ERCP Procedure: Indications, Preparation, and Technique
ERCP is primarily a therapeutic procedure for biliary and pancreatic duct interventions, with diagnostic roles now largely replaced by less invasive imaging modalities like MRCP and EUS. 1
Indications for ERCP
Primary Indications (Strongest Evidence for Intervention)
The following conditions predict high diagnostic yield and therapeutic success 2:
- Cholangitis - predicts choledocholithiasis in 66% of cases
- Clinical evidence of biliary leak
- Acute biliary pancreatitis
- Abnormal intraoperative cholangiogram - predicts choledocholithiasis in 52% of cases
- Stent change or removal for benign or malignant disease
Secondary Indications (Require Multiple Criteria)
Only proceed when all three of the following are present 2:
- Pain attributable to biliary disease
- Imaging evidence of biliary disease
- Abnormal liver function tests
When all three criteria are met, there is statistically significant association with choledocholithiasis. Proceeding with fewer than three criteria increases risk of negative findings and adverse events.
Specific Therapeutic Applications
For chronic pancreatitis complications 3:
- Pancreatic duct stones ≤5 mm: Standard ERCP with sphincterotomy, dilation, and balloon/basket retrieval
- Pancreatic duct stones >5 mm: Extracorporeal shock wave lithotripsy (ESWL) with or without subsequent ERCP achieves >90% fragmentation and two-thirds complete clearance; alternatively, pancreatoscopy-directed lithotripsy when ESWL unavailable
- Pancreatic duct strictures: Stricture dilation with long-term stent placement (6-12 months) relieves pain in up to 85% of patients
- Biliary strictures from CP: Fully covered self-expanding metal stents (FCSEMS) preferred over multiple plastic stents due to reduced need for exchanges
Pre-Procedure Preparation
Risk Assessment
Evaluate the following high-risk factors 4:
Cardiopulmonary status:
- Chronic cardiopulmonary disease requires specific precautions
- Plan endoscopic sedation strategy based on comorbidities
- Consider monitored anesthesia care (MAC) over general anesthesia for most patients 5
Infection risk:
- Patients with biliary obstruction or suspected cholangitis require prophylactic antibiotics
- Post-procedure cholangitis occurs in <1% when properly managed 6
Pancreatitis risk factors:
- Identify patients at high risk for post-ERCP pancreatitis (PEP)
- Implement PEP prophylaxis measures per protocol 7
Equipment Selection
Guidewire selection is critical for successful cannulation 4:
- Choose appropriate guidewire material and tip configuration based on anticipated anatomy
- Have multiple guidewire options available for difficult cannulation scenarios
Technique
Cannulation Approach
Follow systematic escalation strategy 7:
- Initial attempt: Standard biliary cannulation technique
- Difficult access: Employ alternative cannulation methods per WEO guidelines
- Failed cannulation: Consider percutaneous or EUS-guided approaches
Sphincterotomy and Dilation
Technique selection depends on stone size and duct anatomy 3, 7:
- Standard sphincterotomy for routine access
- Papillary balloon dilation for specific indications
- Sequential upsizing for stricture remodeling
Special Circumstances 7
Address altered anatomy systematically:
- Periampullary diverticulum: Modified approach required
- Post-surgical anatomy: May require alternative access routes
- Duodenal stenosis: Consider EUS-guided alternatives if endoscopic access impossible
Adverse Events and Quality Metrics
Post-ERCP pancreatitis remains the most common complication 7, 6:
- Current rates: 2.3% clinical pancreatitis, 8.3% hyperamylasemia 6
- Implement pre-, intra-, and post-procedural PEP prophylaxis measures 7
Other complications 6:
- Cholangitis: <1% with appropriate technique
- Hemorrhage and perforation: rare with proper patient selection
- Unusual indications increase risk of unplanned hospitalization 2
Quality indicators to track:
- High cannulation success rate
- Low PEP rate
- These should be goals for all endoscopists 7
Critical Pitfalls to Avoid
- Do not proceed with ERCP based on single secondary criterion - wait until all three (pain, imaging, abnormal LFTs) are present to avoid unnecessary procedures and complications 2
- Do not use ERCP diagnostically when MRCP or EUS can provide the information non-invasively 1
- Do not attempt prolonged cannulation without escalating to alternative techniques - this increases PEP risk 7
- Do not forget antibiotic prophylaxis in patients with biliary obstruction or suspected cholangitis