Dietary intervention in medically complex stone forming children with enteric hyperoxaluria

Area of Science:

• Pediatric Nephrology
• Urology
• Nutritional Science

Background:

• Medically complex, non-ambulatory children with neurocognitive disorders are at high risk for nephrolithiasis.
• Elevated urinary oxalate levels have been observed in recurrent stone-forming children consuming soy-based formulas.

Purpose of the Study:

• To determine if targeted dietary intervention can reduce urinary stone risk profiles in this vulnerable pediatric population.
• To assess the impact of dietary modification on urinary oxalate levels in non-ambulatory children with neurocognitive disorders.

Main Methods:

• Retrospective cohort study of non-ambulatory patients with cerebral palsy and/or severe developmental delay.
• Baseline 24-hour urine collections were performed, stratifying patients into high and low oxalate diets.
• Patients on high oxalate diets were transitioned to low oxalate diets, with repeated urinary profile assessments.

Main Results:

• Fourteen patients met inclusion criteria; four were on a baseline high-oxalate diet (median 67 mg/m²/day).
• After dietary modification, urinary oxalate decreased to 31 mg/m²/day, though not statistically significant (p=0.1).
• Calcium and phosphate indices remained unchanged.

Conclusions:

• This pilot study suggests urinary oxalate excretion can be modified in high-risk children through dietary changes.
• Further investigation with larger cohorts is required to confirm if dietary oxalate restriction reduces kidney stone formation.