Changes of postoperative impedances in cochlear implant patients: The short-term effects of modified electrode surfaces and intracochlear corticosteroids

Otology and Neurotology

Volumn 27, Issue 5, 2006, Pages 639-647

  Paasche, Gerrit ^a   Bockel, Franziska ^a   Tasche, Claudia ^b   Lesinski Schiedat, Anke ^a   Lenarz, Thomas ^a  

^a HANNOVER MEDICAL SCHOOL   (Germany)

^b Research and Technology Labs   (Australia)

Author keywords

Cochlear implant; Contour electrode; Iridium coated contacts; Postoperative impedance; Steroids

Indexed keywords

CORTICOSTEROID; IRIDIUM; TRIAMCINOLONE; TRIAMHEXA;

ACOUSTIC IMPEDANCE; ADULT; ARTICLE; CLINICAL ARTICLE; COCHLEA PROSTHESIS; CONTROLLED STUDY; ELECTRODE; FEMALE; HEARING AID; HUMAN; INNER EAR MALFORMATION; MALE; PERCEPTION DEAFNESS; PREOPERATIVE EVALUATION; PRIORITY JOURNAL; STATISTICAL SIGNIFICANCE; TISSUE GROWTH;

ADRENAL CORTEX HORMONES; ADULT; AGED; COCHLEA; COCHLEAR IMPLANTS; DEAFNESS; ELECTRIC IMPEDANCE; ELECTRODES, IMPLANTED; FEMALE; HUMANS; INTRAOPERATIVE CARE; IRIDIUM; MALE; MIDDLE AGED; POSTOPERATIVE PERIOD; PROSTHESIS DESIGN; TOMOGRAPHY, X-RAY COMPUTED;

EID: 33746860405     PISSN: 15317129     EISSN: 15374505     Source Type: Journal    
DOI: 10.1097/01.mao.0000227662.88840.61     Document Type: Article

References (24)

1. Strauss-Schier A, Battmer RD, Rost U, Allum-Mecklenburg DJ, Lenarz T. Speech-tracking results for adults. Ann Otol Rhinol Laryngol 1995;166:S88-91.
2. Calmels MN, Saliba I, Wanna G, et al. Speech perception and speech intelligibility in children after cochlear implantation. Int J Pediatr Otorhinolaryngol 2004;68:347-51.
3. de Boer RW, van Oosterom A. Electrical properties of platinum electrodes: impedance measurements and time-domain analysis. Med Biol Eng Comput 1978;16:1-10.
4. Hyland M, Mailley S, Savanidis C, McLaughlin J, McAdams E: Thin film platinum and iridium oxide coatings applied to gold/flexible polymers for functional electrical stimulation electrodes. Proceedings of the 5th Annual Conference of the International Functional Electrical Stimulation Society, 2000.
5. Ruddy HA, Loeb GE. Influence of materials and geometry on fields produced by cochlear electrode arrays. Med Biol Eng Comput 1995;33:793-801.
6. Tykocinski M, Duan Y, Tabor B, Cowan RS. Chronic electrical stimulation of the auditory nerve using high surface area (HiQ) platinum electrodes. Hear Res 2001;159:53-68.
7. G Reuter, personal communication.
8. Peeters S, van Immerseel L, Zarowski A, Houben V, Govaerts P, Offeciers E. New developments in cochlear implants. Acta Oto-Rhino-Laryngologica Belgica 1998;52:115-27.
9. Blau A, Ziegler C, Heyer M, et al. Characterization and optimization of microelectrode arrays for in vivo nerve signal recording and stimulation. Biosens Bioelectron 1997;12:883-92.
10. Robblee LS, Rose TL. Electrochemical guidelines for selection of protocols and electrode materials for neural stimulation. In: Agnew WF, McCreery DB, eds. Neural Prosthesis. Englewood Cliffs, NJ: Prentice Hall, 1990:25-66.
11. Evans DE, Niparko JK, Miller JM, Jyung RW, Anderson DJ. Multiple-channel stimulation of the cochlear nucleus. Otolaryngol Head Neck Surg 1989;101:651-7.
12. Cogan SF, Guzelian AA, Agnew WF, Yuen TG, McCreery DB. Over-pulsing degrades activated iridium oxide films used for intracortical neural stimulation. J Neurosci Methods 2004;137:141-50.
13. Huang CQ, Shepherd RK. Reduction in excitability of the auditory nerve following electrical stimulation at high stimulus rates: V. Effects of electrode surface area. Hear Res 2000;146:57-71.
14. Saunders E, Cohen LT, Aschendorff A, et al. Threshold, comfortable level and impedance changes as a function of electrodemodiolar distance. Ear Hear 2002;23:28S-40S.
15. Xu J, Shepherd RK, Millard RE, Clark GM. Chronic electrical stimulation of the auditory nerve at high stimulus rates: a physiological and histopathological study. Hear Res 1997;105:1-29.
16. De Ceulaer G, Johnson S, Yperman M, et al. Long-term evaluation of the effect of intra-cochlear steroid deposition on electrode impedance in cochlear implant patients. Otol Neurotol 2003;24:769-74.
17. Swanson B, Seligman P, Carter P. Impedance measurement of the Nucleus 22-electrode array in patients. Ann Otol Rhinol Laryngol 1995;166:S141-4.
18. Busby PA, Plant KL, Whitford LA. Electrode impedance in adults and children using the Nucleus 24 cochlear implant system. Cochlear Implants Int 2002;3:87-103.
19. French ML. Electrical impedance measurements with the CI24M cochlear implant for a child with Mondini dysplasia. Br J Audiol 1999;33:61-6.
20. Schulman JH. Using impedance telemetry to diagnose cochlear electrode history, location, and functionality. Ann Otol Rhinol Laryngol 1995;166:S85-S7.
21. Dorman MF, Smith LM, Dankowski K, McCandless G, Parkin JL. Long-term measures of electrode impedance and auditory thresholds for the Ineraid cochlear implant. J Speech Hear Res 1992;35:1126-30.
22. Lenarz T, Lesinski-Schiedat A, Weber B, et al. Surgical aspects and preliminary results with the Nucleus 24 k and the Nucleus Contour Electrode. Proceedings of the 5th European Symposium on Paediatric Cochlear Implantation; Antwerp, Belgium; June 4-7, 2000.
23. Kawano A, Seldon HL, Clark GM, Ramsden RT, Raine CH. Intracochlear factors contributing to psychophysical percepts following cochlear implantation. Acta Otolaryngol 1998;118:313-26.
24. Paasche G, Lesinski-Schiedat A, Lenarz T. Steroid-induced reduction of impedance after cochlear implantation is maintained for several years. Ger Med Sci (in press).