CHAPTER TEN
ABR test
86
ABR test procedure
If the test still does not start automatically, observe the two noise bars TN
(EEG Noise), and PN (Powerline Noise). They may be high. For advice on
how to reduce the noise see section
6.2
ABR test problems
.
The test will start automatically when conditions are good.
If you are unable to improve test conditions then you may manually begin
the test by selecting
Start
.
If test conditions are poor
If impedance or noise conditions are poor then the test will not start and
it will not be possible to start a test manually. A message on the screen
will show the problem. It will tell you if EEG Noise, Powerline Noise or
Impedance are preventing the test from starting. Try to resolve the issue
so that testing can start.
• If any electrode impedance is marked with X then refit that electrode
• If High EEG Noise is shown then try to settle the baby.
• If High Powerline Noise is shown and electrode impedances are good,
then see if there is any electrical equipment in the room that can be
turned off.
(See section
6.2
ABR test problems
for more detail).
Select
Back
to cancel the test.
If required, further advice on electrical noise indicators and impedance
assessment levels is provided on the next two pages.