Exam Preview for 27867: Auditory Brainstem Responses (ABR) to Brief

Auditory Brainstem Responses (ABR) to Brief-tone Bone-conducted Stimuli

Please note: exam questions are subject to change.

1. The Joint Committee on Infant Hearing (2007) recommends the following to determine the degree and configuration of hearing loss in infants: Broad-band air-conducted ABR stimuli Frequency-specific air- and bone-conduction ABR stimuli Air-conducted ABR stimuli only and tympanometry Air- and bone-conduction click-ABR thresholds
2. Calibration of bone-conduction ABR stimuli should be conducted using: Published brief-tone Reference Equivalent Threshold Force Levels Adult bone-conduction behavioural levels determined at each clinical site The same Reference Equivalent Threshold Force Levels for air-conducted brief-tone stimuli The same Reference Equivalent Threshold Force Levels used for Visual Reinforcement Audiometry
3. The bone oscillator should be placed on the following skull location for infant testing: Occipital bone Forehead Temporal bone Parietal bone
4. The bone oscillator should be coupled to an infants head as follows: Hand-held by a parent on the temporal bone or using a calibrated elastic headband put in place by a parent Hand-held by a clinician or trained assistant on the temporal bone or using a calibrated elastic headband put in place by a clinician or trained assistant Always using an elastic head band placed by a parent Always using a pediatric-sized steel head band
5. Bone-conduction normal maximum levels for ABR testing are available for the following frequencies: 1000 and 2000 Hz 500 and 3000 Hz 500, 1000, 2000 and 4000 Hz 500 and 2000 Hz
6. When interpreting ABR waveforms, which of the following statements is true when a response cannot be evaluated? SNR much less than 1, RN< .08 µV, no repeatable peaks, visually flat SNR>2, RN=.11 µV, repeatable peaks SNR much less than 1, RN>.20 µV, no repeatable peaks, not visually flat SNR much less than 1, RN=.07 µV, visually flat
7. Which of the following will help isolate the test cochlea when conducting brief-tone bone-conduction testing in infants? Comparison of bone-conduction ABR thresholds at 500 and 2000 Hz Comparison of bone-conduction ABR thresholds obtained at the forehead and occipital bone Comparison of ipsilateral/contralateral asymmetries in two-channel EEG recordings using bone-conducted stimuli Ask the infant where s/he hears a 2000-Hz brief tone presented at 50 dB HL when the oscillator is placed on the forehead
8. When should clinical masking be attempted for bone-conduction ABR testing in infants? When the infant is restless before starting air-conduction ABR testing When air-conducted thresholds are within normal limits in both ears When air- and bone-conduction ABR thresholds are in the moderate range at 500 & 2000 Hz and the bone-conducted responses in the ipsilateral EEG channel are larger and earlier than in the contralateral EEG channel for both ears When air-conducted ABR thresholds are elevated and ipsilateral/contralateral asymmetries to bone-conducted ABR stimuli are ambiguous
9. Which of the following statements is correctly stated regarding the term "eHL" correction? This term refers to an "early Hearing Level" correction This term refers to an "exact Hearing Level" correction that accounts for gender and age differences in hearing sensitivity This correction factor converts click-ABR thresholds to 500-, 1000-, 2000-, and 4000-Hz behavioural thresholds determined using Visual Reinforcement Audiometry Correction factor used to estimate behavioural hearing threshold (dB HL) from the ABR threshold (dB nHL)
10. When should bone-conduction ABR testing be done during the diagnostic protocol? After air-conduction thresholds are established for both ears Always after all air-conduction, tympanometry & OAE testing has been completed After AC thresholds are shown to be elevated in at least one ear at 2000 Hz Before AC testing