Eosinophilic granulomatosis with polyangiitis

Area of Science:

• Rheumatology
• Immunology
• Pulmonology

Background:

• Eosinophilic granulomatosis with polyangiitis (EGPA) is a rare small to medium vessel necrotizing vasculitis.
• It is often classified with antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV), but ANCA positivity is infrequent in EGPA.
• Unique features include asthma and eosinophilia, distinguishing it from other vasculitides.

Purpose of the Study:

• To review the epidemiology, pathogenesis, clinical manifestations, diagnosis, treatment, and prognosis of EGPA.
• To highlight the diagnostic challenges and unique characteristics of EGPA.
• To discuss current treatment strategies and the need for improved therapies.

Main Methods:

• Literature review of epidemiology, pathogenesis, clinical features, diagnosis, treatment, and prognosis of EGPA.
• Analysis of diagnostic criteria and challenges, including the role of ANCA testing and tissue biopsy.
• Synthesis of information on treatment approaches based on disease severity and prognostic factors.

Main Results:

• EGPA is rare, with diagnosis often delayed due to evolving symptoms.
• Asthma and eosinophilia are hallmark features; polyneuropathies are common and may require aggressive immunosuppression.
• Cardiac involvement is the leading cause of mortality.

Conclusions:

• Effective treatment can control EGPA symptoms, but relapses are frequent, and prolonged corticosteroid use is often required, especially for asthma.
• Understanding EGPA's heterogeneity is crucial for developing more targeted and effective therapies.
• Further research is needed to improve long-term management and outcomes for patients with EGPA.