Post-infectious glomerulonephritis.

Area of Science:

• Pediatric Nephrology
• Infectious Diseases
• Immunology

Background:

• Post-infectious glomerulonephritis (PIGN) is a frequent cause of acute kidney injury in children.
• While post-streptococcal glomerulonephritis (PSGN) remains prevalent, non-streptococcal pathogens are increasingly identified as etiological agents, particularly in high-income nations.
• Key antigens like nephritis-associated plasmin receptor (NAPlr) and streptococcal pyrogenic exotoxin B (SPeB) are implicated in PSGN pathogenesis, activating the alternative complement pathway.

Purpose of the Study:

• To review the spectrum of causative agents in pediatric PIGN.
• To discuss the clinical presentation, diagnostic criteria, and management strategies for PIGN.
• To highlight the generally favorable prognosis of PIGN while noting indications for renal biopsy and long-term follow-up.

Main Methods:

• Literature review of PIGN, focusing on etiology, pathogenesis, clinical features, diagnosis, and management.
• Analysis of current evidence regarding treatment efficacy and indications for renal biopsy.
• Categorization of PIGN subtypes, including IgA-dominant nephritis, endocarditis-associated nephritis, and shunt nephritis.

Main Results:

• PIGN encompasses a wide range of causative agents beyond Streptococcus.
• Clinical manifestations vary widely, from asymptomatic cases to severe glomerulonephritis requiring dialysis.
• The alternative complement pathway is often activated, leading to reduced serum complement levels.

Conclusions:

• PIGN is a common pediatric condition with diverse etiologies, increasingly involving non-streptococcal organisms.
• Most cases are self-limiting with a good prognosis, though specific indications for renal biopsy exist.
• Specialized subtypes and the need for potential long-term follow-up underscore the complexity of PIGN management.