Correlation Between Hyperthyroidism, Hypothyroidism With Blood Pressure

Thyroid hormones play a vital role in various physiological systems within the body, particularly impacting cardiovascular functions. There is a signicant link between thyroid dysfunction and higher mortality rates or the prevalence of cardiovascular diseases; any deviation from a normal thyroid state (euthyroid status) can disrupt typical physiological processes. Notably, thyroid disorders have a more pronounced effect on blood pressure (BP), yet this connection is often under-acknowledged. This ambiguity is highlighted by the mixed ndings in research; for instance, colleagues observed a direct correlation between serum Thyroid Stimulating Hormone (TSH) levels and both systolic and diastolic BP. However, other studies did not nd similar associations. In understanding BP regulation, it is essential to consider cardiac output (CO) and systemic vascular resistance (SVR), as BP is determined by the CO x SVR formula. Thyroid hormones are crucial in regulating heart rate, cardiac contractility, and blood volume, thereby signicantly inuencing BP. Additionally, these hormones affect BP via the renin-angiotensin-aldosterone system (RAAS), with hyperthyroidism and hypothyroidism producing opposite effects. Thyroid diseases can also lead to endothelial dysfunction by diminishing brinolytic activity and nitric oxide synthesis. At the molecular level, thyroid hormones signicantly inuence gene expression in cardiac myocytes. Moreover, hypothyroidism is often associated with components of metabolic syndrome, including hyperlipidemia, diabetes, and obesity