title: Evaluation of patients for cochlear implant by promontory stimulation. Psychophysical responses and electrically evoked brainstem potentials.
abstract: The protocol for assessing patients for cochlear implantation at University College Hospital and the Royal National Institute for the Deaf, London, includes a session of electrophysiological tests and electrical stimulation of the cochlea. Electrocochleography is performed with the object of excluding non-organic hearing loss and of clarifying the site of deafness. Using the same transtympanic needle, AC and DC electrical stimulation is performed to establish whether patients perceive a sensation of sound, dynamic range and ability to detect frequency shifts. Tinnitus suppression was produced by AC and DC stimulation. It is likely that AC suppression of tinnitus occurs by a masking effect. Electrically evoked auditory brainstem potentials were recorded in one patient.
mesh_terms: D001933:Brain Stem / Q000503:physiopathology*; D003054:Cochlear Implants; D004558:Electric Stimulation; D005073:Evoked Potentials, Somatosensory; D034381:Hearing Loss / Q000503:physiopathology / Q000601:surgery; D006320:Hearing Tests; D006801:Humans; D014012:Tinnitus / Q000503:physiopathology