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Vasculitis and Vasculitides - Differential Diagnosis Framework

When to Consider Vasculitis:
 • Purpura, ischemic skin lesions
 •
Vasculitis and Vasculitides ... often involved • Hypocomplementemic ... Urticaria and hypocomplementemia ... against MPO • Complement ... #rheumatology #classification
Cryoglobulinemia Summary

Cryoglobulins:
 • Cryoglobulins are Igs in the serum that precipitate in vitro at temperatures below
hematological disorders ... to Autoimmune Disorders ... • Low serum C4 complement ... connective tissue disorder ... diagnosis #types #classification
Cold Agglutinin Disease

3 Types of Cold Sensitive Antibodies:
  1. Cold Agglutinins (CAD)
  2. Donath-Landsteiner
Cryoglobulins (Vasculitic ... lymphoproliferative disorder ... infection, autoimmune disorder ... Positive Coombs testing ... temperatures by fixing complement
Recommended initial testing for patients being evaluated for glomerular disease 

24-hour urine collection - Quantify proteinuria.
Recommended initial testing ... C4 - Test for disorders ... or alternative complement ... for ANCA-related vasculitis ... #glomerular #testing
Hemolytic Anemia - Differential Diagnosis Algorithm
 • Sickle cells - Consider sickle cell disease (diverse genotypes):
Differential Diagnosis Algorithm ... cardiac valve, vasculitis ... Consider RBC membrane disorder ... Differential #Diagnosis #Algorithm ... workup #hematology #testing
Recommended initial testing for patients being evaluated for glomerular disease
1) 24-hour urine collection - Quantify proteinuria.
Recommended initial testing ... C4 - Test for disorders ... or alternative complement ... for ANCA-related vasculitis ... diagnosis #initial #testing
SLE (Systemic Lupus Erythematosus)

Suspect:
Clinical evidence of (fatigue, rash, photosensitivity, inflammatory arthritis, weight loss, and fever) and
anti-Smith Ab, low complements ... Skin Disease Classification ... ANCA-associated vasculitis ... ) • Endocrine disorders ... RNP antibodies, Complement
Monoclonal Gammopathy of Renal Significance (MGRS)

MGRS
• MGRS refers to kidney disease caused by nephrotoxic monoclonal immunoglobulins
or plasma cell disorder ... guide subtype classification ... tubulopathy) - Complement ... formation causing vasculitis