Question

in electrocochleography (ecochg), an elevated summating potential/action potential (sp/ap) ratio is most suggestive of: *

central auditory processing disorder
ménières disease (endolymphatic hydrops)
otitis media
presbycusis

Explanation:

Analyze the clinical diagnostic test

Using the Electrocochleography knowledge point, we evaluate the components of the evoked potential response recorded from the cochlea and auditory nerve.

Evaluate the physiological markers

Using the Summating Potential knowledge point, we identify that an enlargement of this direct-current receptor potential relative to the action potential (AP) indicates basilar membrane displacement.

Correlate with clinical pathology

Using the Ménières Disease knowledge point, we link an elevated SP/AP ratio (typically greater than 0.35 to 0.40) directly to endolymphatic hydrops.

Rule out alternative options

We confirm that central auditory processing disorder, otitis media, and presbycusis do not characteristically alter the peripheral SP/AP ratio.

Answer:

• (A) Central auditory processing disorder
• (B) Ménière's disease (endolymphatic hydrops) (Correct answer)
• (C) Otitis media
• (D) Presbycusis