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Related Concept Videos

Disorders of Hemostasis01:24

Disorders of Hemostasis

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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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Hemorrhagic Stroke ll: Pathophysiology01:29

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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...
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Portal Hypertension01:22

Portal Hypertension

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Portal hypertension is an increase in blood pressure within the portal venous system. Normally, this pressure is less than 5 mmHg. It is considered clinically significant when it rises above 10 mmHg. At this threshold, complications from altered blood flow and venous congestion emerge.EtiologyPortal hypertension arises from conditions that impede blood flow through the liver. The most common cause is cirrhosis, in which chronic liver injury leads to fibrotic scarring. This fibrosis narrows or...
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Venous Thrombosis I: Introduction01:30

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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...
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Introduction to Hemostasis01:05

Introduction to Hemostasis

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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,...
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Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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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...
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Related Experiment Video

Updated: May 4, 2026

Mass Isolation and In Vitro Cultivation of Intramolluscan Stages of the Human Blood Fluke Schistosoma Mansoni
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Interference with the host haemostatic system by schistosomes.

Mirjam M Mebius1, Perry J J van Genderen2, Rolf T Urbanus3

  • 1Department of Medical Microbiology and Infectious Diseases, Erasmus University Medical Center, Rotterdam, The Netherlands.

Plos Pathogens
|January 4, 2014
PubMed
Summary

Schistosomes, the cause of schistosomiasis, disrupt host hemostasis, leading to reduced coagulation. Understanding these parasitic interactions may reveal new drug targets for schistosomiasis and bleeding disorders.

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Cercarial Transformation and in vitro Cultivation of Schistosoma mansoni Schistosomules
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Area of Science:

  • Parasitology
  • Hematology
  • Tropical Medicine

Background:

  • Schistosomiasis, caused by schistosomes, affects 200 million people globally, with significant mortality in sub-Saharan Africa.
  • Adult schistosomes reside in host veins for decades, potentially influencing blood coagulation.
  • Schistosomiasis patients exhibit a hypocoagulable and hyperfibrinolytic state, indicating interference with the hemostatic system.

Purpose of the Study:

  • To review the interactions between schistosomes and host hemostasis, including primary and secondary hemostasis, fibrinolysis, and vascular tone.
  • To elucidate the mechanisms by which schistosomes reduce coagulation in infected individuals.
  • To identify potential therapeutic targets for schistosomiasis and related hemostatic disorders.

Main Methods:

  • Review of existing literature on schistosome interactions with the hemostatic system.
  • Analysis of the impact of schistosomes on blood flow, endothelial function, and coagulation.
  • Discussion of the implications for host survival and parasite propagation.

Main Results:

  • Schistosomes interfere with multiple aspects of the host's hemostatic system, leading to a hypocoagulable state.
  • Pathogen-induced hemostatic dysregulation is a common survival strategy for various infectious agents.
  • Schistosome molecules involved in modulating hemostasis present potential drug targets.

Conclusions:

  • Understanding schistosome-hemostasis interactions is crucial for developing novel anti-schistosome therapies and vaccines.
  • Schistosome-derived antithrombotic or thrombolytic molecules could be repurposed for treating hemostatic disorders.
  • Targeting host hemostasis mechanisms exploited by schistosomes may offer a broad strategy against blood-dwelling pathogens.