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[Granulomatosis with polyangiitis and microscopic polyangiitis].

Sebastian Klapa¹, Sabrina Arnold¹, Peter Lamprecht¹

¹Department of Rheumatology and Clinical Immunology, University of Lübeck, Lübeck, Germany.

Laryngo- Rhino- Otologie

|January 11, 2024

Summary

Granulomatosis with polyangiitis (GPA) and microscopic polyangiitis (MPA) are ANCA-associated vasculitides affecting small blood vessels. Diagnosis involves specific autoantibodies, with treatment tailored to disease severity and organ involvement.

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Area of Science:

Rheumatology and Immunology
Nephrology
Pulmonology

Background:

Granulomatosis with polyangiitis (GPA) and microscopic polyangiitis (MPA) are distinct forms of anti-neutrophil cytoplasmic autoantibody-associated vasculitis (AAV).
Both conditions involve systemic necrotizing small-vessel vasculitis, potentially affecting multiple organs.
GPA is uniquely characterized by extravascular necrotizing granulomatous inflammation, typically in the respiratory tract.

Purpose of the Study:

To differentiate the key pathological and clinical features of GPA and MPA.
To highlight the common organ systems affected in these ANCA-associated vasculitides.
To underscore the role of specific autoantibodies in the diagnosis and understanding of AAV.

Main Methods:

Review of clinical presentations and pathological findings in GPA and MPA.
Association of specific anti-neutrophil cytoplasmic autoantibodies (ANCA) with each disease entity.
Consideration of diagnostic markers including PR3-ANCA for GPA and MPO-ANCA for MPA.

Main Results:

The pulmonary-renal syndrome, featuring alveolar hemorrhage and rapidly progressive glomerulonephritis, is a dominant clinical manifestation in most AAV cases.
GPA frequently involves the upper respiratory tract, alongside respiratory and renal systems.
Specific ANCA profiles, namely PR3-ANCA for GPA and MPO-ANCA for MPA, are characteristic.

Conclusions:

GPA and MPA are distinct AAV entities with overlapping but also unique clinical and pathological features.
Diagnostic accuracy relies on recognizing characteristic organ involvement and specific ANCA types.
Therapeutic strategies for AAV require careful consideration of disease activity and the extent of organ damage.