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Related Experiment Videos

Adrenergic innervation in autonomic failure

R Bannister, R Crowe, R Eames

    Neurology
    |December 1, 1981
    PubMed
    Summary

    Patients with chronic autonomic failure show a severe lack of catecholamine fluorescence in sympathetic nerves. This indicates a significant depletion of noradrenergic vesicles, crucial for nerve function.

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    Area of Science:

    • Neurology
    • Autonomic Nervous System Research
    • Histopathology

    Background:

    • Chronic autonomic failure encompasses conditions affecting the autonomic nervous system.
    • Sympathetic nerve dysfunction is a key feature in these disorders.
    • Understanding the specific nerve pathology is crucial for diagnosis and treatment.

    Purpose of the Study:

    • To investigate the state of sympathetic perivascular nerve plexuses in patients with chronic autonomic failure.
    • To examine the catecholamine content and vesicle morphology in these nerves.
    • To differentiate pathological findings between subtypes of autonomic failure.

    Main Methods:

    • Biopsies of quadriceps muscle sympathetic nerve plexuses were obtained from 10 patients.
    • Techniques used included catecholamine fluorescence and electron microscopy.
    • Analysis focused on catecholamine presence and the number of small granular vesicles.

    Main Results:

    • A near-complete absence of catecholamine fluorescence was observed in all studied nerves.
    • Fewer than normal numbers of small granular (noradrenergic) vesicles were found.
    • The most significant depletion was noted in patients with pure autonomic failure.

    Conclusions:

    • Chronic autonomic failure is associated with severe depletion of noradrenergic vesicles in sympathetic nerves.
    • Findings suggest a significant impairment of sympathetic neurotransmission.
    • Further quantitative studies are needed to compare pure autonomic failure and multiple system atrophy (Shy-Drager syndrome).

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