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Updated: Jun 2, 2026

Performing Intracochlear Electrocochleography During Cochlear Implantation
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Published on: March 8, 2022

Graphic angle measure as an electrocochleography evaluation parameter.

Karen de Carvalho Lopes1, Mário Sérgio Lei Munhoz, Marco Aurélio Rocha Santos

  • 1Department of Otolaryngology, Federal University of São Paulo, Sao Paulo, Brazil.

Brazilian Journal of Otorhinolaryngology
|May 4, 2011
PubMed
Summary

Graphic angle measurement alone is not sensitive or specific enough for diagnosing Menière

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Area of Science:

  • Audiology
  • Neurology
  • Otolaryngology

Background:

  • Menière's disease diagnosis relies on clinical symptoms and specific tests.
  • Electrocochleography (ECoG) is a key diagnostic tool, but its sensitivity can be limited.
  • New methods are explored to enhance ECoG's diagnostic accuracy for Menière's disease.

Purpose of the Study:

  • To evaluate the diagnostic sensitivity and specificity of graphic angle measurement in Menière's disease.
  • To determine if combining graphic angle measurement with the Summating Potential/Action Potential (SP/AP) ratio improves ECoG's diagnostic performance.

Main Methods:

  • Electrocochleography was performed on 71 ears from 55 subjects (41 with Menière's disease, 14 controls).
  • Graphic results were analyzed for SP/AP ratio and graphic angle measurements.

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  • Statistical analysis assessed sensitivity and specificity of individual and combined measures.

    • Main Results:

    • Graphic angle measurement alone showed limited sensitivity and specificity for Menière's disease diagnosis.
    • The highest equilibrium between sensitivity (62.79%) and specificity (60.71%) was found at specific cutoff points for angle and SP/AP ratio.
    • Combining angle measurement with SP/AP ratio increased sensitivity (88.37%) but decreased specificity (50%).

    Conclusions:

    • Graphic angle measurement is insufficient as a standalone diagnostic tool for Menière's disease.
    • While the combination of graphic angle measurement and SP/AP ratio enhances sensitivity, it compromises the specificity of the electrocochleography test.