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KMID : 0858620080120010016
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Korean Journal of Audiology
2008 Volume.12 No. 1 p.16 ~ p.21
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Correlation beween Electrically Evoked Compound Action Potential and Comfortable and Thresphold Levels as a Function of the Electrode Location and Duration after Cochlear Implantation
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Lee Bo-Bae
Kin Hyung-Jong
Lee Jung-Hak
Kim Jin-Sook
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Abstract
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Background and Objectives: At initial post-implantation, a correlation between objective and psychoacoustic data has not yet been sufficiently investigated due to high inter-individual variability in cochlear implant users. The goal of this study was to estimate correlation between the objective (intra-operation) and psychoacoustic (post-operation) data as a function
of the electrode location and duration after implantation.
Subjects and Methods: 15 adults and children Nucleus Freedom® cochlear implantees participated in this study. Intraoperative electrically evoked compound action potential (ECAP) of three -apical, medial, basal-electrode locations were compared with the‘threshold (T)’ and‘comfort (C)’ levels. Each electrode was measured at 4, 5, 7 and 11 weeks post-operatively.
Results: ECAP and C level get very similar after 7 weeks. The significant correlation was observed at medial location from
5 to 11 weeks with C level and at apical location from 4 to 11 weeks with C and T levels, respectively. Among three electrodes, basal electrode location did not show any correlation except only from 5 weeks with C, T levels. ECAP and C level get very similar after 7 weeks.
Conclusions: The intra-operative ECAP data may be used to predict C, T levels in cochlear implant users. This preliminary study suggests that ECAP may be utilized to predict C, T level at about 5 weeks of post-implantation. Further, speech performance ability should be added for the criteria for expecting C and T level as well as the behavioral measurements.
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KEYWORD
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Cochlear implant, Electrically evoked compound action potential, Neural response telemetry, Threshold level, Comfortable level
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