Impedance, neural response telemetry, and speech perception outcomes after reimplantation of cochlear implants in children

Catherine S. Birman*, Halit Sanli, William P. R. Gibson, Elizabeth J. Elliott

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    Abstract

    OBJECTIVE: To compare mean impedance levels, neural response telemetry (NRT), and auditory perception after initial and explant-reimplant pediatric cochlear implants. STUDY DESIGN: Retrospective case review. SETTING: Tertiary referral hospital and cochlear implant program. PATIENTS: Children 0 to 16 years inclusive who have undergone explant-reimplant of their cochlear implant. INTERVENTION: Impedance levels, NRT, and speech perception performance. MAIN OUTCOME MEASURES: Impedance, NRT, and auditory perception at switch on, 3 months, 12 months, 3 years, and 5 years after initial cochlear implant and reimplantation. RESULTS: The explant-reimplant group receiving Cochlear contour array had significantly (p < 0.001) raised impedance at switch on, 3 months, 12 months, and 3 years, compared with their initial implant. The explant-reimplant group receiving Cochlear straight array had marginally significant (p = 0.045) raised impedance at switch on, 3 months, 12 months, and 3 and 5 years. Infection was associated with greater increases in impedance in the reimplant Contour group. NRT was increased in the explant-reimplant group but not significantly (p = 0.06). Auditory perception returned to preexplant levels within 6 months in 61% of children. CONCLUSION: Impedance is higher after explant-reimplant and remains increased for years after explant-reimplant with Cochlear contour and to a lesser degree the straight array device.

    Original languageEnglish
    Pages (from-to)1385-1393
    Number of pages9
    JournalOtology and Neurotology
    Volume35
    Issue number8
    DOIs
    Publication statusPublished - Sep 2014

    Keywords

    • cochlear explant
    • electrode impedance
    • fibrosis
    • language outcomes
    • neural response telemetry
    • pediatric
    • reimplantation

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