Instrument Fitting Flashcards

During a hearing aid fitting verification, the functional gain measurement is performed by comparing:

Answer: Aided and unaided soundfield thresholds

Functional gain is the difference in dB between unaided and aided soundfield pure-tone thresholds, measuring how much audibility the hearing aid adds.

A patient with a steeply sloping high-frequency hearing loss is fitted with open-fit RIC devices. A common complaint is difficulty understanding speech in noise. The MOST appropriate adjustment is:

Answer: Switch to a closed dome or custom earmold

Switching to a closed dome or custom earmold improves low-to-mid frequency retention in the canal, reducing the low-frequency noise that leaks in through the open vent and competing with speech.

Which outcome measure is specifically designed to assess hearing aid benefit in four listening situations important to the patient?

Answer: APHAB (Abbreviated Profile of Hearing Aid Benefit)

The APHAB measures benefit across four subscales: Ease of Communication, Background Noise, Reverberation, and Aversiveness of Sound.

For a patient whose audiogram shows a 'cookie bite' configuration (greatest loss in the mid frequencies), the fitting challenge is primarily:

Answer: Providing mid-frequency gain without over-amplifying highs and lows

Cookie bite losses require selective mid-frequency amplification while keeping low and high-frequency gain appropriate to avoid distortion or discomfort.

When documenting a hearing aid fitting for a minor patient, which additional step is legally and ethically required compared to adult fittings?

Answer: Parental or guardian informed consent must be obtained

Fitting hearing devices on minors requires informed consent from a parent or legal guardian, as the child cannot legally consent on their own behalf.

Which of the following is the MOST important reason to perform real-ear measurement rather than relying solely on manufacturer first-fit settings?

Answer: To verify the hearing aid meets target gain for the individual's ear canal acoustics

Individual ear canal acoustics vary significantly; real-ear measurements verify that the prescribed target gain is actually delivered at the tympanic membrane for that specific patient.

A dispensing professional is troubleshooting intermittent sound from a BTE hearing aid. After ruling out the battery and programming, the NEXT most likely cause to check is:

Answer: Broken or corroded tubing and earmold connection

Intermittent sound in BTE devices is frequently caused by a cracked, blocked, or corroded acoustic tube or earhook connection disrupting sound transmission.