Performing A Cvemp Measurement - Interacoustics Eclipse Additional Information

Eclipse Additional Information
3. Hold the foam tip in the ear canal until the foam expands. This takes a few seconds.
Use a new pair of ear tips for the next patient.
5.8

Performing a cVEMP measurement

1. Choose one of the cVEMP Protocols
2. Select test side (The picture shows the right saccule being tested).
3. Choose intensity – starting intensity is normally ≥ 95dB nHL.
4. Instruct the patient to turn their head to the right or left to activate the SCM muscle on the test ear.
5. Press the start button while the patient is contracting the SCM muscle.
The cVEMP recordings should show reproducible components around 13 and 23ms (P1 and N1), as
seen in a healthy subject. If no cVEMP responses can be obtained, it does not necessarily mean a patho-
logic result.
Typically 100-200 sweeps are averaged per waveform. If no cVEMP waveforms are detectable, try to use
a higher intensity and verify normal middle ear function. Also confirm the correct electrode placement has
been used and that the patient has followed the test instructions correctly. cVEMPs are normally recorded
at a high intensity level and may also be recorded down to threshold.
6. To mark a waveform make sure that you have selected the waveform you would like to mark. Right click
or the curve, and then choose the correct marker. Drag your mouse to the correct area and click. You can
also choose 1-4 on the keyboard to bring up the appropriate marker and use Enter to place it.
7. EMG Scaling: The default protocol is setup to scale the curves automatically. Some prefer to scale after
the recordings are completed. After the recording is complete, you can right click on the waveform and
choose EMG Scaling.
8. Set VEMP partner: After collection, choose a left or right ear by double clicking the waveform handle.
Next, right click the waveform handle of the opposite ear and select Set as VEMP Partner. These se-
lected waveforms will be used in the Asymmetry Ratio Calculation.
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