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Nephrology & Renal Medicine

Microscopic Polyangiitis (MPA)

ICD-10 Code
M31.7

Systemic necrotizing small-vessel vasculitis, strongly associated with MPO-ANCA (p-ANCA). Causes pauci-immune crescentic glomerulonephritis but, unlike GPA, generally lacks granulomatous inflammation.

Clinical Presentation & Protocol

Patient Usually Complains Of

Patient presents with progressive constitutional symptoms (fatigue, weight loss, fever) accompanied by rapidly progressive glomerulonephritis (RPGN) symptoms, including hematuria, proteinuria, and declining eGFR. Pulmonary involvement noted with symptoms of dyspnea, cough, or hemoptysis. No history of upper airway involvement (sinusitis/otitis) or granulomatous disease.

Clinical Examination Findings

General appearance: ill-appearing, pale, cachectic. Vitals: hypertension, tachycardia, low-grade pyrexia. Skin: palpable purpura, petechiae, or livedo reticularis on lower extremities. Lymph nodes: no significant lymphadenopathy.

Treatment Protocol

Induction therapy initiated with high-dose intravenous corticosteroids (methylprednisolone pulse) followed by oral prednisone taper. Concurrent immunosuppression with cyclophosphamide or rituximab. Renal protection via ACE inhibitors/ARBs if indicated. Prophylaxis for Pneumocystis jirovecii (PJP) with TMP-SMX.

Detailed clinical guide coming soon.