60 Middle ear pathologies Welch Allyn MicroTymp3 portable tympanometric instrument
vibration with greater ease than the normally stiff tympanic membrane. The result is a
high Peak Ya. Although the tympanogram is abnormal, this condition rarely affects hearing
sensitivity or requires further medical treatment.
Ossicular disruption
Disruption of the ossicular chain can range from partial interruption to complete absence
of the ossicles. These conditions result from the erosive effects of chronic infection,
trauma, and congenital defect. Ossicular disruption is usually associated with a substantial
conductive hearing loss. Because the ossicles normally "load" the eardrum, contributing to
its tension, the eardrum in an ear with ossicular disruption can be more easily set into
vibration than the normal eardrum, resulting in high Peak Ya.
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