GE CARESCAPE, User Manual

Page: 387 / 548

EEG and auditory evoked potentials
Problem Solution
●
Check the number of channels.
The screen configuration may not include the EEG
parameter window.
●
Check the monitor setup.
Why are the numeric values replaced by ---? The patient has high muscle activity in the head area,
or noise from some interfering equipment is coupling
to electrode cables.
●
Relax the patient and remove the source of noise.
Why do the electrode impedances show --- and
there is a message prompting to check the ground
electrode? The ground electrode is poorly connected to the
patient, or its cable is not connected to the headbox.
●
Check the electrode and cable.
If the impedance of the electrode is too high, the
measurement fails even if the electrode is properly
attached.
●
Use better electrodes or prepare the skin better.
Why are there some baseline fluctuations? For instance, sweating may cause variations in the
electrode impedance.
●
In case the fluctuation is disturbing, prepare the
skin and replace the electrode.
Measuring auditory evoked potentials (AEP)
Preparing the patient for AEP measurement
1. Prepare the patient and electrodes as you would for EEG measurement.
2. Connect the leadset and electrodes.
3. Connect earphones to the headbox and place them on the patient's ear/s.
NOTE
Make sure that the earphones do not press the patient's
head in any position (for example, when the patient is
lying on one side).
NOTE
Use only GE Healthcare supplied headphones/earphones.
In other headphones/earphones the sensitivity may vary
causing too high an intensity, which may damage the ear,
or too low an intensity, which may cause a poor response.
2062971-001 CARESCAPE Modular Monitors 387