Conclusion: In this study, we concluded that electrode design and location did not have a high level of influence on the prevalence of facial nerve stimulation (FNS) in normal cochleae.
Objective: To analysis the prevalence of FNS after cochlear implantation with Nucleus 24-channel devices according to types of electrodes arrays.
Patients And Methods: We retrospectively analyzed medical and mapping records of 394 patients who received cochlear implants (CIs) manufactured by Cochlear Corporation from April 1999 to March 2007.
Results: In all, 23 of 394 (5.8%) patients had FNS (CI24M 4 of 39 [10.3%], CI24RCS 9 of 192 [4.7%], CI24RST 9 of 21 [42.9%], and CI24RECA 1 of 87 [1.1%]). In addition, 4 of 324 (1.2%) patients with normal cochleae complained of FNS (CI24M 1 of 33 [3.0%], CI24RCS 2 of 173 [1.2%], and CI24RECA 1 of 71 [1.4%]). There was no difference between straight and perimodiolar electrode arrays in patients with normal cochleae. In addition, when comparing two types of Contour electrodes, Contour Advance (soft-tip) electrodes offered significantly lower incidence of FNS than Contour electrode arrays. We could manage these patients with methods such as decrease of C-level, selective channel turning off, and changes of mapping strategies.
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