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Outcome of Cochlear Implantation in Children With Narrow Bony Cochlear Nerve Canal

Byung Chul Kang1, Jee Yeon Lee2, Yehree Kim2

  • 1Department of Otorhinolaryngology-Head and Neck Surgery, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|June 21, 2019
PubMed

Insights

Children with a narrow bony cochlear nerve canal (BCNC) show limited auditory improvement after cochlear implantation (CI). Narrower BCNC diameter correlates with more severe limitations, but early CI and rehabilitation are still beneficial.

Area of Science:

  • Otolaryngology
  • Pediatric Audiology
  • Neurosurgery

Background:

  • Cochlear implantation (CI) is a vital treatment for pediatric hearing loss.
  • Predicting auditory outcomes in pediatric CI candidates is crucial for effective management.

Purpose of the Study:

  • To evaluate the bony cochlear nerve canal (BCNC) diameter as a prognostic indicator for cochlear implantation (CI) success in children.
  • To determine the correlation between BCNC dimensions and postoperative auditory performance.

Main Methods:

  • Retrospective analysis of 323 ears from 292 prelingual deaf children who underwent CI before age 5.
  • Temporal bone CT scans were used to categorize BCNC diameter: narrow (<1.4 mm), normal, and other anomalies.
  • Postoperative auditory performance (Category of Audiological Performance - CAP scores) was analyzed using the Mann-Whitney U test.

Main Results:

  • Children with narrow BCNC (Group 1, 10.5%) demonstrated significantly less auditory improvement compared to normal (Group 2, 57.3%) and anomalous (Group 3, 32.2%) BCNC.
  • Lower scores on open-set word and sentence tests were observed in the narrow BCNC group.
  • Complete BCNC stenosis (<0.2 mm) was associated with the poorest CAP scores.

Conclusions:

  • A narrow BCNC diameter is associated with limited auditory performance gains following pediatric CI.
  • The degree of auditory limitation is proportional to the narrowness of the BCNC.
  • Despite limitations, children with narrow BCNC can still benefit from early CI and auditory rehabilitation.
Abstract

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