What is the technique, indications, and contraindications for endoscopic papillary balloon dilation (EPBD)?

Endoscopic Papillary Balloon Dilation (EPBD) Technique

EPBD is recommended as an adjunct to biliary sphincterotomy for facilitating removal of large common bile duct stones, but when used without prior sphincterotomy, it carries an increased risk of post-ERCP pancreatitis and should be reserved for specific clinical scenarios such as uncorrected coagulopathy or altered anatomy. 1

Technique

EPBD as Adjunct to Sphincterotomy

• Perform limited biliary sphincterotomy first, followed by balloon dilation to facilitate extraction of large stones 1
• This combined approach is becoming the preferred method among experts, potentially combining ease of use, safety, and efficacy 1
• The technique involves needle knife sphincterotomy over a straight plastic biliary stent or guidewire, followed by EPBD and conventional stone extraction 1

EPBD Without Prior Sphincterotomy

• Use an 8 mm diameter balloon when performing EPBD without prior sphincterotomy 1
• Balloon inflation duration should be at least 2 minutes to achieve adequate loosening of the papillary orifice 2, 3
• Inflate the balloon slowly, not exceeding the diameter of the bile duct or patient tolerance to prevent perforation 2
• Longer ballooning time does not increase pancreatitis risk but may reduce bleeding episodes in patients with coagulopathy 2

Technical Considerations

• Adequate dilation of the papillary orifice can reduce trauma to the papilla and pancreas during stone extraction with basket or lithotripter 2
• Avoid excessive ballooning and impractical cannulation attempts to prevent severe pancreatitis 4
• Consider precut sphincterotomy or adjuvant prophylaxis for pancreatitis prevention 4

Indications

Primary Indications

• Large common bile duct stones requiring facilitated removal when used as adjunct to sphincterotomy 1
• Uncorrected coagulopathy where bleeding risk from sphincterotomy is prohibitive 1, 5
• Difficult biliary access due to altered anatomy (e.g., Billroth II gastrectomy, Roux-en-Y gastric bypass) 1
• Patients taking warfarin, antiplatelet agents, or DOACs where bleeding risk is elevated 1, 5

Secondary Indications

• Unfavorable endoscopic anatomy for sphincterotomy 5
• When biliary sphincterotomy cannot be safely completed, limited sphincterotomy supplemented by EPBD is an alternative 1
• Stones less than 12 mm diameter can be effectively managed with EPBD alone 6

Contraindications and Cautions

Relative Contraindications

• EPBD without prior sphincterotomy is associated with increased post-ERCP pancreatitis risk (7.4% vs 4.3% with sphincterotomy alone) 5
• Large stones (>15 mm) have higher failure rates with EPBD alone and may require mechanical lithotripsy 6
• Approximately 20% of EPBD cases may require "rescue" sphincterotomy 5

Risk Mitigation Strategies

• In patients with high risk of post-ERCP pancreatitis from repeated pancreatic duct cannulation, insert a pancreatic stent in addition to administering rectal NSAID 1
• Consider placement of pancreatic stent and other measures to reduce pancreatitis risk when performing EPBD without sphincterotomy 3
• Ensure adequate biliary drainage is achieved; short-term biliary stent placement followed by further endoscopy or surgery is recommended if stones are not extracted 1

Clinical Outcomes

Efficacy

• EPBD shows similar efficacy and safety for choledocholithiasis removal compared to sphincterotomy when properly selected 4
• Bile duct clearance in one session: 78% with sphincteroplasty alone, with mechanical lithotripsy required in 10% for stones >12 mm 6
• EPBD combined with sphincterotomy results in fewer complications than sphincterotomy alone for bile duct stone removal 3

Safety Profile

• No papillary hemorrhage observed with EPBD (0% vs 2.0% with sphincterotomy) 5, 6
• Uncomplicated pancreatitis occurs in 5-7.4% of cases 5, 6
• Stone recurrence rate during median 16-month follow-up: 2% 6
• EPBD preserves sphincter of Oddi function, potentially reducing long-term complications such as stone recurrence, cholangitis, and cholecystitis 4

Important Caveats

• Pre-procedure coagulation studies (FBC and INR/PT) are required before biliary sphincterotomy or EPBD 1
• EPBD alone or with sphincterotomy are not sphincter-preserved procedures; regular follow-up is necessary for early detection and management of stone recurrence 2
• Competency in access papillotomy is suggested for all endoscopists performing ERCP, with appropriate training and mentorship 1