Pancreatic Guidewire-Assisted Fistulotomy Boosts Success in Difficult Biliary Cannulation: Study

Difficult biliary cannulation, particularly when compounded by the frustrating complication of unintentional pancreatic duct (PD) access, remains a formidable and potentially high-risk challenge even for the most seasoned endoscopic practitioners. Recognizing this critical clinical gap and the necessity for optimized salvage protocols, lead investigator Amir Sadeghi and an expert research team designed a rigorous prospective trial to meticulously evaluate the comparative safety and overall efficacy of two distinct advanced rescue methods: transpancreatic biliary sphincterotomy (TPBS) alongside the aforementioned fistulotomy approach.

Therefore, in the prospective, randomized, single-center clinical trial, out of 730 screened individuals, 194 patients experiencing difficult biliary access were randomized into two equal groups of 97 to compare successful cannulation rates. The study also monitored the patients for any procedure-related adverse events.

Key Clinical Findings of the Study Includes:

• Superior Cannulation Outcomes: The study demonstrated that the fistulotomy approach achieved a significantly higher biliary access success rate of 93.8% (91 patients) compared to the 81.4% (79 patients) success rate observed with the sphincterotomy technique. (p=0.01).

• Identified Failure Predictors: Research revealed that utilizing the sphincterotomy technique and possessing a normal common bile duct (CBD) diameter were both independently associated with an increased likelihood of unsuccessful cannulation.

• Comparable Safety Profiles: Analysis indicated that both advanced rescue techniques maintained remarkably similar safety profiles, with no statistically significant differences observed regarding overall adverse events (p=0.31).

• Specific Complication Rates: Evidence showed that post-endoscopic retrograde cholangiopancreatography (ERCP) pancreatitis occurred in 8.2% of the fistulotomy group and 4.1% of the sphincterotomy group, while post-procedural bleeding was exceptionally rare, noted in 0% and 2.1% of the patients, respectively.

The results suggest that for adult patients actively facing the anatomical hurdles of difficult biliary cannulation accompanied by inadvertent PD access, proactively deploying the fistulotomy rescue method delivers a significantly enhanced procedural success probability of 93.8% without imposing any additional generalized risk of procedure-related complications.

Thus, the study concludes that practicing endoscopists should consider gradually incorporating the guidewire-assisted fistulotomy approach as their preferred, frontline rescue intervention over traditional sphincterotomy when standard double-guidewire salvage techniques ultimately fail during complex biliary procedures.

While the inherent single-center design of this investigation gently suggests a natural need for subsequent, broader multicenter evaluations to fully confirm and generalize these promising outcomes, the current evidence undeniably provides a highly valuable, evidence-based foundation for refining advanced endoscopic rescue strategies worldwide.

Reference

Sadeghi, A., Arabpour, E., Rastegar, R., Hosseinzadeh, E., Mozafari Komesh Tape, P., & Zali, M. R. (2025). Pancreatic guidewire–assisted fistulotomy versus transpancreatic biliary sphincterotomy in difficult biliary cannulation with unintentional pancreatic duct cannulation: A randomized clinical trial. Indian Journal of Gastroenterology, 44, 862–871.