Madsen zodiac, Reference Manual

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C. Tympanometry results
The results table shows the results related to the currently selected curve:
• Probe (the probe tone in Hz)
•
TPP offset
(Tympanometric Peak Pressure)
• ECV (Equivalent Ear Canal Volume)
•
SA
(Static Peak Admittance), or
SC
(Static Peak Compliance) when volume equivalent units are used
• TW/Ratio (Tympanometric Width/Tympanometric Ratio). Describes the steepness of the curve.
•
Type
(Jerger types A, As, Ad, B, C, D and E denote the shape of the 226 Hz curve). You can set the type to be
determined automatically, and you can subsequently change it manually, if necessary.
D. On-screen selections
Curve selection Press the Previous Curve or Next Curve softbutton to select the desired curve in
the Reflex Screening and Tympanometry result tables.
Changing tympanogram curve type Press the Change Type button until the desired tympanogram type is shown.
Deleting a curve Select the curve you wish to delete, and press the Delete button.
To replace a single measurement, delete a curve and adjust the measurement
selections to redo the single measurement.
9.9 Admittance (Y) Recorder
Admittance (Y) Recorder is a functionality where you can record the admittance either without stimulus or with any
external stimulus. The functionality can be useful both for investigative purposes and troubleshooting in conjunction with
unstable acoustic reflex traces.
Admittance (Y) Recorder is useful for several purposes such as:
• Reflex testing of the stapedius muscle
– external electrical stimulation with cochlear implants
– tactile stimulation
• Patulous Eustachian tube testing
Admittance variations in synchrony with the patient's breathing cycle resulting from insufficient closing of the Eus-
tachian tube
• Vascular artefacts
Admittance variations in synchrony with the patient's pulse. This phenomenon can be observed in some cases
involving superficial blood vessels that influence the probe or the tympanic membrane. The condition is sometimes
observed as a pulsatile objective tinnitus. It may indicate the presence of a Glomus tumor.
Physiological conditions
• Variations that are in synchrony with the patient's pulse:
In some patients, superficial blood vessels may influence the measurement. Try to place the probe at a different depth
68 Otometrics - MADSEN Zodiac
9 Testing with Zodiac Diagnostic or Clinical - Stand-Alone