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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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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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Varicose Veins I: Introduction01:26

Varicose Veins I: Introduction

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Varicose veins, or varicosities, are abnormally dilated and twisted superficial veins caused by venous valve incompetence. This condition commonly affects the lower extremities, especially the saphenous veins, due to the higher pressure from prolonged standing and walking. However, varicosities can also occur in other areas, such as the esophagus, vulva, spermatic cords, and anorectal region.Etiology and typesPrimary varicose veins, often idiopathic, are more common in women due to inherent...
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Venous Thrombosis III: Interprofessional Care01:29

Venous Thrombosis III: Interprofessional Care

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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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Varicose Veins II: Diagnostic Studies and Interprofessional Care01:26

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Varicose veins, or varicosities, develop when the valves in the veins, which control blood flow, weaken or damage. It causes blood to pool and the veins to enlarge. Understanding the clinical manifestations, diagnostic approaches, and management options for varicose veins is crucial for effective treatment and relief.Clinical manifestationsClinical manifestations of varicose veins include a heavy, achy feeling or pain after prolonged standing or sitting. This discomfort can often be relieved by...
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Veins of Head and Neck01:19

Veins of Head and Neck

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The blood drainage from the head and neck is primarily managed by three pairs of veins: the external jugular, internal jugular, and vertebral veins. The external jugular veins drain superficial scalp and face structures, passing over the sternocleidomastoid muscles to empty into the subclavian veins.
On the other hand, the vertebral veins, unlike their arterial counterparts, are not primarily responsible for brain drainage. Instead, they drain the cervical vertebrae, spinal cord, and some small...
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Related Experiment Video

Updated: Apr 4, 2026

A Patient-Derived Xenograft Model for Venous Malformation
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Common and specific effects of TIE2 mutations causing venous malformations.

Marjut Nätynki1, Jaakko Kangas1, Ilkka Miinalainen2

  • 1Oulu Center for Cell-Matrix Research, Biocenter Oulu and Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland.

Human Molecular Genetics
|August 31, 2015
PubMed
Summary

Mutations in the TIE2 gene cause venous malformations (VMs) by disrupting endothelial cell function and extracellular matrix integrity. This study reveals how specific TIE2 mutations lead to chronic MAPK pathway activation and altered proteolytic balance.

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Area of Science:

  • Vascular Biology
  • Molecular Genetics
  • Cell Biology

Background:

  • Venous malformations (VMs) are vascular defects often linked to TIE2 gene mutations.
  • Understanding the cellular and molecular mechanisms of TIE2 mutations is crucial for VM pathogenesis.

Purpose of the Study:

  • To analyze a comprehensive set of 22 TIE2 mutations in patients with VMs.
  • To elucidate the common and mutation-specific cellular and molecular features of TIE2 mutations.
  • To correlate mutation characteristics with disease phenotypes and genetic findings.

Main Methods:

  • Endothelial cell (EC) cultures
  • Mouse models of VM
  • Ultrastructural analysis of patient tissue biopsies
  • Analysis of single and double TIE2 mutations

Main Results:

  • TIE2 mutations lead to defective receptor trafficking and impaired ligand response.
  • Mutations cause chronic MAPK pathway activation, resulting in EC monolayer loss due to fibronectin deficiency.
  • Upregulation of the plasminogen/plasmin pathway and an imbalance in plasminogen activators/inhibitors contribute to high d-dimer levels in VMs.

Conclusions:

  • TIE2 mutations induce distinct cellular and molecular defects in endothelial cells and extracellular matrix.
  • The findings provide insights into the pathogenesis of venous malformations and the role of TIE2 signaling.
  • Understanding these mechanisms may aid in developing targeted therapies for VMs.