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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 I: Introduction01:30

Venous Thrombosis I: Introduction

Venous thrombosis, the most common disorder of the veins, involves the formation of a thrombus or blood clot associated with vein inflammation. It can be classified as either superficial vein thrombosis or deep vein thrombosis.Superficial Vein Thrombosis: This involves the formation of a thrombus in a superficial vein, usually the greater or lesser saphenous vein. Though less severe than deep vein thrombosis (DVT), SVT can lead to complications if untreated.Deep Vein Thrombosis (DVT): This...
Graves' Disease I: Introduction01:28

Graves' Disease I: Introduction

Graves' disease is an autoimmune disorder that causes hyperthyroidism, or overactivity of the thyroid gland. It results from autoantibodies called thyroid-stimulating immunoglobulins (TSIs), which bind to thyroid-stimulating hormone (TSH) receptors, leading to overstimulation of hormone production and a hypermetabolic state.EtiologyAlthough considered idiopathic, Graves’ disease has well-established contributing factors. There is a strong genetic component, with increased prevalence in...
Graves Disease II: Pathophysiology01:24

Graves Disease II: Pathophysiology

Graves’ disease is an autoimmune disorder characterized by the production of thyroid-stimulating immunoglobulins (TSI) that activate TSH receptors, leading to excessive synthesis and release of thyroid hormones (T3 and T4) and resulting in hyperthyroidism.Among all causes of hyperthyroidism, Graves’ disease is the most common and can happen at any age, though it is more frequent in women. It produces a hypermetabolic state with features such as weight loss, tachycardia, tremor, and heat...
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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Glanzmann's thrombasthenia: an overview.

Meganathan Kannan1, Renu Saxena

  • 1Department of Hematology, All India Institute of Medical Sciences, New Delhi, India.

Clinical and Applied Thrombosis/Hemostasis : Official Journal of the International Academy of Clinical and Applied Thrombosis/Hemostasis
|October 22, 2008
PubMed
Summary

Glanzmann's thrombasthenia (GT) is an inherited platelet disorder causing severe bleeding. Genetic defects in GPIIb/IIIa genes or their regulation cause GT, detectable through protein or gene analysis for carrier identification.

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Area of Science:

  • Hematology
  • Genetics
  • Molecular Biology

Background:

  • Glanzmann's thrombasthenia (GT) is an autosomal recessive inherited bleeding disorder characterized by defective platelet function.
  • The primary defect involves impaired platelet aggregation in response to physiological agonists, leading to significant bleeding manifestations.

Purpose of the Study:

  • To summarize the genetic basis and diagnostic approaches for Glanzmann's thrombasthenia.
  • To highlight the importance of carrier detection in managing inherited bleeding disorders.

Main Methods:

  • Review of genetic mutations in GPIIb and GPIIIa genes associated with GT.
  • Discussion of protein and direct gene analysis for carrier detection.
  • Identification of ethnic populations with high GT incidence.

Main Results:

  • GT results from mutations in GPIIb/IIIa genes or regulatory elements affecting their transcription.
  • Common bleeding signs include epistaxis, bruising, gingival, gastrointestinal, and genitourinary hemorrhage.
  • High GT prevalence is noted in specific ethnic groups with consanguinity.

Conclusions:

  • Genetic analysis of GPIIb/IIIa and regulatory elements is crucial for diagnosing GT.
  • Carrier detection through protein or gene analysis is vital for family planning and genetic counseling.
  • Understanding GT's genetic heterogeneity and population-specific incidence aids in disorder control.