Novel uses of thyroid hormones in cardiovascular conditions

Area of Science:

• Cardiology
• Endocrinology
• Translational Medicine

Background:

• Cardiovascular diseases (CVDs) are associated with reduced thyroid hormone levels, correlating with worse patient outcomes.
• The precise role of altered thyroid hormone bioavailability in myocardial conditions remains unclear, with potential for both beneficial and maladaptive responses.

Purpose of the Study:

• To evaluate the current evidence on thyroid hormone levels and treatment in cardiovascular diseases, including acute myocardial infarction (AMI), heart failure, cardiac surgery, and transplantation.
• To identify knowledge gaps and the need for further clinical trials to establish the safety and efficacy of thyroid hormone therapy in cardiac patients.

Main Methods:

• Review of experimental studies in animal models of AMI suggesting potential benefits of thyroid hormone treatment.
• Analysis of limited clinical data regarding thyroid hormone use in patients with AMI, heart failure, and those undergoing cardiac procedures.

Main Results:

• Experimental data suggests thyroid hormone treatment may be beneficial in acute myocardial infarction.
• Clinical data is scarce, indicating potential safety and efficacy for normalizing thyroid hormone levels in AMI and heart failure, but requires further investigation.
• Evidence for thyroid hormone therapy in cardiac surgery and transplantation is limited, precluding firm conclusions on risks and benefits.

Conclusions:

• Current evidence is insufficient to establish the benefits or risks of thyroid hormone therapy in cardiovascular diseases.
• Large-scale clinical trials are essential to confirm safety and efficacy, and to determine optimal treatment parameters (hormone type, timing, dose, and outcome measures).
• Thyroid hormone therapy in cardiovascular diseases should currently be confined to research settings.