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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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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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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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Venous Thrombosis III: Interprofessional Care01:29

Venous Thrombosis III: Interprofessional Care

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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...
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Anticoagulant Drugs: Vitamin K Antagonists and Direct Oral Anticoagulants01:18

Anticoagulant Drugs: Vitamin K Antagonists and Direct Oral Anticoagulants

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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...
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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: Sep 12, 2025

Author Spotlight: Deciphering Coagulation Disorders in Traumatic Brain Injury Patients
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Coagulation Disorders in Pregnancy.

Juliana Perez Botero1

  • 1Division of Hematopathology, Department of Laboratory Medicine and Pathology, Mayo Clinic.

Obstetrics and Gynecology Clinics of North America
|August 6, 2025
PubMed
Summary
This summary is machine-generated.

Pregnancy involves complex hemostatic changes, increasing risks for blood clots and bleeding. Careful risk assessment is crucial for managing coagulation disorders and planning delivery to ensure maternal and fetal well-being.

Keywords:
AnticoagulationBleeding disordersHypercoagulabilityPregnancyVenous thromboembolism

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

  • Obstetrics and Gynecology
  • Hematology
  • Reproductive Medicine

Background:

  • Coagulation disorders pose significant risks during pregnancy, leading to morbidity and mortality.
  • Physiologic hemostatic changes in pregnancy complicate laboratory interpretation and increase venous thromboembolism risk.
  • Hypercoagulability and bleeding evaluations are common in women of reproductive age.

Purpose of the Study:

  • To review the challenges in managing coagulation disorders during pregnancy.
  • To emphasize the need for risk stratification in anticoagulation therapy.
  • To highlight the complexities of delivery planning for patients with bleeding disorders.

Main Methods:

  • Literature review of hemostatic changes during pregnancy.
  • Analysis of current guidelines for anticoagulation and bleeding disorder management.
  • Discussion of multidisciplinary approaches to delivery planning.

Main Results:

  • Pregnancy inherently alters the hemostatic system, elevating thrombosis risk.
  • Anticoagulation can mitigate thrombosis risk but requires careful benefit-risk assessment.
  • Preventive antepartum management is typically reserved for severe bleeding disorders.

Conclusions:

  • Management of coagulation disorders in pregnancy necessitates a thorough understanding of hemostatic alterations.
  • Accurate risk stratification is essential for safe and effective anticoagulation.
  • Complex delivery planning involving multiple specialists is vital for optimizing maternal and fetal outcomes.