What are the differences between conductive deafness and sensorineural deafness?
A. No differences exist; they are two names for the same pathologic condition.
B. Acoustic trauma, ototoxic drugs, or disease cause conduction deafness; excessive wax in the outer ear or otitis media cause sensorineural deafness.
C. Conduction deafness involves the outer or middle ear; sensorineural deafness involves the receptor cells and/or cochlear nerve.
D. Conduction deafness involves the cochlear nerve; sensorineural deafness involves the outer or middle ear.
ANS: C
Rationale: Conductive deafness occurs when transmission of vibrations is prevented in the outer or middle ear. The common causes of conductive deafness are excessive wax in the outer ear canal or otitis media. Sensorineural deafness, as a result of damage of the receptor cells and/or the cochlear nerve, is less common than conductive deafness. The usual causes are acoustic trauma, ototoxic drugs, Ménière's disease, and acoustic neuroma.
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