Related Experiment Video
Updated: Jul 23, 2026

13:08
Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay
Published on: September 9, 2012
Fibrinogen and cerebrovascular disease
1Department of Clinical Geratology, University of Oxford, Radcliffe Infirmary, U.K.
European Heart Journal
|March 1, 1995
Summary
Fibrinogen is a key risk factor for ischemic stroke, independent of other blood factors. Managing fibrinogen levels may help prevent strokes.
Area of Science:
- Neurology
- Cardiovascular Medicine
- Hematology
Background:
- Fibrinogen's role in stroke risk is debated.
- Reactive fibrinogen elevations after stroke complicate case-control studies.
- Transient ischemic attacks (TIAs) show no immediate fibrinogen increase, aiding reliable study design.
Purpose of the Study:
- To clarify fibrinogen's role as a risk factor for ischemic stroke.
- To differentiate fibrinogen's association with occlusive stroke versus intracerebral hemorrhage.
- To explore potential mechanisms linking fibrinogen to athero-thromboembolism.
Main Methods:
- Analysis of prospective observational studies.
- Case-control studies using patients with recent TIAs.
- Examination of relationships between fibrinogen and other hemostatic/haemorheological factors.
- Review of studies on fibrinogen levels and carotid artery stenosis.
Main Results:
- Fibrinogen is a significant risk factor for occlusive stroke, second only to blood pressure.
- The association is independent of other hemostatic factors like von Willebrand factor and tissue plasminogen activator.
- Fibrinogen may accelerate atherosclerosis and contribute to thrombosis, but not primarily through increased blood viscosity.
Conclusions:
- Fibrinogen is a crucial, potentially treatable risk factor for ischemic stroke.
- It should be incorporated into individual risk assessments for stroke.
- Mechanisms include promoting thrombosis and accelerating atherosclerosis.
Related Concept Videos
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...
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...
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...
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.
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.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.
Hemorrhagic Stroke ll: Pathophysiology
A hemorrhagic stroke develops when a cerebral blood vessel ruptures, allowing blood to escape into the surrounding brain tissue, as in intracerebral hemorrhage (ICH), or into the subarachnoid space, as in subarachnoid hemorrhage (SAH). Because the skull is a rigid compartment, the sudden presence of extravascular blood rapidly increases intracranial pressure and compresses adjacent neural structures, leading to immediate tissue injury and impaired cerebral perfusion.Mass Effect and Primary...
Cerebral Edema ll: Pathophysiology
Vasogenic edema is a major form of cerebral edema characterized by abnormal accumulation of fluid in the brain’s extracellular space due to disruption of the blood–brain barrier (BBB). The BBB is a specialized structure composed of endothelial cells connected by tight junctions, supported by astrocytic endfeet and a basement membrane. Under normal conditions, it tightly regulates the movement of ions, proteins, and solutes between the bloodstream and brain parenchyma. When this barrier loses...

