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Related Concept Videos

Disorders of Hemostasis01:24

Disorders of Hemostasis

679
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.
679
Introduction to Hemostasis01:05

Introduction to Hemostasis

5.0K
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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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...
3.8K
Structure and Function of Platelets01:18

Structure and Function of Platelets

952
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...
952
Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

4.8K
Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which...
4.8K
Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

592
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...
592

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Related Experiment Video

Updated: May 25, 2025

Evaluation of a Reliable Biomarker in a Cecal Ligation and Puncture-Induced Mouse Model of Sepsis
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Evaluation of a Reliable Biomarker in a Cecal Ligation and Puncture-Induced Mouse Model of Sepsis

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Thrombocytopenia in Sepsis.

Alireza Setarehaseman1, Abbas Mohammadi2, Robert W Maitta1

  • 1University Hospitals Cleveland Medical Center, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA.

Life (Basel, Switzerland)
|February 26, 2025
PubMed
Summary

Platelets play a critical role in sepsis-induced inflammation and thrombosis. Understanding their complex functions, including their involvement in thrombocytopenia, is key to developing new treatments for this life-threatening condition.

Keywords:
activationimmuneinfectionleukocytephagocytosisplateletssepsisthrombocytopenia

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Design of Cecal Ligation and Puncture and Intranasal Infection Dual Model of Sepsis-Induced Immunosuppression
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Cecal Ligation Puncture Procedure
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Evaluation of a Reliable Biomarker in a Cecal Ligation and Puncture-Induced Mouse Model of Sepsis
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Design of Cecal Ligation and Puncture and Intranasal Infection Dual Model of Sepsis-Induced Immunosuppression
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Area of Science:

  • Immunology
  • Hematology
  • Critical Care Medicine

Background:

  • Platelets are increasingly recognized for their roles beyond hemostasis, particularly in immune responses and inflammation.
  • Sepsis, a severe systemic inflammatory condition, is often associated with significant thrombocytopenia (low platelet count).
  • Platelets interact with leukocytes and endothelial cells, influencing the innate immune system during sepsis.

Purpose of the Study:

  • To review the complex roles of platelets in the inflammatory and thrombotic processes during sepsis.
  • To highlight the connection between platelet function, thrombocytopenia, and sepsis severity.
  • To identify potential therapeutic strategies targeting platelet activity in sepsis.

Main Methods:

  • Literature review of studies investigating platelet function in sepsis.
  • Analysis of the interplay between platelets, inflammation, and thrombosis in septic conditions.
  • Synthesis of current understanding regarding platelet-mediated mechanisms in sepsis.

Main Results:

  • Platelet activation and consumption contribute to thrombocytopenia and can worsen sepsis outcomes.
  • Platelets modulate inflammatory responses by interacting with various immune and endothelial cells.
  • Dysfunctional platelets exacerbate sepsis-related inflammation and thrombosis.

Conclusions:

  • Platelets are central mediators in sepsis, impacting inflammation, immunity, and thrombosis.
  • Targeting platelet activation and promoting platelet production are promising therapeutic avenues for sepsis with thrombocytopenia.
  • Further research into platelet dysfunction mechanisms in sepsis is needed for novel treatment development.