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Related Experiment Videos

Changes in plasma catecholamines after tonic-clonic seizures.

R P Simon, M J Aminoff, N L Benowitz

    Neurology
    |February 1, 1984
    PubMed
    Summary

    Following a seizure, levels of stress hormones like epinephrine and norepinephrine surge in the blood. These changes in catecholamines are linked to sympathetic nervous system and adrenal activation, impacting cardiovascular and metabolic functions.

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    Area of Science:

    • Neuroscience
    • Endocrinology
    • Cardiovascular Physiology

    Background:

    • Circulating catecholamines, including epinephrine and norepinephrine, are known to increase following induced seizures in animal models and electroconvulsive therapy in humans.
    • These neurochemicals play critical roles in the body's stress response, influencing cardiovascular and metabolic functions.

    Purpose of the Study:

    • To investigate the changes in plasma concentrations of epinephrine and norepinephrine after a single, spontaneous tonic-clonic convulsion in human patients.
    • To quantify the magnitude of these catecholamine responses in a clinical setting.

    Main Methods:

    • Blood samples were collected from 17 patients following a spontaneous tonic-clonic seizure.
    • Plasma concentrations of epinephrine and norepinephrine were measured at specific time points post-seizure.

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    Main Results:

    • Plasma levels of both epinephrine and norepinephrine showed a sharp increase within 30 minutes after the seizure.
    • These elevated levels then rapidly declined.
    • The observed norepinephrine increase was sufficient to cause vasoconstriction, suggesting sympathetic neural activation.
    • The epinephrine increase indicated significant adrenal activation with potential cardiovascular and metabolic effects.

    Conclusions:

    • Spontaneous tonic-clonic seizures trigger significant, rapid, and transient elevations in circulating epinephrine and norepinephrine in humans.
    • These hormonal responses are indicative of generalized sympathetic nervous system and adrenal medulla activation.
    • The magnitude of these catecholamine changes suggests they can have substantial physiological consequences, including direct effects on blood vessels and broader cardiovascular and metabolic impacts.