Operation Manual MA 33
8100092 Rev. 9
47
19/08/2019
Training of the Patient
Only with careful training during the following conditioning phase, can a valid test result
be achieved.
Press the start button or
S
key to start the SISI-test.
The intensity starts automatically 20 dB above measured threshold and can either be
adjusted by clicking the ↑↓ arrows in the SISI box on the screen or the ↑↓ cursor keys.
For training purposes, the intensity increases by 5 dB every 5 seconds. For example,
60 dB HL to 65 dB HL .
Increment presentation is identified when the grey dot lights up and turns yellow on the
screen (i.e. when tone is presented, the
Given
dot lights up).
The dot indicates the time frame, within which the patient is allowed to respond to the
increment (about 1.5 seconds). Any response that falls outside this time frame will not be
registered, so as to exclude false responses.
When the patient presses the patient response switch and thereby identifies that he/she
has registered the tone, the
Identified
dot lights up and turns green.
The number of detected (
Identified
) increments is counted and shown on the display.
Furthermore, the number of presented (
Given
) increments is also shown.
When the patient has understood the procedure of the test, reduce the level to increase
the increments to 3 dB, and subsequently to 2 dB, for further training and familiarization.
Performing the SISI-Test
Increase the intensity to 1 dB.
If the patient is responding correctly, start the SISI test with
increments of 1 dB by clicking the
Start
button. The following 20
signals will be presented with incremental intensity and the examiner
can track the progress on test screen. The intensity increase can be
prolonged by pressing the
Spacebar
.
Once twenty increments have been presented, the test stops
automatically and the result will be displayed on the screen (Figure 55).
The percentage of correctly-identified increments, together with the
total number of presented increments will be presented on the screen.
If the test result has reached a satisfactory level before twenty increments have been
presented, the test can be terminated by pressing the
Stop
button.
The SISI test can be ended and the result saved after ten increments have been
presented, by clicking the
Exit
button. The result will be shown automatically in the SISI
table in the measuring screen. The total incremental ratio of SISI test is expressed as a
percentage value. A 25 % value indicates neural (auditory nerve) impairment, and
sensory (inner ear) hearing impairment is indicated by a value greater than 70 %.
Figure 55
