Episode 211: Granulomatosis with Polyang...

Show Notes

Background

• A vasculitis affecting small blood vessels causing inflammation and necrosis
• Affects upper respiratory tract (sinusitis, otitis media, saddle nose deformity), lungs (nodules, alveolar hemorrhage), and kidneys (rapidly progressive glomerulonephritis)
• Can lead to multi-organ failure, pulmonary hemorrhage, renal failure

Red Flag Symptoms:

• Chronic sinus symptoms
• Hemoptysis (especially bright red blood)
• New pulmonary complaints
• Renal dysfunction
• Constitutional symptoms (fatigue, weight loss, fever)

Workup in the ED:

• CBC, CMP for anemia and AKI
• Urinalysis with microscopy (hematuria, RBC casts)
• Chest imaging (CXR or CT for nodules, cavitary lesions)
• ANCA testing (not immediately available but important diagnostically)

Management:

• Stable patients: Outpatient workup, urgent rheumatology consult, prednisone 1 mg/kg/day
• Unstable patients: High-dose IV steroids (methylprednisolone 1 g daily x3 days), consider plasma exchange, cyclophosphamide or rituximab initiation, ICU admission

Conditions that Mimic GPA:

• Goodpasture syndrome (anti-GBM antibodies)
• TB, fungal infections
• Lung malignancy
• Other vasculitides (EGPA, MPA, lupus)