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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...
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...
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...
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...
Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

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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Related Experiment Video

Updated: Jun 18, 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

Published on: February 14, 2017

Coagulation concepts update.

Stacy D O'Connor1, Andrew J Taylor, Eliot C Williams

  • 1Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA.

AJR. American Journal of Roentgenology
|November 26, 2009
PubMed
Summary
This summary is machine-generated.

Radiologists can optimize patient care by updating their knowledge on coagulation assessment tools, hemostatic medications, and transfusion strategies. This review synthesizes recent literature to guide practice and improve efficiency.

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Last Updated: Jun 18, 2026

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
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Published on: February 27, 2026

Area of Science:

  • Radiology
  • Hematology
  • Medical Practice

Background:

  • A comprehensive radiology review on coagulation was last published in 1990.
  • Extensive research in medical and surgical literature has since emerged, offering guidance for radiology practices.

Purpose of the Study:

  • To analyze recent publications on coagulation.
  • To update radiologists on the use and interpretation of coagulation assessment tools.
  • To inform about medications affecting the hemostatic system and pre-intervention transfusion strategies.

Main Methods:

  • Literature review and analysis of published studies.
  • Synthesis of information on coagulation assessment, pharmacologic interventions, and transfusion protocols.

Main Results:

  • Coagulation assessment tools remain fundamentally the same.
  • Subspecialty research indicates opportunities for modifying and streamlining tool usage.
  • Potential for reducing patient and healthcare system time and costs.

Conclusions:

  • Basic coagulation assessment tools are unchanged.
  • Recent research supports optimized and efficient use of these tools.
  • Streamlined approaches can enhance patient safety and reduce healthcare expenses.