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<p>Given the anatomical proximity of the cochlea and vestibular system, cochlear implant (CI) may affect the saccule and utricle through direct or cross-stimulation. This study aimed to evaluate the effect of CI-induced electrical stimulation on otolith organ function and postural stability in children with bilateral severe-to-profound sensorineural hearing loss. A total of 44 children aged 5–12 years participated, including 22 unilateral CI users and 22 age-matched children with normal hearing. Vestibular function was assessed using cervical and ocular vestibular evoked myogenic potentials (cVEMP and oVEMP) elicited with 500&#xa0;Hz tone bursts at 95 dBnHL, and responses were analyzed for presence or absence of waveform, latency, and amplitude. Posturography was used to measure sway velocity, maximum sway angle, and sensory function scores under both CI ON and OFF conditions. CI users showed significantly reduced cVEMP and oVEMP responses in implanted ears compared to non-implanted ears and controls, especially when the device was turned off. When the CI was activated, response rate improved notably, suggesting potential vestibular cross-stimulation. However, no significant difference in postural stability was observed between CI ON and OFF states, indicating effective sensory compensation likely mediated by vision and proprioception. These findings suggest that while CI may impact otolith organ function, balance remains preserved, possibly due to central compensation. The results highlight the need for routine vestibular assessments in pediatric CI candidates, both pre- and post-operatively, to identify subclinical deficits and inform rehabilitation strategies.</p>

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Exploring Otolith Organ Function and Postural Control in Pediatric Cochlear Implant Recipients

  • 期刊论文

  • 发表日期：

    2025年9月12日

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  • Shakshi Rai,
  • Nikita Nanavati

摘要

Given the anatomical proximity of the cochlea and vestibular system, cochlear implant (CI) may affect the saccule and utricle through direct or cross-stimulation. This study aimed to evaluate the effect of CI-induced electrical stimulation on otolith organ function and postural stability in children with bilateral severe-to-profound sensorineural hearing loss. A total of 44 children aged 5–12 years participated, including 22 unilateral CI users and 22 age-matched children with normal hearing. Vestibular function was assessed using cervical and ocular vestibular evoked myogenic potentials (cVEMP and oVEMP) elicited with 500 Hz tone bursts at 95 dBnHL, and responses were analyzed for presence or absence of waveform, latency, and amplitude. Posturography was used to measure sway velocity, maximum sway angle, and sensory function scores under both CI ON and OFF conditions. CI users showed significantly reduced cVEMP and oVEMP responses in implanted ears compared to non-implanted ears and controls, especially when the device was turned off. When the CI was activated, response rate improved notably, suggesting potential vestibular cross-stimulation. However, no significant difference in postural stability was observed between CI ON and OFF states, indicating effective sensory compensation likely mediated by vision and proprioception. These findings suggest that while CI may impact otolith organ function, balance remains preserved, possibly due to central compensation. The results highlight the need for routine vestibular assessments in pediatric CI candidates, both pre- and post-operatively, to identify subclinical deficits and inform rehabilitation strategies.