assistant Professor in the Surgery department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Aging
Animals
Animals, Newborn
Cat Diseases
Cats
Cochlea
Deafness
Differential Threshold
Disease Progression
Evoked Potentials, Auditory, Brain Stem
Female
Hearing
Male
jenkins-FCD Prod-468 69a93cef3257f26b866d455c1d2b2d0f28382f14