Understanding Audiogram and Employee Follow-Up Flashcards
(46 cards)
hearing test are documented on these two basic types of audiograms
serial
graphic
documents hearing Air Conduction thresholds numerically
serial audiograms
usually used by audiologists
results are displayed on a chart using symbols to identify thresholds
graphic audiograms
normal hearing limits
-10 to 25 dB
mild hearing loss
30 to 40 dB
moderate hearing loss
45 to 55 dB
moderate-severe hearing loss
60 to 70 dB
severe hearing loss
75 to 90 dB
profound hearing loss
90+ dB
what constitutes normal hearing
threshold below 25 dB
pattern usually indicates a conductive hearing loss
flat audiograms
what else can cause flat loss
equipment malfunction
non-organic hearing loss
most common audiometric pattern
always indicate sensorineural involvement
sloping configuration
when does noise notch usually occur
4000 Hz
but can be anywhere 3000-6000 Hz
hearing improves in higher frequencies
NOT caused by noise
typically conductive
rising configuration
exception to rising configuration
meniere’s disease
hearing loss that occurs in one ear only
difference of 40-70 dB
unilateral hearing loss
hearing loss occurs in both ears, but one is considerably worse
greater than or equal to 25 dB @ consecutive frequencies
asymmetrical hearing loss
performed by audiologist
Bone Conduction (BC)
Masking
bypasses the outer and middle ears and stimulates the inner ear
BC testing
when BC thresholds are within normal limits and better than AC thresholds
conductive hearing loss
when BC thresholds are about the same as AC thresholds
Sensorineural hearing loss
BC thresholds are better than AC, but not within normal limits
mixed hearing loss
used by audiologist to prevent crossover in patients with unilateral or asymmetric hearing loss
masking
