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Stimulation parameters differ between current anti-modiolar and peri-modiolar electrode arrays implanted within the

M J Polonenko¹, S L Cushing¹, K A Gordon¹

¹Archie's Cochlear Implant Laboratory,Department of Otolaryngology,Hospital for Sick Children,Toronto,Canada.

The Journal of Laryngology and Otology

|October 15, 2016

Summary

Bilateral cochlear implants showed significant differences in stimulation parameters between peri-modiolar and anti-modiolar electrode arrays in children. These differences were clinically acceptable up to four months post-surgery, with surgical approach not impacting outcomes.

Keywords:

Cochlear Implant Electric Stimulation Electrode Prosthesis Fitting

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Area of Science:

Otolaryngology
Biomedical Engineering
Neuroscience

Background:

Cochlear implants (CIs) are crucial for hearing restoration in severe to profound sensorineural hearing loss.
Electrode array design and surgical insertion technique can influence CI performance.
Understanding stimulation parameter differences between array types is vital for optimizing auditory perception.

Purpose of the Study:

To compare stimulation parameters between peri-modiolar and anti-modiolar electrode arrays in pediatric bilateral CI users.
To evaluate the impact of surgical approach (cochleostomy vs. round window) on anti-modiolar array performance.

Main Methods:

A comparative study involving 64 children with bilateral cochlear implants.
Stimulation parameters including impedance, thresholds, and comfort levels were measured at multiple time points (surgery, activation, 1 week, 1 month, 3 months).
Peri-modiolar arrays were implanted via cochleostomy; anti-modiolar arrays were implanted via cochleostomy (n=43) or round window (n=21).

Main Results:

The anti-modiolar array exhibited significantly lower impedance but required higher current levels for eliciting thresholds compared to the peri-modiolar array.
These differences were consistent across all measurement time points and particularly pronounced in basal electrodes.
The prevalence of open electrodes was comparable between the two array types.

Conclusions:

Clinically acceptable differences in stimulation parameters between peri-modiolar and anti-modiolar arrays persist up to four months post-surgery in pediatric bilateral CI users.
The surgical approach for the anti-modiolar array insertion did not significantly affect the overall outcomes.
These findings aid in understanding electrode array characteristics and optimizing CI programming for pediatric patients.