Eclipse Additional Information Page 65
Neonates generally do not require excessive abrasion. Neonates Alcohol prep pads may be used to prepare
the electrode site. Observe and comply with any local protocol that may limit the agents and techniques used
in preparing electrode sites in neonates.
3.9.4 Placement of Electrodes
Mounting the electrode depends of the type of electrode used. Disposable electrodes are already pre-
gelled, no further gel is needed. Mount the disposable electrode by securing it to the position by firmly press-
ing the fingertip along the white border around the edge of the electrode pad.
Do not press in the middle of the disposable electrodes when mounting, since this will cause gel to be
pressed out and the adhesive below the white border line will not stick. This will cause the electrode to
loosen from the skin and may cause very high impedances during testing.
For the reusable electrodes apply some conductive electrode gel on all reusable electrodes and mount.
You can use the conductive gel for the reusable electrodes cups after the preparation. Tape can be used to
secure the reusable electrodes in place on the skin. A good tape to use is hospital tape which is a gaze-like
with a good glue/sticky surface. If you carefully pull on the electrode some seconds after application, the
electrode should remain tightly adhered to the skin.
Note Mounting the electrodes correctly is crucial for a good measurement. When mounted correctly it should
be possible to achieve impedance in the range 0.5-1kOhm.
Place an electrode on each mastoid or earlobe (blue electrode lead on left side, red on right side) one at the
vertex or hair-line (white electrode lead) and the ground connection (black) can be placed on the low fore-
head or side of the forehead. The placement of the ground electrode is not very critical, though in general it
should not be placed within about 3cm of any other electrode. It is a good idea to attach the cable and the
electrodes before placing them on the head to avoid unnecessary pressure on the electrodes while they are
place on the patient.
Note, that all four/three electrodes should be positioned (EPA4/EPA3). In other words all electrode sockets
must be occupied.
The disposable electrodes supplied with the unit are single use types, which are already prepared with elec-
trically conductive paste. No additional electrode gel/paste is needed.
Note Positioning of the white electrode at the true vertex will provide ABR and cortical response waveforms
with higher wave amplitudes.
If the hair-line montage is used, move the electrode as close to the hair-line as possible for best results. In
general the lower the active electrode is positioned the smaller the response.
Generally the system can be used to record any potentials generated by muscles, nerves etc. (including re-
search on animals). However, pay attention to the amplitude and rate of the signal to record.
Place an electrode on each mastoid (or earlobe), one at vertex (or hair-line) and one on the cheek or low
forehead. Connect all four electrode leads.
After having attached the electrodes to the patient, it is crucial to check if the skin impedance is acceptable.
For best results, impedance at each electrode site should be as low as possible; preferably 3kΩ or less and
best if they are balanced.
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