6 results
Rapidly Progressive Glomerulonephritis (RPGN)
RPGN has three primary pathophysiologic causes differentiated by immunofluorescence

Immune Complex Mediated (granular staining):
Rapidly Progressive ... staining): • Low ... Complement: Post-strep ... GN, Lupus Nephritis ... differential #diagnosis #algorithm
Drug Induced Lupus vs SLE
Drug Induced Lupus (DIL):
 • Epidemiology: -10% of all lupus cases, drug-dependent,
Constitutional symptoms, Arthritis ... in >90% - Low ... complement - Rare ... complement - 50 ... #sle #comparison
SLE (Systemic Lupus Erythematosus)

Suspect:
Clinical evidence of (fatigue, rash, photosensitivity, inflammatory arthritis, weight loss, and fever) and
anti-Smith Ab, low ... complements and ... pneumonitis • Diffuse ... enteropathy, and diffuse ... , lymphopenia, low
Myositis and Myopathies
Polymyositis 
 • Progressive, symmetric muscle weakness 
 • Elevated CK, +Anti-Jo, +Anti-Mi2
Dermatomyositis
with temporal arteritis ... Body Myositis • Slow ... Myopathy • Diffuse ... uncommon 5-15% of lupus ... differential #diagnosis #comparison
Vasculitis and Vasculitides - Differential Diagnosis Framework

When to Consider Vasculitis:
 • Purpura, ischemic skin lesions
 •
, proteinuria, rapidly ... inflammation Others: • Lupus ... such as systemic lupus ... against MPO • Complement ... (Low levels mixed
Rheumatology Workup - Laboratories Studies in Rheumatic Diseases

• Septic arthritis - Gram stain and culture of
joint • Systemic lupus ... (3) Rises more rapidly ... Screening Tests for Diffuse ... Additional Tests for Diffuse ... chest wall, and low