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Disorders of Hemostasis

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.

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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...

Venous Thrombosis I: Introduction

Venous Thrombosis I: Introduction

Venous thrombosis, the most common disorder of the veins, involves the formation of a thrombus or blood clot associated with vein inflammation. It can be classified as either superficial vein thrombosis or deep vein thrombosis.Superficial Vein Thrombosis: This involves the formation of a thrombus in a superficial vein, usually the greater or lesser saphenous vein. Though less severe than deep vein thrombosis (DVT), SVT can lead to complications if untreated.Deep Vein Thrombosis (DVT): This...

Extrinsic and Intrinsic Pathways of Hemostasis

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...

Venous Thrombosis III: Interprofessional Care

Venous Thrombosis III: Interprofessional Care

Venous thrombosis requires effective prevention and treatment strategies to improve patient outcomes and reduce potential complications.Prevention StrategiesHealthcare providers must prioritize preventing venous thromboembolism (VTE) for all adult patients upon admission. Interventions depend on bleeding and thrombosis risk, medical history, current medications, diagnoses, planned procedures, and patient preferences. Patients on bed rest should change positions every two hours and, if not...

Clot Retraction and Fibrinolysis

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.

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Related Experiment Video

Updated: Mar 22, 2026

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay

Published on: September 9, 2012

[Congenital thrombophilia].

Tetsuhito Kojima¹

¹Department of Pathophysiological Laboratory Sciences, Nagoya University Graduate School of Medicine.

[Rinsho Ketsueki] the Japanese Journal of Clinical Hematology

|April 15, 2016

Summary

Congenital thrombophilia, a genetic blood clotting disorder, can be caused by novel mechanisms. A recent study identified a gain-of-function mutation in the prothrombin gene as a new cause of hereditary thrombosis.

Area of Science:

Hematology
Genetics
Molecular Biology

Context:

Congenital thrombophilia is a genetic disorder characterized by an increased tendency to form blood clots.
It often leads to venous thromboembolism at a young age, with a familial predisposition.
Known causes involve genetic defects in natural anticoagulant proteins like antithrombin, protein C, and protein S.

Purpose:

To investigate novel genetic causes of congenital thrombophilia.
To identify new mechanisms underlying hereditary thrombosis.

Summary:

This study reports a case of congenital thrombophilia resulting from a gain-of-function mutation in the prothrombin gene.
This mutation leads to a novel mechanism of antithrombin resistance, contributing to thrombosis.

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Ferric Chloride-induced Thrombosis Mouse Model on Carotid Artery and Mesentery Vessel

Ferric Chloride-induced Thrombosis Mouse Model on Carotid Artery and Mesentery Vessel

Published on: June 29, 2015

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Last Updated: Mar 22, 2026

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay

Published on: September 9, 2012

The Nijmegen Hemostasis Assay: Simultaneous Fluorogenic Measurement of Thrombin and Plasmin Generation in a Single Well

The Nijmegen Hemostasis Assay: Simultaneous Fluorogenic Measurement of Thrombin and Plasmin Generation in a Single Well

Published on: February 27, 2026

Ferric Chloride-induced Thrombosis Mouse Model on Carotid Artery and Mesentery Vessel

Ferric Chloride-induced Thrombosis Mouse Model on Carotid Artery and Mesentery Vessel

Published on: June 29, 2015

This finding expands the known genetic basis of hereditary thrombotic disorders.

Impact:

Identifies a new genetic cause for congenital thrombophilia.
Highlights the importance of investigating prothrombin gene mutations in unexplained thrombotic events.
Contributes to a better understanding of the genetic underpinnings of thrombophilia and hereditary thrombosis.