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Related Concept Videos

Formation of the Platelet Plug01:22

Formation of the Platelet Plug

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...
Structure and Function of Platelets01:18

Structure and Function of Platelets

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 platelets, with...
Clot Retraction and Fibrinolysis01:16

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

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

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...
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...
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...

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Disruption of the Mouse Blood-Brain Barrier by Small Extracellular Vesicles from Hypoxic Human Placentas
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Platelet function in pre-eclampsia.

Rashid S Kazmi1, Alan J Cooper, Bashir A Lwaleed

  • 1Department of Haematology, Southampton University Hospitals NHS Trust, Southampton, UK. syed.kazmi@suht.swest.nhs.uk

Seminars in Thrombosis and Hemostasis
|March 4, 2011
PubMed
Summary
This summary is machine-generated.

Pregnancy involves significant hemostatic changes, increasing clotting risk. Platelet activation is heightened in pre-eclampsia, suggesting a role for antiplatelet agents in prevention.

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Area of Science:

  • Obstetrics
  • Hematology
  • Pathophysiology

Background:

  • Pregnancy is characterized by a shift towards hypercoagulability due to altered procoagulant and anticoagulant levels.
  • Platelet activation contributes to the prothrombotic state during pregnancy.
  • Pre-eclampsia (P-EC) is an obstetric complication associated with accentuated platelet activation.

Purpose of the Study:

  • To explore the role of platelet activation in pre-eclampsia.
  • To review methods for assessing platelet activation in pre-eclampsia.
  • To evaluate the diagnostic and predictive value of platelet activation markers.

Main Methods:

  • Review of existing studies on hemostasis and platelet function in pregnancy.
  • Analysis of techniques used to detect platelet activation in pre-eclampsia.
  • Examination of data on the predictive value of platelet activation for diagnosis.

Main Results:

  • Pregnancy significantly alters hemostasis, favoring a hypercoagulable state.
  • Platelet activation is demonstrably increased in pre-eclampsia.
  • Platelet function aberrations show predictive value for pre-eclampsia diagnosis.

Conclusions:

  • Platelet activation is a key contributor to the pathophysiology and clinical features of pre-eclampsia.
  • Assessing platelet activation may aid in the early diagnosis and risk prediction of pre-eclampsia.
  • Antiplatelet agents show promise for prophylaxis in high-risk pregnancies.