Reflex Decay - Interacoustics AA222 Additional Information

AA222 Additional Information

2.4 Reflex decay

Note that in cases where your protocol has no reflex decay test included, you can temporarily include a reflex
decay test in 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 case:
•
the reflex threshold cannot be found within the same protocol
•
the required intensity is at or above the warning level as determined in the protocol settings
•
the required intensity is above the maximum level that the transducer will permit for this particular
activator
The default display of the reflex decay tests shows the graphs of the decay measurements from the selected
ear. The following information is found in the display:
A The tympanometric 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 can 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 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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