Vestibular dysfunction after cochlear and auditory brainstem implantation: Madras ENT Research Foundation experience

Authors

  • Kiran Natarajan Department of ENT, Madras ENT Research Foundation, Chennai, Tamil Nadu, India
  • Sathiya Murali Department of ENT, Madras ENT Research Foundation, Chennai, Tamil Nadu, India
  • Santhosh M. Kumar Department of ENT, Madras ENT Research Foundation, Chennai, Tamil Nadu, India
  • Manjunatha H. Anandappa Department of ENT, Madras ENT Research Foundation, Chennai, Tamil Nadu, India
  • Adarsh Panicker Department of ENT, Madras ENT Research Foundation, Chennai, Tamil Nadu, India
  • Mohan Kameswaran Department of ENT, Madras ENT Research Foundation, Chennai, Tamil Nadu, India

DOI:

https://doi.org/10.18203/issn.2454-5929.ijohns20210687

Keywords:

Cochlear implantation, Auditory brainstem implantation, Vestibular disturbance

Abstract

Background: Cochlear implantation is an established procedure for patients with bilateral severe to profound sensorineural hearing loss. CI may, in some implantees, have a detrimental impact on vestibular function. Auditory brainstem implantation is a safe and effective procedure in children with bilateral cochlear and cochlear nerve aplasia. The aim of the study was to assess the impact of cochlear implantation and auditory brainstem implantation on the vestibular function.

Methods: Three hundred and twenty patients who underwent CI surgery over a four years period from November 2016 to November 2020 were studied for symptoms of vestibular disturbance. Twenty three patients complained of giddiness and underwent vestibular function testing including videooculography, caloric test and vestibular evoked myogenic potentials. 48 patients with cochlear and cochlear nerve aplasia underwent ABI surgery from September 2009 to March 2019. The correlation between the size of the flocculus and the presence of vestibular symptoms was studied.

Results: After CI, vestibular disturbances were seen in 23 patients (7.2%) and were transient. In auditory brainstem implantees, vestibular disturbances were seen in eight patients (16.7%) and were found to correlate with the size of the cerebellar flocculus.

Conclusions: Vestibular disturbances are rare after cochlear and auditory brainstem implant surgery. During CI, the preservation of vestibular function should be attempted using minimally invasive techniques. ABI surgery requires meticulous dissection, especially of a large cerebellar flocculus to minimize the possibility of vestibular disturbances.

Author Biographies

Kiran Natarajan, Department of ENT, Madras ENT Research Foundation, Chennai, Tamil Nadu, India

CONSULTANT ENT SURGEON,

DEPARTMENT OF OTOLARYNGOLOGY,

MADRAS ENT RESEARCH FOUNDATION, CHENNAI

Sathiya Murali, Department of ENT, Madras ENT Research Foundation, Chennai, Tamil Nadu, India

CONSULTANT ENT SURGEON,

DEPARTMENT OF OTOLARYNGOLOGY,

MADRAS ENT RESEARCH FOUNDATION, CHENNAI

Santhosh M. Kumar, Department of ENT, Madras ENT Research Foundation, Chennai, Tamil Nadu, India

Fellow, Implantation Otology
Madras ENT Research Foundation,
Chennai

Manjunatha H. Anandappa, Department of ENT, Madras ENT Research Foundation, Chennai, Tamil Nadu, India

Fellow, Implantation Otology
Madras ENT Research Foundation,
Chennai

Adarsh Panicker, Department of ENT, Madras ENT Research Foundation, Chennai, Tamil Nadu, India

ENT Postgraduate
Madras ENT Research Foundation,
Chennai

Mohan Kameswaran, Department of ENT, Madras ENT Research Foundation, Chennai, Tamil Nadu, India

SENIOR CONSULTANT ENT SURGEON,
MADRAS ENT RESEARCH FOUNDATION, CHENNAI

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Published

2021-02-24

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Original Research Articles