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Related Concept Videos

Disorders of Hemostasis01:24

Disorders of Hemostasis

Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.
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...
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...
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...
Introduction to Hemostasis01:05

Introduction to Hemostasis

Hemostasis is a complex physiological process that prevents excessive bleeding when a blood vessel is injured. It's crucial for maintaining the integrity of the circulatory system, as it ensures that our blood remains fluid while still within the vascular network and yet clots to prevent blood loss upon vessel injury.
The three phases of hemostasis involve many clotting factors present in plasma and several substances released by platelets and injured tissue cells. It is a fast, localized, and...
Rh Blood Group01:19

Rh Blood Group

The Rhesus (Rh) antigen is crucial in determining blood groups and ensuring compatibility during blood transfusions.

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Management of women with type 2B von Willebrand disease during pregnancy and postpartum: guidance from ISTH SSC subcommittees on von Willebrand factor and women's health issues in thrombosis and hemostasis.

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Related Experiment Video

Updated: Jul 6, 2026

Investigating von Willebrand Factor Pathophysiology Using a Flow Chamber Model of von Willebrand Factor-platelet String Formation
08:30

Investigating von Willebrand Factor Pathophysiology Using a Flow Chamber Model of von Willebrand Factor-platelet String Formation

Published on: August 14, 2017

Von Willebrand disease.

Jeremy Robertson1, David Lillicrap, Paula D James

  • 1Division of Hematology/Oncology, Hospital for Sick Children, 555 University Avenue, Toronto, ON M5G 1X8, Canada.

Pediatric Clinics of North America
|April 3, 2008
PubMed
Summary

von Willebrand disease, a common inherited bleeding disorder, often diagnosed in childhood, significantly impacts quality of life. Early recognition and diagnosis are crucial for managing this condition in pediatric patients.

Area of Science:

  • Hematology
  • Pediatric Medicine
  • Genetics

Background:

  • von Willebrand disease is a prevalent inherited bleeding disorder.
  • Diagnosis frequently occurs during childhood, affecting quality of life.
  • Timely recognition and diagnosis are essential for patient management.

Purpose of the Study:

  • To review the pathophysiology of von Willebrand disease.
  • To discuss the current classification system for the disorder.
  • To outline available treatments, focusing on pediatric considerations.

Main Methods:

  • Literature review of pathophysiology.
  • Analysis of current classification schemes.
  • Summary of treatment options for pediatric populations.

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Live-cell Imaging of Platelet Degranulation and Secretion Under Flow
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Live-cell Imaging of Platelet Degranulation and Secretion Under Flow

Published on: July 10, 2017

Pneumococcus Infection of Primary Human Endothelial Cells in Constant Flow
09:34

Pneumococcus Infection of Primary Human Endothelial Cells in Constant Flow

Published on: October 31, 2019

Related Experiment Videos

Last Updated: Jul 6, 2026

Investigating von Willebrand Factor Pathophysiology Using a Flow Chamber Model of von Willebrand Factor-platelet String Formation
08:30

Investigating von Willebrand Factor Pathophysiology Using a Flow Chamber Model of von Willebrand Factor-platelet String Formation

Published on: August 14, 2017

Live-cell Imaging of Platelet Degranulation and Secretion Under Flow
11:42

Live-cell Imaging of Platelet Degranulation and Secretion Under Flow

Published on: July 10, 2017

Pneumococcus Infection of Primary Human Endothelial Cells in Constant Flow
09:34

Pneumococcus Infection of Primary Human Endothelial Cells in Constant Flow

Published on: October 31, 2019

Main Results:

  • Detailed review of von Willebrand disease mechanisms.
  • Overview of established diagnostic criteria and classifications.
  • Discussion of therapeutic strategies tailored for children.

Conclusions:

  • Understanding pathophysiology aids diagnosis and treatment.
  • Current classification provides a framework for management.
  • Effective treatment strategies are available for pediatric von Willebrand disease, improving quality of life.