Transcript
This is how you perform a SISI test on the AD528.
Press and hold the test button and select the SISI test.
Select 'tone' or 'warble' on Channel one.
If cross hearing is present, activate masking on Channel two.
Select a desired test frequency and set the input level 20 dB above threshold using the scroll wheel on the audiometer.
In the most common type of SISI test, the increment steps are set to 1 dB.
You can change the increments by pressing and holding the function button ‘AM’.
Prior to presenting the actual test of 1 dB increments, a trial of two or five-dB steps can be employed to ensure that the patient understands the test procedure and what will be required.
If you are uncertain about the responses from the patient, 0 dB can be used.
Explain to the patient that they will now hear a series of tones.
When they hear a sudden change in loudness of the presented tone, they should push the response button.
Start the test by pressing ‘Start’.
The system will automatically count the number of presentations and reactions from the patient.
Note that the system needs 20 presentations to calculate a SISI score.
Repeat the test for all desired test frequencies.
Save the SISI test by clicking ‘Save session’.
If the patient does not achieve a high score on the SISI test, this may indicate retrocochlear damage.
