Audiometry Flashcards
What are the two types of placements for BC and which one is better?
- Mastoid : strength of vibration needed is smaller (more sensitive) and better results.
- Forehead : less likely to move.
We use mastoid placement more because the results are more sensitive.
What frequencies make up PTA?
500, 1000, 2000
What is a tactile response and why is it important?
When performing BC, if the loss is significant instead of the patient hearing the stimulus they will FEEL the vibration.
It is important because it tells us if the response was actually “heard” or if it is simply the vibration they are feeling (this would result in a no response).
What is the advantage of using inserts over supra headphones?
Inserts have a large Interaural attenuation compared to supra (55 to 40), meaning that there is less chance for cross-over.
Why do we use masking procedures?
To make sure that the ear were testing is not getting help or cross over from the other ear.
When would we mask for AC and when would we mask for BC?
AC: if the difference in thresholds in 55 or more when using inserts or 40 or more when using supra
BC: if the difference between AC and BC threshold is more than 10 dB
Which dB scale is used when calibrating a headphone in an ear simulator?
DB SPL
What are UCLs and why are they important?
They are the threshold at which sounds are uncomfortably loud for the patient.
They are important because we make sure hearing aids do not exceed this level.
What is the difference between SDT and SRT?
SDT: speech detection threshold - used for those who cannot speak English or are cognitively delayed/impaired. It is identifying when a word is said.
SRT: speech recognition threshold - used most of the time to validate audiometry results with PTA (needs to be within 10 dB of one another to be valid). A patient repeats words
What is WRS? Why is it important?
Word recognition scores: very important because it tell us if the auditory nerve is functioning well.
Ex. I can increase sound to make it audible for someone with hearing loss, they can repeat the words well - tells me their nerve is okay.
Some people i increase volume to where they can HEAR but they can’t UNDERSTAND what is being said: too much distortion.
When would you mask for WRS?
When there is a chance the other ear could hear the words at 500, 1000, 2000, or 4000 Hz.
What is one test we could do to rule out retrocochlear hearing loss?
Roll - over: we take the maximum score - minimum score and divide by max score. If the score is larger than 0.4, it is considered to be a sign of retrocochlear pathology.
