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Good Practices in Auditory Brainstem Response, Part 1

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1.  What patient data must be entered in order to utilize the ABR normative data? Birthdate Gender Birthdate & Gender Name only

2.  When using common mode rejection the voltage difference is measured for the Active electrode Reference electrode Active and Reference electrode Ground electrode

3.  What should electrode impedance values be? <5 kOhm for each electrode and <2 kOhm between electrodes Impedance is not important Only interelectrode impedance matters <20 kOhm

4.  In ABR, what response parameter is most obviously different between infant ABRs and adult ABRs? Wave I is larger in infant responses Wave I is smaller in infant responses Wave V is larger compared to wave I in infant responses Wave II is the predominant wave in infant responses

5.  Question 5: In a normal ear, what happens to wave V as you decrease intensity? Wave V latency increases Wave V latency decreases Wave V amplitude increases Nothing, it stays the same

6.  What does a latency-intensity function look like for a conductive hearing loss? Steeply sloping Parallel to normal function Normal at high intensities; rising at the low intensities None of the above

7.  Why is the Wave V of the standard ABR dominated by energy in the 2-4 kHz range? Because the click stimulus only has energy at 2-4 kHz Because low frequency responses are phase canceled leaving only the high frequency responses Because only neurons between 2-4 k Hz are synchronous None of the above

8.  What 2 measurements below are used in standard ABR to determine if a tumor is present? Wave V amplitude Wave I-V interwave latency Interaural Wave V latency difference Wave III latency B and C

9.  Why is it more difficult to obtain a quality recording for a 500 Hz toneburst? Neuronal firing is less synchronous at the lower region of the cochlea 500 Hz toneburst has more energy 500 Hz toneburst does not have a good stimulus spectrum None of the above

10.  If a cochlear microphonic is detected, it suggests The brainstem is functioning normally The outer hair cells are intact and there is some neural response That hearing is within normal limits That detection alone suggests the patient has auditory neuropathy without the need to perform other tests