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Abstract
OBJECTIVE: To assess the multifrequency tympanometry (MFT) in Menière’s disease (MD). METHODS: MFT was performed in 20 adult patients having definitive MD,
and 20 well-matched controls. Measurements included: Tympanograms for admittance (Y), conductance (G), susceptance (B) and phase angle (∅) at different probe frequencies and
resonant frequency (RF). Y, B, and G tympanograms were done at R.F and at 2000 Hz.
Amplitude, tympanometric width (TW), peak pressure value, and +200 daPa value of G at 2000 Hz were determined. RESULTS: The RF of affected ears of MD (group IA) (607.50 Hz ± 217.20) is lower than that of the non-affected ears MD (group IB) (642.50 Hz ± 216.60),
which in turn is lower than the controls’ ears (group II) RF (725.00 Hz ± 219.15) however, this difference was not statistically significant (p < 0.05). There was a statistically significant difference among the 3 groups as regards +200 daPa value There was no statistically significant difference among the 3 groups as regards the ∆ ∅, or the amplitude or peak pressure value of G at 2000 Hz. The mean TW of group IA was 155.5 daPa ± 104.69 and is higher than that of group IB (132.25 daPa ± 80.91). Both groups show higher means than that
of group II (88 daPa ± 31.89). This difference was statistically significant. This suggests that
MD results in modification of G tympanograms at 2 KHz, and there may also be sub-clinical affection of the asymptomatic ears of MD. There was no correlation between quantitative
tympanogram criteria and duration of MD or pure tone thresholds except for a statistically significant direct correlation between RF and age and hearing level at 250, 1000 and 4000 Hz.
CONCLUSION: MFT specially the measurement of RF of the middle ear and measurement of the TW of G tympanogram at 2 kHz has a role in the assessment of MD and its possible sub-clinical bilaterality.