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Related Concept Videos

Coagulation01:09

Coagulation

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...
Coagulation01:06

Coagulation

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...
Introduction to Hemostasis01:05

Introduction to Hemostasis

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, and...
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...
Hemorrhagic Stroke ll: Pathophysiology01:29

Hemorrhagic Stroke ll: Pathophysiology

A hemorrhagic stroke develops when a cerebral blood vessel ruptures, allowing blood to escape into the surrounding brain tissue, as in intracerebral hemorrhage (ICH), or into the subarachnoid space, as in subarachnoid hemorrhage (SAH). Because the skull is a rigid compartment, the sudden presence of extravascular blood rapidly increases intracranial pressure and compresses adjacent neural structures, leading to immediate tissue injury and impaired cerebral perfusion.Mass Effect and Primary...
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...

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Related Experiment Video

Updated: May 25, 2026

Determination of the Procoagulant Activity of Extracellular Vesicle (EV) Using EV-Activated Clotting Time (EV-ACT)
04:56

Determination of the Procoagulant Activity of Extracellular Vesicle (EV) Using EV-Activated Clotting Time (EV-ACT)

Published on: August 4, 2023

Acute traumatic coagulopathy.

Daniel Frith1, Ross Davenport, Karim Brohi

  • 1Trauma Sciences, Blizard Institute, Barts & The London School of Medicine & Dentistry, Queen Mary University of London, London, UK.

Current Opinion in Anaesthesiology
|January 25, 2012
PubMed
Summary

Acute traumatic coagulopathy (ATC) is an endogenous impairment of hemostasis developing at injury, not a late response. Understanding its pathophysiology is key to improving patient survival through targeted therapies.

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Determination of the Procoagulant Activity of Extracellular Vesicle (EV) Using EV-Activated Clotting Time (EV-ACT)
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Area of Science:

  • Trauma and Emergency Medicine
  • Hematology
  • Critical Care Medicine

Background:

  • Acute traumatic coagulopathy (ATC) is a significant complication following severe injury.
  • Early management of hemostasis after trauma improves survival rates.
  • Understanding the clinical importance, etiology, and pathophysiology of ATC is crucial.

Purpose of the Study:

  • To delineate the current understanding of acute traumatic coagulopathy (ATC).
  • To explore the clinical significance, causes, and underlying mechanisms of ATC.
  • To review advancements in the diagnosis and management of ATC.

Main Methods:

  • Review of recent therapeutic and observational studies.
  • Analysis of the pathophysiology of hemostatic disruption in trauma.
  • Evaluation of diagnostic modalities for ATC.

Main Results:

  • Trauma rapidly induces an endogenous coagulopathy due to disrupted hemostasis, linked to worse outcomes.
  • Novel insights into neurohormonal, vascular, and coagulation system interactions are emerging.
  • Routine coagulation tests are insufficient; viscoelastic tests show promise but require validation.

Conclusions:

  • ATC is an intrinsic impairment of hemostasis present from the time of injury.
  • Conventional views of coagulopathy as a late, iatrogenic complication are outdated.
  • Further research into the development and inhibition of ATC can enhance patient outcomes.