Prognosis of microscopic polyangiitis is well predictable in the first 2 weeks of treatment

Area of Science:

• Nephrology
• Rheumatology
• Internal Medicine

Background:

• Microscopic polyangiitis (MPA) patient outcomes are often unsatisfactory, necessitating tailored treatment intensity.
• Identifying severe cases early is crucial for improving patient prognosis.
• This study investigated factors influencing kidney and life outcomes in MPA patients.

Purpose of the Study:

• To identify predictors of poor kidney and life outcomes in microscopic polyangiitis (MPA).
• To determine if early kidney function markers can predict prognosis in MPA patients.

Main Methods:

• Retrospective study of 84 MPA patients diagnosed via myeloperoxidase-antineutrophil cytoplasmic antibody (MPO-ANCA) positivity and kidney biopsy.
• Poor prognosis defined as death, maintenance dialysis, or estimated glomerular filtration rate (eGFR) < 15 at 6 months.
• Analysis of factors associated with poor outcomes, including early eGFR measurements.

Main Results:

• 16.7% of patients experienced a poor prognosis, with 7.1% mortality and 9.5% poor kidney prognosis at 6 months.
• Estimated glomerular filtration rate (eGFR) at 2 weeks showed comparable prognostic performance to eGFR at 4 weeks (AUC 0.875 vs. 0.896).
• Adjusted analysis revealed a significant association between eGFR at 2 weeks and patient prognosis (p=0.031).

Conclusions:

• Kidney function assessed two weeks after treatment initiation for MPA can predict patient prognosis.
• Early eGFR measurements are valuable for identifying MPA patients at high risk for adverse outcomes.
• These findings support the use of early kidney function monitoring to guide treatment strategies in MPA.