DIAGNOSTIC-SIGNIFICANCE OF ELECTROCOCHLEOGRAM AND AUDITORY-EVOKED BRAIN-STEM RESPONSE IN TOTALLY OR SUBTOTALLY DEAF PATIENTS

This paper examined the use of ECoG and ABR in 7 patients with totally or subtotally deaf ears. The patients included one with cortical deaf ness, one with psychogenic deafness, one with intrapontine hemorrhage, and 4 with acoustic neuroma. In patients with substantial hearing los s, ECoG should be performed first if retrocochlear disorders are suspe cted since results may be obtained even in the absence of other audito ry evoked potentials. Simultaneous ABR measurements can be effective w hen localizing retrocochlear lesions. ECoG can also help to determine the need for preserving hearing during surgery for retrocochlear lesio ns by indicating the degree of cochlear function.