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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.
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...
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...
Ischemic Stroke ll: Pathophysiology01:15

Ischemic Stroke ll: Pathophysiology

An ischemic stroke occurs when a cerebral blood vessel becomes obstructed, most often by a thrombus or embolus, interrupting the delivery of oxygen and glucose to brain tissue. Because neurons rely on continuous aerobic metabolism, energy failure begins within minutes of reduced perfusion. The region receiving the least blood flow becomes the infarct core, an area of irreversible cellular death. Surrounding this core lies the penumbra, a zone of hypoperfused but still viable tissue that is...
Venous Thrombosis I: Introduction01:30

Venous Thrombosis I: Introduction

Venous thrombosis, the most common disorder of the veins, involves the formation of a thrombus or blood clot associated with vein inflammation. It can be classified as either superficial vein thrombosis or deep vein thrombosis.Superficial Vein Thrombosis: This involves the formation of a thrombus in a superficial vein, usually the greater or lesser saphenous vein. Though less severe than deep vein thrombosis (DVT), SVT can lead to complications if untreated.Deep Vein Thrombosis (DVT): This...
Ischemic Stroke l: Introduction01:15

Ischemic Stroke l: Introduction

Ischemic stroke is an acute cerebrovascular condition in which blood flow to a brain region is suddenly interrupted, leading to tissue infarction. Neurons depend on continuous oxygen and glucose supply, so even brief reductions in perfusion cause energy failure, ionic imbalance, and irreversible injury. Ischemic strokes are classified into thrombotic and embolic types based on their underlying mechanisms.Thrombotic MechanismsThrombotic stroke develops when a clot forms within a cerebral artery.

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Related Experiment Video

Updated: Jun 25, 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

Altered fibrin clot structure/function in patients with cryptogenic ischemic stroke.

Anetta Undas1, Piotr Podolec, Krystyna Zawilska

  • 1Institute of Cardiology, Jagiellonian University School of Medicine, Cracow, Poland. mmundas@cyf-kr.edu.pl

Stroke
|February 28, 2009
PubMed
Summary
This summary is machine-generated.

Fibrin clots in patients with cryptogenic stroke show altered structure and function, leading to resistance to fibrinolysis. These findings suggest a link between abnormal fibrin and stroke occurrence.

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09:42

A Fibrin-Enriched and tPA-Sensitive Photothrombotic Stroke Model

Published on: June 4, 2021

Area of Science:

  • Hematology
  • Neurology
  • Cardiovascular Research

Background:

  • Cryptogenic ischemic stroke lacks a clear cause.
  • Fibrin clot structure and function may play a role in stroke pathogenesis.

Purpose of the Study:

  • To investigate if fibrin clot structure and function are altered in patients with cryptogenic ischemic stroke.
  • To compare fibrin clot properties between stroke patients with and without patent foramen ovale (PFO) and healthy controls.

Main Methods:

  • Ex vivo analysis of plasma fibrin clot permeability, turbidimetry, and fibrinolysis efficiency.
  • Study included 89 stroke patients with PFO, 58 stroke patients without PFO, and 120 healthy controls.
  • Scanning electron microscopy was used to examine fibrin clot structure.

Main Results:

  • Stroke patients exhibited lower clot permeability, faster polymerization, prolonged lysis time, and higher D-dimer release compared to controls.
  • Fibrin clots in stroke patients showed increased fiber diameter and density.
  • Clots from stroke patients with PFO were more permeable and lysed faster than those without PFO, potentially due to lower smoking rates.

Conclusions:

  • Altered fibrin clot structure and impaired fibrinolysis are associated with cryptogenic stroke.
  • These fibrin abnormalities may contribute to the risk of ischemic stroke.