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Related Concept Videos

Hormonal Regulation01:33

Hormonal Regulation

The renin-aldosterone system is an endocrine system which guides the renal absorption of water and electrolytes, thus managing blood pressure and osmoregulation. Activation of the system begins in the kidneys with a small cluster of cells adjacent to the afferent and efferent blood vessels of the renal corpuscle. As the nephrons are filtering blood, juxtaglomerular cells monitor blood pressure. If they detect a decrease in pressure, they release the hormone renin into the bloodstream.
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...
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...
Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

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 forms a...
Vascular Spasm01:16

Vascular Spasm

The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last for...
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...

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Related Experiment Video

Updated: Jun 4, 2026

Disruption of the Mouse Blood-Brain Barrier by Small Extracellular Vesicles from Hypoxic Human Placentas
05:31

Disruption of the Mouse Blood-Brain Barrier by Small Extracellular Vesicles from Hypoxic Human Placentas

Published on: January 26, 2024

Hemostasis in pre-eclampsia.

Siti Khadijah Ismail1, John R Higgins

  • 1Anu Research Centre, Department of Obstetrics and Gynaecology, University College Cork, Cork University Maternity Hospital, Ireland. k.ismail@ucc.ie

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

Pre-eclampsia, a serious pregnancy disorder, involves abnormal blood clotting. Current treatments for women with inherited thrombophilia may need re-evaluation due to weak evidence linking thrombophilia to pre-eclampsia.

Related Experiment Videos

Last Updated: Jun 4, 2026

Disruption of the Mouse Blood-Brain Barrier by Small Extracellular Vesicles from Hypoxic Human Placentas
05:31

Disruption of the Mouse Blood-Brain Barrier by Small Extracellular Vesicles from Hypoxic Human Placentas

Published on: January 26, 2024

Area of Science:

  • Obstetrics and Gynecology
  • Hematology
  • Reproductive Medicine

Background:

  • Pre-eclampsia (P-EC) is a pregnancy-specific multisystem disorder affecting 2-8% of pregnancies.
  • It is a leading cause of maternal mortality and is characterized by a hypercoagulable state.
  • The uteroplacental circulation's hemostatic balance is vulnerable to disruption in P-EC.

Purpose of the Study:

  • To review the epidemiological link between inherited thrombophilia and pre-eclampsia.
  • To evaluate the current practice of using low molecular weight heparins in thrombophilia-positive women.
  • To highlight the need for further research into the hemostatic system's role in human placentation.

Main Methods:

  • Review of epidemiological data on inherited thrombophilia and P-EC.
  • Analysis of the hemostatic patterns in normal pregnancy versus P-EC.
  • Evaluation of the clinical evidence supporting low molecular weight heparin use.

Main Results:

  • A weak statistical association exists between inherited thrombophilia and P-EC, suggesting it is not a primary factor in pathogenesis.
  • Current evidence does not strongly support the widespread use of low molecular weight heparins to prevent P-EC recurrence in thrombophilia-positive women.
  • Abnormal hemostatic patterns are observed in the uteroplacental circulation during P-EC.

Conclusions:

  • The role of inherited thrombophilia in pre-eclampsia pathogenesis appears minimal.
  • The clinical practice of administering low molecular weight heparins for P-EC prevention in thrombophilia-positive women requires critical reassessment.
  • Future research should prioritize understanding the fundamental mechanisms of the hemostatic system in human placentation.