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Related Concept Videos

Vascular Spasm01:16

Vascular Spasm

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The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last...
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Inflammatory Response I: Vascular and Cellular01:30

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The inflammatory response is the body's defense against infection, injury, or irritation from bacteria, trauma, toxins, or heat. Inflammation helps locate and destroy pathogens and remove damaged tissue elements to heal the body. During this initial phase, fluid, blood products, and nutrients migrate to the injured area, resulting in redness, heat, swelling, ache, and loss of function. Moreover, signs of systemic inflammation include fever, increased WBC count, malaise, anorexia, nausea,...
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Myocarditis I: Introduction01:21

Myocarditis I: Introduction

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Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...
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Endocarditis II: Clinical Features of Infective Endocarditis01:25

Endocarditis II: Clinical Features of Infective Endocarditis

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Endocarditis can present various clinical features depending on the causative organism and the patient's underlying health conditions. Initially, the clinical features of infective endocarditis develop gradually, presenting with nonspecific symptoms that can be easily mistaken for other illnesses.General SymptomsEarly symptoms of infective endocarditis are fever, chills, weakness, malaise, fatigue, and weight loss. These symptoms reflect the systemic nature of the infection and the body's...
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Pericarditis I: Introduction01:22

Pericarditis I: Introduction

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Pericarditis is defined as the inflammation of the pericardium, the thin, sac-like membrane surrounding the heart. This condition can cause significant chest pain and other symptoms, often necessitating medical intervention. The pericardium has two layers: the inner visceral layer and the outer parietal layer, separated by a small amount of fluid that reduces friction during heartbeats.Types of PericarditisPericarditis can be classified into several types based on the duration and nature of the...
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Endocarditis I: Introduction01:25

Endocarditis I: Introduction

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Introduction:Endocarditis is the infection of the endocardium, the inner lining of the heart and its valves. When the heart muscle is involved, the condition is termed myocarditis, while an infection of the outer lining is called pericarditis. Infective endocarditis (IE) primarily affects the endocardium, where pathogens adhere to the valves or lining, forming vegetation that can lead to severe complications. Infective endocarditis occurs when microorganisms, usually bacteria from other body...
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Related Experiment Video

Updated: Nov 1, 2025

An Immunohistopathologic Study to Profile the Folate Receptor Beta Macrophage and Vascular Immune Microenvironment in Giant Cell Arteritis
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IgA vasculitis.

Evangéline Pillebout1, Cord Sunderkötter2

  • 1Nephrology Unit, Saint Louis Hospital, INSERM 1149, CRI, 1 Av C. Vellefaux, 75010, Paris, France. evangeline.pillebout@aphp.fr.

Seminars in Immunopathology
|June 25, 2021
PubMed
Summary
This summary is machine-generated.

IgA vasculitis (IgAV) involves IgA deposition and neutrophil activation, causing inflammation in small vessels. Treatment varies from symptomatic care for mild cases to corticosteroids and immunosuppressants for severe IgAV, with prognosis linked to nephritis severity.

Keywords:
AdultsIgA NephropathyIgA vasculitisPurpuraSmall vessel vasculitis

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Area of Science:

  • Immunology
  • Nephrology
  • Rheumatology

Background:

  • IgA vasculitis (IgAV), also known as Henoch-Schönlein purpura, is a systemic vasculitis characterized by IgA deposition and neutrophil activation.
  • It can manifest as systemic disease, skin-limited IgAV, or IgA nephropathy, with systemic IgAV more common in children and potentially leading to chronic kidney disease in adults.
  • Key clinical features include palpable purpura, arthralgia, gastrointestinal issues, and glomerulonephritis, though other organ involvement is rare.

Purpose of the Study:

  • To summarize the pathophysiology, clinical presentation, and management of IgA vasculitis (IgAV).
  • To highlight the role of immune complexes containing galactose-deficient IgA1 in IgAV pathogenesis.
  • To discuss treatment strategies and prognostic factors for IgAV.

Main Methods:

  • Review of existing literature on IgA vasculitis (IgAV).
  • Analysis of the role of immune complexes and Fc alpha receptor (CD89) in disease mechanisms.
  • Evaluation of clinical features, treatment outcomes, and prognostic indicators.

Main Results:

  • Galactose-deficient IgA1 immune complexes activate neutrophils, leading to inflammation in cutaneous vessels and glomeruli.
  • Symptomatic treatment is recommended for self-limited IgAV.
  • Corticosteroids and immunosuppressants may benefit severe cases, but established treatments are lacking.

Conclusions:

  • IgA vasculitis (IgAV) pathogenesis involves specific immune complexes and neutrophil activation.
  • Prognosis is influenced by the severity of gastrointestinal and renal manifestations.
  • Further research is needed to establish definitive treatments for severe IgAV and nephritis.