Pathogenesis of the Broad Waveform in Electrocochleograms
The widened AP-SP complex is one of the characteristic features of electrocochleograms (ECochGs) in patients with Ménière’s disease. This broad waveform has also been noted in other cases of endolymphatic hydrops, such as hydrops without vertigo, luetic hydrops, etc . Hence, the broadening in the waveform of ECochGs seems to be of great value for the objective differential diagnosis of endolymphatic hydrops. However, a similar waveform is often observed in cases of retrocochlear lesions, such as cerebellopontine (CP) angle tumors and kernicterus [2, 3]. Since endolymphatic hydrops is not thought to be involved in these diseases, the diagnostic value of ECochG is thereby limited.
KeywordsHair Cell Outer Hair Cell Benign Paroxysmal Positional Vertigo Vestibular Nerve Endolymphatic Hydrops
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