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Related Concept Videos

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...
Venous Thrombosis I: Introduction01:30

Venous Thrombosis I: Introduction

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...
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.
Structure and Function of Platelets01:18

Structure and Function of Platelets

The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000 platelets, with...
Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

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.
Peripheral Artery Disease I: Introduction01:30

Peripheral Artery Disease I: Introduction

Peripheral artery disease (PAD) predominantly results from atherosclerosis, which involves the accumulation of fatty deposits, or plaques, within the walls of arteries. This causes them to narrow and harden, significantly reducing blood flow. PAD predominantly affects the legs, particularly the arteries supplying the thighs and calves. In rare cases, it may involve other arteries, including those in the arms.Etiology of PAD:The principal cause of PAD is atherosclerosis, which results from fatty...

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Related Experiment Video

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Microvascular Embolism Mouse Model for In Vivo Two-photon Microscopy Using Fluorescent Polystyrene Microspheres
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Microparticles and thrombotic disease.

Pavel Davizon1, José A López

  • 1Research Division, Puget Sound Blood Center, Seattle, WA 98104, USA.

Current Opinion in Hematology
|July 17, 2009
PubMed
Summary

Cell-derived microparticles (MPs) are increasingly recognized for their role in hemostasis and thrombosis, especially in cancer patients. High levels of these prothrombotic MPs are linked to increased thrombosis risk.

Area of Science:

  • Biochemistry
  • Hematology
  • Oncology

Background:

  • Cell-derived microparticles (MPs) are increasingly recognized for their biological significance.
  • Their role in hemostasis and thrombosis is evident, particularly in cancer patients, despite a lack of standardized analysis protocols.

Purpose of the Study:

  • To review recent insights into the mechanisms by which MPs modulate hemostasis and increase thrombosis risk.
  • To focus on the role of MPs in cancer-associated thrombosis.
  • To review mechanisms of MP generation and clearance.

Main Methods:

  • Literature review of recent scientific findings on microparticles.
  • Analysis of mechanisms modulating hemostasis and thrombosis.
  • Examination of cancer-associated thrombosis and MP generation/clearance.

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Determination of the Procoagulant Activity of Extracellular Vesicle (EV) Using EV-Activated Clotting Time (EV-ACT)

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Routine Screening Method for Microparticles in Platelet Transfusions
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Routine Screening Method for Microparticles in Platelet Transfusions

Published on: January 31, 2018

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Microvascular Embolism Mouse Model for In Vivo Two-photon Microscopy Using Fluorescent Polystyrene Microspheres
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Determination of the Procoagulant Activity of Extracellular Vesicle (EV) Using EV-Activated Clotting Time (EV-ACT)
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Determination of the Procoagulant Activity of Extracellular Vesicle (EV) Using EV-Activated Clotting Time (EV-ACT)

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Routine Screening Method for Microparticles in Platelet Transfusions
09:49

Routine Screening Method for Microparticles in Platelet Transfusions

Published on: January 31, 2018

Main Results:

  • Elevated levels of circulating MPs are prothrombotic.
  • MPs play a significant role in modulating hemostasis and increasing thrombosis risk.
  • Cancer patients exhibit a notable association between MPs and thrombosis.

Conclusions:

  • Standardization of MP definition and analysis methods is crucial.
  • Further elucidation of MP generation, clearance, and biological roles, including thrombosis, is needed.
  • These insights will facilitate the development of novel therapeutic interventions.