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Related Experiment Videos

Thioridazine and EKG anomalies.

B Hine, L J Traficante, G Sakalis

    Experientia
    |December 15, 1979
    PubMed
    Summary

    Acute intravenous thioridazine hydrochloride in dogs caused EKG anomalies, unlike daily oral doses. Thioridazine-5-sulfoxide did not produce these effects, suggesting a link between thioridazine levels and EKG changes.

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    Area of Science:

    • Pharmacology
    • Cardiology
    • Veterinary Medicine

    Background:

    • Thioridazine hydrochloride is an antipsychotic medication.
    • EKG anomalies have been reported in psychiatric patients taking thioridazine.
    • The specific administration route and metabolites' effects on cardiac function require clarification.

    Purpose of the Study:

    • To investigate the cardiac effects of acute intravenous versus daily oral thioridazine hydrochloride in dogs.
    • To compare the EKG effects of thioridazine and its metabolite, thioridazine-5-sulfoxide.
    • To explore the relationship between drug plasma levels, metabolites, and observed EKG changes.

    Main Methods:

    • Administration of thioridazine hydrochloride via acute i.v. infusion and daily oral dosing in dogs.
    • Administration of thioridazine-5-sulfoxide via i.v. infusion.
    • Electrocardiogram (EKG) monitoring to assess cardiac anomalies.
    • Dose-equivalent comparisons between thioridazine and its metabolite.

    Main Results:

    • Acute i.v. infusion of thioridazine-HCl induced EKG anomalies in dogs.
    • Daily oral administration of thioridazine-HCl did not produce similar EKG anomalies.
    • Infusion of thioridazine-5-sulfoxide at equivalent doses did not result in EKG anomalies.

    Conclusions:

    • The route of administration (acute i.v. vs. daily oral) significantly influences the cardiac effects of thioridazine hydrochloride.
    • Thioridazine-5-sulfoxide does not appear to be responsible for the observed EKG anomalies.
    • Further research is needed to elucidate the correlation between thioridazine plasma concentrations, its sulfoxide metabolite, and EKG alterations.

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