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Related Experiment Videos

Postural control and vestibulospinal function in patients selected for cochlear implantation

M Magnusson1, H Petersen, S Harris

  • 1Department of Oto-Rhino-Laryngology, University Hospital of Lund, Sweden.

British Journal of Audiology
|August 1, 1995
PubMed
Summary

Post-lingual deafness is linked to poorer postural control, especially with calf vibration. However, vestibular nerve stimulation did not significantly differ between deaf patients and controls, suggesting unique sensitivities.

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Area of Science:

  • Neuroscience
  • Audiology
  • Vestibular System

Background:

  • Postural control is crucial for balance and relies on sensory input, including vestibular and proprioceptive information.
  • Cochlear implantation (CI) is a common treatment for post-lingual deafness, but some patients report dizziness post-surgery.
  • The impact of pre-operative deafness on postural control and vestibular function requires further investigation.

Purpose of the Study:

  • To evaluate postural control, vestibular, and eye motor function in post-lingually deaf patients before cochlear implantation.
  • To compare these functions between deaf patients and healthy controls.
  • To investigate the sensitivity of deaf patients to vestibular nerve stimulation.

Main Methods:

  • Assessed postural control using vibration-induced and galvanic vestibular stimulation (GVS) in 7 post-lingually deaf patients and 21 controls.

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  • Measured body sway velocity, antero-posterior sway variance, and postural dynamics parameters.
  • Evaluated responses to calf muscle vibration and electrical stimulation of vestibular nerves.

    • Main Results:

    • Post-lingually deaf patients exhibited increased body sway with calf vibration, indicating reduced postural control compared to controls.
    • GVS did not induce significantly different body sway between patients and controls.
    • Deaf patients sensitive to electrical promontorial stimulation also showed increased body sway with GVS.

    Conclusions:

    • Post-lingual deafness is associated with impaired postural control, potentially exacerbated by proprioceptive deficits.
    • While GVS responses were similar, the findings suggest that cochlear implant candidates with reduced postural control are sensitive to vestibular nerve electrical stimulation.
    • This sensitivity may offer an additional explanation for post-CI dizziness, beyond electrode placement or surgical injury.