Cochlear Implant Electrostimulation and the Influence on the Vestibular Organ

Inclusion Criteria: * uni- or bilaterally deafened and deaf patients with cochlear implants (one- or two- sided) from Advanced Bionics (AB), model HiRes 90K and newer * majority * given informed consent * legally competent and mentally able to follow the instructions of the personnel Exclusion Criteria: * unsuccessful CI implantation (device or electrode defects, incomplete electrode array insertion, missing neuronal stimulus responses) * pregnant and/or breastfeeding women * severe pre- or concomitant disease or reduced general ground condition, so that an outpatient presentation in the ENT polyclinic is not possible * life expectancy of less than six months * the patient has received a study medication within the last 30 days within the framework of another study * simultaneous participation in another clinical intervention study * anticipated lack of compliance * alcohol or drug abuse * the patient is placed in an institution by order of the authorities or court * patients who are in a dependent or employed relationship with the sponsor, investigator, or their deputy