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Related Experiment Videos

Brain-stem auditory-evoked potentials in spasmodic torticollis.

M E Drake1

  • 1Department of Neurology, Ohio State University College of Medicine, Columbus 43210.

Archives of Neurology
|February 1, 1988
PubMed
Summary

Idiopathic spasmodic torticollis may involve brain-stem dysfunction. This study found prolonged brain-stem auditory-evoked potential latencies ipsilateral to head deviation in some patients, suggesting a link between brain-stem abnormalities and torticollis.

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Area of Science:

  • Neurology
  • Neurophysiology

Background:

  • The exact cause of idiopathic spasmodic torticollis remains unclear, with potential links to lesions in the brainstem and other central nervous system structures.
  • Previous research on evoked-potential abnormalities in torticollis patients has yielded conflicting results.

Purpose of the Study:

  • To investigate potential brain-stem dysfunction in patients with idiopathic spasmodic torticollis using brain-stem auditory-evoked potentials (BAEPs).

Main Methods:

  • BAEPs were recorded in six patients with torticollis and age-matched controls using rarefaction clicks.
  • Interpeak latencies (IPLs) and absolute latencies were analyzed, comparing values ipsilateral and contralateral to the head deviation.
  • Statistical comparison was performed using Student's t test.

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Main Results:

  • One patient exhibited interpeak latencies (I-III and I-V) outside the normal range.
  • Mean I-III and I-V interpeak latencies were significantly longer ipsilateral to the torticollis compared to controls.
  • No significant differences were found in contralateral IPLs, absolute latencies, or V/I amplitude ratios.

Conclusions:

  • The findings suggest brain-stem dysfunction ipsilateral to the head deviation in some idiopathic spasmodic torticollis patients.
  • These results align with clinical observations and experimental data implicating brain-stem lesions in torticollis development.