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Propranolol dosage in thyrotoxicosis

J Feely, A Forrest, A Gunn

    The Journal of Clinical Endocrinology and Metabolism
    |September 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

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    Plasma propranolol levels vary significantly in thyrotoxic patients, impacting beta-adrenergic blockade. Higher doses may be needed for effective treatment, especially in younger or severely thyrotoxic individuals.

    Area of Science:

    • Pharmacology
    • Endocrinology

    Background:

    • Thyrotoxicosis often requires beta-adrenergic blockade for symptom management.
    • Propranolol is a commonly used beta-blocker for thyrotoxicosis.

    Purpose of the Study:

    • To investigate the relationship between plasma propranolol concentration and its therapeutic effects in thyrotoxic patients.
    • To assess the variability in propranolol dosage and its efficacy.

    Main Methods:

    • Studied 18 thyrotoxic patients on chronic propranolol treatment (160 mg/day).
    • Measured plasma propranolol concentrations and assessed beta-adrenergic blockade.
    • Analyzed correlation between plasma levels, blockade, weight change, and subjective improvement.
    • Evaluated propranolol dosage titration in 40 patients to achieve >25% exercise heart rate reduction.

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    Main Results:

    • Significant interindividual variability observed in plasma propranolol levels and beta-adrenergic blockade.
    • Plasma propranolol concentration correlated with beta-adrenergic blockade and weight change.
    • No correlation found between plasma propranolol levels and subjective improvement.
    • No thyroid storm cases in patients with objectively titrated propranolol dosage.

    Conclusions:

    • Individualized propranolol dosing is crucial for effective thyrotoxicosis management.
    • Higher doses than 160 mg/day may be necessary for adequate beta-adrenergic blockade in certain patients.
    • Objective titration of propranolol dosage can prevent thyroid storm preoperatively.