Abstract
A new procedure of evoking brainstem potentials shall be introduced. Contrary to evoking brainstem potentials by acoustic stimulation via earphone or loudspeaker we touch the middle ear apparatus at various locations using a special mechanical vibrating system thus evoking movements within the sound-conducting structures. As a reaction to this kind of stimulation far-field brainstem potentials can be recorded; the intraoperative control of sound transmission to the inner ear is ascertained by these potentials' latency and amplitude. In order to apply the above procedure in tympanoplasty we have made a number of recordings after having simulated various kinds of middle ear pathology in the guinea pig.
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