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Vasculitis and Vasculitides - Differential Diagnosis Framework

When to Consider Vasculitis:
 • Purpura, ischemic skin lesions
 •
Urticaria and hypocomplementemia ... inflammation Others: • Lupus ... such as systemic lupus ... against MPO • Complement ... #rheumatology #classification
Rapidly Progressive Glomerulonephritis (RPGN)
RPGN has three primary pathophysiologic causes differentiated by immunofluorescence

Immune Complex Mediated (granular staining):
staining): • Low Complement ... Post-strep GN, Lupus ... involvement: Anti-GBM Disease ... Glomerulonephritis #Vasculitis ... differential #diagnosis #algorithm
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
Cryoglobulinemia Summary

Cryoglobulins:
 • Cryoglobulins are Igs in the serum that precipitate in vitro at temperatures below
• Autoimmune diseases ... • Low serum C4 complement ... • Vasculitis ... (e.g. systemic lupus ... diagnosis #types #classification
Recommended initial testing for patients being evaluated for glomerular disease 

24-hour urine collection - Quantify proteinuria.
Recommended initial ... for glomerular disease ... or alternative complement ... for ANCA-related vasculitis ... glomerular #testing #workup
Recommended initial testing for patients being evaluated for glomerular disease
1) 24-hour urine collection - Quantify proteinuria.
Recommended initial ... or alternative complement ... for ANCA-related vasculitis ... #workup #diagnosis ... #initial #testing
Monoclonal Gammopathy of Renal Significance (MGRS)

MGRS
• MGRS refers to kidney disease caused by nephrotoxic monoclonal immunoglobulins
refers to kidney disease ... Diagnostic Workup ... guide subtype classification ... tubulopathy) - Complement ... formation causing vasculitis