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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...

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Related Experiment Video

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Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro
10:25

Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro

Published on: March 19, 2016

Rheometry and associated techniques for blood coagulation studies.

P A Evans1, K Hawkins, M Lawrence

  • 1Division of Clinical Haemorheology, Swansea NHS Trust Hospital, Morriston, and Centre for Complex Fluids Processing, School of Engineering, Swansea University, Swansea, UK.

Medical Engineering & Physics
|September 29, 2007
PubMed
Summary

This review explores rheometrical methods for studying blood coagulation, focusing on how viscoelasticity changes during fibrin formation. It highlights the Gel Point as a key indicator of the liquid-to-solid transition in blood clotting.

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Area of Science:

  • Biophysics
  • Biomaterials Science
  • Hematology

Background:

  • Blood coagulation is a complex process involving fibrin polymerization and cross-linking.
  • Understanding the transition from liquid to solid state during coagulation is crucial for diagnosing and treating bleeding disorders.
  • Rheological techniques offer sensitive methods to probe the mechanical properties of blood during clotting.

Purpose of the Study:

  • To review and compare various rheometrical approaches for studying blood coagulation.
  • To emphasize the significance of the Gel Point as a critical endpoint in coagulation studies.
  • To discuss both established and emerging techniques for assessing blood viscoelasticity during clotting.

Main Methods:

  • Controlled stress and controlled strain rheometry for complex shear modulus measurements.
  • Thromboelastography (TEG) as a long-established technique.
  • Emerging techniques including wave propagation, free oscillation rheometry, quartz crystal microbalance (QCM), and surface plasmon resonance (SPR).

Main Results:

  • Rheometrical methods allow for the quantitative assessment of clotting time and the evolution of viscoelasticity.
  • The Gel Point, representing the liquid-to-solid transition, is a common feature detected by many rheological studies.
  • Various techniques provide complementary information on fibrin network formation and mechanical properties.

Conclusions:

  • Rheometry offers powerful tools for detailed investigation of blood coagulation dynamics.
  • Understanding the viscoelastic changes and Gel Point is vital for characterizing coagulation.
  • A range of rheometrical techniques, from established to novel, are available for comprehensive blood clotting analysis.