Electrode impedance changes over time in MED El cochlear implant children recipients: Relation to stimulation levels and behavioral measures |
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Authors: | Eman Asaad Fayed Hesham Saad Zaghloul |
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Institution: | 1. Mansoura General Hospital, Mansoura, Egypt;2. Faculty of Medicine – Mansoura University, Mansoura, Egypt |
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Abstract: | Objective: Electrode impedance measures resistance encountered by electric current passing through wires, electrodes and biological tissue. This study was designed mainly to evaluate changes in electrode impedance values and psycho-electric parameters changes (i.e. threshold levels, comfortable levels, and dynamic range) in cochlear implant patients over time. Methods: It was a prospective study encompassing 20 patients implanted by MED-EL device programd using behavioral programs. Electrical stimulation levels and electrode impedance values were examined at 0, 1, 3 and 6 months after the first fitting session. Results: Electrode impedance values were reduced from the time of activation to the 6 months visit. Most comfortable levels increased and dynamic range widened until the 6 months visit. There was an inverse correlation between impedance values and most comfortable level as well as dynamic range, over time. Conclusion: Frequent monitoring of electrode impedance (for device and electrodes problems) and electric stimulation levels (for better performance, mapping and habituation) during the first 6 months of implant use is recommended. |
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Keywords: | Cochlear implant Electrode impedance Most comfortable level Dynamic range |
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