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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.
Notch Signaling Pathway03:14

Notch Signaling Pathway

The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
Inflammatory Bowel Disease I: Ulcerative Colitis01:27

Inflammatory Bowel Disease I: Ulcerative Colitis

Introduction
Inflammatory bowel disease, or IBD, encompasses a group of disorders characterized by chronic inflammation or ulceration of the gastrointestinal tract.
Risk Factors
The exact cause of IBD remains unclear, although it is believed to be due to a mix of genetic, environmental, microbial, and immune factors. Genetic factors are significant in determining susceptibility to IBD, with family history being a critical risk factor. Individuals with a first-degree relative who has IBD are at...
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...
Epistaxis01:30

Epistaxis

Epistaxis, or nosebleeds, occurs when small, swollen blood vessels in the nasal mucous membrane rupture. Typically, the anterior septum is the primary site of occurrence.
Etiology
Possible causes of this condition include high blood pressure, trauma, low humidity, upper respiratory tract infections, allergies, foreign bodies, nasal inhalation of corticosteroids or illicit drugs, excessive use of decongestant nasal sprays, facial or nasal surgery, anatomic malformation, tumors, or systemic...
Venous Thrombosis IV: Nursing Management01:30

Venous Thrombosis IV: Nursing Management

Nursing management begins with a thorough assessment of the patient's health history. Key factors include trauma to veins, peripherally inserted central catheters, varicose veins, recent pregnancy or childbirth, surgery, bacteremia, prolonged bed rest, atrial fibrillation, COPD, heart failure, cancer, coagulation disorders, myocardial infarction, spinal cord injury, stroke, prolonged travel, recent bone fractures, and dehydration. Review medication intake, particularly oral contraceptives,...

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Updated: May 28, 2026

Tail Vein Transection Bleeding Model in Fully Anesthetized Hemophilia A Mice
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Tail Vein Transection Bleeding Model in Fully Anesthetized Hemophilia A Mice

Published on: September 30, 2021

Bleeding disorders in Noonan syndrome.

Benjamin J Briggs1, Joseph D Dickerman

  • 1Naval Medical Center San Diego, CA, USA. benjamin.briggs@med.navy.mil

Pediatric Blood & Cancer
|October 21, 2011
PubMed
Summary

Noonan Syndrome (NS) is a common genetic disorder often causing bleeding issues. This review details the genetics, prevalence, and management of bleeding complications in NS patients, crucial for surgical risk assessment.

Area of Science:

  • Genetics
  • Hematology
  • Pediatric Medicine

Background:

  • Noonan Syndrome (NS) is a prevalent genetic disorder characterized by multiple congenital anomalies.
  • Bleeding disorders are a significant, yet often underestimated, complication in NS patients.
  • Previous reviews on NS bleeding complications date back to 1997, necessitating an updated overview.

Purpose of the Study:

  • To review the current understanding of genetic factors contributing to bleeding disorders in NS.
  • To summarize the prevalence and etiologies of bleeding problems in Noonan Syndrome.
  • To provide recommendations for screening and management of bleeding risks in NS.

Main Methods:

  • Literature review of genetic associations and bleeding manifestations in Noonan Syndrome.

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Last Updated: May 28, 2026

Tail Vein Transection Bleeding Model in Fully Anesthetized Hemophilia A Mice
08:13

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Published on: September 30, 2021

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation
04:37

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation

Published on: May 23, 2025

  • Analysis of prevalence data and underlying causes of hemostatic defects.
  • Synthesis of current recommendations for clinical practice.

    • Main Results:

    • A significant proportion of NS patients (50-89%) experience bleeding disorders.
    • Specific gene mutations are increasingly linked to distinct bleeding phenotypes in NS.
    • Effective screening and management strategies are essential for patient safety, especially perioperatively.

    Conclusions:

    • Updated knowledge on NS genetics significantly clarifies bleeding disorder mechanisms.
    • Early identification and management of bleeding risks are critical for improving outcomes in NS.
    • This review provides a foundation for evidence-based guidelines in NS care.