18 results
Causes of Hypocomplementemia - CHAMPS Mnemonic
C - Cryoglobulinemia (85%), C3 glomerulopathy, cirrhosis
H - Heavy Chain deposition
Causes of Hypocomplementemia ... glomerulonephritis, type ... 1 (50%-80%), type ... @AnnKumfer #Hypocomplementemia ... #Low #Complement
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
Hypersensitivity Types and Their Mechanisms
Type I - lgE - Soluble antigen
 - Allergen-specific lgE antibodies bind
II - IgG or IgM ... antigen, leading to complement ... Type Ill - IgG and ... Complement activation ... #Classification
Cryoglobulinemia Classification Types

Type 1: Monoclonal IgM (rarely IgG/lgA)
 • Raynaud phenomenon, Digital ulcers/gangrene, Livedo reticularis, Hyperviscosity
Cryoglobulinemia Classification ... and polyclonal IgG ... and polyclonal IgG ... and polyclonal IgG ... Cryoglobulinemia #Classification
IgG4-Related Disease
Clinical history:  Man, 60 years, multiorgan involvement, unique or multiple inflammatory pseudotumor
4 phenotypes:
 •
IgG4-Related Disease ... node), high serum IgG4 ... rheumatoid factor), ± hypocomplementemia ... with increased IgG4 ... Mettler_K1000 #IgG4
Summary table of types of hypersensitivity reactions. 
Type 1
 - Mediators: lgE
 - Antigen Form: Soluble
- Mediators: IgG ... Mechanism of Action: IgG ... antigens, leading to complement ... they activate complement ... allergy #table #classification
Types of hypersensitivity reactions

Type I - lgE-Mediated, Within I Hour (Anaphylaxis)
Type II - IgG or IgM
Types of hypersensitivity ... reactions Type ... (Anaphylaxis) Type ... II - IgG or IgM ... #Classification
IGG-4 RELATED DISEASE

WHAT?
 • A chronic, immune-mediated fibroinflammatory disease with tumefactive infiltration of IgG4+ plasma cells
IGG-4 RELATED DISEASE ... infiltration of IgG4 ... • Pancreas: Type ... - ↑ IgE, ↓ complement ... • Classification
Vasculitis and Vasculitides - Differential Diagnosis Framework

When to Consider Vasculitis:
 • Purpura, ischemic skin lesions
 •
often involved • Hypocomplementemic ... Urticaria and hypocomplementemia ... against MPO • Complement ... #rheumatology #classification
Hypersensitivity: Summary
Type I Hypersensitivity:
 • Immunological Mediator: lgE
 • Immunological Target: Allergen Molecules
 • Ex: Antibiotic
Hypersensitivity: Summary Type ... conjunctivitis Type ... Mediator: IgM + IgG ... Immunological Mediator: IgG ... #Classification