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Related Concept Videos

Coagulation01:06

Coagulation

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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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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.
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Leveraging Turbidity and Thromboelastography for Complementary Clot Characterization
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Optical Thromboelastography to evaluate whole blood coagulation.

Zeinab Hajjarian1, Markandey M Tripathi1, Seemantini K Nadkarni2

  • 1Wellman Center For Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA.

Journal of Biophotonics
|April 5, 2014
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Summary

Optical Thromboelastography (OTEG) measures blood viscoelasticity using laser speckle fluctuations for rapid coagulation assessment. This new method aids in diagnosing blood clotting disorders at the point-of-care.

Keywords:
Bloodcoagulationlaser speckleoptical thromboelastographyrheologythromboelastographyviscoelasticity

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Area of Science:

  • Biomedical Engineering
  • Hematology
  • Optical Physics

Background:

  • Blood viscoelasticity is a key indicator of hemostasis.
  • Accurate measurement of viscoelasticity is crucial for diagnosing coagulopathies.
  • Existing methods may not be suitable for point-of-care diagnostics.

Purpose of the Study:

  • To introduce Optical Thromboelastography (OTEG) as a novel method for measuring blood viscoelasticity.
  • To evaluate OTEG's performance against traditional rheometry.
  • To demonstrate OTEG's potential for point-of-care coagulation status assessment.

Main Methods:

  • Utilizing temporal laser speckle fluctuations from blood drops.
  • Applying cross-correlation analysis to speckle frames to determine temporal autocorrelation (g2(t)).
  • Calculating mean square displacement (MSD) and estimating blood viscoelastic modulus.

Main Results:

  • OTEG results showed strong correlation with mechanical rheometry.
  • Spatio-temporal speckle analysis generated 2D maps of clot viscoelasticity.
  • Micro-clot formation rates were identifiable in normal and coagulopathic samples.

Conclusions:

  • OTEG accurately measures blood viscoelasticity and coagulation status.
  • The technique enables rapid, point-of-care evaluation of hemostasis.
  • OTEG shows promise for diagnosing coagulopathies efficiently.