Hearing Flashcards
At what dB and Hz separates silence and sound?
0 dB at 1000Hz (threshold)
Normal conversation is ___ dB
60 dB
OSHA requires a hearing plan for > ____ dB
90
Concerts and headphones are >___ dB
110
Higher frequency sounds are transmitted near the ____
Stapes
Lower frequency sounds (<20 Hz) create pressure waves that go through the ____
Cochlea
they are below the threshold of hearing
Hyperacusis
abnormal sensitivity to sound
Conductive hearing loss
aka mechanical hearing loss OR bone conduction (BC)
any interference of sound wave tranmissions from external/middle ear -> inner ear
Sensorineural hearing loss
aka absolute hearing loss
deterioration of cochlea (bil) OR sudden hearing loss/tumors (unil)
central hearing loss
prob with CNS
ex. stroke
functional hearing loss
no organic cause
psychogenic - only real to the pt
behavorial cues for hearing loss
- leaning, turning one ear to sound
- mumbling
- irritability
- otalgia, dizziness, tinnitus
Pure Tone Test
aka Audiogram
tests ranges of Hz
250 - 8000Hz
Norm Human speech Hz and dB range
500 - 3000Hz AND 40-60 dB
if pt cannot hear you speak, infer 40-60 dB deafness (for the sticks)
The Weber Test
sensorineural hearing loss vs conductive
512 tuning fork
sensorineural hearing loss = CN 8
“Weber lateralized to LT” = LT conductive OR RT sensorineural
Rinne Test: BC > AC means?
Conductive hearing loss
Bone conduction testing eval the air/bone gap to check for ___ hearing loss
stimuates cochlea directly
conductive
noise induced hearing loss = high freq loss >/= ______ Hz
4000
speech banana
Presbycusis
old ppl can’t hear high freq
Tympanograms
creates air pressure -> graph of TM mobility
Tympanogram
DDx?
normal
Tympanogram
DDx?
Tympannogram
DDx?
Tympannogram
test used for?
BAER or ABR
brainstem audiometry evoked response OR Auditory Brainstem Response
Babies
Stim sound -> eval brainwaves
similar to EEG?
