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Related Experiment Videos

Heart in thyroid diseases.

J Král1, J Hradec, J Limanová

  • 1IIIrd Department of Internal Medicine, Charles University 1st School of Medicine, Prague, Czechoslovakia.

Cor Et Vasa
|January 1, 1992
PubMed
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Thyroid dysfunction significantly impacts cardiovascular function, altering heart dynamics. Treatment normalizing thyroid hormone levels reverses these cardiac changes, highlighting the importance of timely intervention.

Area of Science:

  • Cardiology
  • Endocrinology
  • Pathophysiology

Background:

  • Thyroid hormones play a crucial role in regulating cardiovascular function.
  • Both hyperthyroidism and hypothyroidism can lead to significant cardiovascular alterations.
  • Understanding these pathophysiologic mechanisms is vital for effective patient management.

Purpose of the Study:

  • To investigate the pathophysiologic mechanisms of cardiovascular changes in thyroid dysfunction.
  • To compare hemodynamic alterations in hyperthyroidism versus hypothyroidism.
  • To document the reversibility of these changes with appropriate therapy.

Main Methods:

  • Echocardiography was used to assess hemodynamic parameters.
  • 12 patients with hyperthyroidism and 19 with myxedema were studied.

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  • Measurements were taken before and after therapeutic intervention.

    • Main Results:

    • Hyperthyroidism showed increased left ventricular end-diastolic volume, stroke volume (SV), and cardiac index (CI).
    • Hypothyroidism was associated with decreased SV and CI, and reduced mean velocity of circumferential fiber shortening (mVCF).
    • Left ventricular myocardial weight tended to increase in hyperthyroidism.

    Conclusions:

    • Thyroid dysfunction profoundly affects cardiac hemodynamics.
    • Cardiovascular changes are distinct in hyperthyroidism and hypothyroidism.
    • Normalizing thyroid function leads to full reversibility of observed hemodynamic alterations.