Module 12 Flashcards

1
Q

Real-ear unaided response (REUR)

A

-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

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2
Q

What is the typical adult resonance?

A

Increase in SPL usually between 1500-7000 Hz, with a peal nearing 2700-3000 Hz

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3
Q

Real-ear unaided gain (REUG)

A

The gain or “boost” in sound provided by the pinna and ear canal itself when un-occluded (typically 10-20 dB of gain)

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4
Q

How to measure REUR & REUG

A

-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

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5
Q

Real-ear aided response (REAR)

A

-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

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6
Q

Real-ear aided gain (REAG)

A

-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

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7
Q

Real-ear insertion gain (REIG)

A

-REIG is another method of verifying the hearing aid output (in dB)
-Insertion gain = real ear AIDED response - real ear UNAIDED response

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8
Q

T/F: REAR is preferred today over REIG

A

TRUE: it shows the total effect (hearing aid gain AND individual characteristics) and the performance of the hearing aid/benefit on our patient

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9
Q

Real-ear occluded response (REOR)

A

-The REOR measures how the hearing aid or earmold changes the REUR when the hearing aid is in and place and is turned OFF

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10
Q

Real-ear to coupler difference (RECD)

A

-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

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11
Q

Why is achieving RECD measures on pediatric patients ideal?

A

Smaller ear canal volumes will mean higher SPL than a standard 2cc coupler

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12
Q

What are some factors influencing RECD values (4)?

A

-Ear canal volume size (age dependant)
-Vents, slit leaks, open fittings
-Myringotomy tubes
-Perforations

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13
Q

T/F: microphone location effect (MLE) causes slightly less gain in CIC than BTE

A

FALSE: MLE causes slightly more gain in CIC than BTE

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14
Q

If we have 2cc values and wish to know the estimated real-ear equivalent (TEREO), we add the values of ___ and ___ together

A

RECD + MLE

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15
Q

If we have ear canal SPL values and we wish to know the coupler equivalent, we subtract values of ___ and ___

A

RECD - MLE

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16
Q

How much reserve gain do we ideally want at each frequency?

A

10-15 dB

17
Q

Why is having reserve gain important (3)?

A

-Hearing sensitivity changes (aid can be reprogrammed to meet needs)
-Volume control (accounts for listening preference)
-Minimizing distortion (aid is not working at its maximum level)

18
Q

Output Sound Pressure Level with 90 dB Input (OSPL90)

A

-How much power output is the hearing aid capable of?
-Measuring a 90 dB stimulus, across a frequency range is presented, and the output is measured in the coupler

19
Q

High frequency average output sound pressure level 90 dB input (HFA-OSPL90)

A

-Measuring the average output of the frequencies of 1000 Hz, 1600 Hz, and 2500 Hz with a 90 dB stimulus

20
Q

Response curve full-on gain with 50 dB inputs (FOG)

A

Measuring the output of the hearing aid when hearing aid gain is set to maximum, with a softer input (using a 50 dB stimulus)

21
Q

High frequency average full-on gain (HFA-FOG)

A

Measuring the average output with a 50 dB input of the frequencies of 1000 Hz, 1600 Hz, and 2500 Hz

22
Q

Reference test gain (RTG)

A

-Measuring the response of the HA at an appropriate user setting with a softer input of 60 dB (near average speech)

23
Q

Total harmonic distortion (THD)

A

-Measuring if there’s good fidelity of the signal from input to output
-Distortion measured in percentages

24
Q

Equivalent input noise (EIN)

A

Measuring how much internal noise the hearing aid is creating itself

25
Q

Battery current drain

A

-Measuring if the drain of the battery is reasonable (in mA)
-Measured with 65 dB and 90 dB inputs