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Brain stem dysfunction in spasmodic torticollis : an electrophysiological study.

S N Dixit1, M Behari1

  • 1Department of Neurology, All Institute of Medical Sciences, New Delhi - 110 029, India.

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Summary
This summary is machine-generated.

Spasmodic torticollis (ST) may affect the blink reflex. Patients with ST showed a prolonged R2 response ipsilateral to the head deviation, suggesting potential brainstem dysfunction.

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Area of Science:

  • Neurology
  • Neurophysiology

Background:

  • Spasmodic torticollis (ST) is characterized by abnormal head posture.
  • Head deviation in ST can potentially impact neurological functions like blink reflex and brainstem auditory evoked potentials (BAEP).

Purpose of the Study:

  • To investigate potential neurological abnormalities in patients with spasmodic torticollis.
  • To compare blink reflex and BAEP in ST patients versus healthy controls.

Main Methods:

  • Studied 10 patients with spasmodic torticollis and 10 age/sex-matched healthy controls.
  • Assessed brainstem auditory evoked potentials (BAEP).
  • Evaluated blink reflex components (R1, R2 ipsilateral, R2 contralateral).

Main Results:

  • No significant differences were observed in BAEP between ST patients and controls.
  • R1 and contralateral R2 blink reflex components were similar in both groups.
  • A prolonged R2 response ipsilateral to the head deviation was found in ST patients compared to controls (p<0.05).

Conclusions:

  • Brainstem auditory evoked potentials (BAEP) do not appear to be consistently affected in spasmodic torticollis.
  • Specific abnormalities in the blink reflex, particularly the ipsilateral R2 response, suggest localized brainstem dysfunction in some ST patients.