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Enteric hyperoxaluria is a metabolic disorder resulting from conditions associated with fatty acid malabsorption and characterized by an increased urinary output of oxalate. Oxalate is excessively absorbed in the gut and then excreted in urine where it forms calcium oxalate crystals, inducing kidney stones formation and crystalline nephropathies. Enteric hyperoxaluria is probably underdiagnosed and may silently damage kidney function of patients affected by bowel diseases. Moreover, the prevalence of enteric hyperoxaluria has increased because of the development of bariatric surgical procedures. Therapeutic options are based on the treatment of the underlying disease, limitation of oxalate intakes, increase in calcium salts intakes but also increase in urine volume and correction of hypocitraturia. There are few data regarding the natural evolution of kidney stone events and chronic kidney disease in these patients, and there is a need for new treatments limiting kidney injury by calcium oxalate crystallization.
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http://dx.doi.org/10.1016/j.clinre.2024.102322 | DOI Listing |
Kidney360
August 2025
Mayo Clinic, Scottsdale, AZ, USA.
Background: Enteric Hyperoxaluria (EH) is a risk factor for calcium oxalate nephrolithiasis and kidney disease. The study compares patient characteristics and urine metabolic profiles at the time of EH diagnosis and kidney stones and end stage kidney disease (ESKD) events during follow-up in a cohort with diverse causes of EH.
Methods: Adult patients with newly documented elevated urinary oxalate excretion (UOX) >40 mg/24hr between 1/1/2010 to 10/31/2023 and a known enteric diagnosis including inflammatory bowel disease, Exocrine Pancreatic Insufficiency (EPI), Celiac disease, Structural Intestinal Malabsorption (SIM), or Malabsorptive Bariatric surgery (Bariatric) were identified.
J Pediatr Urol
June 2025
Pediatric Nephrology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.
Purpose: Medically complex, non-ambulatory children with neurocognitive disorders are particularly vulnerable to nephrolithiasis. Previous work has shown elevated urinary oxalate levels in recurrent stone forming children fed a soy-based protein formula. The purpose of this study is to determine if targeted dietary intervention can decrease urinary stone risk profiles in this patient population.
View Article and Find Full Text PDFUrol Clin North Am
August 2025
Department of Urology, University of Alabama at Birmingham, FOT 1120 1720 2nd Avenue South, Birmingham, AL 35294-3411, USA.
Hyperoxaluria is categorized as either primary (PH), enteric (EH), or idiopathic (IH). The PHs are a group of ultra-rare genetic disorders resulting in oxalate overproduction that can result in end-stage renal disease (ESRD). Novel RNA inhibitory drugs are now available to treat PH that significantly reduced the risk of kidney stones.
View Article and Find Full Text PDFKidney Int Rep
May 2025
Department of Urology, University of Alabama at Birmingham, Birmingham, Alabama, USA.
Introduction: Oxalate-degrading intestinal bacteria, including the oxalate-degrading specialist, have the potential to reduce urinary oxalate excretion in humans, and thus limit the risk of calcium oxalate kidney stone formation. The aim of this proof-of-concept study, which was performed in healthy adults, was to demonstrate that ingestion of live is safe, can establish sustainable gut colonization, and reduce urinary oxalate excretion.
Methods: Twenty-two healthy adults without a history of kidney stones and not colonized with ingested diets controlled in oxalate and calcium.