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Related Concept Videos

Vascular Spasm01:16

Vascular Spasm

The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last for...
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...
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...
Acute Inflammation III: Local and Systemic Effects01:25

Acute Inflammation III: Local and Systemic Effects

Acute inflammation produces a coordinated set of local and systemic changes that limit injury, eliminate pathogens, and initiate repair. These responses arise within minutes of infection, trauma, or chemical insult and are driven by vascular alterations and leukocyte-derived mediators. When the stimulus resolves, the reaction typically abates within days.Local EffectsAt the site of injury, arteriolar vasodilation increases blood flow, resulting in redness and warmth. Simultaneously, increased...
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...
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.

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Related Experiment Video

Updated: Jun 22, 2026

Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro
10:25

Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro

Published on: March 19, 2016

Hemostatic changes in vasculitides.

A Trifiletti1, R Scamardi, G F Bagnato

  • 1Department of Internal Medicine, University of Messina, Italy.

Thrombosis Research
|June 16, 2009
PubMed
Summary
This summary is machine-generated.

Systemic vasculitides involve blood vessel inflammation, increasing clotting risk and cardiovascular disease. Effective antithrombotic therapy strategies are crucial but not yet established for these rare diseases.

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Last Updated: Jun 22, 2026

Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro
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Intravital Microscopy of Leukocyte-endothelial and Platelet-leukocyte Interactions in Mesenterial Veins in Mice
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Microfluidics in Assessing Platelet Function
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Area of Science:

  • Rheumatology
  • Hematology
  • Cardiovascular Medicine

Background:

  • Systemic vasculitides are rare, heterogeneous diseases causing blood vessel wall inflammation and necrosis.
  • The inflammatory process in vasculitis dysregulates coagulation, impairs anticoagulation and fibrinolysis, and increases platelet activity.
  • Patients with vasculitis have elevated risks of atherosclerosis, cardiovascular disease, and cardiovascular events.

Purpose of the Study:

  • To highlight the complex interplay between vasculitis and thrombotic processes.
  • To emphasize the increased cardiovascular risk in patients with vasculitic syndromes.
  • To underscore the need for a defined antithrombotic therapy strategy in vasculitis management.

Main Methods:

  • Review of existing literature on vasculitis pathophysiology and thrombotic complications.
  • Analysis of the impact of vasculitis on coagulation and fibrinolysis.
  • Examination of cardiovascular risk factors and outcomes in vasculitic populations.

Main Results:

  • Vasculitis activates pro-coagulant factors, inhibits anti-coagulant mechanisms, and promotes platelet activation.
  • Endothelial dysfunction is a key feature, contributing to thrombotic risk.
  • Mortality remains high, with a significant burden of cardiovascular disease.

Conclusions:

  • Systemic vasculitides present a complex pro-thrombotic state.
  • Antiphospholipid syndrome can be associated with vasculitis, further increasing thrombotic risk.
  • Developing clear antithrombotic management strategies for vasculitis patients is a critical unmet need.