Clinical Electrocochleography

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Abstract
To establish a diagnosis of individual hearing disorders on the basis of electrocochleographic data, the characteristics of two clinically evident types of hearing loss arc determined. Action potential (AP) waveform is evaluated in cases of conductive hearing loss and high-frequency sensorineural hearing loss. Attention is given to action potentials of myogenic origin. The AP input-output curves for the two types of hearing disorders are given, and the difference between the ECoG threshold and the psycho-acoustic threshold is evaluated. Amplitude-latency and width-latency relations for the AP in conductive and high-frequency sensorineural hearing loss are determined and compared with those found in normal hearing. The compound AP threshold values, the slope of the input-output curves, the amplitude-latency relations, and the latency at the threshold appeared to be reliable diagnostic criteria.

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