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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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Coagulation01:09

Coagulation

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The coagulation phase is a critical part of the body's process to prevent blood loss following injury to blood vessels. It involves chemical reactions that form a clot to seal the injured area. The clotting process begins shortly after injury, within 15-20 seconds for severe damage and 1-2 minutes for minor injuries.
During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...
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Coagulation01:06

Coagulation

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Introduction to Hemostasis01:05

Introduction to Hemostasis

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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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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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Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

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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...
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Updated: Apr 21, 2026

Author Spotlight: Modeling an Aspect of Preeclampsia in Female Mice Using Hypoxic Human Placenta-Derived Small Extracellular Vesicles
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Author Spotlight: Modeling an Aspect of Preeclampsia in Female Mice Using Hypoxic Human Placenta-Derived Small Extracellular Vesicles

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Coagulation and placenta-mediated complications.

Ian A Greer1, Anat Aharon2, Benjamin Brenner2

  • 1Faculty of Health & Life Sciences, University of Liverpool Foundation Building, Liverpool, UK;

Rambam Maimonides Medical Journal
|November 12, 2014
PubMed
Summary
This summary is machine-generated.

Pregnancy involves increased blood clotting risk, potentially causing venous thrombosis and placenta issues. Understanding thrombophilia is key to preventing serious pregnancy complications for maternal and fetal health.

Keywords:
Placenta-mediated complicationsrecurrent pregnancy lossthrombophilia

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Area of Science:

  • Obstetrics and Gynecology
  • Hematology
  • Reproductive Medicine

Background:

  • Pregnancy naturally induces a hypercoagulable state to manage delivery-related blood loss.
  • This physiological change elevates risks for venous thromboembolism and placenta-related complications.
  • Thrombophilia, both inherited and acquired, is linked to adverse pregnancy outcomes like recurrent miscarriage and early-onset pre-eclampsia.

Purpose of the Study:

  • To highlight the significance of placenta-mediated complications in pregnancy.
  • To underscore the association between thrombophilia and adverse gestational outcomes.
  • To advocate for research into pathophysiological mechanisms for improved management.

Main Methods:

  • Review of existing literature on pregnancy, hypercoagulability, and thrombophilia.
  • Analysis of the pathophysiology of placenta-mediated complications.
  • Emphasis on the need for prospective, stratified interventional studies.

Main Results:

  • Placenta-mediated complications affect up to 15% of pregnancies.
  • Hereditary and acquired thrombophilia are significant risk factors.
  • Current understanding of hemostatic alterations is crucial for management.

Conclusions:

  • Effective prevention of placenta-mediated complications is vital for women's health.
  • Further research into placental and systemic hemostatic mechanisms is warranted.
  • Stratified interventional studies will advance the management of high-risk pregnancies.