Monitoring the electrically evoked compound action potential by means of a new telemetry system
AuthorBrown, M.; Carter, P. M.; Fisher, A. R.; Nygard, T. M.; Swanson, B. A.; Shepherd, R. K.; Tykocinski, M.
Source TitleAnnals of Otology, Rhinology & Laryngology
University of Melbourne Author/sShepherd, Robert
Document TypeJournal Article
CitationsCarter, P. M., Fisher, A. R., Nygard, T. M., Swanson, B. A., Shepherd, R. K., Tykocinski, M., et al. (1995). Monitoring the electrically evoked compound action potential by means of a new telemetry system. Annals of Otology, Rhinology & Laryngology, 104(suppl.166), 48-51.
Access StatusOpen Access
This is a publisher’s version of an article published in Annals of Otology, Rhinology & Laryngology published by Annals Publishing Company. This version is reproduced with permission from Annals Publishing Company. http://www.annals.com/
It has been shown that behavioral thresholds in cochlear implant patients are well correlated to the electrically evoked auditory brain stem response (EABR).1 It is likely, therefore, that the electrically evoked compound action potential (ECAP), which is closely related to the EABR, will also show a similar correlation with behavioral threshold. Automatic measurement of a patient's ECAP would allow the patient's behavioral threshold level to be set automatically without any conscious input from him or her. It would offer the opportunity to greatly expedite the process of threshold setting and would be particularly useful in the case of young children, whose behavioral threshold levels can be difficult to judge. With this end in mind, an experimental system has been designed that allows the ECAP to be recorded with either scala tympani or extracochlear electrodes. The system, which uses a modified version of a standard cochlear implant, applies a biphasic stimulation pulse and records the ECAP a short time later. The recorded signal is transmitted by telemetry through the implant receiver coil to an external transmitter-receiver coil and is recovered and stored on computer. With the appropriate software it is then a relatively simple matter to determine the details of an evoked response. This paper presents the results of trials of the system on a guinea pig. The experiments were designed to evaluate the parameters to be used to obtain the clearest ECAP signal, with particular regard to the variables stimulating electrode position, stimulating electrode mode (bipolar or monopolar), sensing electrode position, sensing electrode mode, stimulation rate, and artifact cancellation scheme.
Keywordstelemetry system; Cochlear Pty. Limited; University of Melbourne; cochlear implant; auditory brain stem response; scala tympani; extracochlear electrodes; guinea pig
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