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Auditory brain-stem responses in blepharospasm

D J Creel1, J B Holds, R L Anderson

  • 1VA Medical Center, Salt Lake City, UT 84148.

Electroencephalography and Clinical Neurophysiology
|February 1, 1993
PubMed
Summary
This summary is machine-generated.

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Auditory brain-stem response (ABR) tests revealed abnormalities in 30% of patients with blepharospasm. These findings suggest potential brain-stem issues in individuals with this cranial-cervical dystonia.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Audiology

Background:

  • Auditory brain-stem response (ABR) is a diagnostic tool for auditory pathway and adjacent structure abnormalities.
  • Blepharospasm is a form of cranial-cervical dystonia characterized by involuntary eyelid closure.

Purpose of the Study:

  • To investigate the utility of ABR in detecting neurological abnormalities in patients with blepharospasm.
  • To determine the prevalence of abnormal ABR findings in individuals diagnosed with essential blepharospasm.

Main Methods:

  • A cohort of 35 consecutive patients with blepharospasm underwent ABR testing.
  • ABR results were analyzed for abnormalities, focusing on waveform morphology and peak latencies (components III and V).

Main Results:

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  • Ten out of 35 patients (approximately 28.6%) exhibited abnormal ABRs.
  • Abnormalities included poor waveform form and delayed peak latencies of positive components III or V.
  • These findings suggest a significant incidence of brain-stem dysfunction in patients with essential blepharospasm.

Conclusions:

  • Abnormal ABRs are present in a substantial proportion of patients with essential blepharospasm.
  • These results indicate potential brain-stem pathology associated with this condition.
  • ABR may serve as a valuable non-invasive tool for assessing neurological involvement in blepharospasm.