title: A comparison of intra- versus post-operatively acquired electrically evoked compound action potentials.
abstract: The objective of this study was to compare the electrically evoked compound action potentials, intra- versus post-operatively, in cochlear implant patients. In a prospective study twenty-five consecutively implanted adult patients received a multichannel cochlear implant. In all patients, electrically evoked compound action potentials were recorded immediately after cochlear implantation and in a post-operative setting nine months later. The threshold of the electrically evoked compound action potential was determined in both settings. A high success rate (97.4%) was found in the intra-operative setting when recording the electrically evoked compound action potential threshold per patient. The success rate per patient was significantly lower (53.4%) in the post-operative setting. Correlations between the intra- versus the post-operative ECAP thresholds were statistically significant for all electrodes tested. The ECAP thresholds were not significantly different for the two settings. The intra-operative setting is preferable for acquisition of the ECAP threshold.
authors.affiliation: Department of Otorhinolaryngology, University Medical Center Utrecht, The Netherlands. gijs@vanwermeskerken.com
authors.forename: G K A
authors.initials: GK
authors.lastname: van Wermeskerken
authors.forename: A F
authors.initials: AF
authors.lastname: van Olphen
authors.forename: G A
authors.initials: GA
authors.lastname: van Zanten
mesh_terms: D000200:Action Potentials / Q000502:physiology*; D000328:Adult; D000368:Aged; D001309:Auditory Threshold; D019929:Cochlear Implantation; D003054:Cochlear Implants / Q000592:standards*; D004558:Electric Stimulation; D005260:Female; D006319:Hearing Loss, Sensorineural / Q000503:physiopathology* / Q000601:surgery*; D006801:Humans; D007432:Intraoperative Period; D008297:Male; D008875:Middle Aged; D016343:Monitoring, Intraoperative; D011184:Postoperative Period; D011446:Prospective Studies; D016896:Treatment Outcome