13 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
Types of hypersensitivity reactions

Type I - lgE-Mediated, Within I Hour (Anaphylaxis)
Type II - IgG or IgM
reactions Type ... (Anaphylaxis) Type ... II - IgG or IgM ... Complex-Mediated, 1-3 Weeks (Serum ... #Classification
IgG4-Related Disease
Clinical history:  Man, 60 years, multiorgan involvement, unique or multiple inflammatory pseudotumor
4 phenotypes:
 •
IgG4-Related Disease ... lymph node), high serum ... IgG4 concentration ... eosinophilia, ↑ serum ... rheumatoid factor), ± hypocomplementemia
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
Subtypes of Serum Proteins

Pre-albumin (Transthyretin)
Albumin
Globulins
 • Alpha-1: Alpha-1 antitrypsin, Serum amyloid A, Ceruloplasmin, Corticosteroid-binding globulin (Transcortin),
Subtypes of Serum ... • Gamma: IgM, IgG ... Proteins #Subtypes #algorithm ... #classification ... #Types #hematology
IGG-4 RELATED DISEASE

WHAT?
 • A chronic, immune-mediated fibroinflammatory disease with tumefactive infiltration of IgG4+ plasma cells
dysfunction • Serum ... • Pancreas: Type ... Labs: - ↑ Serum ... - ↑ IgE, ↓ complement ... • Classification
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
Hypersensitivity: Summary
Type I Hypersensitivity:
 • Immunological Mediator: lgE
 • Immunological Target: Allergen Molecules
 • Ex: Antibiotic
conjunctivitis Type ... Mediator: IgM + IgG ... Immunological Mediator: IgG ... glomerulonephritis, Serum ... #Classification
Cryoglobulinemia Summary

Cryoglobulins:
 • Cryoglobulins are Igs in the serum that precipitate in vitro at temperatures below
are Igs in the serum ... the presence of serum ... level • Low serum ... C4 complement level ... #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