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Contralateral auditory brainstem response abnormalities in acoustic neuroma.

D A Moffat1, D M Baguley, D G Hardy

  • 1Department of Otolaryngology, Addenbrooke's Hospital, Cambridge.

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

Most patients with unilateral acoustic neuroma show normal contralateral Auditory Brainstem Response (ABR). Larger tumors correlate with increased ABR abnormalities, suggesting brainstem compression impacts wave generator sites.

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Area of Science:

  • Neuroscience
  • Audiology
  • Neurosurgery

Background:

  • Unilateral acoustic neuromas can affect auditory pathways.
  • Auditory Brainstem Response (ABR) is a key diagnostic tool for hearing and brainstem function.

Purpose of the Study:

  • To analyze contralateral Auditory Brainstem Response (ABR) findings in patients with unilateral acoustic neuroma.
  • To establish the relationship between acoustic neuroma tumor size and contralateral ABR abnormalities.

Main Methods:

  • Retrospective analysis of contralateral ABR data from 79 patients with unilateral acoustic neuroma.
  • Tumor size assessed using computed axial tomography (CT).
  • Correlation analysis between tumor size (intracanalicular, medium, large) and ABR parameters (latency, interwave intervals).

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Main Results:

  • 81% of patients had normal contralateral ABR; 16.4% showed latency abnormalities.
  • Contralateral ABR abnormalities were more frequent with larger tumors (25.6% for >2.5 cm) compared to medium (14% for 1.0-2.5 cm) and small tumors (0%).
  • Specific abnormalities included abnormal I-III and III-V interwave intervals, and abnormal wave V latency.

Conclusions:

  • Contralateral ABR remains normal in the majority of unilateral acoustic neuroma cases.
  • Tumor size is a significant factor influencing contralateral ABR abnormalities, likely due to brainstem compression.
  • Findings have implications for interpreting ABR in the context of acoustic neuromas and potential brainstem involvement.