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Venous Thrombosis I: Introduction01:30

Venous Thrombosis I: Introduction

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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...
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Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

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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...
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Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

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After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
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Venous Thrombosis III: Interprofessional Care01:29

Venous Thrombosis III: Interprofessional Care

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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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Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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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...
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Formation of the Platelet Plug01:22

Formation of the Platelet Plug

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The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
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Related Experiment Video

Updated: Mar 3, 2026

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
09:38

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

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Probing the Dynamics of Clot-Bound Thrombin at Venous Shear Rates.

Laura M Haynes1, Thomas Orfeo1, Kenneth G Mann2

  • 1Department of Biochemistry, Robert Larner M.D. College of Medicine, University of Vermont, Colchester, Vermont.

Biophysical Journal
|April 27, 2017
PubMed
Summary

Fibrin-bound thrombin remains stable under venous flow, showing resistance to antithrombin/heparin but susceptibility to dabigatran. This highlights the complex dynamics of thrombin inhibition within a fibrin matrix.

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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
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Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro
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Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro

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Area of Science:

  • Biochemistry
  • Hematology
  • Biophysics

Background:

  • Exosite-mediated thrombin binding to fibrin enhances clot stability.
  • Fibrin-bound thrombin exhibits differential inhibition susceptibility to antithrombin/heparin versus active-site inhibitors.
  • Fibrin possesses both low-affinity (Kd = 2.8 μM) and high-affinity (Kd = 0.15 μM) thrombin binding sites.

Purpose of the Study:

  • To evaluate the stability of fibrin-bound thrombin under simulated venous flow conditions.
  • To determine the accessibility and susceptibility of clot-bound thrombin to inhibition.

Main Methods:

  • Development of a parallel-plate flow chamber to study thrombin adhesion to fibrin under venous shear rates (46-184 s⁻¹).
  • Utilized a thrombin-specific fluorogenic substrate (SN-59) to monitor enzyme activity.
  • Employed a mathematical model to simulate thrombin-fibrin interactions.

Main Results:

  • A subpopulation of thrombin remained stably adhered to fibrin for over 30 minutes under venous flow.
  • Thrombin adhesion was saturable at >500 nM and dependent on initial fibrinogen concentration.
  • Antithrombin/heparin inhibited 72% of clot-bound thrombin, while dabigatran showed reversible inhibition (50-93%).

Conclusions:

  • Clot-bound thrombin exhibits significant stability due to dynamic rearrangement within the fibrin matrix.
  • The binding affinity and accessibility of thrombin to inhibitors are influenced by the fibrin structure.
  • Understanding these interactions is crucial for developing targeted anticoagulant therapies.