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20Q: ABR Assessment in Infants - Getting it Right When it Matters the Most

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1.  To analyze waveforms from an ABR for the purpose of infant hearing assessment, a good starting point for the display parameters is: make the waveforms as large as possible set the display scale so that 1 msec on the x-axis is equal in length to .1 microvolt on the y-axis (or .03 microvolts on the y-axis for near-threshold responses) default settings for your equipment none of the above

2.  To minimize noise for a good recording, Dr. Wolfe preps the skin to get an electrode impedance of: 1 killiohm for all sites 2 killiohm for all sites 1 killiohm for forward; 5 killiohm for mastoid 10 killiohm for mastoid

3.  Dr. Wolfe uses the following electrode placement for newborns: _____ for the non-inverting electrode and ______ for the common/inverting electrodes. Cz, mastoid Cz, chin High forehead, mastoid High forehead, Cz

4.  To determine which cochlea is providing a bone conduction response, it is necessary to use: ASSR click stimuli otoscopy masking

5.  To reduce noise for the clearest waveforms in infant ABR assessment and maintain a good amplitude of the response, it is recommended to: test the infant at naptime and withhold feeding until test time set the recording filters as follows: high-pass cut-off of 30 Hz & low-pass cut-off of 1500 Hz eliminate outside noise sources by testing in a soundbooth or quiet room with minimal residual noise all of the above

6.  Prior to beginning the ABR assessment in infants, Dr. Wolfes typical protocol includes: acoustic immittance and OAEs when possible visual reinforcement audiometry ear canal irrigation all of the above

7.  Sedation may be required when conducting ABR assessment for: audiology students newborns infants older than 6 months, and young children all of the above

8.  A drawback of conducting ABR assessment when the child is under light anesthesia is: it is costly due to personnel required and facility costs insurance may not reimburse the cost scheduling is more complicated since specialty personnel, equipment and room may be needed all of the above

9.  Using the correction factors in the article, if an ABR threshold to a 1000 Hz toneburst is 50 dB nHL, then the estimated behavioral threshold is: 60 dB eHL 45 dB eHL 40 dB eHL 55 dB eHL

10.  According to Dr. Wolfe, hearing assessment on a soundly sleeping infant using ABR typically takes: 20 - 60 minutes 15 minutes 2 hours 90 minutes