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[Cochlear implantation: relationship between speech development and insertion depth in children].

M Adamczyk1, E Bachor, H Bagus

  • 1Cochlear Implant Centrum Ruhr, Universitäts-Hals-Nasen-Ohren-Klinik Essen.

Laryngo- Rhino- Otologie
|April 26, 2001
PubMed
Summary
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Deeper insertion of cochlear implant electrode arrays in children does not significantly improve speech development. This study found no statistical difference in speech and hearing scores between shallower and deeper electrode placements.

Area of Science:

  • Otolaryngology
  • Pediatric Audiology
  • Speech-Language Pathology

Background:

  • Pediatric cochlear implantation aims to enhance hearing and speech development for mainstream schooling.
  • The impact of cochlear implant electrode array intracochlear position on speech development remains debated.

Purpose of the Study:

  • To investigate the relationship between cochlear electrode array insertion depth and speech development in pediatric cochlear implant recipients.

Main Methods:

  • 29 children received Nucleus cochlear implants (1996-1998).
  • Speech and language skills were evaluated using the Mainzer and Schmid-Giovannini tests pre- and post-implantation.
  • Electrode array position was determined by surgical records and X-ray, defining deep insertion as >24 intracochlear bands.

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Main Results:

  • Patients were grouped by insertion depth: Group 1 (≤24 bands) and Group 2 (>24 bands).
  • At 12 months post-implantation, mean closed-set test scores were 51.4% (Group 1) and 68.5% (Group 2).
  • Mean Schmid-Giovannini scores were 8.7 (Group 1) and 10.1 (Group 2), with no significant statistical difference between groups.

Conclusions:

  • Deeper insertion of the cochlear implant electrode array does not lead to improved speech development in children.
  • The study found no significant benefit in speech or hearing outcomes with more profound electrode insertion depths.