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NBME 23 Answers

nbme23/Block 3/Question#33

A 78-year-old man has had progressive loss of ...


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submitted by mousie(88),

My understanding if BC>AC this is abnormal = conductive hearing loss = otosclerosis VS Sensoryneural hearing loss will have normal AC>BC = loss of hair cells

dentist  VS: progressive unilateral hearing loss, doesn't affect Rinne Test, associated with NF2 and actor Mark Ruffalo Otoslcerosis is (usually....) progressive bilateral hearing loss, BC > AC. source +  

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submitted by hello(83),

can someone please explain this?

thomasburton  My reasoning was BC>AC so this must be a conductive problem (which to me means something middle ear or out) so usually I think something blocking air flow or impeding the ossicles. You can rule out all other answers as they are all causes of sensorineural (AC>BC). +1  

1) know that BC>AC = conductive hearing loss 2) conductive hearing loss means issue with structure before the inner ear 3) everything else occurs in the inner ear or in the brain