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Sympathetic iris function in amyotrophic lateral sclerosis.

A Bogucki, R Salvesen

    Journal of Neurology
    |April 1, 1987
    PubMed
    Summary
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    This study investigated autonomic fibre function in amyotrophic lateral sclerosis (ALS). Results suggest sympathetic functions are not involved in ALS, as patients showed normal pupillary responses to sympathomimetic agents.

    Area of Science:

    • Neurology
    • Autonomic Nervous System Research
    • Neurodegenerative Diseases

    Background:

    • Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease.
    • Autonomic fibres are typically considered unaffected in ALS.
    • Some anatomical studies challenge the notion of autonomic fibre sparing in ALS.

    Purpose of the Study:

    • To investigate pupillary responses to sympathomimetic agents in ALS patients.
    • To evaluate the involvement of sympathetic functions in amyotrophic lateral sclerosis.
    • To test the hypothesis that autonomic fibres are spared in ALS.

    Main Methods:

    • Assessed pupillary responses to tyramine (norepinephrine releaser) and phenylephrine (sympathomimetic) in 11 ALS patients and matched controls.
    • Compared the sensitivity of patients and controls to these agents.

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    Main Results:

    • Patients with ALS and control subjects exhibited similar sensitivity to sympathomimetic agents.
    • No significant difference in pupillary response was observed between the groups.

    Conclusions:

    • The findings support the hypothesis that sympathetic functions are not involved in the pathophysiology of ALS.
    • Autonomic fibres, specifically sympathetic functions tested via pupillary response, appear to be spared in amyotrophic lateral sclerosis.
    • Further research may explore other aspects of autonomic function in ALS.