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Evaluating hearing threshold differences between ears as a screen for acoustic neuroma

R S Schlauch1, S Levine, Y Li

  • 1Department of Communication Disorders, University of Minnesota, Minneapolis, USA.

Journal of Speech and Hearing Research
|October 1, 1995
PubMed
Summary
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Pure tone threshold differences between ears show limited effectiveness as a sole screening tool for acoustic neuroma (AN). Combining this measure with other criteria is crucial for accurate AN identification.

Area of Science:

  • Audiology
  • Neurology
  • Oncology

Background:

  • Acoustic neuroma (AN) is a tumor on the auditory nerve.
  • Early detection of AN is critical for effective treatment.
  • Pure tone threshold (PTT) differences between ears are sometimes used as a screening measure for AN.

Purpose of the Study:

  • To evaluate the diagnostic value of interaural pure tone threshold differences as a screening tool for acoustic neuroma.
  • To assess the effectiveness of PTT differences in identifying tumors in different patient groups.

Main Methods:

  • Audiograms from patients with and without acoustic neuroma were analyzed.
  • True positive and false positive rates were calculated for various decision rules based on PTT differences.
  • Data were collected from two distinct patient care facilities.

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Main Results:

  • Interaural PTT differences were more effective in screening for AN in females than in males.
  • The efficiency of PTT differences alone as a diagnostic tool was found to be mediocre.
  • Tumor size did not correlate with the degree of PTT asymmetry, indicating potential for missed diagnoses of larger tumors.

Conclusions:

  • Pure tone threshold differences alone are insufficient for reliable acoustic neuroma screening.
  • Combining PTT asymmetry with other clinical criteria is necessary for cost-effective and accurate AN identification.
  • Reliance solely on PTT differences may lead to the omission of significant, potentially life-threatening acoustic neuromas.