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Related Concept Videos

Disorders of Hemostasis01:24

Disorders of Hemostasis

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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.
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Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

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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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Coagulation01:09

Coagulation

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The coagulation phase is a critical part of the body's process to prevent blood loss following injury to blood vessels. It involves chemical reactions that form a clot to seal the injured area. The clotting process begins shortly after injury, within 15-20 seconds for severe damage and 1-2 minutes for minor injuries.
During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...
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Coagulation01:06

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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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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Updated: Dec 18, 2025

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

Yang Fei1, Ning Tang1, Hefei Liu2

  • 1From the Department of Laboratory Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China (Fei, Tang).

Archives of Pathology & Laboratory Medicine
|June 20, 2020
PubMed
Summary
This summary is machine-generated.

COVID-19 causes coagulation dysfunction and thrombotic complications. Anticoagulant and thrombolytic treatments may help manage these issues by reducing thrombin generation and inflammation.

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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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In Vitro Microfluidic Disease Model to Study Whole Blood-Endothelial Interactions and Blood Clot Dynamics in Real-Time
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Area of Science:

  • * Hematology
  • * Infectious Diseases
  • * Critical Care Medicine

Background:

  • * Coronavirus disease 2019 (COVID-19), caused by SARS-CoV-2, is a contagious respiratory illness.
  • * Coagulation dysfunction is a significant characteristic of COVID-19, leading to severe thrombotic complications.

Purpose of the Study:

  • * To review literature on COVID-19-related coagulation activation mechanisms.
  • * To discuss implications of anticoagulant and thrombolytic therapies in managing COVID-19 patients.

Main Methods:

  • * Systematic review of scientific papers on COVID-19.
  • * Literature search conducted on PubMed NCBI, medRxiv, and Preprints up to May 15, 2020.
  • * Inclusion of author experience in managing thrombotic events in COVID-19 patients.

Main Results:

  • * COVID-19-associated coagulopathy presents with varying severity, from laboratory changes to disseminated intravascular coagulation (DIC).
  • * High D-dimer levels correlate with disease progression and reduced survival.
  • * SARS-CoV-2 infection activates immune-hemostatic responses, including cytokine storm, vasculopathy, and NETosis, leading to hypercoagulability.

Conclusions:

  • * Hypercoagulability and thrombosis in COVID-19 necessitate anticoagulant and thrombolytic interventions.
  • * These treatments can reduce excessive thrombin generation and inflammation.
  • * Therapeutic strategies aim to balance hemostasis and reduce thrombotic complications in severe COVID-19.