Reflex Decay Test Screen - Interacoustics AA222 Instructions For Use Manual

AA222 Instructions for Use – US

3.6.6 Reflex decay test screen

Note that in cases where your protocol has no reflex decay test included, you can temporarily include a reflex
decay test to your protocol by holding the Shift button while pressing the I Reflex C button. Pressing this
combination also allows including and excluding a reflex decay test from running automatically.
The decay test will be automatically performed with an activator intensity of 10 dB above the reflex threshold.
The test will show a pop up and ask for the intensity of the activator in cases where:
•
within the same protocol, the reflex threshold cannot be found
•
the required intensity is at or above the warning level as set up in the protocol settings
•
the required intensity is above the maximum intensity that the transducer allows to be played for this
particular activator.
The default display of the reflex decay tests shows the graphs of the decay measurements which are
measured on the selected ear. The following information is found in the display:
A The tympanometry curve
B Within the graph, the x-axis is the time scale on which the black bar indicates when the stimulus was
given.
C The table with measurement values which are only calculated if the measurement could be
completed.
•
Level, stimulus level
•
Pressure, the pressure at which the decay reflex is measured. Usually the Decay test will be
set up to use the peak pressure of a preceding tympanogram.
•
Stimulus, stimulus frequency
•
Decay Value, the decay value is the percentage difference of the two reflex deflection values
taken half a second after the stimulus started and half a second before the stimulus stopped.
If decay is present, the percentage shows as a negative number. When the calculation
results in numbers larger than 125% or smaller than -115% the outcome is invalid and will
not be shown.
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