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Apical and medial contacts generally stabilized or declined thereafter. In contrast, basal electrodes exhibited more heterogeneous patterns, including increases during 12 to 60\u2009months of follow-up and decreases during 60 to 120\u2009months. Compared to PM arrays, LW electrodes showed higher apical impedances, medial impedances that were mostly comparable and time-dependent, and persistently lower basal impedances than CI512. Among LW arrays, CI422 consistently demonstrated the highest impedance, whereas the MED-EL electrode series, Flexsoft exhibited the highest impedance. Overall impedances were higher in early childhood recipients, while adults tended to show higher values in the basal region.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>This study provides the first decade-long characterization of impedance changes, revealing dynamic variations in electrode impedance across different designs and age groups of cochlear implant recipients.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Relevance<\/jats:title>\n                    <jats:p>This study highlights the need for long-term monitoring and offering practical guidance for individualized programming and electrode design.<\/jats:p>\n                  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