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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.
| Acronyms | ||
| ECAP | = | Electrically evoked compound action potential |
| NRT | = | Neural response telemetry |
| T levels | = | Threshold hearing levels |
| C levels | = | Comfort hearing levels |
| SPEAK | = | Spectral peak speech coding strategy |
| ACE | = | Advanced combination encoder speech coding strategy |
| MP1 | = | Monopolar stimulation mode |
| CL | = | Current level |
| AGF | = | Amplitude growth function |
| Acronyms | ||
| ECAP | = | Electrically evoked compound action potential |
| NRT | = | Neural response telemetry |
| T levels | = | Threshold hearing levels |
| C levels | = | Comfort hearing levels |
| SPEAK | = | Spectral peak speech coding strategy |
| ACE | = | Advanced combination encoder speech coding strategy |
| MP1 | = | Monopolar stimulation mode |
| CL | = | Current level |
| AGF | = | Amplitude growth function |
Sumario
El objetivo de este estudio fue comparar intra y post-operatoriamente los potenciales compuestos de acción evocados eléctricamente, en pacientes con implante coclear. En un estudio prospectivo, veinticinco pacientes adultos implantados en forma consecutiva, recibieron implantes cocleares multi-canal. En todos los pacientes se registraron los potenciales compuestos de acción eléctricamente evocados, inmediatamente después de la implantación coclear y en un contexto post-operatorio nueve meses después. Se determinó el umbral de los potenciales compuestos de acción evocados eléctricamente para ambas condiciones. Se encontró una alta tasa de éxito (97.4%) en el contexto intra-operatorio, cuando se registraron esos potenciales en cada paciente. La tasa de éxito por paciente fue significativamente más baja (53.4%) en el post-operatorio. Las correlaciones entre los umbrales de los ECAP intra-operatorios versus los post-operatorios fueron estadísticamente significativas para todos los electrodos evaluados. Los umbrales de los ECAP no fueron significativamente diferentes para las dos condiciones. El ambiente intra-operatorio fue preferible para la adquisición del umbral de los ECAP.