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Round window reflex and oval window fistulae.

D S Grewal1

  • 1Department of Otolaryngology and Head and Neck Surgery, T.N. Medical College, Bombay, India.

The Journal of Laryngology and Otology
|June 1, 1989
PubMed
Summary

The round window reflex is absent in oval window fistulas due to perilymph leakage. This absence serves as a key diagnostic indicator for disruptions in the oval window or stapes footplate ligament.

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Area of Science:

  • Otolaryngology
  • Neuroscience
  • Audiology

Background:

  • The round window reflex is a standard audiological test.
  • Stapedial fixation typically results in an absent round window reflex.
  • Oval window fistulas are a less common condition affecting middle ear function.

Observation:

  • This study examined six patients diagnosed with oval window fistulas.
  • The round window reflex was consistently absent in all observed cases.
  • This observation deviates from typical findings in other conductive hearing loss scenarios.

Findings:

  • Absence of the round window reflex in patients with oval window fistulas was noted.
  • The proposed mechanism involves insufficient pressure transmission through perilymph due to leakage from the oval window.
  • This finding suggests a specific diagnostic pathway for oval window pathologies.

Implications:

  • The absence of the round window reflex is a significant diagnostic sign for oval window fistulas.
  • It may indicate disruption of the oval window/stapes footplate ligament.
  • This could lead to improved diagnostic accuracy and earlier intervention for such conditions.

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