CH. 6 - Pure-tone audiometry Flashcards
electronic instrument used by audiologist to quantify hearing
Audiometer
during an audiogram, introducing sound to one ear while testing other to eliminate residual bone conduction factor
mask
type of HL that can be conductive, sensorineural or mixed
peripheral HL
ie “between the ears”; extent to which hearing sensitivity is same in both ears or better in one than other
Interaural symmetry
amount of reduction in intensity that occurs as a signal crossover over the head from one ear to other
Interaural attenuation
what are the two main types of audiometers?
clinical/diagnostic
screening
device audiologists use to present sound (ie insert earphones)
Transducer
the dial in an audiometer that controls intensity
attenuator
part of an audiometer responsible for selecting frequency
Oscillator
the part of an audiometer that you need to push in order to play a tone. Often you’ll hold for as long as you want it to play
interrupter switch
hold your interrupter switch for around __
2-3 seconds
what is this?
audiometer
three types of earphones
insert (in ear canal), supra-aural (normal headphones), circumaural (dome-shaped cushion over ear)
these two signals are mostly used for masking
broad-band and narrow-band
this part of the audiogram converts energy from audiometer into acoustic/vibratory energy
transducer
what are three reasons insert earphones are industry standards instead of supra-aural
-Normal earphones can cause ear canals to collapse/close for older patients
-Normal earphones have inadvertent bone conduction
-less errors putting them on
what is the organization that sets the standards for calibrating audiometry equipment
ANSI (american national standards institute)
what is the goal of using an audiometer to make an audiogram?
establish hearing threshold sensitivity across range of audible frequencies important for human communication
what is a pure-tone average?
mean of air-conduction thresholds at 500, 1k and 2k Hz
type of HL
mixed
type of HL
sensorineural
type of HL
conductive
if air conduction results are normal, what does that mean?
person has normal hearing
if air conduction results are not normal, what does that mean?
there is some type of HL and we have to do more tests
what is it called when sound becomes so loud in one side it is perceived on other side
crossover
what is the interaural attenuation for bone conduction?
0 dB
when conducting bone conduction test, when do you use masking?
always
if a person has severe to profound HL via air conduction and no response via bone conduction, what is the type of loss?
sensorineural
