otometrics Madsen Xeta, Reference Manual

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After each increase, present the tone no more than twice. The tone is considered heard if the patient responds at
least once.
If the tone is heard when the masking level has been increased with at least three 5 dB steps, the so called masking
plateau has been reached and the test tone level is considered the masked hearing threshold level.
6. If the tone is not heard when the masking level is increased, increase the test tone level until the tone is heard by the
patient.
Repeat from step 5 .
7. If the test tone level at the masking plateau (established in step 5 ) is within 5 dB from the unmasked threshold level,
you can skip step 8 .
8. Keep the established masking level and confirm the masked hearing threshold level. To do so:
Decrease the test tone level by 10 dB and increase in 5 dB steps.
The patient should respond within 5 dB from the previously determined masked threshold level.
If not, repeat from 3 .
9. If needed, test the remaining frequencies in the same way and switch to the other ear.
7.6 SISI (Short Increment Sensitivity Index)
Note
• This test is optional.
The SISI Test was developed by Jerger and co-workers (Jerger, Shedd, and Harford, 1959) and was introduced as a pro-
cedure that was reliable and reasonably objective.
The test consists of superimposing brief bursts of 1 dB intensity increments on a sustained tone presented monaurally
through earphones at a sensation level of 20 dB at each tested frequency.
The patient is instructed to report any jumps in loudness detected while listening to the sustained tone for a period of
about two minutes.
Selecting the test
1. Press More one or more times until SISI appears, and select the test by
pressing SISI once.
The top line shows the intensity (dB HL) to which the increments have
been added, the test name, and the current SISI % score.
The bottom line shows the number of dB increments currently trans-
mitted, the test tone frequency and the scale of the SISI dB increments.
2. To start the SISI test press
Start/Pause
.
The test stops automatically when the selected number of steps in
intensity has been reached, and a beep is heard.
Automatic scoring of responses
• The percentage of correct responses (% score) is updated automatically.
74 Otometrics - MADSEN Xeta
7 Testing a patient with MADSEN Xeta