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Related Experiment Videos

Hemodynamic effects of a clonidine-induced decrease in sympathetic tone in patients with cirrhosis.

R Moreau, S S Lee, A Hadengue

    Hepatology (Baltimore, Md.)
    |January 1, 1987
    PubMed
    Summary
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    Clonidine reduced sympathetic nervous system activity, decreasing hyperdynamic circulation and portal hypertension in cirrhosis patients. This suggests sympathetic overactivity contributes to circulatory issues in this condition.

    Area of Science:

    • Cardiology
    • Hepatology
    • Pharmacology

    Background:

    • Cirrhosis often presents with a hyperdynamic circulatory state.
    • Sympathetic nervous system overactivity is implicated in the circulatory derangements of cirrhosis.

    Purpose of the Study:

    • To investigate the effect of clonidine, an alpha 2-agonist, on sympathetic nervous system activity and hemodynamics in cirrhosis patients.
    • To determine if reducing sympathetic activity can alleviate hyperdynamic circulation and portal hypertension.

    Main Methods:

    • 12 patients with cirrhosis and ascites received either clonidine (150 micrograms) or placebo.
    • Plasma noradrenaline, plasma renin activity, systemic, and splanchnic hemodynamics were measured before and after administration.

    Main Results:

    Related Experiment Videos

    • Clonidine significantly decreased plasma noradrenaline levels, indicating reduced sympathetic activity.
    • Statistically significant reductions were observed in cardiac output, mean arterial pressure, hepatic venous pressure gradient, and azygos blood flow.
    • No significant changes in plasma renin activity or hepatic blood flow were noted. No correlation was found between noradrenaline reduction and hemodynamic changes.

    Conclusions:

    • Clonidine's ability to reduce sympathetic nervous system activity and improve hyperdynamic circulation in cirrhosis patients suggests sympathetic overactivity plays a key role.
    • These findings support the potential therapeutic role of targeting sympathetic overactivity in managing circulatory dysfunction associated with cirrhosis.