List of fibrinogen disorders

Overview

Fibrinogen is a soluble plasma glycoprotein that is synthesized by the liver. It plays a critical role in the coagulation process, where it is converted by thrombin into fibrin, forming a clot. Disorders of fibrinogen can lead to either bleeding or thrombotic complications, depending on the nature of the disorder. These disorders can be congenital or acquired and are often classified based on the levels and functionality of fibrinogen in the blood.

Types of Fibrinogen Disorders

Fibrinogen disorders are generally categorized into three main types: afibrinogenemia, hypofibrinogenemia, and dysfibrinogenemia.

Afibrinogenemia

Afibrinogenemia is a rare genetic disorder characterized by the complete absence of fibrinogen in the blood. It is an autosomal recessive condition, meaning that an individual must inherit two defective copies of the gene responsible for fibrinogen production to manifest the disorder. Patients with afibrinogenemia typically present with severe bleeding episodes, including umbilical cord bleeding at birth, mucosal bleeding, and spontaneous joint and muscle hemorrhages.

Hypofibrinogenemia

Hypofibrinogenemia is a condition where there is a lower than normal level of fibrinogen in the blood. It can be inherited in an autosomal dominant or recessive manner. Individuals with hypofibrinogenemia may experience mild to moderate bleeding symptoms, although some may remain asymptomatic. The bleeding tendency is usually less severe than in afibrinogenemia.

Dysfibrinogenemia

Dysfibrinogenemia is characterized by the presence of structurally abnormal fibrinogen molecules that have impaired function. This condition can be inherited in an autosomal dominant pattern. Patients with dysfibrinogenemia may have a bleeding tendency, a thrombotic tendency, or both, depending on the nature of the fibrinogen abnormality. Some individuals may remain asymptomatic.

Acquired Fibrinogen Disorders

Acquired fibrinogen disorders can occur due to various conditions such as liver disease, disseminated intravascular coagulation (DIC), and certain medications. These conditions can lead to decreased production or increased consumption of fibrinogen, resulting in bleeding complications.

Diagnosis

The diagnosis of fibrinogen disorders typically involves a combination of clinical evaluation, family history, and laboratory testing. Laboratory tests may include:

• Fibrinogen activity test: Measures the functional activity of fibrinogen in the blood.
• Fibrinogen antigen test: Measures the amount of fibrinogen present in the blood.
• Genetic testing: Identifies mutations in the genes responsible for fibrinogen production.

Management

Management of fibrinogen disorders depends on the type and severity of the condition. Treatment options may include:

• Fibrinogen replacement therapy: Using fibrinogen concentrates or cryoprecipitate to replace missing or dysfunctional fibrinogen.
• Antifibrinolytic agents: Such as tranexamic acid, to prevent excessive bleeding.
• Regular monitoring and supportive care: To manage symptoms and prevent complications.

Related pages

• Coagulation disorders
• Thrombophilia
• Hemophilia
• Von Willebrand disease