ArticleEuropean archives of oto-rhino-laryngology : official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery2026
Regional analysis of impedance shifts in paediatric cochlear implantation: insights into early electrode-tissue interface dynamics.
Article in European archives of oto-rhino-laryngology : official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeImpedance telemetry objectively reflects the electrode–tissue interface and provides quantitative information on early postoperative impedance behavior after cochlear implantation. This study examined regional impedance shifts from surgery to early follow-up in paediatric recipients.
methodsIn a prospective cohort of 51 children (< 14 years) implanted with identical 22-electrode arrays, intraoperative impedances were recorded and compared with 3-month postoperative values. Electrodes were grouped by region: basal (E1–E8), mid-turn (E9–E14), and apical segment (E15–E22), and analysed for median impedance changes by region, frequency, and persistence of anomalies, as well as inter-regional correlations.
resultsThe most significant change occurred in the basal segment, where median impedance increased from 7.75 to 9.38 kΩ (p < 0.0001), remained unchanged in the mid-turn (9.0 kΩ), and decreased slightly from 10.13 to 10.0 kΩ in the apical segment. Impedance shifts were strongly correlated across cochlear regions (rs = 0.65–0.91, p < 0.001), except for a weaker association between the basal and apical segments (rs = 0.36, p < 0.05). Among the 1,122 recorded electrode contacts, six displayed open- or short-circuit anomalies intraoperatively; most persisted at the same contacts, with one short circuit resolving and no new anomalies detected at 3 months.
conclusionEarly postoperative impedance rises most prominently in basal segment contacts, consistent with expected early postoperative changes at the electrode–tissue interface, while mid-turn and apical segment contacts mostly remain stable or decline slightly. Ongoing impedance monitoring from implantation through early follow-up is vital for evaluating the electrode–tissue interface, optimising device programming, and identifying electrodes requiring deactivation or closer surveillance.
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