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Related Concept Videos

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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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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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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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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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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Introduction to Hemostasis01:05

Introduction to Hemostasis

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Hemostasis is a complex physiological process that prevents excessive bleeding when a blood vessel is injured. It's crucial for maintaining the integrity of the circulatory system, as it ensures that our blood remains fluid while still within the vascular network and yet clots to prevent blood loss upon vessel injury.
The three phases of hemostasis involve many clotting factors present in plasma and several substances released by platelets and injured tissue cells. It is a fast, localized,...
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von Willebrand Factor fibers formed at pathological high shear provide a scaffold for α-synuclein binding and aggregation.

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Related Experiment Video

Updated: Mar 22, 2026

In Vitro Microfluidic Disease Model to Study Whole Blood-Endothelial Interactions and Blood Clot Dynamics in Real-Time
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Systems Analysis of Thrombus Formation.

Scott L Diamond1

  • 1From the Department of Chemical Engineering, Institute for Medicine and Engineering, University of Pennsylvania, Philadelphia. sld@seas.upenn.edu.

Circulation Research
|April 30, 2016
PubMed
Summary

Systems biology quantitatively predicts blood clot formation in arteries and veins. This approach offers metrics for clot growth, thrombotic risk, and therapeutic targets, aiding in predicting heart attacks and strokes.

Keywords:
blood plateletsfibrinhemodynamicsthrombinvon Willebrand factor

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Area of Science:

  • Biomedical Engineering
  • Computational Biology
  • Hematology

Background:

  • Thrombosis involves complex interactions of blood components, vessel walls, and hemodynamics.
  • Arterial and venous thrombosis differ in their underlying mechanisms, including flow conditions and cellular contributors.
  • Understanding these differences is crucial for developing targeted therapies.

Purpose of the Study:

  • To establish a quantitative systems biology framework for predicting thrombosis.
  • To develop metrics for clot growth rate, thrombotic risk, and drug response.
  • To evaluate the efficacy of novel therapeutic strategies.

Main Methods:

  • Utilizing computational fluid dynamics (CFD) for patient-specific hemodynamic analysis.
  • Employing high-dimensional ex vivo phenotyping of platelets and coagulation factors.
  • Developing multiscale computer simulations from subcellular to whole vessel levels.

Main Results:

  • Distinguishing key differences in thrombosis drivers between arterial (atherosclerosis, high shear stress) and venous (stasis, inflammation) systems.
  • Enabling patient-specific assessment of hemodynamics and fractional flow reserve.
  • Providing a foundation for simulating thrombotic events like heart attacks and strokes.

Conclusions:

  • A systems biology approach offers a powerful tool for quantitative thrombosis prediction.
  • This framework can guide the development and evaluation of pharmacological interventions.
  • It facilitates the ranking of safety and efficacy metrics for clinical trial designs.