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Related Concept Videos

Venous Thrombosis I: Introduction01:30

Venous Thrombosis I: Introduction

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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...
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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...
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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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Venous thrombosis requires effective prevention and treatment strategies to improve patient outcomes and reduce potential complications.Prevention StrategiesHealthcare providers must prioritize preventing venous thromboembolism (VTE) for all adult patients upon admission. Interventions depend on bleeding and thrombosis risk, medical history, current medications, diagnoses, planned procedures, and patient preferences. Patients on bed rest should change positions every two hours and, if not...
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Venous Thrombosis II: Clinical Manifestations and Diagnostic Studies01:20

Venous Thrombosis II: Clinical Manifestations and Diagnostic Studies

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The key difference between Superficial Vein Thrombosis (SVT) and Deep Vein Thrombosis (DVT) lies in their location and severity.Clinical ManifestationsSVT typically presents with localized pain, tenderness, and redness along the course of a superficial vein, often accompanied by a palpable, cord-like structure under the skin. This condition is usually less dangerous than DVT but can be uncomfortable and may lead to complications such as cellulitis or, rarely, a clot extension into the deep...
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Related Experiment Video

Updated: Dec 14, 2025

A Fibrin-Enriched and tPA-Sensitive Photothrombotic Stroke Model
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Small thrombus size, thrombus composition, and poor collaterals predict pre-interventional thrombus migration.

Peter B Sporns1,2, Hermann Krähling3, Marios N Psychogios4

  • 1Department of Neuroradiology, Clinic for Radiology & Nuclear Medicine, University Hospital Basel, Basel, Switzerland peter.sporns@hotmail.de.

Journal of Neurointerventional Surgery
|July 22, 2020
PubMed
Summary

Smaller clots, rich in red blood cells (RBCs), are more likely to migrate in acute ischemic stroke. Good collateral circulation significantly limits this thrombus migration, suggesting improved vessel wall adherence for larger clots.

Keywords:
angiographystrokethrombectomy

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Area of Science:

  • Neurology
  • Vascular Medicine
  • Medical Imaging

Background:

  • Imaging characteristics like clot burden and collaterals influence stroke outcomes.
  • Thrombus migration is linked to histological composition and functional outcomes.
  • Hypothesized that clot size and collateral status mediate thrombus migration.

Purpose of the Study:

  • Investigate the relationship between clot burden, migration probability, and collateral status.
  • Determine if collateral status mediates thrombus migration tendency.
  • Analyze factors influencing thrombus migration in acute ischemic stroke.

Main Methods:

  • Prospective cohort study of ischemic stroke patients.
  • Clot burden and collateral scores assessed via imaging.
  • Retrieved thrombi underwent histological analysis.
  • Mediation analysis used to explore relationships.

Main Results:

  • 36% of 163 patients experienced clot migration.
  • Migration associated with lower collateral scores, higher clot burden, shorter thrombi, and higher RBC count.
  • Higher collateral scores linked to higher clot burden and younger age.
  • Clot burden directly increases migration; collaterals indirectly reduce it.

Conclusions:

  • Smaller, erythrocyte-rich thrombi exhibit higher migration probability.
  • Adequate collateral circulation effectively limits thrombus migration.
  • Findings support clot size and collateral counter-pressure influencing migration.