Primary hyperoxaluria type 1 in children: Clinical classification, renal replacement therapy, and outcome in a single...

Area of Science:

• Pediatric Nephrology
• Rare Diseases
• Metabolic Disorders

Background:

• Primary hyperoxaluria type 1 (PH1) is a rare genetic disorder causing excessive oxalate production.
• This leads to nephrolithiasis, obstructive uropathy, and potentially end-stage kidney disease (ESKD).
• Understanding PH1 in pediatric ESKD is crucial for optimizing management.

Purpose of the Study:

• To analyze clinical presentations of PH1 in children with ESKD.
• To evaluate outcomes of different renal replacement therapy (RRT) modalities.
• To identify factors influencing morbidity and mortality in this cohort.

Main Methods:

• Observational cohort study of 22 pediatric patients with ESKD due to PH1.
• Data collected on clinical presentation, RRT (peritoneal dialysis, hemodialysis, transplantation), and outcomes.
• Statistical analysis to compare outcomes based on age of onset and RRT type.

Main Results:

• Infantile onset PH1 showed significantly worse renal and patient outcomes (80% ESRD at presentation, 40% mortality).
• Hemodialysis (HD) via arteriovenous fistula (AVF) and frequent HD improved dialysis adequacy.
• Infectious complications were high (42.8% in PD patients) and the primary cause of mortality (63.6% morbidity, 31.8% mortality).

Conclusions:

• Clinical presentation and outcomes of PH1 in pediatric ESKD vary with age of onset, with infantile cases being most aggressive.
• Optimized hemodialysis, particularly with AVF, is essential for adequate dialysis.
• Infection remains a major challenge and cause of mortality, even post-transplantation, highlighting the need for infection control strategies.