ERCP for Gallstones: Procedure, Recovery & Success Rates

What is ERCP? (Endoscopic Retrograde Cholangiopancreatography)

ERCP (Endoscopic Retrograde Cholangiopancreatography) is a specialised endoscopic procedure used to diagnose and treat problems of the bile ducts and pancreatic duct. For gallstones, it is the gold standard for removing stones that have migrated from the gallbladder into the common bile duct (choledocholithiasis). Unlike cholecystectomy (which removes the gallbladder), ERCP removes stones from the bile duct while leaving the gallbladder in place. It is performed by a trained gastroenterologist using a side‑viewing duodenoscope.

When is ERCP needed for gallstones?

ERCP is indicated when gallstones have migrated into the common bile duct, causing obstruction or complications. Indications include:

• Obstructive jaundice (yellow skin, dark urine, pale stools) with evidence of CBD stones on imaging.
• Acute cholangitis (fever, jaundice, right upper quadrant pain) – emergency ERCP.
• Gallstone pancreatitis (especially if severe or persistent obstruction).
• Elevated liver enzymes (ALP, GGT, bilirubin) with CBD dilation on ultrasound.
• Pre‑operative ERCP before cholecystectomy if CBD stones are known or suspected.

ERCP is not needed for uncomplicated gallbladder stones without bile duct involvement.

Step‑by‑step ERCP procedure

1. Preparation: Fasting for 6‑8 hours. Intravenous access established. Sedation (conscious sedation) or general anaesthesia given.
2. Endoscope insertion: The duodenoscope is passed through the mouth, oesophagus, stomach, and into the duodenum (first part of the small intestine).
3. Cannulation: The ampulla of Vater (where the bile duct and pancreatic duct open) is identified. A small plastic catheter is inserted into the bile duct.
4. Contrast injection (cholangiogram): Radiocontrast dye is injected to visualise the bile duct and confirm stone location, size, and number.
5. Sphincterotomy: A small cut (sphincterotomy) is made in the ampulla to enlarge the opening, allowing stone removal.
6. Stone extraction: A balloon or basket is passed into the bile duct to capture and remove stones. Small stones may be removed intact; larger stones may be fragmented with lithotripsy (mechanical or laser).
7. Final cholangiogram: Contrast is reinjected to confirm stone clearance and no residual stones.
8. Stent placement (if needed): A temporary plastic stent may be placed if stone removal is incomplete or there is significant ductal injury.

Total procedure time: 30‑90 minutes.

Success rates for common bile duct stone removal

ERCP is highly successful for CBD stone removal, especially for stones <15‑20mm:

• Overall stone clearance rate: 90‑95% after one session.
• For stones <10mm: 95‑98% clearance.
• For stones 10‑20mm: 85‑90% (may require lithotripsy).
• For stones >20mm or impacted: 70‑80% (may need multiple sessions or percutaneous approach).

Recovery after ERCP – what to expect

• Immediately after: You will be monitored in a recovery area for 1‑2 hours. Vital signs checked. You may have a sore throat from the endoscope.
• Same day: Most patients go home the same day if no complications. You may have mild abdominal bloating or discomfort.
• Day 1‑2: You can resume normal diet. Avoid heavy lifting or strenuous activity for 24 hours. Some patients have mild pancreatitis (nausea, abdominal pain) – usually resolves in 1‑2 days.
• Stent removal (if placed): Usually performed 2‑4 weeks later by repeat ERCP (quick procedure without sphincterotomy).
• Follow‑up: Cholecystectomy is often scheduled 2‑6 weeks after ERCP to prevent recurrent CBD stones.

Risks and complications of ERCP

ERCP is generally safe but carries higher risks than diagnostic endoscopy. Complication rates (overall 5‑10%):

• Post‑ERCP pancreatitis (3‑5%): The most common complication, usually mild but can be severe. Risk factors include younger age, difficult cannulation, and sphincterotomy.
• Bleeding (1‑2%): Usually from sphincterotomy site, often self‑limiting. May require endoscopic or angiographic control.
• Perforation (0.3‑0.6%): A rare but serious complication requiring surgery in some cases.
• Cholangitis or sepsis (0.5‑1%): Infection of the bile duct, treated with antibiotics.
• Cardiopulmonary events (sedation‑related).

ERCP vs laparoscopic cholecystectomy – difference

Patients often confuse ERCP with gallbladder removal. They are different:

• ERCP: Removes stones from the common bile duct (CBD), not the gallbladder. It does not prevent future gallstones. ERCP is often followed by cholecystectomy.
• Laparoscopic cholecystectomy: Removes the gallbladder itself, eliminating the source of stones. It does not remove stones already in the CBD – those require ERCP first.

In practice, patients with CBD stones often undergo ERCP first, then cholecystectomy 2‑6 weeks later (same admission sometimes).

Interactive FAQ – ERCP for gallstones

Disclaimer: This information is for educational purposes. ERCP is a specialised procedure. If you have symptoms of a common bile duct stone, consult a gastroenterologist at Vivekananda Hospital.