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Related Concept Videos

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.
Vascular Spasm01:16

Vascular Spasm

The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last for...
Formation of the Platelet Plug01:22

Formation of the Platelet Plug

The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
Tissue Homogenization and Cell Lysis01:32

Tissue Homogenization and Cell Lysis

Tissue homogenization involves disintegrating tissue architecture and lysing cells, and is an early step in isolating and analyzing cellular components. The method used for homogenization depends on the sample type, the amount of sample available, the analyte to be obtained, and the sensitivity of the method. These methods are broadly classified as mechanical and non-mechanical methods.
Mechanical methods of tissue homogenization
These methods rely on applying external physical force to disrupt...

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Related Experiment Video

Updated: May 28, 2026

Experimental and Imaging Techniques for Examining Fibrin Clot Structures in Normal and Diseased States
07:09

Experimental and Imaging Techniques for Examining Fibrin Clot Structures in Normal and Diseased States

Published on: April 1, 2015

Is "Physiological Lysis" in Viscoelastometry a Plasmin-Mediated Process?

Anikó Smudla1, Herbert Schöchl2, Andreas Calatzis3

  • 1Department of Intensive Therapy, Semmelweis University, 1082 Budapest, Hungary.

Diagnostics (Basel, Switzerland)
|May 27, 2026
PubMed
Summary
This summary is machine-generated.

Low maximum lysis (ML) values in viscoelastic testing may not indicate reduced fibrinolysis. Tranexamic acid did not affect ML, suggesting other mechanisms like platelet retraction are involved.

Keywords:
clot retractionmaximum lysisphysiologic lysistranexamic acidviscoelastometry

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Area of Science:

  • Coagulation and Hemostasis
  • Clinical Pathology
  • Diagnostic Medicine

Background:

  • Viscoelastic testing (VET) guides hemostatic therapy for coagulopathy.
  • Maximum lysis (ML) quantifies fibrinolysis, a reduction in clot amplitude.
  • Low ML values are linked to adverse outcomes, but their cause is unclear.

Purpose of the Study:

  • To investigate if low ML in tissue factor-activated viscoelastic assays reflects reduced plasmin-mediated fibrinolysis.
  • To compare VET results with and without antifibrinolytic agents.

Main Methods:

  • 120 healthy adults were studied.
  • Tissue factor-activated viscoelastic assays (EX-assay) were performed with and without tranexamic acid.
  • VET parameters were compared using correlation and Bland-Altman analyses.

Main Results:

  • ML values were similar between assays (mean 5.9% vs. 6.0%).
  • Tranexamic acid did not significantly alter ML.
  • Strong agreement was found for clot firmness and ML between the two assay types.

Conclusions:

  • Low ML values in TF-triggered viscoelastic assays are not explained by reduced plasmin-mediated fibrinolysis.
  • Alternative mechanisms, potentially platelet-mediated clot retraction, may contribute to low ML.
  • Findings challenge the interpretation of low ML solely as a marker of impaired fibrinolysis.