Ileal resection/dysfunction in childhood predisposes to lithogenic bile only after puberty

Area of Science:

• Pediatric Gastroenterology
• Hepatology
• Biliary Physiology

Background:

• Children with ileal resection or dysfunction typically have bile that is not supersaturated with cholesterol.
• Previous studies indicated a lower risk of gallstones in these children during prepubertal stages.

Purpose of the Study:

• To investigate the changes in bile lipid composition and cholesterol saturation index in individuals with a history of ileal resection/dysfunction from infancy into adolescence.
• To assess the long-term risk of cholesterol cholelithiasis in this patient population.

Main Methods:

• Analysis of bile-rich duodenal aspirates from five postpubertal subjects (16-19 years) who were previously studied in childhood (4-9 years).
• Measurement of molar fractions of biliary lipids, including cholesterol and bile acids.
• Calculation of the cholesterol saturation index (CSI).
• Comparison of results with their own prepubertal samples and samples from healthy young adults.

Main Results:

• Postpubertal subjects showed a significantly higher proportion of biliary cholesterol (22.0% vs. 3.2-5.7%) and lower bile acids (58.1% vs. 78.2-79.7%) compared to prepubertal samples and controls.
• The cholesterol saturation index was significantly higher in postpubertal subjects (3.1 vs. 0.6-1.1).
• Gallstones were identified in one of the five subjects.

Conclusions:

• Children with ileal resection/dysfunction are not at significant risk for cholesterol gallstones before puberty.
• Bile supersaturation with cholesterol develops after puberty in these individuals, potentially predisposing them to gallstone formation in adulthood.
• Longitudinal monitoring of biliary lipid profiles is crucial for assessing gallstone risk in this population.