Clinical presentation and long-term outcome of 144 patients with microscopic polyangiitis in a monocentric German...

Area of Science:

• Rheumatology
• Internal Medicine
• Clinical Immunology

Background:

• Microscopic polyangiitis (MPA) is a rare autoimmune disease characterized by inflammation of small blood vessels.
• Understanding the long-term outcomes and clinical presentation of MPA is crucial for effective patient management.
• Previous studies have reported varying disease severity and mortality rates across different patient cohorts.

Purpose of the Study:

• To evaluate the clinical presentation and long-term outcomes of microscopic polyangiitis (MPA) patients.
• To assess organ manifestations, treatment responses, chronic damage, and mortality in an MPA cohort.
• To identify factors associated with disease severity and patient outcomes.

Main Methods:

• Retrospective chart review of 144 MPA patients diagnosed and treated between 1991 and 2013.
• Classification of MPA using a modified European Medicines Agency algorithm.
• Standardized interdisciplinary approach for diagnosis and treatment with a median follow-up of 72 months.

Main Results:

• The overall standardized mortality ratio was 1.40, not statistically significant.
• Patients with MPA-associated fibrosing interstitial lung disease (ILD) and peripheral nervous system involvement at onset had significantly higher mortality.
• Initial treatment response was observed in 79.9% of patients, with 42.3% achieving complete remission and 37.5% partial remission. 13.9% had refractory disease.

Conclusions:

• MPA patients at this tertiary rheumatology referral center exhibited a less severe phenotype and better outcomes compared to other reported cohorts.
• Fibrosing interstitial lung disease (ILD) was identified as a significant predictor of mortality in this MPA cohort.
• The findings suggest that specialized care at referral centers may influence MPA disease course and outcomes.