Special Tests; The Sisi Test - otometrics Madsen Midimate 602 Quick Manual

MIDIMATE 602 & 622 Diagnostic Audiometers

6 Special Tests

To go to the Select special Test menu, press Menu until the Select Func-
tion menu is displayed and then press Softkey 3, Special.
6.1

The SISI test

The SISI test (Short Increment Sensitivity Index) shows whether a patient can detect
small variations in intensity lasting 200 ms. The SISI test is not a recruitment test. A
patient who scores 60% or better for frequencies above 1000 Hz or in some cases
down to 250 Hz may have cochlear problems. Patients with normal hearing, middle
ear diseases or nerve hearing loss will score up to 20% at all frequencies.
To make the SISI test, do as follows:
1. Connect the patient response handswitch, the headphones, the optional monitor
headset (or the optional monitor adaptor with talkover microphone and monitor
loudspeaker), and the optional patient talkback microphone.
2. Switch on the electric power supply.
3. Place the patient, facing away from the MIDIMATE 602/622, in a sound-cabin, if
available.
4. Press Menu once or twice to display the Select Function menu.
5. Press Softkey 3, Special.
6. Select SISI (A) L from the Select special Test menu by pressing Soft-
key 1.
7. Select Left by pressing Softkey 1 or Right by pressing Softkey 2.
8. Instruct the patient to activate the patient response handswitch every time a short
increment in level is heard.
9. To demonstrate the test to the patient, turn the Hearing Level wheel until the
stimulus tone (shown above Softkey 3) is 40 dB or more.
10. If the display does not show 1-5dB, (the 5 dB default increment), toggle Softkey
2 until it does.
11. Press the Tone Switch to begin the demonstration.
12. Make sure that the patient has understood the instructions: the Response indi-
cator lights up when the increments in stimulus tone are displayed above Soft-
key 3. The increments are not audible in the monitor headset.
13. Stop the demonstration by turning the Hearing Level or Frequency wheel.
14. Reduce the stimulus tone to 20 dB.
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