EDAU 170 Quiz 2 - study guide
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24 Terms
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Frequency range used when testing hearing thresholds in audiology booths
250-8000 Hz
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Before audiometers, how was hearing tested?
Using tuning fork tests and whisper tests.
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Definition of audiometric threshold
The faintest level at which a patient will respond consistently for at least 50 percent of the time.
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Typical responses accepted as threshold in audiometric testing
2 out of 3 stimulus presentations.
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Which testing helps determine the type of hearing loss?
Bone conduction tests.
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Which testing helps determine the degree of hearing loss?
Air conduction tests.
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Starting frequency for the audiogram
1000 Hz at 40 dB for adults.
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Should patients see the tester during hearing tests? Why?
No, to prevent guessing based on the tester's facial expressions.
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What is the 'Down 10, Up 5' method?
A technique for finding hearing thresholds.
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If a patient responds at 30 dB, what is the next presentation level?
Decrease by 10 dB.
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If a patient does not respond at 30 dB, what is the next presentation level?
Increase by 5 dB.
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If a patient responds at 20 dB, what is the next presentation level?
Decrease by 10 dB.
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When is inter-octave testing (e.g., 3000 Hz) necessary?
If there is a 20 dB threshold difference between octaves.
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Symbols for right and left ears air conduction unmasked on an audiogram
O for right, X for left.
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Symbols for right and left ears air conduction masked on an audiogram
triangle for right, square for left.
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Symbols for right and left ears bone conduction unmasked on an audiogram
< for right, > for left.
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Symbols for right and left ears bone conduction masked on an audiogram
[ for right, ] for left.
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Ideal placement for the bone oscillator
On the mastoid, or on the forehead if necessary.
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Type of hearing loss when air conduction indicates loss but bone conduction is normal
Conductive hearing loss.
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When the air conduction thresholds indicate hearing loss, and we obtain the bone conduction thresholds at the same dB levels as our air conduction thresholds, what type of hearing loss do we have?
Sensorineural hearing loss.
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Interaural attenuation for headphones
40 dB.
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Interaural attenuation for insert earphones
55 dB.
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Interaural attenuation for bone oscillator
0 dB.
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Do you need to mask the right ear when testing the left if there’s a 40 dB gap?
Yes, masking is needed.
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