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Related Concept Videos

Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant 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...
Disorders of Hemostasis01:24

Disorders of Hemostasis

Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.
Venous Thrombosis I: Introduction01:30

Venous Thrombosis I: Introduction

Venous thrombosis, the most common disorder of the veins, involves the formation of a thrombus or blood clot associated with vein inflammation. It can be classified as either superficial vein thrombosis or deep vein thrombosis.Superficial Vein Thrombosis: This involves the formation of a thrombus in a superficial vein, usually the greater or lesser saphenous vein. Though less severe than deep vein thrombosis (DVT), SVT can lead to complications if untreated.Deep Vein Thrombosis (DVT): This...
Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers01:19

Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers

Cardiac biomarkers are critical in diagnosing, prognosing, and managing cardiovascular diseases. Routine measurement of specific biomarkers such as B-type natriuretic peptide (BNP), C-reactive protein (CRP), and homocysteine (Hcy) is common practice in clinical settings to evaluate heart function and predict cardiovascular events.
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
Cardiac myocytes produce these hormones in response to ventricular stretching...
Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which forms a...
Venous Thrombosis III: Interprofessional Care01:29

Venous Thrombosis III: Interprofessional Care

Venous thrombosis requires effective prevention and treatment strategies to improve patient outcomes and reduce potential complications.Prevention StrategiesHealthcare providers must prioritize preventing venous thromboembolism (VTE) for all adult patients upon admission. Interventions depend on bleeding and thrombosis risk, medical history, current medications, diagnoses, planned procedures, and patient preferences. Patients on bed rest should change positions every two hours and, if not...

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Related Experiment Video

Updated: Jul 14, 2026

Ferric Chloride-induced Murine Thrombosis Models
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Ferric Chloride-induced Murine Thrombosis Models

Published on: September 5, 2016

Hyperhomocysteinemia and thrombosis: an overview.

Mohamed M Eldibany1, Joseph A Caprini

  • 1Department of Pathology and Laboratory Medicine, Evanston Northwestern Healthcare, Northwestern University Feinberg School of Medicine, Evanston, IL 60201, USA. meldibany@enh.org

Archives of Pathology & Laboratory Medicine
|June 7, 2007
PubMed
Summary

High homocysteine levels (hyperhomocysteinemia) are linked to vascular disease. While severe cases show links to atherosclerosis, the impact of mild hyperhomocysteinemia and its genetic causes on thrombosis remains debated.

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Last Updated: Jul 14, 2026

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Experimental and Imaging Techniques for Examining Fibrin Clot Structures in Normal and Diseased States
07:09

Experimental and Imaging Techniques for Examining Fibrin Clot Structures in Normal and Diseased States

Published on: April 1, 2015

Area of Science:

  • Biochemistry
  • Genetics
  • Vascular Medicine

Background:

  • Homocysteine is a key metabolic intermediary in transmethylation and transsulfuration.
  • Essential reactions involving homocysteine support cellular growth, differentiation, and function.
  • Elevated homocysteine levels (hyperhomocysteinemia) are implicated in vascular diseases.

Purpose of the Study:

  • To review homocysteine metabolism and hyperhomocysteinemia.
  • To examine the link between homocysteine, MTHFR defects, and thromboembolism.
  • To assess the role of vitamin supplementation in managing hyperhomocysteinemia.

Main Methods:

  • Comprehensive review of published medical and scientific literature.
  • Selection and critical appraisal of articles relevant to the study objectives.
  • Synthesis and comparison of findings from pertinent studies.

Main Results:

  • The association between hyperhomocysteinemia and thrombosis is controversial.
  • Severe hyperhomocysteinemia is linked to atherosclerosis.
  • The role of mild hyperhomocysteinemia in thrombosis is less certain.

Conclusions:

  • Coinheritance of MTHFR defects and Factor V Leiden increases venous thromboembolism risk.
  • The link between MTHFR defects alone and venous thrombosis is unclear.
  • High-dose folic acid for lowering homocysteine may not always be necessary.