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Vasculitis and Vasculitides - Differential Diagnosis Framework

When to Consider Vasculitis:
 • Purpura, ischemic skin lesions
 •
- Skin, glomeruli ... Urticaria and hypocomplementemia ... : - Kidneys: glomerular ... against MPO • Complement ... #rheumatology #classification
Acute Kidney Injury - Classification
Prerenal:
 • Dehydration
 • Heart failure (a.k.a. cardiorenal syndrome)
 • Liver failure
Kidney Injury - Classification ... - Small vessel vasculitis ... - TTP/HUS • Glomerular ... disease - Post-infectious ... Kidney #Injury #Classification
Recommended initial testing for patients being evaluated for glomerular disease 

24-hour urine collection - Quantify proteinuria.
disease 24- ... or alternative complement ... disease. ... for ANCA-related vasculitis ... #testing #workup
Vasculitis - Differential Diagnosis Framework

When to Consider Vasculitis:
• Purpura, ischemic skin lesions
• Mononeuritis multiplex
• Hematuria, proteinuria,
atherosclerotic disease ... most important diseases ... • Kidneys: Non-glomerular ... Elevated AST ALT • Hypocomplementemia ... ) • Hypocomplementemic
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
Recommended initial testing for patients being evaluated for glomerular disease
1) 24-hour urine collection - Quantify proteinuria.
disease 1) 24- ... or alternative complement ... for ANCA-related vasculitis ... #glomerular #disease ... #workup #diagnosis
Drug Induced Kidney Injury
 • Pre-Renal: NSAIDS, CNI, ACEI/ARB, IL-2 therapy, Diuretics CAR-T therapy
 • Osmotic
Vitamin C • Glomerular ... Disease: Drug induced ... vasculitis, TMA ... differential #diagnosis #algorithm
Hemolytic Anemia - Differential Diagnosis Algorithm
 • Sickle cells - Consider sickle cell disease (diverse genotypes):
Differential Diagnosis Algorithm ... Consider sickle cell disease ... cardiac valve, vasculitis ... Differential #Diagnosis #Algorithm ... #workup #hematology
IgG4-Related Disease
Clinical history:  Man, 60 years, multiorgan involvement, unique or multiple inflammatory pseudotumor
4 phenotypes:
 •
IgG4-Related Disease ... rheumatoid factor), ± hypocomplementemia ... No necrosis, No vasculitis ... IgG4 #Related #Disease ... management #phenotypes #workup
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