Systemic vasculitis and the gut

Area of Science:

• Gastroenterology
• Rheumatology
• Immunology

Background:

• The gastrointestinal system is frequently implicated in primary and secondary vasculitides.
• Understanding the pathophysiology, clinical manifestations, and management of GI vasculitis is critical.

Purpose of the Study:

• To review recent data on the pathophysiology, clinical findings, diagnosis, management, and outcomes of gastrointestinal involvement in various vasculitides.
• To highlight diagnostic challenges and therapeutic strategies for GI vasculitis.

Main Methods:

• Literature review of recent data on gastrointestinal vasculitis.
• Analysis of diagnostic approaches, including imaging and serological markers.
• Evaluation of treatment outcomes for different types of vasculitis.

Main Results:

• Diagnosis is often challenging, relying heavily on imaging due to difficulties in obtaining adequate biopsy samples.
• Antineutrophilic cytoplasmic antibodies (ANCA) association with GI involvement in ANCA-associated vasculitis remains debated.
• Terminal ileitis in IgA vasculitis can mimic Crohn's disease; high fecal calprotectin indicates active GI disease in IgA vasculitis and Behçet's syndrome.
• Refractory Behçet's syndrome GI involvement may respond to thalidomide or TNF-α antagonists.
• Mesenteric vasculitis in systemic lupus erythematosus can improve with aggressive immunosuppression.

Conclusions:

• Gastrointestinal involvement is common in vasculitides like IgA vasculitis, ANCA-associated vasculitis, polyarteritis nodosa, and Behçet's syndrome, contributing significantly to morbidity and mortality.
• Treatment strategies involve high-dose corticosteroids and immunosuppressants, tailored to the specific vasculitis type.