General prognostic models may neglect vulnerable subgroups in ANCA-associated vasculitis

Area of Science:

• Nephrology
• Immunology
• Geriatrics

Background:

• ANCA-associated vasculitis (AAV) is a severe condition with higher incidence in the elderly.
• Limited research compares AAV characteristics and outcomes between elderly and younger patient groups.

Purpose of the Study:

• To compare clinical, histological, laboratory, and immunological features of AAV in elderly (≥65 years) versus younger patients.
• To analyze differences in mortality, renal recovery from dialysis, and estimated glomerular filtration rate (eGFR) at two years between age groups.

Main Methods:

• Retrospective analysis of a single-center renal biopsy cohort.
• Dichotomization of patients by age (≥65 years vs. <65 years).
• Evaluation of baseline characteristics and two-year outcomes.

Main Results:

• AAV was the most common kidney disease in elderly patients (20%).
• Overall mortality was 13.4% (19% in elderly vs. 4% in younger).
• Renal recovery from dialysis was achieved in 41% of elderly and 57% of younger patients; eGFR prediction accuracy differed significantly by age group.

Conclusions:

• Elderly and younger patients with AAV show comparable renal recovery and residual kidney function after two years.
• Predictive factors for AAV outcomes vary significantly between age groups.
• Age-specific models are necessary for accurate prognostication, particularly for patients over 80.