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The inner ear assumes dual functionalities of auditory perception and equilibrium maintenance. The vestibule is the organ responsible for balance. This organ contains mechanoreceptors, specifically hair cells, endowed with stereocilia, which aid in deciphering information regarding the position and motion of our heads. Two intrinsic components, the utricle and saccule, help perceive head position, while the semicircular canals track head movement. Neurological messages initiated in the...
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Changes in Vestibular Function Following Pediatric Cochlear Implantation: a Prospective Study.

Cleo Dhondt1, Leen Maes2,3, Saartje Vanaudenaerde3

  • 1Department of Head and Skin, Ghent University, Ghent, Belgium.

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Summary

Cochlear implantation (CI) in children generally shows limited impact on vestibular function, with few cases of complete function loss. Bilateral implantation benefits may outweigh risks, but individualized assessment is crucial for optimal outcomes.

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Area of Science:

  • Otolaryngology
  • Neuroscience
  • Pediatric Audiology

Background:

  • Cochlear implantation (CI) is increasingly used in children, raising concerns about its effects on the vestibular system due to the auditory and vestibular organs' close proximity.
  • Existing literature on the impact of pediatric CI on vestibular function is inconclusive and limited.

Purpose of the Study:

  • To investigate the impact of pediatric cochlear implantation on vestibular function in a large, representative sample of children.
  • To provide clearer insights into potential vestibular deficits following CI in pediatric populations.

Main Methods:

  • Prospective study of 50 hearing-impaired children (27 unilateral CI, 23 bilateral CI) at Ghent University Hospital.
  • Vestibular assessments included video Head Impulse Testing, rotatory testing, and cervical vestibular evoked myogenic potential (cVEMP) testing before and after implantation.
  • Caloric testing was performed in children over 3 years old.

Main Results:

  • Group analysis of 73 CI-ears showed no significant overall impact on vestibular function.
  • A significant shortening of ipsilateral N1 latency in cVEMP responses was observed post-CI (p = 0.027).
  • Complete ipsilateral vestibular function loss occurred in a small percentage of cases (5% on vHIT, 2% on cVEMP), primarily in children with congenital cytomegalovirus infection.

Conclusions:

  • The impact of cochlear implantation on pediatric vestibular function appears limited, suggesting the benefits of bilateral CI may outweigh surgical risks.
  • Vestibular function post-CI can be influenced by factors like the etiology of hearing loss, making outcomes difficult to predict.
  • Continued vestibular assessment is vital for decision-making in pediatric CI and for identifying additional sensory deficits to guide rehabilitation.