Comparison of the individual electrode position after cochlear implantation with the patient-specific C and T levels

Introduction To restore Cochlear implantation (CI) allows the restoration of hearing. An important role for the hearing impression and speech understanding of the patient is the position of the electrode array within the cochlea. A recent study has developed a method for analysing the positions of the electrodes within the cochlea to improve future electrode arrays and biological therapies. Considering the associated patient settings (C-/-T level) these data were examined to link geometric results with audiological data.

Material and methods In a retrospective study the position of 93 implanted cochlear electrodes (MED-EL, Flex16, 20, 24, 28) were analysed (CBCT, insertion depth, insertion angle, distance to the lateral / modiolar wall). The minimal electrical stimulation that the auditory system required to perceive sounds is reflected in the T-level. The C-level is the upper limit of the electrical stimulation (loud, but still comfortable). These T and C levels determined during first adjusting of the patient were correlated with the geometric location of the associated electrodes.

Results The different electrode arrays showed similar profiles with respect to the electrode distance to the modiolar and lateral cochlear wall. At the basal end the arrays lay closer to the modiolar wall and moved into a more lateral position apical.

Conclusion For individualized care with a CI, a combination of postoperative anatomical data of the patient in conjunction with retrospective analysis is a future strategy for optimizing future electrode arrays.

Poster-PDF A-1930.PDF

Publication History

Article published online:
10 June 2020