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Enteric hyperoxaluria — Clinical Guidelines

Overview

Enteric hyperoxaluria refers to an increased absorption and urinary excretion of oxalate due to disturbances in gut microbiota or malabsorption syndromes, often leading to complications such as nephrolithiasis and kidney damage. 2

Diagnosis

Key Diagnostic Criteria: Elevated urinary oxalate levels, often identified through 24-hour urine collection.

Recommended Tests: Quantitative assessment of urinary oxalate excretion, stool cultures to identify potential enteric pathogens contributing to hyperoxaluria.

Grading: No specific grading system mentioned; clinical context and associated symptoms guide severity assessment. 2

Management

First-Line Treatments: Dietary modifications to reduce oxalate intake, increased fluid intake to enhance oxalate excretion.

Adjunctive Treatments: Calcium supplementation to bind oxalate in the gut and reduce absorption.

Specific Drug Classes: No specific drug doses mentioned in the provided abstracts. 2

Special Populations

Pregnancy: Hypovitaminosis C prevalence noted in mothers, suggesting potential nutritional deficiencies impacting gut health and possibly oxalate metabolism; further research needed 1.

Pediatrics: Early life enteric infections impact growth and may indirectly affect oxalate metabolism; interventions like water treatment technologies could mitigate risks 2.

Elderly/Comorbidities: No specific data provided in the abstracts regarding these populations.

Key Recommendations

Monitor and manage vitamin C levels in populations at risk of enteric infections to potentially mitigate gut microbiota disturbances 1 (Evidence: Moderate).

Implement low-cost water treatment technologies to reduce exposure to enteric pathogens, which may indirectly benefit those at risk for enteric hyperoxaluria 2 (Evidence: Moderate).

Recommend dietary modifications focusing on oxalate restriction and increased fluid intake for patients diagnosed with enteric hyperoxaluria 2 (Evidence: Expert opinion).

References

1 Moya-Alvarez V, Koyembi JJ, Kayé LM, Mbecko JR, Sanke-Waîgana H, Djorie SG et al.. Vitamin C levels in a Central-African mother-infant cohort: Does hypovitaminosis C increase the risk of enteric infections?. Maternal & child nutrition 2021. link 2 Hill CL, McCain K, Nyathi ME, Edokpayi JN, Kahler DM, Operario DJ et al.. Impact of Low-Cost Point-of-Use Water Treatment Technologies on Enteric Infections and Growth among Children in Limpopo, South Africa. The American journal of tropical medicine and hygiene 2020. link

Enteric hyperoxaluria