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Hearing Aid Essentials: Prescriptive Fitting Approaches

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1.  Why are hearing aid prescriptions useful? To assist with hearing aid selection To provide a target for verification To provide a starting point for setting gain/output All of the above

2.  Carharts method for selecting hearing aid gain included: Gain equal to 1/2 of the hearing threshold Gain equal to 1/3 of the hearing threshold Comparative evaluations with speech testing Comparative evaluations with probe microphone measures

3.  Which of the following describes amplitude compression in hearing aids Gain is independent of input level Gain depends on input level (more gain for soft sounds) Gain depends on input level (more gain for loud sounds) Gain is independent of frequency

4.  What is a compression kneepoint? The threshold of activation The threshold of discomfort The degree to which gain is reduced in non-linear amplification The degree to which gain is increased in non-linear amplification

5.  Which of the following is a significant change from NAL-NL1 to NAL-NL2 Less compression Correction for bilateral fitting (~3 dB less gain) Etiology is considered (more gain for acquired losses) Separate targets for noise and for quiet

6.  Which of the following are factors considered by DSL v 5.0 Patient age Etiology (congenital versus acquired loss) Unilateral versus bilateral fitting All of the above

7.  For a child with congenital hearing loss, which of the following is most likely true? DSL v 5.0 and NAL-NL2 will prescribe similar gain NAL-NL2 will prescribe more gain than DSL v 5.0 DSL v 5.0 will prescribe more gain than NAL-NL2 Depending on the patient's gender, either NAL-NL2 or DSL v 5.0 could prescribe the most gain

8.  In general, what is the relationship between the preferred listening levels of children and adults? Children prefer a higher listening level than all adults Adult and children prefer the same listening level Only experienced hearing aid users prefer a higher listening level than children Only new hearing aid users prefer a higher listening level than children

9.  According to the data presented by Abrams et al (2012), what is the relationship between perceived hearing aid benefit and using a prescriptive fitting method? Hearing aid benefit might be higher if you use manufacturer first fit Hearing aid benefit might be higher if you use a prescriptive method Hearing aid benefit is not related to type of fitting There is too much variability to relate type of fitting and benefit

10.  For a flat 60 dB, sensorineural hearing loss, approximately how much gain would be prescribed for a middle frequncy? 0 - 10 dB 20 - 30 dB 60 - 70 dB 80 - 90 dB