Introduction: The aims of this retrospective multicentre study were to assess the technical success and adverse events of ERCP procedures in children in French and Belgian centres. Methods: All children aged one day to seventeen years who underwent ERCP between January 2008 and March 2019 in 15 tertiary care hospitals were retrospectively included. Results: 271 children underwent 470 ERCP procedures. Clinical long-term follow-up was available for 72% of our patients (340/470). The median age at intervention was 10.9 years. ERCP was therapeutic in 90% (423/470) and diagnostic in cases of neonatal cholestasis in 10% of the patients. The most common biliary indication was choledocholithiasis, and the most common pancreatic indication was chronic pancreatitis. Biliary cannulation was successful in 92% of cases (270/294); pancreatic cannulation, in 96% (169/176) of cases; and planned therapeutic procedures, in 91% (388/423) of cases. The overall complication rate was 19% (65/340). The most common complication was post-ERCP pancreatitis (PEP) in 12% (40/340) and sepsis in 5% (18/340) of cases. In the univariate analyses, pancreatic stent removal was protective against PEP (OR 0.1; 95% CI: 0.01-0.75, p=0.03), and sepsis was associated with liver transplantation history (OR 7.27, 95% CI: 1.7-31.05, p=0.01). Five patients had post-ERCP haemorrhage, and two had intestinal perforation. All complications were managed with supportive medical care. There was no procedure-related mortality. Conclusion: Our cohort demonstrates that ERCP can be performed safely with high success rates in many pancreaticobiliary diseases of children. The rate of adverse events was similar to that in previous reports.

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Nutrition appears to be an important environmental factor involved in the onset of inflammatory bowel diseases (IBD) through yet poorly understood biological mechanisms. Most studies focused on fat content in high caloric diets, while refined sugars represent up to 40% of caloric intake within industrialized countries and contribute to the growing epidemics of inflammatory diseases. Herein we aim to better understand the impact of a high-fat-high-sucrose diet on intestinal homeostasis in healthy conditions and the subsequent colitis risk. We investigated the early events and the potential reversibility of high caloric diet-induced damage in mice before experimental colitis. C57BL/6 mice were fed with a high-fat or high-fat high-sucrose or control diet before experimental colitis. In healthy mice, a high-fat high-sucrose diet induces a pre-IBD state characterized by gut microbiota dysbiosis with a total depletion of bacteria belonging to Barnesiella that is associated with subclinical endoscopic lesions. An overall down-regulation of the colonic transcriptome converged with broadly decreased immune cell populations in the mesenteric lymph nodes leading to the inability to respond to tissue injury. Such in-vivo effects on microbiome and transcriptome were partially restored when returning to normal chow. Long-term consumption of diet enriched in sucrose and fat predisposes mice to colitis. This enhanced risk is preceded by gut microbiota dysbiosis and transcriptional reprogramming of colonic genes related to IBD. Importantly, diet-induced transcriptome and microbiome disturbances are partially reversible after switching back to normal chow with persistent sequelae that may contribute to IBD predisposition in the general population.