Pure Tone Audiometry Flashcards
T/F Pure tone audiometry is the most common behavioral procedure to test for degree and etiology of a hearing loss
T
What is the audiological definition of threshold?
The SOFTEST level of sound a person can detect 50% of the time
T/F The human ear is sensitive to all
frequencies equally
F
What is our range of auditory sensitivity? Why is this?
3,000-3,500 Hz
Result of ear canal resonance
Why are we also sensitive at 1,500 HZ?
Result of middle ear resonance
Dynamic range across frequencies is called:
Audibility area
What is dynamic range?
It is the range between our upper limits of tolerance and threshold of audibility
What does it mean to say that LDL is a flat function?
For the average person, their LDL is the same for every frequency – 130dB
Do audiograms use dBHL or dBSPL?
dBHL!!!!
What is the purpose of using an audiogram?
It gives us a flat line to compare normal hearing
What are the options of transducers?
Headphones, inserts/earphones, bone conduction oscillator, and loudspeaker
Compare and contrast full range audiometer with limited range audiometer and screening audiometer in terms of signals, transducers, and masking abilities
Full: Signals - pure tones, speech stimuli Transducers - all transducers Masking abilities - all masking abilities Limited: Signals - pure tones Transducers - headphones and bone oscillator Masking abilities - white noise masking Screening: Signals - pure tones Transducers - earphones Masking abilities - none
If you don’t get a response at 30dBHL for familiarization, what dB should you go to?
50dBHL (if still no response, then 10 dB increments up from there until a response in obtained)
What is familiarization?
Familiarization is a test run to make sure the clients know what they’re doing before you start collecting information
What are the sites of lesion for a conductive hearing loss?
Outer and middle ear
During threshold determination what happens when you get a response? No response?
Response? Decrease 10dB
No response? Increase 5dB
When a difference of 20 dB or more exists between the threshold values at any two adjacent octave frequencies what do you do?
Measure inter-octaves
T/F When you place the bone conduction oscillator on the right mastoid, only the right cochlea is stimulated
F! Bone conduction stimulates both cochleas unless you use masking
What are the 5 items that you look for when interpreting an audiogram?
Which ear Symmetry between ears Slope of loss Nature of the loss Degree of loss
Pure Tone Average is the average of what three frequencies?
500, 1000, 2000Hz
What are the sites of lesion for sensorineural hearing loss?
Cochlea
Auditory Nerve
Central Auditory Pathways
What are the steps of conducting on audiometric evaluation?
Obtain AC results
Obtain BC results
Compare thresholds
Determine type of hearing loss and site of lesion
If AC and BC results are the same what type of hearing loss is this and what is the site of lesion?
Sensorineural hearing loss
Inner ear
If AC results show a hearing loss but BC results show normal hearing, what is the hearing loss and site of lesion?
Conductive hearing loss
Outer or middle ear
What is the definition of the symmetry of hearing loss
A difference in the two ears with respect to degree and slope
What is a considered a significant air-bone gap? What is not considered significant?
15dB IS significant
10dB is NOT significant
With a mixed hearing loss, air conduction results will always have a higher degree of hearing loss. Why is this?
The sound has to travel through the sensorineural impairment AS WELL AS the conductive impairment, making it a double whammy for that sound wave!
List the range in Hz for each degree of hearing loss:
0-25 Normal 26-40 Mild 41-55 Moderate 56-70 Moderately-Severe 71-90 Severe 91+ Profound
When do you use a two-frequency pure tone average?
When there is a significant difference in threshold (20 dB or greater) between two frequencies, then you can calculate a two-frequency PTA
What are the 9 slopes of hearing loss?
Flat loss Gradual slope Rising slope Sharply sloping Precipitously sloping Fragmentary slope Notch slope Trough slope Cookie bite slope
What is the definition of precipitously sloping?
Near normal in the low frequencies, sudden drop at higher frequency
What slope is created by only having responses in the left corner of an audiogram?
Fragmentary slope
What is the definition of a trough shaped slope?
Better hearing in the mid-frequencies
What is the definition of a cookie bite slope?
Poorer hearing in the mid-frequencies
