The Use of Telemetry-Evoked Compound Action Potentials (TECAP) in Cochlear Implantation
For about 20 years, Cochlear Implants have successfully restored hearing in postlingual deaf or helped to acquire auditory communication in prelingual deaf patients. However, only in recent years Cochlear Implant manufacturers have implemented stimulating and recording protocols for evoked compound action potentials in order to assess auditory nerve function in relation to the implanted device. Along with the principles of stimulation and recording of TECAPs, two cases are presented which highlight their diagnostic value as well as their limitations. While the pooled data obtained from patients are yet too variable to serve as a predictor for individual stimulation strategies, TECAPs are highly useful in intraindividual follow-up of patients in whom Cochlear Implant stimulation currents may vary even after years and who require re-adjustment according to objectively registered neural responses.
KeywordsCochlear Implant Compound action potential Inner Ear Hearing Rehabilitation
Unable to display preview. Download preview PDF.
- 1.Moller AR (2006) History of cochlear implants and auditory brainstem implants. Adv Otorhinolaryngol 64:1–10Google Scholar
- 2.Geers AE (2006) Factors influencing spoken language outcomes in children following early cochlear implantation. Adv Otorhinolaryngol 64:50–65Google Scholar
- 8.El-Kashlan HK, Telian SA (2004) Cochlear implantation in the chronically diseased ear. Curr Opin Otolaryngol Head Neck Surg 12(5):384–6Google Scholar
- 11.Roland PS, Wright CG (2006) Surgical aspects of cochlear implantation: mechanisms of insertional trauma. Adv Otorhinolaryngol 64:11–30Google Scholar
- 14.Cafarelli Dees D, Dillier N, Lai WK, von Wallenberg E, van Dijk B, Akdas F, Aksit M, Batman C, Beynon A, Burdo S, Chanal JM, Collet L, Conway M, Coudert C, Craddock L, Cullington H, Deggouj N, Fraysse B, Grabel S, Kiefer J, Kiss JG, Lenarz T, Mair A, Maune S, Muller-Deile J, Piron JP, Razza S, Tasche C, Thai-Van H, Toth F, Truy E, Uziel A, Smoorenburg GF (2005) Normative findings of electrically evoked compound action potential measurements using the neural response telemetry of the Nucleus CI24M cochlear implant system. Audiol Neurootol 10(2):105–16CrossRefGoogle Scholar
- 15.Dillier N, Lai WK, Almqvist B, Frohne C, Muller-Deile J, Stecker M, von Wallenberg E (2002) Measurement of the electrically evoked compound action potential via a neural response telemetry system. Ann Otol Rhinol Laryngol 111(5 Pt 1):407–14Google Scholar