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Small fibre function in primary autonomic failure

R Baron1, R Feldmann, V Lindner

  • 1Klinik für Neurologie, Christian-Albrechts-Universität Kiel, Germany.

Journal of Neurology
|December 1, 1993
PubMed
Summary
This summary is machine-generated.

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Primary autonomic failure (AF) significantly impairs sympathetic C-fibres but preserves afferent C-fibres. New neurophysiological methods aid early diagnosis of AF and differentiate it from other autonomic neuropathies.

Area of Science:

  • Neurology
  • Autonomic Neuroscience
  • Clinical Neurophysiology

Background:

  • Primary autonomic failure (AF) is a neurodegenerative disorder affecting the autonomic nervous system.
  • Distinguishing primary AF from secondary autonomic neuropathies is crucial for accurate diagnosis and management.
  • Unmyelinated C-fibres play a vital role in autonomic and sensory functions.

Observation:

  • A case study of primary AF with uncomplicated Parkinson's disease is presented.
  • New quantitative neurophysiological methods were employed to assess unmyelinated sympathetic and afferent C-fibre function.
  • Sympathetic vasoconstrictor responses and C-fibre axon reflex vasodilatation were measured.

Findings:

  • Sympathetic vasoconstrictor responses were markedly depressed in primary AF, similar to secondary forms.

Related Experiment Videos

  • Peripheral nociceptive C-fibre function, assessed by axon reflex vasodilatation, was intact in primary AF.
  • These findings suggest sympathetic C-fibres are affected, while afferent C-fibres remain preserved in primary AF.

    • Implications:

    • Modern neurophysiological techniques can help diagnose and differentiate primary AF in early stages.
    • These methods may distinguish primary AF from secondary autonomic neuropathies involving unmyelinated afferent fibres.
    • This research contributes to a better understanding of small fibre dysfunction in autonomic disorders.