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Electrocardiographic voltage changes during hyperthyroidism.

T C Wong, D C Barzilai, R E Smith

    Mayo Clinic Proceedings
    |December 1, 1979
    PubMed
    Summary
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    Thyrotoxicosis (overactive thyroid) significantly decreases electrocardiogram (ECG) voltages, including those indicating left ventricular hypertrophy. Thyroid hormone levels impact cardiac voltage, affecting ECG readings in hyperthyroid and hypothyroid states.

    Area of Science:

    • Cardiology
    • Endocrinology
    • Medical Diagnostics

    Background:

    • Thyroid hormones influence cardiac function and electrophysiology.
    • Previous research suggests a link between thyroid status and cardiac voltage.
    • Hyperthyroidism can lead to cardiac changes, but specific ECG voltage alterations require further elucidation.

    Purpose of the Study:

    • To analyze electrocardiogram (ECG) voltage changes in patients with thyrotoxicosis.
    • To investigate the regression of left ventricular hypertrophy (LVH) criteria upon achieving euthyroidism.
    • To explore the relationship between thyroid hormone levels and cardiac voltage.

    Main Methods:

    • Studied electrocardiograms (ECGs) from 67 thyrotoxic patients.
    • Performed serial ECGs on 16 patients during euthyroidism after radioiodine therapy.

    Related Experiment Videos

  • Analyzed specific ECG voltage parameters and criteria for left ventricular hypertrophy.

    • Main Results:

    • Significant decreases in ECG voltages (P wave, R wave, maximal RS, maximal R) were observed after radioiodine therapy (P < 0.01).
    • Left ventricular hypertrophy criteria, initially present in 21% of patients, regressed in all cases upon achieving euthyroidism.
    • Decreased voltages were noted in nearly all patients, suggesting a direct impact of thyroid status on cardiac electrophysiology.

    Conclusions:

    • Thyrotoxicosis is associated with significant decreases in cardiac voltage on ECG.
    • ECG criteria for left ventricular hypertrophy can regress with normalization of thyroid function.
    • Elevated cardiac voltage in the absence of other causes may indicate hyperthyroidism; conversely, decreased voltage may suggest hypothyroidism.