13 results
Vasculitis and Vasculitides - Differential Diagnosis Framework

When to Consider Vasculitis:
 • Purpura, ischemic skin lesions
 •
often involved • Hypocomplementemic ... Urticaria and hypocomplementemia ... , drug reactions ... against MPO • Complement ... #rheumatology #classification
Summary table of types of hypersensitivity reactions. 
Type 1
 - Mediators: lgE
 - Antigen Form: Soluble
Summary table of ... , Haemolytic disease ... they activate complement ... types #allergy #table ... #classification
Rapidly Progressive Glomerulonephritis (RPGN)
RPGN has three primary pathophysiologic causes differentiated by immunofluorescence

Immune Complex Mediated (granular staining):
staining): • Low Complement ... Idiopathic • Normal Complement ... involvement: Anti-GBM Disease ... Glomerulonephritis #Vasculitis ... differential #diagnosis #algorithm
Vasculitis - Differential Diagnosis Framework

When to Consider Vasculitis:
• Purpura, ischemic skin lesions
• Mononeuritis multiplex
• Hematuria, proteinuria,
atherosclerotic disease ... , drug reactions ... most important diseases ... Elevated AST ALT • Hypocomplementemia ... ) • Hypocomplementemic
Hypersensitivity Types and Their Mechanisms
Type I - lgE - Soluble antigen
 - Allergen-specific lgE antibodies bind
during hemolytic disease ... Complement activation ... Hypersensitivity #Types #Classification ... Allergy #Diagnosis #Reactions ... #Table
Approach to Thrombocytosis - Elevated Platelet Count - Differential Diagnosis Algorithm

Peripheral Smear concerning for malignancy?
Differential Diagnosis Algorithm ... Rheumatologic, Vasculitides ... , IBD, Celiac disease ... syndrome, POEMS • Reaction ... Exercise, Allergic reactions
Causes of ileitis beyond Crohn’s disease and infections include systemic disorders -spondyloarthropathies, vasculitides, ischemia, and amyloidosis
beyond Crohn’s disease ... spondyloarthropathies, vasculitides ... See below for table ... helpful paper complements ... #Differential #Table
Cryoglobulinemia Summary

Cryoglobulins:
 • Cryoglobulins are Igs in the serum that precipitate in vitro at temperatures below
• Autoimmune diseases ... • Low serum C4 complement ... • IgA vasculitis ... • Vasculitis ... diagnosis #types #classification
SLE (Systemic Lupus Erythematosus)

Suspect:
Clinical evidence of (fatigue, rash, photosensitivity, inflammatory arthritis, weight loss, and fever) and
anti-Smith Ab, low complements ... Classification: ... ANCA-associated vasculitis ... • Mesenteric vasculitis ... RNP antibodies, Complement
IGG-4 RELATED DISEASE

WHAT?
 • A chronic, immune-mediated fibroinflammatory disease with tumefactive infiltration of IgG4+ plasma cells
IGG-4 RELATED DISEASE ... fibroinflammatory disease ... aortitis, mimics vasculitis ... - ↑ IgE, ↓ complement ... • Classification