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ENT · Ear and audiology: audiogram of mixed loss
Sample itemAn audiogram shows an air conduction threshold of 70 dB and a bone conduction threshold of 40 dB in the same ear at the same frequencies. How is this loss classified?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
A. Mixed hearing loss
A raised bone conduction threshold shows a sensorineural component, and the gap between air and bone shows a conductive component of 30 dB. Together this is a mixed loss, as seen in advanced otosclerosis or chronic otitis media with cochlear damage.
Option by option
A. Mixed hearing loss (correct)
Correct. Both elevated bone thresholds and an air-bone gap are present.
B. Pure conductive hearing loss
Pure conductive loss has normal bone conduction.
C. Normal hearing
Thresholds of 40 and 70 dB are not normal.
D. Pure sensorineural hearing loss
Pure sensorineural loss has no air-bone gap.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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