Int. Adv. Otol. 2009; 5(3); 362-365

Alterations to electrode impedance values in response to electrode stimulation in the first mapping session of children using Clarion cochlear implant
Motasaddi Zarandy M,  P. Abbasalipour,  H. Borghei  H, MT Khorsandi,  F Moubedshahi 

Department of Cochlear Implantation, ENT Research Center, Amir Alam Hospital, Tehran University of Medical Sciences, Tehran, Iran, motesadi@sina.tums.ac.ir

Objective: Commencement of electrical stimulation in initial fitting session can decrease electrode impedance values in whole
electrode array of Clarion cochlear implant system. Previous studies showed that commencement of electrical stimulation in
Nucleus 24 cochlear implant system decreased in electrode impedance values.

Materials and Methods: For this purpose, 26 pre-lingually deaf patients (10 Clarion CII and 16 Clarion HiRes 90K users) were
studied. Electrode impedance changes before and after conditioning were determined with SoundWave software. Paired t-test
and one-way ANOVA were used for comparing the values between groups and among the impedance values within the
electrode numbers, respectively.

Results: Electrode impedance values did not show significant difference between before and after conditioning in CII Clarion
cochlear implant users. However, a significant difference was shown in electrode impedance values of HiRes 90K system
between before and after conditioning.

Conclusion: The results showed that commencement of electrical stimulation in initial fitting day resulted in decreasing of
electrode impedance values in whole electrode array in HiRes 90K system. However such decrease was not observed in CII
system.