User guide
ELI
O
S
ECH001XN111-A4 – 07/2022
46
Handheld mode measurement
4.2 ABR
The impedance values must be as small and well bal-
anced as possible to guarantee measurement quality.
As soon as the impedances are correct, if the checkbox “
Automatic rejection
” is not selected, the rejection must be
calibrated. This is an essential stage which must be carried out with the greatest care possible. The purpose is to define
the average muscular activity level of the patient at rest. Click on "
Rejection
" to open the configuration window for this
parameter.
The time signal appears on the screen. The indicator
light at the top left indicates whether the signal has
reached the rejection threshold (
◼
= threshold reached,
◼
= signal below threshold). The rejection level is de-
termined in %. The higher this percentage is, the more
the rejection is permissive. The dark area in the middle
of graph indicates the zone where the device does not
trigger rejection. It can be adjusted manually with the
+/- controller or automatically by clicking on "
Auto
".
Click on the "
Save
" button to save the value and return to the
ABR
parameter setting up menu.
Click on the "
Start
" button to start the measurement.
4.2.1.2
Measurement
The
ABR
measurement window opens, click on
"
Start
". If both ears are selected, the test start on the left
ear. the patient hears the sound.
If value
V-
is greater than 7kΩ, wipe the patient’s forehead again and reattach new electrodes.
If value
V+
is greater than
7kΩ, check that the mastoid electrode is properly placed. If necessary, wipe the
patient’s mastoid again and reattach new electrodes.
If the
V+
and
V-
values are greater than 7kΩ, check that the clips and electrophysiology cable are properly con-
nected. If these 2 values are less than 10kΩ but are balanced (deviation < ±2k
), measurement is possible.
It is possible to use for the automatic rejection, in this case the device will automatically adjust the rejec-
tion throughout the measurement.
The patient must be as relaxed as possible during this stage.
The rejection level must be set so that the
◼
indicator light is activated when the patient blinks his eyes or
swallows. At rest, it should not be activated more than one or 2 times per second.
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