Module 12 Flashcards
Real-ear unaided response (REUR)
-REUR is the SPL, across frequencies, measured in an open and unaided ear canal for a signal that is delivered
-Variability in this measure across patients due to unique shape of their ear canal
What is the typical adult resonance?
Increase in SPL usually between 1500-7000 Hz, with a peal nearing 2700-3000 Hz
Real-ear unaided gain (REUG)
The gain or “boost” in sound provided by the pinna and ear canal itself when un-occluded (typically 10-20 dB of gain)
How to measure REUR & REUG
-Otoscopic exam
-Probe tube is placed in the ear canal, placed to approximately 5 mm of the TM (black marker to inter-tragal notch)
-Patient is placed in front of the verification equipment speaker
-Select and deliver a stimulus (usually broadband sound)
-Measure the REUR/REUG
Real-ear aided response (REAR)
-A REAR looks at the total response of the hearing aid delivered in the ear canal, taking into account the gain provided by the hearing aid and the patient’s ear canal when a signal is delivered
-Measured in dB SPL
Real-ear aided gain (REAG)
-A REAG looks at the total gain of the hearing aid delivered in the ear canal, taking into account the gain provided by the hearing aid and the patient’s ear canal when a signal is delivered
-REAG = difference of input and output with hearing aid active
Real-ear insertion gain (REIG)
-REIG is another method of verifying the hearing aid output (in dB)
-Insertion gain = real ear AIDED response - real ear UNAIDED response
T/F: REAR is preferred today over REIG
TRUE: it shows the total effect (hearing aid gain AND individual characteristics) and the performance of the hearing aid/benefit on our patient
Real-ear occluded response (REOR)
-The REOR measures how the hearing aid or earmold changes the REUR when the hearing aid is in and place and is turned OFF
Real-ear to coupler difference (RECD)
-Difference, as a function of frequency, between the output of the hearing aid in the ear and in coupler
-RECD takes into account unique differences in ear canals—creating a more tailored fitting
-Coupling to measure RECD may be done with an insert earphone or the patient’s earmold
Why is achieving RECD measures on pediatric patients ideal?
Smaller ear canal volumes will mean higher SPL than a standard 2cc coupler
What are some factors influencing RECD values (4)?
-Ear canal volume size (age dependant)
-Vents, slit leaks, open fittings
-Myringotomy tubes
-Perforations
T/F: microphone location effect (MLE) causes slightly less gain in CIC than BTE
FALSE: MLE causes slightly more gain in CIC than BTE
If we have 2cc values and wish to know the estimated real-ear equivalent (TEREO), we add the values of ___ and ___ together
RECD + MLE
If we have ear canal SPL values and we wish to know the coupler equivalent, we subtract values of ___ and ___
RECD - MLE