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Evoked Potentials Part 1: Good Practice and Auditory Brainstem Response

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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.  When using a 2 channel recording, the CH1/CH2 active electrode is BEST positioned where? low forehead earlobe mastoid Cz

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

5.  What are common reasons for a noisy tracing? Use of cell phones around equipment Use of non grounded plug Equipment in use too close to other monitors/computers in the area All of the above

6.  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 comparted to Wave I in infant responses Wave II is the predominant wave in infant responses

7.  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

8.  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 low intensities None of the above

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

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