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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.
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...
Venous Thrombosis III: Interprofessional Care01:29

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...
Venous Thrombosis II: Clinical Manifestations and Diagnostic Studies01:20

Venous Thrombosis II: Clinical Manifestations and Diagnostic Studies

The key difference between Superficial Vein Thrombosis (SVT) and Deep Vein Thrombosis (DVT) lies in their location and severity.Clinical ManifestationsSVT typically presents with localized pain, tenderness, and redness along the course of a superficial vein, often accompanied by a palpable, cord-like structure under the skin. This condition is usually less dangerous than DVT but can be uncomfortable and may lead to complications such as cellulitis or, rarely, a clot extension into the deep...
Anticoagulant Drugs: Vitamin K Antagonists and Direct Oral Anticoagulants01:18

Anticoagulant Drugs: Vitamin K Antagonists and Direct Oral Anticoagulants

Oral anticoagulants are vital tools in preventing and treating blood clotting disorders. This diverse class of medications can be categorized as vitamin K antagonists, exemplified by warfarin, and direct thrombin inhibitors (DTIs), such as dabigatran, as well as factor Xa inhibitors, including rivaroxaban.
Warfarin, a prominent vitamin K antagonist family member, exerts its effect by inhibiting the enzyme VKORC1 (vitamin K epoxide reductase complex 1). By hindering this enzyme, warfarin...
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...

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Related Experiment Video

Updated: Jun 1, 2026

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay
13:08

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

Published on: September 9, 2012

Factor VII Deficiency: A Rare Case Report.

Ramanath Mahale1, Pankaj Rathi, Chetan Ginegiri

  • 1Department of Pediatrics, Narayana Hrudayalaya Institute of Medical Sciences, Narayana Hrudayalaya Children's Hospital, Anekal Taluk, Bommasandra Indusrial Estate, Bangalore, India.

Indian Journal of Hematology & Blood Transfusion : an Official Journal of Indian Society of Hematology and Blood Transfusion
|June 2, 2011
PubMed
Summary
This summary is machine-generated.

Factor VII deficiency, a rare bleeding disorder, can be indicated by prolonged prothrombin time. This case highlights the critical need for prompt factor VII level testing in neonates presenting with sepsis and coagulopathy.

Keywords:
Congenital coagulopathyFactor VII deficiencyIntracranial hemorrhage

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Last Updated: Jun 1, 2026

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay
13:08

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

Published on: September 9, 2012

Tail Vein Transection Bleeding Model in Fully Anesthetized Hemophilia A Mice
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Tail Vein Transection Bleeding Model in Fully Anesthetized Hemophilia A Mice

Published on: September 30, 2021

Area of Science:

  • Hematology
  • Pediatrics
  • Genetics

Background:

  • Factor VII deficiency is a rare inherited bleeding disorder.
  • It is characterized by prolonged prothrombin time (PT) with a normal partial thromboplastin time (PTT).
  • Definitive diagnosis requires specific measurement of factor VII activity levels.

Observation:

  • A 20-day-old female infant presented with sepsis.
  • Initial hematological tests showed a prolonged PT and significantly low factor VII level (9%).
  • The infant received antibiotics and fresh frozen plasma (FFP).

Findings:

  • Clinical improvement was noted after FFP transfusion, but PT remained prolonged.
  • The patient experienced a fatal intracranial hemorrhage on the seventh day post-discharge.
  • This underscores the potential severity and complications of undiagnosed or inadequately treated factor VII deficiency.

Implications:

  • Early and accurate diagnosis of factor VII deficiency is crucial in neonates, especially those with sepsis.
  • Standard coagulation tests may not fully capture the bleeding risk in factor VII deficiency.
  • Prompt factor replacement therapy, guided by specific factor levels, is essential for managing bleeding events and preventing fatal outcomes.