The impact of thyroid hormone dysfunction on ischemic heart disease

Area of Science:

• Cardiology
• Endocrinology
• Molecular Medicine

Background:

• Thyroid hormones are vital for cardiovascular homeostasis, influencing myocardial relaxation, contraction, angiogenesis, and extracellular matrix.
• Thyroid axis dysfunction impairs myocardial energy status and endothelial function, leading to reduced nitric oxide-mediated vascular relaxation.
• Both overt and subclinical hypothyroidism are linked to increased coronary events and heart failure progression.

Purpose of the Study:

• To review the pathophysiological and clinical connections between thyroid dysfunction and ischemic heart disease.
• To highlight thyroid hormone abnormalities as a critical factor in cardiovascular health.
• To explore the therapeutic potential of thyroid hormone supplementation in ischemic heart disease.

Main Methods:

• Focused review of existing literature on thyroid function and ischemic heart disease.
• Analysis of the role of thyroid hormones in myocardial structure, function, and geometry post-myocardial infarction.
• Examination of local cardiac hypothyroidism due to type 3 deiodinase upregulation in ischemic conditions.

Main Results:

• Thyroid hormone dysfunction is common in heart disease, especially ischemic heart disease, and constitutes a cardiovascular risk factor.
• Low thyroid hormone levels are associated with impaired endothelial function and increased risk of adverse cardiovascular events.
• Local cardiac hypothyroidism can occur in ischemic heart disease, exacerbating the condition.

Conclusions:

• Altered thyroid function is a significant factor in the pathophysiology and clinical presentation of ischemic heart disease.
• Thyroid hormone supplementation may offer therapeutic benefits for patients with ischemic heart disease.
• Recognizing and managing thyroid abnormalities is crucial for cardiovascular risk stratification and treatment.