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Echocardiogram before and after subtotal thyroidectomy for hyperthyroidism

K Otsuka, T Yanaga, S Kudo

    Japanese Heart Journal
    |January 1, 1977
    PubMed
    Summary
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    Subtotal thyroidectomy in hyperthyroidism patients significantly improves myocardial contractility and ventricular filling rates, as shown by echocardiography. Post-operative assessments confirm reduced thyroid function and enhanced cardiac performance.

    Area of Science:

    • Cardiology
    • Endocrinology
    • Medical Imaging

    Background:

    • Hyperthyroidism is associated with enhanced myocardial contractility and elevated ventricular filling rates.
    • Assessing cardiac function in hyperthyroid patients is crucial for understanding disease impact and treatment efficacy.

    Purpose of the Study:

    • To evaluate the impact of subtotal thyroidectomy on myocardial contractility in hyperthyroid patients.
    • To assess the utility of echocardiography in monitoring cardiac function post-thyroidectomy.

    Main Methods:

    • Echocardiography was used to measure myocardial contractility parameters in 27 hyperthyroid patients before and after subtotal thyroidectomy.
    • Thyroid function tests (PBI, T3, T4) were performed to confirm biochemical changes post-operation.

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    Main Results:

    • Subtotal thyroidectomy led to significant decreases in thyroid function (PBI, T3, T4).
    • Mean AWVs, PWVs, and DDR decreased significantly post-operation, correlating with reduced T3 levels.
    • Echocardiographic measures of myocardial contractility and ventricular filling were suppressed after surgery.

    Conclusions:

    • Subtotal thyroidectomy effectively suppresses the enhanced myocardial contractility and elevated ventricular filling rates characteristic of hyperthyroidism.
    • Echocardiography serves as a valuable tool for evaluating the clinical course and cardiac status following thyroidectomy in hyperthyroid patients.