Choledocholithiasis

Etiology & Risks - Stone Stakes

• Primary CBD Stones: Form de novo in CBD; often brown pigment stones.
  • Causes: Biliary stasis, infection (e.g., E. coli, Ascaris), strictures, Caroli's disease.
• Secondary CBD Stones: Migrated from gallbladder; most common type. Usually cholesterol stones.

  ⭐ Secondary CBD stones, originating from the gallbladder, are the most frequent type, accounting for ~85% of cases.

• Risk Factors:
  • 📌 5 F's: Fat, Female, Forty (Age >40), Fertile, Family history.
  • Others: Hemolytic anemias (pigment stones), ileal disease/resection (↓bile salts), prolonged TPN, rapid weight loss.

Clinical Features - Bile Duct Blues

• Asymptomatic: Often incidental finding.
• Biliary Colic: RUQ/epigastric pain, radiates to R shoulder/scapula, post-prandial, esp. fatty meals.
• Jaundice: Obstructive (conjugated hyperbilirubinemia), dark urine, pale stools, pruritus.
• Fever & Chills: Suggests cholangitis.
• 📌 Charcot's Triad (Cholangitis): RUQ pain, fever, jaundice.
• 📌 Reynold's Pentad (Suppurative Cholangitis): Charcot's triad + hypotension + altered mental status.

⭐ Reynold's pentad indicates ascending cholangitis, a surgical emergency, and carries a high mortality rate if not promptly treated with biliary drainage and antibiotics.

• Nausea, vomiting.
• Pancreatitis (if stone obstructs pancreatic duct).

Investigations - Spotting Stones

• Initial: Transabdominal Ultrasound (USG)
  • Screens for gallstones, CBD dilatation (CBD >6mm, or >8-10mm post-cholecystectomy).

Imaging Modalities Comparison:

Management - Duct Clearance

• Endoscopic Retrograde Cholangiopancreatography (ERCP):
  • Diagnostic & therapeutic gold standard.
  • Procedure: Sphincterotomy (ES) + stone extraction (basket/balloon).
  • For stones <1.5 cm, multiple stones, cholangitis.
  • Large stones: Mechanical lithotripsy, stenting.
• Laparoscopic Common Bile Duct Exploration (LCBDE):
  • With cholecystectomy or standalone.
  • For stones >1.5-2 cm, failed ERCP, difficult papillary access.
  • Trans-cystic or choledochotomy approach.
• Open Common Bile Duct Exploration (Open CBDE):
  • Rarely first-line; for failed ERCP/LCBDE, very large/impacted stones.
  • T-tube placement common.

⭐ ERCP is the preferred first-line modality for most cases of choledocholithiasis as it is both diagnostic and therapeutic.

Complications & Prognosis - Aftermath Alert

• Post-ERCP Risks:
  • Acute pancreatitis (most frequent), hemorrhage, duodenal perforation, ascending cholangitis.
• Consequences of Untreated Stones:
  • Acute cholangitis (potentially septic), obstructive jaundice, pancreatitis.
  • Long-term: Secondary biliary cirrhosis, biliary strictures.
• General Outlook:
  • Favorable with prompt, successful stone removal.
  • Recurrence of stones: ~10-15% within 5 years.

  ⭐ Acute pancreatitis is the most common complication after ERCP, affecting 3-5% of individuals.

High‑Yield Points - ⚡ Biggest Takeaways

• Choledocholithiasis: Presence of gallstones within the Common Bile Duct (CBD).
• Most are secondary stones from gallbladder; primary CBD stones (pigment) linked to stasis/infection.
• Presents with obstructive jaundice, biliary colic; can lead to cholangitis (Charcot's triad/Reynold's pentad).
• MRCP is the gold standard non-invasive diagnostic tool; ERCP is diagnostic and therapeutic.
• ERCP with sphincterotomy and stone extraction is the first-line treatment.
• Key complications: Acute pancreatitis (post-ERCP), ascending cholangitis, biliary strictures.