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ABR: An Illustration of Auditory Dysfunction Through Clinical Cases, Presented in Partnership with Rush University

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1.  The ABR is a test of synchronous neural function not a direct test of hearing used to estimate hearing sensitivity all of the above

2.  The neural generator sites for waves I, III, and V of the ABR are proximal portion of cn.VIII, cochlear nucleus, and lateral lemniscus distal portion of cn.VIII, cochlear nucleus, and inferior colliculus distal portion of cn. VIII, superior olivary complex, and Heschl’s gyrus proximal portion of cn.VIII, cochlear nucleus, and superior olivary complex

3.  Which of the following is the best strategy to rule out AN/AD? Decrease stimulus intensity Alter stimulus rate Reverse stimulus polarity Analyze I-V interwave latency

4.  You performed an ABR study on a patient with a flat moderately severe sensorineural hearing loss. Which of the following characteristics of the click-evoked ABR waveform do you expect to see? Inversion of the waveform with a change in stimulus polarity Elevated wave V threshold Prolonged I-III, III-V, and I-V interwave latencies None of the above

5.  Click-evoked ABR waveform characteristics of conductive hearing loss include prolonged absolute latencies prolonged interwave latencies normal interwave latencies a and c

6.  Kernicturus is a severe form of hyperbilirubinemia is typically treated with an exchange transfusion develops when high levels of bilirubin cross the blood-brain barrier All of the above

7.  An individual with myelomeningocele has spina bifida may have intact OAEs will most likely have an abnormal ABR study all of the above

8.  Research indicates that unmasked bone-conduction ABR testing on a young infant can provide ear-specific information due to increased interaural attenuation. Which of the following suggests that waveforms are being generated by the ipsilateral ear? Prolonged wave V latency Reduced wave V latency Normal wave V latency Prolonged I-V interwave latency

9.  By definition, a broadband click is not a frequency-specific stimulus. What is the generally accepted frequency range that is tested by the broadband click? 2000-3000 Hz 500-4000 Hz 2000-4000 Hz None of the above

10.  You have just completed air-conduction testing with a click stimulus on an autistic 7-year old child. Results suggest the presence of a severe sensorineural hearing loss in one ear. While the child is still under sedation, what test(s) would you want to perform next? Frequency-specific air-conduction testing with tone burst stimuli Unmasked bone-conduction testing Masked bone-conduction testing a and c