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Vestibular Function After Bilateral Simultaneous Cochlear Implantation.

Tao Yan1,2, Fangru Zong3, Xiao Han1,2

  • 1Department of Otorhinolaryngology, Qilu Hospital of Shandong University.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|May 10, 2021
PubMed
Summary
This summary is machine-generated.

Bilateral simultaneous cochlear implantation (CI) preserved high-frequency vestibular function but negatively impacted low-frequency and saccule function. Dizziness Handicap Inventory scores were higher in patients with large vestibular aqueduct syndrome.

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Area of Science:

  • Otorhinolaryngology
  • Neuroscience
  • Audiology

Background:

  • Bilateral cochlear implantation (CI) is increasingly common for profound hearing loss, offering benefits in hearing-in-noise and spatial orientation.
  • Understanding the impact of bilateral CI on vestibular function is crucial for comprehensive patient management.

Purpose of the Study:

  • To investigate the effects of bilateral simultaneous cochlear implantation on vestibular function in patients with profound hearing loss.

Main Methods:

  • Retrospective analysis of 16 patients undergoing bilateral simultaneous CI.
  • Preoperative and 4-month postoperative evaluation of vestibular function using objective (caloric tests, VEMPs, vHIT) and subjective (DHI) measures.

Main Results:

  • Preoperatively, 50% of patients had abnormal caloric tests, and VEMP results indicated dysfunction in 18.8% to 34.4% of ears.
  • Surgery significantly reduced caloric test results (p<0.05) and increased abnormal cervical VEMP rates (p<0.05).
  • No significant postoperative changes were observed in Ocular VEMPs, vHIT, or DHI scores overall, though DHI correlated with vHIT and caloric test results.

Conclusions:

  • Bilateral simultaneous CI preserves high-frequency vestibular function (utricle) but can impair low-frequency function and saccule function.
  • Patients with large vestibular aqueduct syndrome reported significantly higher dizziness handicap.
  • Vestibular function changes post-CI did not correlate with improved speech recognition scores.