The management of patients with enteric hyperoxaluria

Area of Science:

• Nephrology
• Gastroenterology
• Urology

Background:

• Enteric hyperoxaluria commonly follows intestinal surgery causing fat malabsorption.
• This leads to increased oxalate absorption, exceeding 100 mg/d, raising risks of kidney stones and oxalate nephropathy.
• Fat malabsorption reduces calcium available for oxalate binding and increases colonic permeability.

Purpose of the Study:

• To summarize the current understanding and management of enteric hyperoxaluria.
• To discuss the mechanisms of oxalate hyper-absorption in the context of fat malabsorption.
• To review current and potential future therapeutic strategies.

Main Methods:

• Literature review of studies on enteric hyperoxaluria, fat malabsorption, and oxalate nephropathy.
• Analysis of the pathophysiology linking intestinal conditions to hyperoxaluria.
• Evaluation of dietary, pharmacological, and probiotic interventions.

Main Results:

• Enteric hyperoxaluria results from increased intestinal oxalate absorption due to fat malabsorption.
• Reduced dietary calcium binding and increased colonic permeability contribute to hyperoxaluria.
• Current therapies include dietary modifications, calcium salts, and bile acid sequestrants.

Conclusions:

• Enteric hyperoxaluria is a significant complication of fat malabsorption requiring targeted management.
• Dietary interventions and oral oxalate binders are primary treatments.
• Further research into probiotics for oxalate degradation is ongoing.