Audiologic Assessment & Diagnosis Flashcards

Which tympanometric peak pressure value is most consistent with Eustachian tube dysfunction?

Answer: -200 daPa

Negative middle ear pressure more negative than -150 daPa suggests Eustachian tube dysfunction impairing pressure equalization.

A patient shows absent acoustic reflexes bilaterally at all frequencies with normal tympanograms. The most likely site of lesion is:

Answer: Auditory nerve or brainstem

Absent acoustic reflexes with normal tympanograms and middle ear function point to retrocochlear pathology at the auditory nerve or brainstem level.

The carhart notch on bone conduction audiometry is a mechanical artifact characteristically seen at which frequency?

Answer: 2000 Hz

The Carhart notch is a 2000 Hz bone conduction dip caused by the resonant frequency of the ossicular chain being disrupted in otosclerosis.

Which ABR wave is generated by the cochlear nucleus?

Answer: Wave III

Wave III of the ABR is generated by the cochlear nucleus (CN) in the brainstem.

In otoacoustic emission testing, which type of OAE is elicited by presenting two simultaneous pure tones (f1 and f2)?

Answer: Distortion product OAE (DPOAE)

DPOAEs are generated by the nonlinear interaction of two simultaneous primary tones (f1 and f2) in the cochlea.

A child presents with a flat audiogram showing hearing loss in the 60-70 dB HL range with absent OAEs and absent ABR at high intensities. Which diagnosis is most consistent?

Answer: Severe sensorineural hearing loss

Flat severe SNHL with absent OAEs and absent ABR indicates widespread outer hair cell and auditory nerve dysfunction consistent with severe sensorineural loss.

Which masking level difference (MLD) result indicates normal binaural processing?

Answer: 10-15 dB release from masking

Normal binaural processing yields 10-15 dB of release from masking when comparing SπN0 to S0N0 conditions.