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Hearing thresholds shifts relative to baseline values after sham procedure or cochlear implant (CI) electrode array insertion, respectively. Sham procedure, consisting of a cochleostomy alone, did not cause a significant threshold shift up to 2 h postoperatively (A). In contrast, CI electrode array insertions lead to a significant hearing loss immediately after implantation (0 h) which progressed after 1 h and 2 h (B).
