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Related Experiment Videos

Plasma and urinary digoxin in thyroid dysfunction.

G M Shenfield, J Thompson, D B Horn

    European Journal of Clinical Pharmacology
    |December 28, 1977
    PubMed
    Summary
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    Thyroid dysfunction affects how the body processes digoxin. Hyperthyroid patients had lower plasma digoxin levels, while hypothyroid patients had similar or lower levels after treatment.

    Area of Science:

    • Pharmacology
    • Endocrinology
    • Clinical Medicine

    Background:

    • Thyroid hormones significantly influence drug metabolism and disposition.
    • Digoxin pharmacokinetics can be altered in patients with thyroid dysfunction.

    Purpose of the Study:

    • To investigate the impact of hyperthyroidism and hypothyroidism on the pharmacokinetics of digoxin.
    • To determine appropriate digoxin dosing strategies in patients with thyroid dysfunction.

    Main Methods:

    • Studied eight patients (four hyperthyroid, four hypothyroid) before and after thyroid treatment.
    • Measured plasma and urinary digoxin levels after a single oral dose.
    • Performed pharmacokinetic analysis using a two-compartment model.

    Main Results:

    Related Experiment Videos

    • Plasma digoxin levels were significantly lower in thyrotoxic patients compared to euthyroid states.
    • Hypothyroid patients showed no significant increase in plasma digoxin levels post-treatment.
    • Creatinine clearance correlated with urinary digoxin, both changing with thyroid status.

    Conclusions:

    • Thyroid status markedly affects digoxin pharmacokinetics, particularly distribution.
    • Plasma digoxin levels should be closely monitored in patients with thyroid dysfunction receiving digoxin therapy.