16 results
Hypersensitivity Types and Their Mechanisms
Type I - lgE - Soluble antigen
 - Allergen-specific lgE antibodies bind
- Local and systemic ... Type Ill - IgG and ... Complement activation ... arthritis, and systemic ... #Classification
Causes of Hypocomplementemia - CHAMPS Mnemonic
C - Cryoglobulinemia (85%), C3 glomerulopathy, cirrhosis
H - Heavy Chain deposition
Causes of Hypocomplementemia ... glomerulonephritis, type ... 1 (50%-80%), type ... glomerulonephritis (>90%) S - Systemic ... #Low #Complement
A System for Vasculitides 

#Diagnosis #IM #Rheum #Vasculitis #Small #Medium #Large #Vessel #Size #Classification #ANCA #Differential
A System for Vasculitides ... Diagnosis #IM #Rheum #Vasculitis ... #Vessel #Size #Classification ... #Differential #Algorithm
Cryoglobulinemia Summary

Cryoglobulins:
 • Cryoglobulins are Igs in the serum that precipitate in vitro at temperatures below
activate the immune system ... Types: • Type ... • Low serum C4 complement ... disorder (e.g. systemic ... #classification
Vasculitis and Vasculitides - Differential Diagnosis Framework

When to Consider Vasculitis:
 • Purpura, ischemic skin lesions
 •
often involved • Hypocomplementemic ... Urticaria and hypocomplementemia ... central nervous system ... against MPO • Complement ... #rheumatology #classification
Summary table of types of hypersensitivity reactions. 
Type 1
 - Mediators: lgE
 - Antigen Form: Soluble
- Mediators: IgG ... Mechanism of Action: IgG ... they activate complement ... glomerulonephritis, Systemic ... allergy #table #classification
IgG4-Related Disease
Clinical history:  Man, 60 years, multiorgan involvement, unique or multiple inflammatory pseudotumor
4 phenotypes:
 •
IgG4-Related Disease ... female, asian • Systemic ... node), high serum IgG4 ... rheumatoid factor), ± hypocomplementemia ... No necrosis, No vasculitis
Hypersensitivity: Summary
Type I Hypersensitivity:
 • Immunological Mediator: lgE
 • Immunological Target: Allergen Molecules
 • Ex: Antibiotic
conjunctivitis Type ... Mediator: IgM + IgG ... Immunological Mediator: IgG ... complexes • Ex: Systemic ... #Classification
IGG-4 RELATED DISEASE

WHAT?
 • A chronic, immune-mediated fibroinflammatory disease with tumefactive infiltration of IgG4+ plasma cells
IGG-4 RELATED DISEASE ... • Pancreas: Type ... aortitis, mimics vasculitis ... - ↑ IgE, ↓ complement ... • Classification
EULAR/ACR Classification Criteria for Systemic Lupus Erythematosus
Clinical Domains:
 • Constitutional domain: Fever
 • Cutaneous domain: Non-scarring
EULAR/ACR Classification ... Criteria for Systemic ... Anticardiolipin IgG ... or anti-ß2GPI IgG ... anticoagulant • Complement