Hearing loss Flashcards
normal dB level on audiogram
< 20 (NB the top of the graph starts at -10 and then it goes positive as you go down). so it’s anything ABOVE the 20 line on the graph, but this is moving more negative
audiogram sensorineural hearing loss
both lines lower (as air conduction relies on sensorineural being intact, so if SN is reduced, air will be too)
audiogram conductive hearing loss
only air reduced (when headphones are placed on bone, it hears perfectly normally)
audiogram mixed hearing loss
both reduced, gap between the two
what is the name for age related hearing loss
presbycusis
what are the first changes on the audiogram in presbycusis
high frequency, sensorineural hearing loss pattern (i.e. both lines drop on the right hand side of the graph)
what is an acoustic neuroma correctly called
vestibular schwannoma
where do vestibular schwannomas occur and what sx can they cause
CN VIII (vertigo, hearing loss, tinnnitus)
but can compress
CN V: paraestheisae, absent corneal reflex
CN VII: facial palsy
what is otosclerosis
normal bone is replaced by vascular spongy bone. stapes becomes fixed at the oval window
inheritance pattern otosclerosis
AD
presentation otosclerosis
age 20-40 conductive hearing loss tinnitus normal TM FHx
rx otosclerosis
hearing aid
stapedectomy
weber vs rinne which one is which
rinne you put the for behind the pinne
e.g. sensorineural hearing loss in left ear. what do weber vs rinne show
webers - louder in unaffected side
rinne - air conduction > bone. air conduction still seems louder, even if it is reduced compared to the unaffeted side
e.g. conductive hearing loss in left ear. what do weber vs rinne show
weber - louder in affected side. sound cannot excape ear canal
rinne - BC > AC
