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Hypothyroidism II: Pathophysiology01:23

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Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...
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Hypertension is asymptomatic and also referred to as the "silent killer" until it progresses to a severe stage or causes target organ disease. Patients may experience symptoms stemming from the strain on blood vessels and tissues in various organs or the heart's increased workload.Physical exams might show no abnormalities other than high blood pressure. Signs of vascular damage, when present, correspond to the organs supplied by the affected vessels, leading to target organ damage. For...
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Hypertension is a chronic condition in which the blood's force against artery walls is excessively high, posing risks such as heart disease. The condition's underlying mechanisms involve complex interactions among the cardiovascular, kidney, and autonomic nervous systems.Renin-Angiotensin-Aldosterone System (RAAS): This system significantly influences blood pressure regulation. When blood pressure decreases, the kidneys secrete renin. This enzyme transforms angiotensinogen, a plasma protein,...
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Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH...
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Atherosclerosis is a progressive disorder that leads to the thickening and narrowing of arterial walls due to plaque buildup. This condition can cause various symptoms depending on the arteries affected:Coronary Artery Disease (CAD): This condition affects the coronary arteries and may lead to chest pain (angina), shortness of breath (dyspnea), heart attacks, and other heart disease symptoms.Cerebrovascular Disease: This affects blood flow to the brain, causing transient ischemic attacks (TIAs)...
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The key clinical manifestations of Rheumatic heart disease (RHD) include several distinct cardiac symptoms.Carditis, a hallmark of acute rheumatic fever, involves inflammation of the heart's endocardium, myocardium, and pericardium. Chronic RHD often results from recurrent episodes of carditis. Its symptoms include the following:Murmurs are caused by valvular damage, especially to the mitral and aortic valves. Mitral stenosis or regurgitation is common, with characteristic heart murmurs...
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Elevated arterial stiffness and diastolic dysfunction in subclinical hypothyroidism.

Mitsuru Masaki1, Kazuo Komamura, Akiko Goda

  • 1Cardiovascular Division, Department of Internal Medicine, Hyogo College of Medicine.

Circulation Journal : Official Journal of the Japanese Circulation Society
|April 4, 2014
PubMed
Summary

Subclinical hypothyroidism is linked to increased arterial stiffness and impaired heart function. Higher NT-proBNP levels correlate with raised cardio-ankle vascular index (CAVI) in these patients.

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Area of Science:

  • Cardiology
  • Endocrinology
  • Vascular Medicine

Background:

  • Thyroid hormone influences arterial stiffness and left ventricular diastolic function.
  • The specific relationship in subclinical hypothyroidism remains unclear.

Purpose of the Study:

  • To investigate the association between thyroid hormone levels, cardio-ankle vascular index (CAVI), and left ventricular diastolic function in subclinical hypothyroidism.

Main Methods:

  • Cross-sectional study comparing 83 untreated subclinical hypothyroidism patients with 83 controls.
  • Measured log NT-proBNP, CRP, arterial stiffness (CAVI), and early diastolic mitral annular velocity (E').

Main Results:

  • Subclinical hypothyroidism patients showed higher logNT-proBNP, CRP, and CAVI, and lower E' compared to controls.
  • CAVI was significantly associated with logNT-proBNP, CRP, and E' in the subclinical hypothyroidism group.

Conclusions:

  • Elevated NT-proBNP is associated with increased CAVI in subclinical hypothyroidism.
  • Subclinical hypothyroidism may increase cardiovascular event risk due to arterial stiffening and diastolic dysfunction.