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Common Errors in ABR Recording and Analysis

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1.  The authors of the first comprehensive description of the ABR in humans were: Hall and Mueller Ricketts and Hornsby Jerger and Carhart Jewett and Williston

2.  Which of the following is a reasonable step for enhancing wave I with click stimulation at the beginning of ABR measurement: Change from insert earphones to supra-aural earphones Increase from an intensity level of 70 dB nHL to 80 or 85 dB nHL Attempt bone conduction ABR recording Change from a click stimulus to a 500 Hz tone burst stimulus

3.  Criteria for optimal inter-electrode impedance prior to ABR measurement include: < 10,000 ohms for each electrode < 5,000 ohms for the ground (common) electrode < 5,000 ohms for each electrode < 5,000 ohms for each electrode and balanced impedance (< 2000 ohms)

4.  A reasonable display gain in ABR measurement is: 0.1 microvolt 0.30 microvolt 1.0 microvolt 15-msec

5.  A clinically feasible and efficient stimulus presentation rate in pediatric ABR measurement with tone burst stimuli is: 11.1/sec 21.1/sec 37.7/sec 5 to 10 minutes per ear

6.  Clinical indications for bone conduction ABR include: risk factors for conductive hearing loss risk factors for sensorineural hearing loss normal immittance findings (tympanometry) normal air conduction ABR

7.  Efficiency in ABR recording is enhanced with which one of the following criterion for stopping stimulus presentation for a given ear and stimulus: Stop after 1000 stimuli are presented Stop after 2000 stimuli are presented Stop after 3000 stimuli are presented Stop when SNR is ≥ 3.0 (Signal = ABR wave V; Noise = EEG)

8.  Research shows that ABR test time is decreased with the application of which one of the following techniques: Condensation stimulus polarity High pass filter setting of > 150 Hz Chirp clicks and tone bursts Insert earphones

9.  Using insert earphones during ABR testing: Increases risk of ambient noise impacting testing Is not possible with infants as their ear canals are too small May lead to collapsed canals helps attenuate ambient noise, increases inter-aural attenuation, and eliminates collapsed canals

10.  Each of the following subject factors must be taken into account in ABR analysis EXCEPT? Gender Body temperature Anesthesia Sedation