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Startle responses in hereditary hyperekplexia

M A Tijssen1, L M Voorkamp, G W Padberg

  • 1Department of Neurology and Clinical Neurophysiology, Leiden University Hospital, the Netherlands.

Archives of Neurology
|April 1, 1997
PubMed
Summary
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Hereditary hyperekplexia patients exhibit exaggerated startle reflexes and autonomic responses. These findings in the Dutch pedigree highlight differences in motor responses and habituation compared to controls.

Area of Science:

  • Neuroscience
  • Genetics
  • Clinical Physiology

Background:

  • Hereditary hyperekplexia is characterized by exaggerated startle responses and stiffness.
  • A specific gene mutation affecting the glycine receptor alpha 1 subunit is linked to the major form of this condition.

Purpose of the Study:

  • To quantify startle reflexes and autonomic responses in individuals with the major form of hereditary hyperekplexia.
  • To compare these responses in a Dutch family pedigree against healthy controls.

Main Methods:

  • Auditory stimuli (90 and 113 dB) were administered in series to assess startle reflexes and autonomic reactions.
  • Electromyographic activity of multiple muscles, psychogalvanic responses, blood pressure, and heart rate were measured.
  • Nine patients from the Dutch hyperekplexia pedigree and 20 healthy controls participated.

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Main Results:

  • Patients showed significantly more frequent and larger electromyographic bursts, indicating stronger motor startle responses.
  • Without medication, patients displayed shorter latency periods in specific muscles, but overall, responses were more pronounced.
  • The psychogalvanic response amplitude was increased in patients, with weaker habituation observed.

Conclusions:

  • Individuals with hereditary hyperekplexia demonstrate heightened motor startle responses and altered habituation patterns.
  • Excessive startle responses, including psychogalvanic responses, are characteristic of the condition.
  • The study clarifies that increased responses do not automatically imply reduced habituation in hereditary hyperekplexia.