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Related Experiment Videos

Summating potential/action potential ratio in perilymph fistula.

W L Meyerhoff1, M W Yellin

  • 1Department of Otorhinolaryngology, University of Texas Southwestern Medical Center, Dallas 75235-9035.

Otolaryngology--Head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery
|June 1, 1990
PubMed
Summary

Electrocochleography can help predict perilymph fistula and endolymphatic hydrops. An abnormal summating potential/action potential (SP/AP) ratio suggests inner ear fluid imbalance, aiding diagnosis.

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Area of Science:

  • Otolaryngology
  • Neuroscience
  • Audiology

Background:

  • Perilymph fistula is a challenging diagnosis.
  • Electrocochleography measures inner ear electrical activity.
  • The summating potential/action potential (SP/AP) ratio is a key electrocochleography metric.

Purpose of the Study:

  • To evaluate the predictive value of electrocochleography for perilymph fistula.
  • To correlate SP/AP ratio abnormalities with surgical findings and outcomes.

Main Methods:

  • Prospective study of 144 patients with suspected perilymph fistula.
  • Electrocochleography performed on all patients.
  • Exploratory tympanotomy conducted on 34 patients (39 ears).

Main Results:

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  • 10 of 19 ears with normal SP/AP ratio had perilymph fistula.
  • 16 of 20 ears with abnormal SP/AP ratio had confirmed perilymph fistula.
  • 18 ears with abnormal SP/AP ratio showed symptom resolution after grafting.

Conclusions:

  • An abnormal SP/AP ratio predicts both endolymphatic hydrops and perilymph fistula.
  • Abnormal SP/AP ratio is specific but not sensitive for inner ear fluid imbalance.