13 results
Pathophysiology of Hypocomplementemic Urticarial Vasculitis

C1q/anti-C1q antibiody ->
Immune Complex Formation - Complement Pathway Activation (C3a and C5a)
Pathophysiology ... of Hypocomplementemic ... Complex Formation - Complement ... TerrierBen #Hypocomplementemic ... #HUV #Pathophysiology
Hypersensitivity Types and Their Mechanisms
Type I - lgE - Soluble antigen
 - Allergen-specific lgE antibodies bind
antigen, leading to complement ... Type Ill - IgG and ... Complement activation ... glomerulonephritis, rheumatoid arthritis ... Classification #Pathophysiology
IgA Vasculitis – Henoch Scholein Purpura: Pathogenesis and Clinical Findings

 - Infectious Agents - 50% have
IgA Vasculitis – ... Activation of complement ... Leukocytoclastic vasculitis ... Arthralgia's (common), arthritis ... #Pathophysiology
Cryoglobulinemia Summary

Cryoglobulins:
 • Cryoglobulins are Igs in the serum that precipitate in vitro at temperatures below
Cryoglobulins are Igs ... arthralgia, and arthritis ... • Low serum C4 complement ... • IgA vasculitis ... SLE), rheumatoid arthritis
Vasculitis and Vasculitides - Differential Diagnosis Framework

When to Consider Vasculitis:
 • Purpura, ischemic skin lesions
 •
Schonlein Purpura (IgA ... and often causes arthritis ... often involved • Hypocomplementemic ... Urticaria and hypocomplementemia ... against MPO • Complement
Rapidly Progressive Glomerulonephritis (RPGN)
RPGN has three primary pathophysiologic causes differentiated by immunofluorescence

Immune Complex Mediated (granular staining):
three primary pathophysiologic ... staining): • Low Complement ... : IgA nephropathy ... Glomerulonephritis #Vasculitis ... differential #diagnosis #algorithm
Summary table of types of hypersensitivity reactions. 
Type 1
 - Mediators: lgE
 - Antigen Form: Soluble
- Mediators: IgG ... / IgM - Antigen ... antigens, leading to complement ... they activate complement ... Examples: Rheumatoid arthritis
Vasculitis - Differential Diagnosis Framework

When to Consider Vasculitis:
• Purpura, ischemic skin lesions
• Mononeuritis multiplex
• Hematuria, proteinuria,
GCA (Giant Cell Arteritis ... Schonlein Purpura (IgA ... , IgA (cmpkx deposits ... Elevated AST ALT • Hypocomplementemia ... ) • Hypocomplementemic
Type II Hypersensitivity: Pathogenesis and clinical findings
Definition: When antigens bind to the body's cell surfaces, forming
Type II Hypersensitivity ... , rarely IgM) against ... activates the complement ... cell surfaces #Type2 ... Allergy #Immunology #pathophysiology
Cold Agglutinin Disease

3 Types of Cold Sensitive Antibodies:
  1. Cold Agglutinins (CAD)
  2. Donath-Landsteiner
Agglutinin Disease 3 Types ... Cryoglobulins (Vasculitic ... Idiopathic monoclonal IgM ... Immunoglobulin M (IgM ... temperatures by fixing complement