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Electrocochleography (EcoG)

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Electrocochleography (EcoG): Electrocochleography (EcoG) measures the summated intracellular potentials of the outer hair cells seen in response to an auditory stimulus. The electrical response is either due to cochlear microphonic potentials(electrical activity in the cochlea), summating potentials(a complex measurement of many electrophysiological parameters taken together) or electrical activity due to action potential of 8th nerve. It is an objective test that provides a reasonably accurate measurement of the hearing threshold between 1000 to 8000 Hz. No masking in the contralateral ear is required.


 
A schematic illustration of the placement of the transtympanic needle electrode and the electrocochleographic waveforms.

Procedure: The electrical activity can be detected by inserting a needle-like thin, active recording electrode through the tympanic membrane and placing onto the promontory or round window. The reference and ground electrodes are placed on the mastoid process and on the forehead respectively. It is usually done under sedation or local anaesthesia.

Uses of EcoG:

  • To diagnose Meniere’s disease.
  • To detect hearing threshold in the young infants and children within 5–10 dB
  • To differentiate cochlear lesions from eighth nerve lesions. 
  • To monitor cochlea and cochlear nerve during neurotological surgical procedure.

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Download full PDF Link:

Electrocochleography (ECoG) Best Lecture Notes Dr Rahul Bagla ENT Textbook


Reference Textbooks.

  • Scott-Brown, Textbook of Otorhinolaryngology-Head and Neck Surgery.
  • Glasscock-Shambaugh, Textbook of Surgery of the Ear.
  • P L Dhingra, Textbook of Diseases of Ear, Nose and Throat.
  • Hazarika P, Textbook of Ear Nose Throat And Head Neck Surgery Clinical Practical.
  • Mohan Bansal, Textbook of Diseases of Ear, Nose and Throat Head and Neck Surgery
  • Hans Behrbohm, Textbook of Ear, Nose, and Throat Diseases With Head and Neck Surgery.
  • Salah Mansour, Middle Ear Diseases – Advances in Diagnosis and Management.
  • Logan Turner, Textbook of Diseases of The Nose, Throat and Ear Head And Neck Surgery.
  • Rob and smith, Textbook of Operative surgery.
  • Anirban Biswas, Textbook of Clinical Audio-vestibulometry.
  • Arnold, U. Ganzer, Textbook of  Otorhinolaryngology, Head and Neck Surgery.

Author:

Dr. Rahul Bagla ENT Textbook

Dr. Rahul Bagla
MBBS (MAMC, Delhi) MS ENT (UCMS, Delhi)
Fellow Rhinoplasty & Facial Plastic Surgery.
Renowned Teaching Faculty
Mail: msrahulbagla@gmail.com
India

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