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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: Jul 4, 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.

F Peyvandi1, M Cattaneo, A Inbal

  • 1A. Bianchi Bonomi Hemophilia and Thrombosis Center, Luigi Villa Foundation, IRCCS Maggiore Hospital, University of Milan, Milan, Italy. flora.peyvandi@unimi.it

Haemophilia : the Official Journal of the World Federation of Hemophilia
|June 25, 2008
PubMed
Summary
This summary is machine-generated.

This review discusses rare bleeding disorders (RBDs) caused by platelet defects or deficiencies in coagulation factors like fibrinogen and FXIII. Understanding these rare conditions is crucial for effective diagnosis and management.

Related Experiment Videos

Last Updated: Jul 4, 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

Area of Science:

  • Hematology
  • Genetics
  • Internal Medicine

Background:

  • Platelet plug formation and fibrin cross-linking are crucial for hemostasis.
  • Defects in platelets or coagulation factors (e.g., fibrinogen, FXIII) cause lifelong bleeding disorders.
  • Rare bleeding disorders (RBDs) have variable prevalence and poorly understood clinical aspects.

Purpose of the Study:

  • To review the main features, diagnosis, and treatment of platelet disorders.
  • To discuss fibrinogen and FXIII deficiencies, two specific rare bleeding disorders.
  • To present an update on the Rare Bleeding Disorders Database.

Main Methods:

  • Literature review of platelet function and coagulation factor deficiencies.
  • Discussion of molecular defects, clinical manifestations, and management strategies.
  • Presentation of updated data from the Rare Bleeding Disorders Database.

Main Results:

  • Platelet disorders arise from defects in receptors, granules, signaling, or phospholipids.
  • RBDs severity is heterogeneous for platelet issues and inversely related to factor deficiency levels.
  • Management and complications of these rare conditions require further elucidation.

Conclusions:

  • Comprehensive understanding of platelet disorders and specific RBDs is essential.
  • Accurate diagnosis and updated management strategies are critical for patients.
  • The Rare Bleeding Disorders Database provides valuable updated information for research and clinical practice.