Impedance Check Button; Test Procedure And Instruction Of Patient; Insertion Of Foam Ear Tips - Interacoustics Eclipse Additional Information

Eclipse Additional Information

5.7.4 Impedance check button

IMP button
1. After having attached the electrodes to the patient, it is crucial to check if the skin impedance is accepta-
ble. For best results, impedance at each electrode site should be as low as possible; preferably 10kΩ or
less and best if they are balanced.
2. To check the electrode impedances, press down the IMP button on the Preamplifier. When activated the
IMP button starts to flash.
3. Turn the dial fully clockwise and then turn it slowly counter clockwise. Each LED will turn from Red to
Green when the impedance is found for that specific electrode. The impedance value can be read on the
Preamplifier. Low and balanced electrode impedances are typically more efficient in reducing interfer-
ence.
4. If the impedance of one or more electrodes is too high, consider rechecking the bond between the skin
and electrode. If this does not help you may need to remove the electrode and repeat the skin preparation
procedure using a new electrode.
5. Return to recording mode by pressing down the IMP button again. All Preamplifier LEDs turn off.

5.7.5 Test procedure and Instruction of Patient

The cVEMP is recorded with contracted SCM muscles. Therefore the patient should be instructed in ways to
contract the SCM muscle throughout the recording. One way is by turning their head during the recording
and holding this position until instructed to relax again.
 The Patient is sitting upright in a chair or laying in a bed.
 The stimulus begins when the patient turns his/her head to the opposite shoulder (as shown below) until
the SCM muscle contraction places the EMG readings inside the EMG monitoring window's lower and
upper limits (target range).
 Position must be held during the VEMP recording.

Use the patient monitor to ensure a more accurate measurement.
Make sure that the patient understands the test procedure prior to staring the test.
A correct contraction of the SCM muscle is essential for a good cVEMP recording. The patient monitor pro-
vides information to the patient during testing to ensure a correct head turn and informs the patient about the
test time and contraction oFf the SCM muscle. The information provided on the patient monitor is a guide to
the patient and constitutes to a more accurate test procedure which may shorten the overall test time.
NOTE The patient must turn only his/her head without turning his/her body and shoulders. The shoulders
must be maintained in the same position as when sitting in a normal upright position. This is very important
because a body twist may lead to poor SCM muscle contraction/stretching and can therefore result in poor
cVEMP recordings.

5.7.6 Insertion of foam ear tips

1. Make sure that the end of the black tube is not covered by the yellow foam when you roll the foam tip into
the smallest diameter possible.
2. Insert the tip well into the ear canal. The correct insertion depth into the ear canal is obtained when the
rear edge of the tip is 2-3mm inside the entrance of the ear canal.
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