Cochlear implant stimulation parameters depending on the type of electrode array
  Pashkova A.E.1, Naumova I.V.1, Voevodina K.I.1, Pashkov A.V.1,2
 1 Pediatric and Child Health Research Institute of the Petrovsky National Research Centre of Surgery, Moscow, Russian Federation
 2 Central State Medical Academy of Department of Presidential Affairs, Moscow, Russian Federation
▪ Objectives
Among the many factors affecting the results of cochlear implantation (CI), the design of the electrode array determines the distance between the contact of the electrode and the spiral ganglion of the auditory nerve. The perimodiolar electrode array (due to the shape memory effect) is positioned along the medial wall of the cochlea canal in close proximity to the modiolus, whereas the straight one is located along the lateral wall. The aim of our study is to assess the relationship between the electrophysiological responses of the auditory nerve (electrically evoked compound action potential - ECAP) and the levels of comfortable stimulation (С - levels) of the fitting map in patients with good speech intelligibility.
▪ Methods
30 patients aged 6 to 17 years (average 10, 73 土 3.05) after unilateral cochlear implantation with good speech intelligibility (above 90%). 15 patients are users of the Cochlear Ci 512 (perimodiolar electrode array) CI system with CP 910 processor, 15 patients use the Med-El system (straight electrode array, standard electrode) with a Sonnet 2 processor. We were compared of the relationship between the values of ECAP thresholds and C - levels (as percentage) in groups with straight and perimodiolar electrode arrays.
▪ Results
Comparison of the values of the thresholds of comfortable stimulation on the channels of CI systems in comparison with ECAP thresholds showed that in systems with a perimodiolar array, the differences between these indicators are lower (2.5 土 2%, p <0.05) than in systems with a straight electrode array (30.6土6,05%, p<0.05).
▪ Conclusion
Understanding of the relationship between ECAP thresholds and С - levels increases the efficiency of fitting CI processors in patients with different types of electrode arrays. This is important in young children and patients with combined neurological pathology.

Cochlear implant stimulation parameters depending on the type of electrode array
  Pashkova A.E.^1^, Naumova I.V.^1^, Voevodina K.I.^1^, Pashkov A.V.^1,2^
 ^1^ Pediatric and Child Health Research Institute of the Petrovsky National Research Centre of Surgery, Moscow, Russian Federation
 ^2^ Central State Medical Academy of Department of Presidential Affairs, Moscow, Russian Federation
▪ Objectives
Among the many factors affecting the results of cochlear implantation (CI), the design of the electrode array determines the distance between the contact of the electrode and the spiral ganglion of the auditory nerve. The perimodiolar electrode array (due to the shape memory effect) is positioned along the medial wall of the cochlea canal in close proximity to the modiolus, whereas the straight one is located along the lateral wall. The aim of our study is to assess the relationship between the electrophysiological responses of the auditory nerve (electrically evoked compound action potential - ECAP) and the levels of comfortable stimulation (С - levels) of the fitting map in patients with good speech intelligibility.
▪ Methods
30 patients aged 6 to 17 years (average 10, 73 土 3.05) after unilateral cochlear implantation with good speech intelligibility (above 90%). 15 patients are users of the Cochlear Ci 512 (perimodiolar electrode array) CI system with CP 910 processor, 15 patients use the Med-El system (straight electrode array, standard electrode) with a Sonnet 2 processor. We were compared of the relationship between the values of ECAP thresholds and C - levels (as percentage) in groups with straight and perimodiolar electrode arrays.
▪ Results
Comparison of the values of the thresholds of comfortable stimulation on the channels of CI systems in comparison with ECAP thresholds showed that in systems with a perimodiolar array, the differences between these indicators are lower (2.5 土 2%, p <0.05) than in systems with a straight electrode array (30.6土6,05%, p<0.05).
▪ Conclusion
Understanding of the relationship between ECAP thresholds and С - levels increases the efficiency of fitting CI processors in patients with different types of electrode arrays. This is important in young children and patients with combined neurological pathology.

Cochlear implant stimulation parameters depending on the type of electrode array

It is with great pleasure and enthusiasm, that on behalf of the Cochlear Implant centers of the Radboud UMC in Nijmegen and Erasmus MC Sophia Children’s Hospital in Rotterdam to invite you to attend the 16th European Symposium on Pediatric Cochlear Implantation to Rotterdam, the Netherlands in 2023.

Yours sincerely, on behalf of the CI Centers at Radboud UMC and Erasmus MC,