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Effects of thyroid hormone on the cardiovascular system
Serafino Fazio1, Emiliano A Palmieri, Gaetano Lombardi
1Department of Clinical Medicine and Cardiovascular Sciences, University of Naples "Federico II" School of Medicine, 80131, Naples, Italy.
Recent Progress in Hormone Research
|January 30, 2004
Summary
Thyroid hormone levels significantly impact cardiovascular health, affecting heart rate, function, and arrhythmia risk in both overt and subclinical dysfunction. Early treatment of thyroid imbalances can prevent adverse cardiovascular outcomes.
Area of Science:
- Cardiology
- Endocrinology
- Molecular Biology
Background:
- Thyroid hormone significantly influences cardiovascular function.
- Overt thyroid dysfunction causes distinct cardiovascular changes: hyperthyroidism leads to a hyperdynamic state, while hypothyroidism causes opposite effects.
- The precise mechanisms (contractility vs. loading conditions) driving these changes in overt dysfunction are debated.
Purpose of the Study:
- To explore the cardiovascular effects of subclinical thyroid dysfunction.
- To investigate the role of thyroid hormone metabolism in cardiovascular disease.
- To highlight the potential therapeutic role of thyroid hormone in cardiovascular patients.
Main Methods:
- Review of existing evidence on thyroid hormone's cardiovascular impact.
- Analysis of cardiovascular changes in subclinical hyperthyroidism and hypothyroidism.
- Exploration of altered thyroid hormone metabolism in cardiovascular disease patients.
Main Results:
- Subclinical hyperthyroidism is linked to increased heart rate, arrhythmias, LV mass, impaired relaxation, and mortality risk.
- Subclinical hypothyroidism is associated with diastolic dysfunction, subtle systolic issues, and increased risk of atherosclerosis and myocardial infarction.
- Cardiovascular abnormalities in subclinical thyroid dysfunction are reversible with euthyroid restoration or blunted by treatment.
Conclusions:
- Subclinical thyroid dysfunction presents significant cardiovascular risks.
- Restoration of euthyroidism or specific treatments can reverse these abnormalities.
- Thyroid hormone modulation may offer a novel therapeutic strategy for cardiovascular diseases.