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Disopyramide anticholinergic action.

A J Byrne, T E Healy, V Mahmoodi

    Acta Anaesthesiologica Scandinavica
    |June 1, 1981
    PubMed
    Summary
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    Disopyramide inhibits cholinergic transmission by reducing responses to carbachol in muscle preparations. It also causes dose-dependent ganglionic blockade in nerve-muscle systems.

    Area of Science:

    • Pharmacology
    • Neuroscience
    • Physiology

    Background:

    • Cholinergic transmission is crucial for neuromuscular function.
    • Disopyramide is an antiarrhythmic drug with potential effects on neurotransmission.

    Purpose of the Study:

    • To investigate the effects of disopyramide on cholinergic transmission.
    • To determine if disopyramide impacts neuromuscular or ganglionic transmission.

    Main Methods:

    • Experiments utilized isolated frog abdominis rectus and guinea pig vas deferens hypogastric nerve preparations.
    • Responses to carbachol and potassium chloride were measured in the presence of varying disopyramide concentrations.

    Main Results:

    • Disopyramide reduced carbachol-induced responses in the frog abdominis rectus preparation.

    Related Experiment Videos

  • Disopyramide caused a concentration-dependent blockade of ganglionic transmission in the guinea pig preparation.
  • Responses to potassium chloride were unaffected, suggesting a specific effect on cholinergic receptors or transmission.

    • Conclusions:

    • Disopyramide interferes with cholinergic neurotransmission at both the neuromuscular junction and ganglionic synapses.
    • The drug exhibits dose-dependent inhibitory effects on cholinergic pathways.