Eclipse Additional Information Page 116
5.7 Preparing for the cVEMP
5.7.1 Visual inspection of the ear canal
Check the external ear canal for wax with an otoscope and remove excessive wax to prevent the probe
opening from clogging which will inhibit testing.
Check if there might be middle ear issues, e.g. fluid or otosclerosis by performing tympanometry.
5.7.2 Preparation of the skin
Only apply the following procedure to patients for whom it is appropriate.
The electrode sites must be prepared and cleaned in order to obtain acceptably low skin impedance. A good
and thorough job of rubbing the skin with preparation gel may turn the skin a little red, but will ensure good
impedances. Some clinicians prefer to clean off the gel with an alcohol wipe. This will also ensure a very
clean area, well suited for the adhesive part of the electrode.
5.7.3 Electrode placement
The electrodes placed on the SCM muscles should be placed on the belly of the SCM muscle. The easiest
way to locate the site of placement is by asking the patient to turn their head, to cause a contraction of the
SCM muscle.
This montage allows both sides to be tested without rearranging electrode cables but will display the VEMP
curve “upside down”. The curve’s display polarity may be changed in the general setup.
Alternative Electrode Placement
This electrode montage is good for patients where it is difficult to mount the electrode between the clavicles,
and two of the electrodes can be reused if the patient has had an ABR test prior/post to the test.
A disadvantage of this montage is that the vertex electrode has to be moved to the opposite SCM muscle
during testing.
Note The EPA3 cable collector does not allow VEMP testing, as the reduced VEMP gain cannot be enabled
on the preamplifier.
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