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Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
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The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
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The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
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Hormones, the biochemical messengers produced by endocrine glands, are pivotal in regulating bodily functions and maintaining homeostasis. Each hormone's balance is crucial; imbalances can lead to significant physiological disruptions. Major hormones include oxytocin, cortisol, epinephrine, estrogen, testosterone, thyroxine, growth hormone, insulin, and glucagon.
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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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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
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Euthyroid Sick Syndrome.

Sun Lee1, Alan P Farwell1

  • 1Section of Endocrinology, Diabetes and Nutrition, Department of Medicine, Boston University School of Medicine, Boston Medical Center, Boston, Massachusetts, USA.

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Summary
This summary is machine-generated.

Euthyroid sick syndrome involves complex physiological changes during acute illness. Current treatments with thyroid hormone show no clear benefit for improving patient outcomes.

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Area of Science:

  • Endocrinology
  • Metabolic Disorders
  • Internal Medicine

Background:

  • Euthyroid sick syndrome (ESS), also known as non-thyroidal illness syndrome, is characterized by abnormal thyroid hormone levels during critical illness.
  • It involves complex alterations in thyroid hormone metabolism and action, independent of intrinsic thyroid gland dysfunction.
  • Understanding ESS is crucial for managing critically ill patients.

Purpose of the Study:

  • To review the key characteristics of euthyroid sick syndrome.
  • To explore the underlying pathophysiology and contributing mechanisms.
  • To discuss the therapeutic implications and current treatment strategies.

Main Methods:

  • This review synthesizes existing literature on euthyroid sick syndrome.
  • It examines studies focusing on thyroid hormone deiodinases, hormone transport, and receptor activity.
  • Pathophysiological mechanisms and clinical trial data are analyzed.

Main Results:

  • ESS involves multiple mechanisms, including altered deiodinase activity, thyroid-stimulating hormone secretion, plasma protein binding, and tissue transport of thyroid hormones.
  • It represents a complex interplay of physiological adaptation and pathological response to acute illness.
  • The precise underlying cause remains unclear.

Conclusions:

  • Euthyroid sick syndrome is a multifaceted condition with incompletely understood origins.
  • Therapeutic interventions using thyroid hormone replacement to normalize levels have not demonstrated clear clinical benefits.
  • Further research is needed to elucidate the exact mechanisms and guide effective treatment strategies.