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ENT · Audiology: noise-induced hearing loss
Sample itemA textile mill worker with 15 years of exposure to loud machinery has an audiogram with a sharp dip at 4000 Hz in both ears and recovery at 8000 Hz. What is the diagnosis?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
D. Noise-induced sensorineural hearing loss
A 4 kHz notch with partial recovery at higher frequencies is the classic audiometric signature of chronic noise damage. Outer hair cells in the basal turn are lost first. Otosclerosis would give a conductive loss and a 2 kHz bone dip.
Option by option
A. Ototoxicity from aminoglycosides
Aminoglycoside ototoxicity affects high frequencies progressively without a notch and recovery.
B. Otosclerosis
Otosclerosis is conductive with a Carhart notch at 2 kHz.
C. Acoustic neuroma
Acoustic neuroma is usually unilateral with retrocochlear features.
D. Noise-induced sensorineural hearing loss (correct)
Correct. A bilateral 4 kHz notch with recovery is typical of noise damage.
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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