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Related Concept Videos

Disorders of Hemostasis01:24

Disorders of Hemostasis

2.7K
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.
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Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

2.3K
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...
2.3K
Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

15.2K
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...
15.2K
Introduction to Hemostasis01:05

Introduction to Hemostasis

16.2K
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,...
16.2K
Formation of the Platelet Plug01:22

Formation of the Platelet Plug

10.6K
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...
10.6K
Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

10.1K
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.
10.1K

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Related Experiment Video

Updated: Mar 26, 2026

A Simple Protocol for Platelet-mediated Clumping of Plasmodium falciparum-infected Erythrocytes in a Resource Poor Setting
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A Simple Protocol for Platelet-mediated Clumping of Plasmodium falciparum-infected Erythrocytes in a Resource Poor Setting

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Emerging roles for hemostatic dysfunction in malaria pathogenesis.

Jamie M O'Sullivan1, Roger J S Preston2, Niamh O'Regan1

  • 1Haemostasis Research Group, Institute of Molecular Medicine, Trinity Centre for Health Sciences, St. James's Hospital, and.

Blood
|February 7, 2016
PubMed
Summary
This summary is machine-generated.

Severe malaria, particularly cerebral malaria (CM), is a major global health threat. Hemostatic dysfunction, involving factors like von Willebrand factor and coagulation pathways, significantly impacts malaria progression and offers potential therapeutic targets.

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Methods to Investigate the Regulatory Role of Small RNAs and Ribosomal Occupancy of Plasmodium falciparum
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Author Spotlight: Identifying Compensatory Pathways in Malaria Parasites Containing Hypomorphic Allele of Essential Protein Kinases
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Author Spotlight: Identifying Compensatory Pathways in Malaria Parasites Containing Hypomorphic Allele of Essential Protein Kinases
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Author Spotlight: Identifying Compensatory Pathways in Malaria Parasites Containing Hypomorphic Allele of Essential Protein Kinases

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Area of Science:

  • Infectious Diseases
  • Hematology
  • Pathophysiology

Background:

  • Severe Plasmodium falciparum malaria causes significant mortality, especially in sub-Saharan Africa.
  • The molecular mechanisms underlying severe malaria and cerebral malaria (CM) pathophysiology are not fully understood.
  • Sequestration of infected erythrocytes, endothelial activation, and platelet roles are implicated in CM.

Purpose of the Study:

  • To review recent studies on the role of hemostatic dysfunction in malaria pathogenesis.
  • To highlight novel molecular mechanisms linking hemostasis to severe malaria.
  • To identify potential adjunctive therapeutic strategies for CM.

Main Methods:

  • Literature review of recent studies on malaria pathogenesis and hemostasis.
  • Focus on emerging data concerning von Willebrand factor, coagulation cascade, and protein C pathway.
  • Analysis of molecular mechanisms influencing malaria progression.

Main Results:

  • Hemostatic dysfunction plays a direct and significant role in malaria pathogenesis.
  • Von Willebrand factor, coagulation cascade activation, and protein C pathway dysfunction are key factors.
  • Understanding these hemostatic roles offers insights into disease progression.

Conclusions:

  • Hemostatic dysfunction is a critical, yet underappreciated, factor in severe malaria progression.
  • Emerging data illuminate potential novel therapeutic targets for CM.
  • Adjunctive therapies targeting hemostasis are needed to reduce CM mortality.