Related Experiment Video
Updated: May 24, 2026
07:09
Experimental and Imaging Techniques for Examining Fibrin Clot Structures in Normal and Diseased States
Published on: April 1, 2015
Thyroid dysfunction and fibrin network structure: a mechanism for increased thrombotic risk in hyperthyroid
J M W Hooper1, D J F Stuijver, S M Orme
1Division of Cardiovascular and Diabetes Research, Multidisciplinary Cardiovascular Research Centre, University of Leeds, Leeds LS2 9JT, United Kingdom.
The Journal of Clinical Endocrinology and Metabolism
|March 2, 2012
Summary
Hyperthyroidism leads to more compact blood clots that resist breakdown, increasing thrombosis risk. Normalizing thyroid function improves clot structure and lysis, suggesting a key mechanism for reduced clotting.
Area of Science:
- Hematology
- Endocrinology
- Thrombosis Research
Background:
- Hyperthyroidism is linked to a higher risk of thrombosis.
- Fibrin clot structure is a critical determinant of thrombotic event susceptibility.
Purpose of the Study:
- To investigate fibrin clot formation and lysis in hyperthyroidism.
- To assess the impact of normalizing thyroid function on clot parameters.
Main Methods:
- Ex vivo analysis of fibrin clot structure and fibrinolysis in hyperthyroid patients and controls.
- Measurement of plasma thrombotic and inflammatory markers.
- Confocal and electron microscopy to visualize clot morphology.
Main Results:
- Hyperthyroid subjects exhibited denser clots with slower lysis times, correlated with free T4 levels.
- Elevated plasma levels of fibrinogen, plasminogen activator inhibitor-1, and complement C3 were observed.
- Normalization of thyroid function reversed these clot alterations and reduced marker levels.
Conclusions:
- Endogenous hyperthyroidism is associated with more compact clots and impaired fibrinolysis.
- These changes are linked to hyperthyroid severity and C3 levels, and are reversible with euthyroidism.
- Altered clot structure and lysis represent a potential mechanism for increased thrombotic risk in hyperthyroidism.
Related Concept Videos
01:27Hyperthyroidism II: Pathophysiology
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 receptors...
01:24Graves Disease II: Pathophysiology
Graves’ disease is an autoimmune disorder characterized by the production of thyroid-stimulating immunoglobulins (TSI) that activate TSH receptors, leading to excessive synthesis and release of thyroid hormones (T3 and T4) and resulting in hyperthyroidism.Among all causes of hyperthyroidism, Graves’ disease is the most common and can happen at any age, though it is more frequent in women. It produces a hypermetabolic state with features such as weight loss, tachycardia, tremor, and heat...
01:25Hyperthyroidism I: Introduction
Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...
01:23Hypothyroidism II: Pathophysiology
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...
01:30Anticoagulant Drugs: Low-Molecular-Weight Heparins
Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
01:20Synthesis and Regulation of Thyroid Hormones
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.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The iodine is then...
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The iodine is then...