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I have bilateral CI. My first implant (Mi1000 MED_EL CONCERT, Flex 28 on left ear) was successful but the second implant is not working from day one. It has sound but little speech recognition (about 11%). The sound is very high pitched as test shows that electrode number 11 and 12 are drawing high current and had to be disabled for mapping. In addition, CT scan showed that the bad ear has the electrode array inserted to the middle of the cochlear not at the apical area. Not sure if this is electrode migration. I am looking into redoing the implant. Do anyone have the same problem and share the experience? Thank you. James Luk