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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.
Disorders of Erythrocytes01:27

Disorders of Erythrocytes

Disorders of erythrocytes, or red blood cells (RBCs), include a range of conditions affecting their number, shape, or function.
Erythrocyte disorders can be broadly categorized into two main types: anemic and polycythemic conditions.
A low oxygen-carrying capacity of the blood due to the loss, lower production, or destruction of erythrocytes is termed anemia. Hemorrhagic anemia, for example, occurs when bleeding from an external wound or internal ulcer reduces erythrocyte counts.
On the other...
Esophageal Varices-II: Clinical Features and Management01:28

Esophageal Varices-II: Clinical Features and Management

Esophageal varices often manifest as gastrointestinal bleeding episodes, presenting symptoms like hematemesis (vomiting of blood), hematochezia (passing fresh blood via the rectum), and melena (black, tarry stools). Other signs can include weight loss, anorexia, abdominal discomfort, jaundice, pruritus, altered mental status, and muscle cramps.
In the initial assessment, a thorough review of the patient's medical history is vital to identify risk factors such as liver disease, alcohol abuse, or...
Blood Transfusion and Agglutination02:45

Blood Transfusion and Agglutination

Blood transfusion is a therapeutic measure to restore the blood volume after extensive blood loss due to an accident or a medical procedure. Blood transfusion involves drawing a certain amount of blood from a suitable donor and infusing it into the recipient.
History
The history of blood transfusion dates back to the 17th century, when early attempts were made in animals. In 1818 James Blundell, a British doctor, performed the first successful human blood transfusion. Later in 1900, Karl...
Hemorrhagic Stroke l: Introduction01:17

Hemorrhagic Stroke l: Introduction

A hemorrhagic stroke is an acute neurological event that occurs when a weakened cerebral blood vessel ruptures, allowing blood to accumulate within or around the brain. The sudden release of blood forms a focal hematoma that increases intracranial pressure, displaces neural tissue, and can obstruct cerebrospinal fluid pathways. These effects may be compounded by intraventricular extension of the hemorrhage, cerebral edema, or compression of adjacent structures, all of which contribute to...
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...

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Related Experiment Video

Updated: May 21, 2026

The Nijmegen Hemostasis Assay: Simultaneous Fluorogenic Measurement of Thrombin and Plasmin Generation in a Single Well
08:01

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

Published on: February 27, 2026

Rare bleeding disorders.

Flora Peyvandi1, Paula H B Bolton-Maggs, Angelika Batorova

  • 1A. Bianchi Bonomi Haemophilia and Thrombosis Center, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Università degli Studi di Milano and Luigi Villa Foundation, Milan, Italy. flora.peyvandi@unimi.it

Haemophilia : the Official Journal of the World Federation of Hemophilia
|June 26, 2012
PubMed
Summary
This summary is machine-generated.

Rare bleeding disorders (RBDs) involve inherited deficiencies in clotting factors. This review details advances in understanding FXI, FVII, and fibrinogen deficiencies, despite limited clinical data on their varied symptoms and management.

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Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells
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Last Updated: May 21, 2026

The Nijmegen Hemostasis Assay: Simultaneous Fluorogenic Measurement of Thrombin and Plasmin Generation in a Single Well
08:01

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

Published on: February 27, 2026

Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells
09:46

Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells

Published on: December 27, 2017

Area of Science:

  • Hematology
  • Genetics
  • Molecular Biology

Background:

  • Rare bleeding disorders (RBDs) encompass inherited deficiencies of coagulation factors like fibrinogen, Factor II, V, VII, XI, XIII, and FV+FVIII.
  • Advances in molecular profiling have enhanced understanding of the causes of these deficiencies.
  • Limited clinical data exists for RBDs due to their rarity, complicating the understanding of bleeding symptoms and management.

Purpose of the Study:

  • To review general features and recent advances in understanding three specific RBDs: Factor XI (FXI) deficiency, Factor VII (FVII) deficiency, and fibrinogen deficiency.
  • To highlight the heterogeneity of clinical manifestations in RBDs.
  • To discuss the challenges in predicting bleeding tendency based on residual factor levels.

Main Methods:

  • Literature review of existing studies on FXI, FVII, and fibrinogen deficiencies.
  • Synthesis of molecular and clinical data.
  • Analysis of current understanding of disease characteristics and management strategies.

Main Results:

  • Significant progress has been made in elucidating the molecular basis of FXI, FVII, and fibrinogen deficiencies.
  • Clinical presentations of RBDs are diverse and do not consistently correlate with measured factor levels.
  • Management strategies are evolving with increased understanding of these rare conditions.

Conclusions:

  • Further research is needed to bridge the gap between molecular understanding and clinical management of RBDs.
  • Improved characterization of bleeding symptoms and treatment outcomes is crucial for patients with FXI, FVII, and fibrinogen deficiencies.
  • This review provides a foundation for future studies on rare bleeding disorders.