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Related Concept Videos

Nephrotic Syndrome I : Introduction01:24

Nephrotic Syndrome I : Introduction

Nephrotic Syndrome is a chronic kidney disorder defined by clinical findings such as severe proteinuria, hypoalbuminemia, hyperlipidemia, and edema. These symptoms result from damage to the glomeruli, the kidney’s filtering units, increasing their permeability to proteins.Definition and Meaning:Proteinuria, defined as the loss of more than 3.5 grams of protein per day in adults, is a crucial feature of nephrotic syndrome. This condition is often accompanied by edema, the accumulation of fluid...
Hypersensitivity Reactions: Immune-Complex Reactions01:19

Hypersensitivity Reactions: Immune-Complex Reactions

Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum sickness, a systemic...
Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...
Portal Hypertension01:22

Portal Hypertension

Portal hypertension is an increase in blood pressure within the portal venous system. Normally, this pressure is less than 5 mmHg. It is considered clinically significant when it rises above 10 mmHg. At this threshold, complications from altered blood flow and venous congestion emerge.EtiologyPortal hypertension arises from conditions that impede blood flow through the liver. The most common cause is cirrhosis, in which chronic liver injury leads to fibrotic scarring. This fibrosis narrows or...
Hypersensitivities01:30

Hypersensitivities

Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
Types of Hypersensitivities
Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...
Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial exposure to a...

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Granulocyte-dependent Autoantibody-induced Skin Blistering
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Behçet's syndrome.

Yusuf Yazici1, Sebahattin Yurdakul, Hasan Yazici

  • 1New York University School of Medicine, New York University Hospital for Joint Diseases, New York, NY 10003, USA. yusuf.yazici@nyumc.org

Current Rheumatology Reports
|September 24, 2010
PubMed
Summary

Behçet's syndrome, a systemic vasculitis, presents with distinct clusters of symptoms, suggesting multiple underlying disease mechanisms. Current guidelines effectively manage non-vascular, neurological, and gastrointestinal aspects of this complex condition.

Area of Science:

  • Rheumatology
  • Vascular Medicine
  • Immunology

Background:

  • Behçet's syndrome is a systemic vasculitis of unknown cause.
  • It affects both small and large vessels in the venous and arterial systems.
  • Two main clusters of disease expression are recognized, indicating potential multifactorial origins.

Purpose of the Study:

  • To summarize the current understanding of Behçet's syndrome.
  • To highlight the distinct clinical presentations and potential underlying mechanisms.
  • To discuss the applicability of recent European League Against Rheumatism guidelines.

Main Methods:

  • Literature review and synthesis of existing knowledge on Behçet's syndrome.
  • Analysis of described disease expression clusters.

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  • Evaluation of current management guidelines in relation to disease complications.

    • Main Results:

    • Behçet's syndrome involves venous (e.g., thrombosis) and arterial complications.
    • Distinct clusters include thrombosis/thrombi and mucocutaneous/musculoskeletal symptoms (acne, arthritis, enthesitis).
    • These clusters suggest diverse pathological pathways.

    Conclusions:

    • The varied clinical manifestations of Behçet's syndrome point to complex, potentially multiple, disease mechanisms.
    • European League Against Rheumatism guidelines are valuable for managing non-vascular, non-neurological, and non-gastrointestinal manifestations.
    • Further research is needed for complications in vascular, neurological, and gastrointestinal systems due to limited controlled studies.