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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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Formation of the Platelet Plug01:22

Formation of the Platelet Plug

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The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
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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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Structure and Function of Platelets01:18

Structure and Function of Platelets

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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...
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Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

8.0K
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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Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors01:20

Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors

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Antiplatelet drugs emerge as frontline defenders against the insidious threat of thromboembolic diseases, where abnormal clots obstruct vital blood vessels. These drugs stand as bulwarks, inhibiting platelet aggregation and clot formation, thereby mitigating the risk of life-threatening conditions like myocardial infarction, coronary artery disease, and thrombotic strokes.
Prostaglandin synthesis inhibitors, exemplified by the widely known aspirin, wield their power by irreversibly acetylating...
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Related Experiment Video

Updated: Dec 12, 2025

Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets
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Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets

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Thrombin generation abnormalities in Quebec platelet disorder.

Justin G Brunet1, Tanmya Sharma1, Subia Tasneem1

  • 1Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada.

International Journal of Laboratory Hematology
|August 8, 2020
PubMed
Summary
This summary is machine-generated.

Quebec platelet disorder causes a platelet-specific thrombin generation defect, linked to factor V deficiency. Tranexamic acid partially improves this defect, highlighting the importance of assessing both platelet-rich and platelet-poor plasma in bleeding disorders.

Keywords:
coagulationfactor Vfibrinolysisplatelet functionprocoagulant activity

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Investigating von Willebrand Factor Pathophysiology Using a Flow Chamber Model of von Willebrand Factor-platelet String Formation
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Area of Science:

  • Hematology
  • Thrombosis and Hemostasis

Background:

  • Calibrated automated thrombograms (CAT) offer insights into bleeding disorders using platelet-poor (PPP) and platelet-rich plasma (PRP).
  • Quebec platelet disorder (QPD) is characterized by a PLAU gene duplication, increasing platelet urokinase plasminogen activator (uPA) and leading to intraplatelet plasmin generation and factor V (FV) deficiency.

Purpose of the Study:

  • To assess thrombin generation (TG) in QPD using CAT.
  • To investigate the relationship between TG, platelet FV, platelet uPA, plasma FV, tissue factor pathway inhibitor (TFPI), and bleeding scores in QPD.

Main Methods:

  • CAT was performed on PPP and PRP from QPD patients (n=7) and controls (n=22).
  • Samples were tested with and without tranexamic acid (TXA).
  • TG endpoints were correlated with various laboratory parameters and bleeding scores.

Main Results:

  • QPD PPP showed normal TG, while QPD PRP exhibited reduced endogenous thrombin potential and peak thrombin concentrations.
  • QPD TG abnormalities were directly proportionate to platelet FV deficiency (R² ≥ 0.81) but not related to platelet uPA or plasma factors.
  • TXA improved TG in both QPD and control PRP but did not fully correct the QPD defect.

Conclusions:

  • QPD presents a platelet-specific TG defect secondary to platelet FV loss.
  • Assessing both PRP and PPP TG is crucial for understanding bleeding disorders like QPD.
  • TXA offers partial improvement for QPD-related TG defects.