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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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Related Experiment Video

Updated: Jun 4, 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.

Paula D James1, Anne C Goodeve

  • 1Queen's University, Kingston, Ontario, Canada. jamesp@queensu.ca

Genetics in Medicine : Official Journal of the American College of Medical Genetics
|February 4, 2011
PubMed
Summary
This summary is machine-generated.

Von Willebrand disease is an inherited bleeding disorder causing excessive bleeding. Diagnosis involves specialized tests, and treatments include clotting factor concentrates or desmopressin.

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Last Updated: Jun 4, 2026

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Area of Science:

  • Hematology
  • Genetics

Background:

  • Von Willebrand disease (VWD) is a prevalent inherited bleeding disorder.
  • It is characterized by excessive mucocutaneous bleeding, including epistaxis, bruising, and menorrhagia.

Purpose of the Study:

  • To outline the subtypes, diagnosis, and management of von Willebrand disease.

Main Methods:

  • Diagnosis relies on specialized assays of von Willebrand factor (VWF) and molecular genetic testing.
  • Subtypes include quantitative (1 and 3) and qualitative variants (2A, 2B, 2M, 2N).

Main Results:

  • Type 2 variants differ in VWF-dependent platelet adhesion and VWF multimer composition.
  • Type 2N involves reduced binding of VWF to factor VIII.

Conclusions:

  • Severe bleeding is managed with VWF/factor VIII concentrates.
  • Mild bleeding may respond to desmopressin, fibrinolytic inhibitors, or hormones.