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ComD 438 Special Topics

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Elizabeth Perry

on 26 November 2012

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Transcript of ComD 438 Special Topics

Special Topics Otoacoustic emissions
OAEs for short
Used in hospitals routinely for newborn hearing screenings
Can also help determine site of lesion
Reflects normal OHC function
Several different types are used clinically Auditory Brainstem Response
Can give you a rough estimate of hearing threshold for mid- to high frequencies
Why might ABR be considered the "gold standard" in newborn hearing screenings?
If this is the case, why don't we use it routinely instead of OAEs?
Also used in difficult-to-test individuals: why?
Electrocochleography (ECochG):
Records stimulus-related responses or electrical potentials of the inner ear and auditory nerve
Records the cochlear microphonic (CM)
Records the 8th nerve action potential
Does NOT record the endocochlear potential Why would we use ECochG?
Identify and monitor Meniere's disease
Used during operations on the brainstem or cerebellum
Can help diagnose auditory neuropathy
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