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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.
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Two factors primarily cause thromboembolic conditions.
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Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

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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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Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
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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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Multiple Allele Traits01:49

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The Concept of Multiple Allelism
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Clot Retraction and Fibrinolysis01:16

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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.
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Related Experiment Video

Updated: Mar 17, 2026

Experimental and Imaging Techniques for Examining Fibrin Clot Structures in Normal and Diseased States
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Thrombin generation and cell-dependent hypercoagulability in sickle cell disease.

M F Whelihan1, M Y Lim1, M J Mooberry1

  • 1Department of Medicine, Chapel Hill, NC, USA.

Journal of Thrombosis and Haemostasis : JTH
|July 20, 2016
PubMed
Summary

Sickle cell disease (SCD) involves elevated whole blood thrombin generation, linked to erythrocyte phosphatidylserine exposure and acquired protein S deficiency. This suggests a cellular role in SCD hypercoagulability.

Keywords:
anemiaerythrocytephosphatidylserineprotein Ssickle cellthrombin

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A Precision Medicine Tool for Measurement and Monitoring of Hemoglobin S in Sickle Cell Disease Patients Receiving Transfusion Therapy
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Area of Science:

  • Hematology
  • Vascular Biology
  • Coagulation Science

Background:

  • Sickle cell disease (SCD) is characterized by a hypercoagulable state and increased thromboembolic events.
  • While plasma markers of coagulation activation are elevated, the role of global thrombin generation assays in SCD is debated.
  • Erythrocytes (RBCs) are increasingly recognized for their contribution to thrombin generation.

Purpose of the Study:

  • To investigate the role of cellular components, specifically phosphatidylserine-exposing erythrocytes, in enhanced thrombin generation in sickle cell disease (SCD).
  • To compare whole blood and plasma thrombin generation in SCD patients versus healthy controls.
  • To assess the protein C/S anticoagulant pathway and protein S activity in SCD.

Main Methods:

  • Performed whole blood and plasma thrombin generation assays on 25 SCD patients and 25 healthy controls.
  • Correlated thrombin generation with phosphatidylserine (PS) exposure on RBCs.
  • Assessed the protein C/S pathway using exogenous activated protein C and soluble thrombomodulin.

Main Results:

  • Whole blood thrombin generation was significantly elevated in SCD patients compared to controls.
  • Plasma thrombin generation was paradoxically reduced in SCD patients.
  • Elevated RBC phosphatidylserine exposure in SCD correlated with acquired protein S deficiency and reduced plasma thrombin generation.

Conclusions:

  • Increased phosphatidylserine exposure on RBCs in SCD is associated with acquired protein S deficiency.
  • A cellular contribution, beyond RBC PS exposure, likely explains elevated whole blood thrombin generation in SCD.
  • These findings highlight the complex procoagulant nature of SCD.