11 results
Pathophysiology of Hypocomplementemic Urticarial Vasculitis

C1q/anti-C1q antibiody ->
Immune Complex Formation - Complement Pathway Activation (C3a and C5a)
Pathophysiology of Hypocomplementemic ... antibiody -> Immune Complex ... Formation - Complement ... > Incr Immune Complex ... Pathophysiology #Rheumatology
Vasculitis and Vasculitides - Differential Diagnosis Framework

When to Consider Vasculitis:
 • Purpura, ischemic skin lesions
 •
tracts Immune Complex ... Urticaria and hypocomplementemia ... Coronary arteries - Fever ... : • Fevers • ... against MPO • Complement
Rapidly Progressive Glomerulonephritis (RPGN)
RPGN has three primary pathophysiologic causes differentiated by immunofluorescence

Immune Complex Mediated (granular staining):
immunofluorescence Immune Complex ... Glomerulonephritis • With associated ... Glomerulonephritis #Vasculitis ... differential #diagnosis #algorithm ... #rheumatology
ANCA-Associated Vasculitis
A group of necrotizing, small-vessel vasculitis without immune complex deposition. Complement levels are normal due
ANCA-Associated ... without immune complex ... Complement levels ... pattern (usually associated ... PR3 #Diagnosis #Rheumatology
Petechial/Purpuric Rashes- THE ALGORITHMIC APPROACH 

These rashes can be especially challenging and are
associated with devastating differential
challenging and are associated ... petechiae/purpura with fever ... petechiae/purpura with fever ... petechiae require complete ... #Diagnosis #Dermatology
Vasculitis - Differential Diagnosis Framework

When to Consider Vasculitis:
• Purpura, ischemic skin lesions
• Mononeuritis multiplex
• Hematuria, proteinuria,
: • Fevers • Fatigue ... : ANCA Associated ... pauci-immune GN Immune Complex ... Elevated AST ALT • Hypocomplementemia ... ) • Hypocomplementemic
Cryoglobulinemia Summary

Cryoglobulins:
 • Cryoglobulins are Igs in the serum that precipitate in vitro at temperatures below
deposit of immune complexes ... • Low serum C4 complement ... cytoplasmic antibody) associated ... associated with ... classification #rheumatology
Hemolytic Anemia - Differential Diagnosis Algorithm
 • Sickle cells - Consider sickle cell disease (diverse genotypes):
Differential Diagnosis Algorithm ... cardiac valve, vasculitis ... bartonella (oroya fever ... Differential #Diagnosis #Algorithm ... #workup #hematology
Causes of Petechial Rash - Differential Diagnosis Algorithm

Pinpoint areas (less than 2 mm) of hemorrhage, which
Differential Diagnosis Algorithm ... Infection - Vasculitis ... Red Flags: • Fever ... deficiency Work ... Up: • Complete
SLE (Systemic Lupus Erythematosus)

Suspect:
Clinical evidence of (fatigue, rash, photosensitivity, inflammatory arthritis, weight loss, and fever) and
weight loss, and fever ... anti-Smith Ab, low complements ... Diagnosis: • ANCA-associated ... Malignancy (e.g. hematologic ... to: Arthritis, Fever