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Related Concept Videos

Disorders of Hemostasis01:24

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.
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...
Disorders of Erythrocytes01:27

Disorders of Erythrocytes

Disorders of erythrocytes, or red blood cells (RBCs), include a range of conditions affecting their number, shape, or function.
Erythrocyte disorders can be broadly categorized into two main types: anemic and polycythemic conditions.
A low oxygen-carrying capacity of the blood due to the loss, lower production, or destruction of erythrocytes is termed anemia. Hemorrhagic anemia, for example, occurs when bleeding from an external wound or internal ulcer reduces erythrocyte counts.
On the other...
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...
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...

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Related Experiment Video

Updated: May 21, 2026

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation
04:37

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation

Published on: May 23, 2025

Inherited platelet disorders.

A T Nurden1, K Freson, U Seligsohn

  • 1Centre de Référence des Pathologies Plaquettaires, Plateforme Technologique et d'Innovation Biomédicale, Hôpital Xavier Arnozan, Pessac, France. alan.nurden@u-bordeaux2.fr

Haemophilia : the Official Journal of the World Federation of Hemophilia
|June 26, 2012
PubMed
Summary
This summary is machine-generated.

Inherited platelet disorders cause bleeding due to impaired hemostasis. Diagnosis involves platelet function tests and genetic sequencing, with treatments ranging from transfusions to gene therapy.

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Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro
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Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro
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Microfluidic Flow Chambers Using Reconstituted Blood to Model Hemostasis and Platelet Transfusion In Vitro

Published on: March 19, 2016

Area of Science:

  • Hematology
  • Genetics
  • Molecular Biology

Background:

  • Inherited platelet disorders manifest as bleeding complications due to defective platelet hemostatic function.
  • These defects encompass issues with platelet adhesion, aggregation, secretion, activation, and procoagulant activity.
  • Some disorders, like Chediak-Higashi and Wiskott-Aldrich syndromes, involve molecular lesions affecting multiple cell types.

Purpose of the Study:

  • To provide a comprehensive overview of inherited platelet disorders, their underlying molecular mechanisms, diagnostic approaches, and therapeutic strategies.
  • To highlight the spectrum of platelet dysfunction, from receptor defects to production abnormalities like familial thrombocytopenia (FT).
  • To discuss the evolving diagnostic landscape and emerging treatment modalities for these conditions.

Main Methods:

  • Review of existing literature on inherited platelet disorders.
  • Analysis of diagnostic techniques including platelet function testing, flow cytometry, microscopy, and next-generation sequencing (e.g., whole exome sequencing).
  • Examination of current and investigational therapeutic interventions.

Main Results:

  • Platelet defects can involve adhesion (e.g., Bernard-Soulier syndrome), aggregation (e.g., Glanzmann thrombasthenia), and signaling pathways.
  • Familial thrombocytopenia (FT) and giant platelet syndromes (e.g., MYH9-related diseases) represent disorders of platelet production and megakaryocyte maturation.
  • Diagnosis relies on a combination of functional assays, receptor quantification, imaging, and genetic analysis.
  • Treatment strategies vary from supportive care (platelet transfusions, desmopressin) to advanced therapies (rFVIIa, thrombopoietin analogues, stem cell transplantation, gene therapy).

Conclusions:

  • Inherited platelet disorders are a heterogeneous group of diseases with diverse molecular bases and clinical presentations.
  • Accurate diagnosis is crucial and increasingly benefits from advanced genetic technologies.
  • Therapeutic options are expanding, offering improved management and potential cures for affected individuals.