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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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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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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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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.
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Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
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A General Shear-Dependent Model for Thrombus Formation.

Alireza Yazdani1, He Li1, Jay D Humphrey2

  • 1Division of Applied Mathematics, Brown University, Providence, Rhode Island, United States of America.

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|January 18, 2017
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Summary
This summary is machine-generated.

This study presents a new computational model for platelet behavior, crucial for understanding blood clot formation. The model accurately predicts platelet adhesion and aggregation across various blood flow conditions, aiding thrombosis research.

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Area of Science:

  • Biomedical Engineering
  • Computational Fluid Dynamics
  • Hematology

Background:

  • Platelet transport, activation, and adhesion are critical for thrombus formation in both normal and pathological states.
  • Predicting thrombus development requires accurate modeling of platelet dynamics under varying physiological conditions.

Purpose of the Study:

  • To develop and calibrate a shear-dependent platelet adhesive model using the Morse potential.
  • To integrate this model into a coupled Eulerian-Lagrangian framework for simulating blood flow and platelet behavior.
  • To incorporate coagulation cascade modeling for a comprehensive thrombus formation simulation.

Main Methods:

  • Developed a shear-dependent platelet adhesive model based on the Morse potential, calibrated with experimental data.
  • Implemented an Eulerian-Lagrangian approach for simulating hemodynamics and tracking platelets.
  • Introduced a force coupling method for bidirectional interaction between platelets and blood flow.
  • Coupled the platelet aggregation model with a tissue-factor/contact pathway coagulation cascade.

Main Results:

  • The proposed model is validated for a wide range of flow shear rates, encompassing both low-shear (e.g., aneurysms) and high-shear (e.g., stenotic arteries) conditions.
  • Successfully integrated platelet dynamics with coagulation processes to simulate thrombin generation and fibrin deposition.
  • Demonstrated the model's capability to cover conditions relevant to venous and arterial thrombosis.

Conclusions:

  • The developed computational model provides a robust tool for investigating thrombus formation and growth.
  • The model's ability to span diverse shear rates enhances its applicability to various thrombotic pathologies.
  • This integrated approach advances the understanding of the complex interplay between hemodynamics, platelet function, and coagulation in thrombosis.