Gallstones with CBD Stones: Combined Management (ERCP + Cholecystectomy)

What are common bile duct (CBD) stones?

Common bile duct (CBD) stones, also called choledocholithiasis, are gallstones that have migrated from the gallbladder into the common bile duct. The CBD carries bile from the liver and gallbladder to the small intestine. When a stone obstructs the CBD, it causes serious complications: obstructive jaundice, cholangitis (bile duct infection), and gallstone pancreatitis. CBD stones are found in 5‑15% of patients with symptomatic gallstones. They cannot be treated by cholecystectomy alone – they require endoscopic or surgical extraction.

Symptoms of CBD stones – jaundice, dark urine, pancreatitis

Symptoms depend on the degree of obstruction and presence of infection:

• Obstructive jaundice: Yellow skin/eyes, dark urine (bilirubin), pale stools.
• Right upper quadrant pain (similar to biliary colic but may be more constant).
• Cholangitis (bile duct infection): Charcot’s triad – fever, jaundice, right upper quadrant pain. Reynolds’ pentad adds hypotension and altered mental status – a surgical emergency.
• Gallstone pancreatitis: Epigastric pain radiating to back, nausea, vomiting, elevated lipase.
• Elevated liver enzymes: Alkaline phosphatase (ALP), GGT, and bilirubin are raised. ALT/AST may be mildly elevated.

Diagnosis – ultrasound, MRCP, EUS, ERCP

Diagnosing CBD stones involves imaging and blood tests:

• Liver function tests (LFTs): Elevated alkaline phosphatase, GGT, and bilirubin suggest bile duct obstruction.
• Transabdominal ultrasound: May show a dilated CBD (>6‑8mm) but often fails to visualise stones directly (sensitivity 20‑30%).
• Magnetic resonance cholangiopancreatography (MRCP): Non‑invasive, highly sensitive (90‑95%) for CBD stones. The preferred initial imaging if suspicion is moderate.
• Endoscopic ultrasound (EUS): Very sensitive (95‑98%) for CBD stones, especially small stones (<5mm). Can be performed in the same session as ERCP.
• ERCP (endoscopic retrograde cholangiopancreatography): Both diagnostic and therapeutic. Gold standard. Direct visualisation of the bile duct and stone extraction.

Treatment options for CBD stones

Treatment depends on stone size, location, patient factors, and local expertise. Options include:

• ERCP with sphincterotomy and stone extraction: Gold standard for most CBD stones. Success rate 90‑95%.
• Laparoscopic common bile duct exploration (LCBDE): Performed at the same time as cholecystectomy. Suitable for large stones or when ERCP fails.
• Open common bile duct exploration: Rarely needed, for impacted stones or failed minimally invasive approaches.
• Percutaneous transhepatic cholangiography (PTC) with stone removal: For patients with altered anatomy (e.g., Roux‑en‑Y gastric bypass).
• Endoscopic papillary balloon dilation (EPBD): Alternative to sphincterotomy for small stones.

ERCP – the gold standard for CBD stone removal

ERCP is performed by a gastroenterologist. Steps:

1. Sedation or general anaesthesia.
2. Duodenoscope passed through mouth to the duodenum.
3. Cannulation of the ampulla of Vater.
4. Cholangiogram (contrast injection) to visualise stones.
5. Sphincterotomy (cutting the muscle) to enlarge the opening.
6. Stone extraction using a balloon or basket.
7. For large stones (>15‑20mm), mechanical lithotripsy or laser lithotripsy may be needed.
8. Balloon sweep to confirm clearance.
9. Stent placement (temporary) if stone extraction is incomplete or there is significant oedema.

Success rate: 90‑95% for stones <15mm. Complications: pancreatitis (3‑5%), bleeding (1‑2%), perforation (0.5%).

Laparoscopic common bile duct exploration (LCBDE)

LCBDE is performed by a surgeon during laparoscopic cholecystectomy. Access to the CBD can be through the cystic duct (transcystic) or directly through the CBD (choledochotomy).

• Transcystic LCBDE: A wire and basket are passed through the cystic duct into the CBD to retrieve stones. Suitable for stones <6‑8mm and a favourable cystic duct anatomy.
• Choledochotomy LCBDE: A direct incision is made in the CBD, stones are removed with a choledochoscope and basket. A T‑tube or primary closure is placed.

Success rate: 80‑95%. Advantages: single anaesthesia session, avoids ERCP. Disadvantages: longer operative time, higher bile leak risk (2‑5%). LCBDE is not available in all centres.

Timing of cholecystectomy – before, after, or same admission

After CBD stones are cleared, the gallbladder still contains stones and must be removed to prevent recurrence (30‑50% risk of recurrent CBD stones within 5 years if cholecystectomy is not performed). Options:

• Pre‑operative ERCP followed by cholecystectomy (most common): ERCP first to clear CBD, then laparoscopic cholecystectomy 2‑6 weeks later (or during the same admission).
• Same‑admission ERCP + cholecystectomy: ERCP on day 1, cholecystectomy on day 2‑3. Reduces hospital stay and costs. Preferred for fit patients.
• Intraoperative ERCP (laparoscopic‑assisted ERCP): Performed during cholecystectomy. Requires a mobile C‑arm and specialised equipment.
• LCBDE + cholecystectomy (single operation): One anaesthesia session. Ideal for patients with moderate‑sized stones and when ERCP is not available.

For patients with cholangitis or severe pancreatitis, ERCP is performed urgently, and cholecystectomy is delayed 2‑4 weeks.

Interactive FAQ – CBD stones and gallstones

Disclaimer: This information is for educational purposes. If you have gallstones and symptoms of CBD stones (jaundice, dark urine, fever), seek immediate medical attention at Vivekananda Hospital.