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Abrupt (sharp cut) type sensorineural hearing loss--a human temporal bone study--.

Y Nomura, K Kitamura

    Auris, Nasus, Larynx
    |January 1, 1979
    PubMed
    Summary
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    This study reports histopathology of abrupt sensorineural hearing loss in a Takayasu

    Area of Science:

    • Oto-neurology and Histopathology
    • Vascular Inflammation and Auditory System

    Background:

    • Investigating the histopathological basis of bilateral abrupt (sharp cut) sensorineural hearing loss.
    • Examining a case associated with Takayasu's arteritis, a systemic inflammatory condition.

    Observation:

    • Significant loss of outer hair cells and inner hair cells in the basal cochlear regions bilaterally.
    • Clear demarcation between healthy and affected areas of the organ of Corti.
    • Substantial cochlear neuron loss observed in the affected basal cochlear segments.

    Findings:

    • Histopathology reveals severe degeneration of cochlear hair cells and neurons.
    • Absence of vascular abnormalities within the cochlea and internal auditory canal.
    • The observed hearing loss pattern correlates with basal turn cochlear pathology.

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    Implications:

    • Suggests abiotrophy of the organ of Corti and cochlear neurons as a cause for this hearing loss type.
    • Highlights the potential role of disposition or hereditary factors in the etiology.
    • Provides insights into the pathological mechanisms underlying abrupt sensorineural hearing loss.