Exam Preview

Introduction to Telemetry and Neural Response Telemetry (NRT) in the Nucleus Cochlear Implant System

---

1.  What is electrode impedance actually measuring? The amount of current needed to produce an auditory sensation The resistance to electrical stimulation through the electrodes in the Nucleus device The electrically-evoked compound action potential (ECAP) The auditory response of the neural elements

2.  What modes of stimulation are used for impedance measurements in Custom Sound? Bipolar, Monopolar and Tripolar Pseudomonopolar, Common Ground and Monopolar Common Ground, Monopolar 1, Monopolar 2 and Monopolar 1+2 Common Ground only

3.  Neural Response Telemetry (NRT) is generated by: Specific neural populations Hair cells in the cochlea The auditory cortex The stapedial reflex

4.  Presence of an NRT threshold tells you: The auditory nerve is able to fire synchronously in response to electrical stimulation An estimation of behavioral T and C levels The stability of the auditory nerve response if measured at various points in time All of the above

5.  In the operating room, if NRT responses are absent but impedances are present this can mean: The implant device is not working The patient may need a wider pulse width for auditory stimulation than can be measured with NRT This type of electrode is not appropriate for the patient The patient will not be able to hear with the device

6.  What can cause an open circuit? Two electrode wires touching each other An electrode that is next to the facial nerve Bipolar stimulation A broken electrode or one not in contact with fluid

7.  AutoNRT was first introduced in which of the following devices? Original Nucleus 24 device Profile (CI512) device Freedom (CI24RE) device Nucleus 22 device

8.  If EC2 is showing as "open" in the operating room, what can you tell the surgeon? Re-position the ball electrode Moisten the flap and place it back down over the receiver and plate electrode Go to the backup device None of the electrodes are in the cochlea

9.  In Custom Sound software, NRT levels are shown by: Green marks in the set levels screen Red marks in the set levels screen Blue marks in the set levels screen They cannot be shown in Custom Sound

10.  Which of the following are uses of NRT when mapping a patient? NRT can help you estimate where T and C levels might be, especially in patients who cannot provide good behavioral responses NRT can provide the "profile" of the T and C levels for a patient NRT can confirm there is a response of the auditory nerve to electrical stimulation All of the above