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Thyroid disease and the heart.

Irwin Klein1, Sara Danzi

  • 1Department of Medicine and the Feinstein Institute for Medical Research, North Shore University Hospital, 350 Community Dr, Manhasset, NY 11030, USA. iklein@nshs.edu

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Thyroid disease significantly impacts cardiovascular health, causing changes in heart function and blood pressure. Restoring normal thyroid levels often reverses these harmful effects.

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Area of Science:

  • Cardiology
  • Endocrinology
  • Thyroidology

Background:

  • Thyroid dysfunction, including hyperthyroidism and hypothyroidism, profoundly affects cardiovascular function.
  • Understanding cellular mechanisms of thyroid hormone action explains cardiovascular changes like altered cardiac output, contractility, blood pressure, vascular resistance, and arrhythmias.
  • Recognizing thyroid disease's cardiac effects is crucial as normalizing thyroid function typically reverses hemodynamic abnormalities.

Purpose of the Study:

  • To review the cardiovascular manifestations of thyroid disease.
  • To discuss diagnostic thyroid function tests and treatment for achieving a euthyroid state.
  • To examine thyroid hormone metabolism in heart failure and amiodarone-induced thyroid dysfunction.

Main Methods:

  • Literature review focusing on cellular mechanisms, clinical findings, diagnostic tests, and treatment of thyroid disease-related cardiovascular issues.
  • Analysis of thyroid hormone metabolism in chronic heart failure.
  • Review of management strategies for amiodarone-induced thyroid dysfunction.

Main Results:

  • Thyroid dysfunction leads to significant cardiovascular changes, including altered cardiac output, contractility, blood pressure, and heart rhythm.
  • Appropriate thyroid function tests aid in diagnosis, and treatment to restore euthyroid status reverses cardiovascular abnormalities.
  • Chronic heart failure alters thyroid hormone metabolism, and amiodarone use can induce thyroid function test abnormalities requiring specific management.

Conclusions:

  • Cardiovascular effects of thyroid disease are significant and reversible with proper treatment.
  • Accurate diagnosis through thyroid function tests and achieving a euthyroid state are key to managing these conditions.
  • Special considerations are needed for thyroid dysfunction in heart failure and amiodarone use.