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Related Experiment Videos

Absent round window reflex: possible relation to step-wise hearing loss

S A Harvey1, S J Millen

  • 1Medical College of Wisconsin, Department of Otolaryngology and Human Communication, Milwaukee.

The American Journal of Otology
|March 1, 1994
PubMed
Summary

Diagnosing perilymphatic fistulas is challenging due to varied symptoms and lack of definitive tests. Some children with suspected fistulas instead showed absent round window reflexes, suggesting altered inner ear fluid dynamics.

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Area of Science:

  • Otolaryngology
  • Audiology
  • Pediatric Medicine

Background:

  • Perilymphatic fistula diagnosis is difficult, lacking reliable clinical or laboratory tests.
  • Surgical exploration, the current diagnostic standard, often yields no active fistula evidence.
  • Varied signs and symptoms contribute to diagnostic confusion and potential errors.

Observation:

  • Four children with suspected perilymphatic fistulas were explored.
  • These children presented with abrupt, step-wise hearing threshold decreases.
  • Hearing loss progressed from mixed to purely sensorineural, with normal ossicular mobility.

Findings:

  • Exploration revealed an absent round window reflex in these children.
  • High-resolution computed tomography showed no anatomical abnormalities.

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  • The findings suggest potential altered inner ear fluid dynamics.

    • Implications:

    • This condition may represent a healed perilymphatic fistula or a distinct inner ear disorder.
    • Further research is needed to confirm the pathophysiology and diagnostic criteria.
    • Understanding this presentation could improve diagnosis and management of pediatric hearing loss.