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Related Experiment Videos

Ocular counterrolling abnormalities in spasmodic torticollis.

S G Diamond1, C H Markham, R W Baloh

  • 1Department of Neurology, UCLA School of Medicine 90024-1769.

Archives of Neurology
|February 1, 1988
PubMed
Summary

Spasmodic torticollis patients exhibit abnormal ocular counterrolling, indicating vestibular system dysfunction. This suggests central vestibular connections and brain-stem pathway disruptions contribute to this movement disorder.

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Area of Science:

  • Neurology
  • Ophthalmology
  • Vestibular Science

Background:

  • Spasmodic torticollis is a focal dystonic movement disorder with unknown etiology.
  • Vestibular involvement has been long hypothesized in spasmodic torticollis.

Purpose of the Study:

  • To investigate otolith function, specifically ocular counterrolling, in patients with spasmodic torticollis.
  • To determine if vestibular system abnormalities correlate with spasmodic torticollis.

Main Methods:

  • Eight patients with spasmodic torticollis underwent ocular counterrolling tests.
  • Eye torsion was measured using photography during head rotation (naso-occipital and earth-horizontal axes).
  • Measurements were accurate to 0.1 degrees using a superimposition technique.

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Main Results:

  • All eight patients displayed abnormal ocular counterrolling.
  • A significant defect was the lack of sustained eye torsion at extreme head tilts.
  • Patients exhibited eye rolling towards head tilt instead of counterrolling.
  • Most patients showed spontaneous vestibular nystagmus and directional preponderance with caloric stimulation.

Conclusions:

  • Findings suggest central vestibular connection dysfunction in spasmodic torticollis.
  • Disruption of brain-stem pathways is implicated in the disorder's pathophysiology.
  • Ocular counterrolling abnormalities provide evidence for vestibular system involvement.