Auditory Brainstem Implant (ABI)
(Pre and Post Operative Assessments (TTEABR)/ Mapping/ Habilitation)
An Auditory Brainstem Implant (ABI) is a modified cochlear implant intended to be used to stimulate the cochlear nucleus in the brainstem of patients who have had their eighth
nerves severed during surgery for removal of bilateral neurofibromata, as in patients with Neurofibromatosis 2 (NF2).
The cochlear implant linear array of electrode contacts is replaced by a small rectangular silastic paddle containing the 21 contacts. This is surgically inserted into the lateral recess of the fourth ventricle. The need for this device is much less common than that for a cochlear implant, but these patients are typically totally deaf and, although the benefit is
not as great on the average as that of the cochlear implant, most recipients derive significant auditory perception.