Predictors of renal outcomes in crescentic and mixed class of ANCA-associated glomerulonephritis

Area of Science:

• Nephrology
• Immunology
• Pathology

Background:

• ANCA-associated glomerulonephritis (AAV-GN) encompasses diverse histological patterns.
• Crescentic and mixed patterns are common and impact renal prognosis.
• Predicting renal outcomes in these specific AAV-GN subtypes is crucial for patient management.

Purpose of the Study:

• To identify predictors of renal outcomes in patients with crescentic and mixed AAV-GN.
• To compare the prognostic utility of the ANCA renal risk score versus Berden's classification.

Main Methods:

• Systematic review of medical records for patients with AAV-GN from December 2008 to December 2018.
• Inclusion of 30 patients with crescentic AAV-GN and 40 with mixed AAV-GN.
• Analysis using Cox regression and log-rank tests; risk stratification using ANCA renal risk score.

Main Results:

• End-stage renal disease (ESRD) developed in 33.3% (crescentic) and 25% (mixed) of patients.
• No significant difference in renal survival between histological subgroups.
• Predictors of ESRD included older age, lower eGFR, fewer normal glomeruli, and more tubular atrophy/interstitial fibrosis.
• ANCA renal risk score effectively stratified patients into low, medium, and high risk for ESRD (p=0.024).

Conclusions:

• The ANCA renal risk score demonstrated superior prognostic value compared to Berden's classification.
• Clinical and histological factors significantly influence renal outcomes in crescentic and mixed AAV-GN.
• Risk stratification aids in predicting ESRD development in AAV-GN patients.