Primary hyperoxaluria type 1 in Tunisian children.

Area of Science:

• Nephrology
• Inborn errors of metabolism
• Pediatric nephrology

Background:

• Primary hyperoxaliuria type 1 (PH1) is an autosomal recessive disorder.
• Characterized by excessive urinary oxalate excretion, leading to calcium oxalate deposition.
• A significant cause of end-stage renal disease (ESRD) in certain populations, such as Tunisia.

Purpose of the Study:

• To review the clinical, biological, and radiological features of PH1.
• To correlate these features with the development of ESRD.
• To assess the impact of pyridoxine treatment on disease progression.

Main Methods:

• Retrospective review of 44 children with PH1 diagnosed between 1995 and 2009.
• Diagnosis confirmed by quantitative urinary oxalate excretion.
• Renal biopsy or infrared spectroscopy used for diagnosis in patients with renal impairment.

Main Results:

• The median age at diagnosis was 5.75 years, with 43% diagnosed before age 5.
• Nephrocalcinosis was universal; uraemia was the dominant initial symptom.
• 27% of patients presented with ESRD; 27% showed a positive response to pyridoxine.

Conclusions:

• PH1 commonly presents with nephrocalcinosis, urolithiasis, and renal failure.
• Early diagnosis and management are crucial for preventing ESRD.
• Pyridoxine sensitivity is linked to a more favorable prognosis in PH1 patients.