Postoperative Biliary Stricture

Postoperative biliary stricture is narrowing of the bile duct or a bilioenteric anastomosis after surgery, most often cholecystectomy but also liver transplantation, hepatectomy and biliary reconstruction.

• Bile duct injury occurs in about 0.3 to 0.6 percent of laparoscopic cholecystectomies; mechanisms include misidentification of the common bile duct, thermal injury, clipping, tenting and ischaemia.
• Anastomotic strictures after liver transplant occur in 5 to 15 percent; ischaemic type biliary lesions (non-anastomotic) occur in 5 to 10 percent.
• Anastomotic strictures after hepaticojejunostomy occur in 10 to 20 percent.
• Classification is by distance from the hepatic confluence (high strictures within 2 cm are harder to repair), and by presence of injury to the right posterior duct or vascular supply.

Presents in the first postoperative days (bile leak, biloma, bile peritonitis with fever and pain) or weeks to years later (jaundice, pruritus, cholangitis, abnormal liver profile).

• Persisting bile drainage from a drain, rising bilirubin, ascites with bile, or jaundice after cholecystectomy should prompt investigation.
• Differential diagnosis: retained common bile duct stones, bile leak from cystic duct stump or duct of Luschka, hepatitis, drug-induced cholestasis, sepsis, primary biliary disease, sphincter of Oddi dysfunction, recurrent tumour.
• Complications: bile leak and biloma, bile peritonitis, recurrent cholangitis, hepatolithiasis, hepatic abscess, secondary biliary cirrhosis, portal hypertension, need for liver transplant, litigation and reduced quality of life.

Cholestatic liver profile (alkaline phosphatase, gamma-glutamyl transferase, bilirubin), INR, full blood count, CRP.

• Ultrasound (dilated ducts, collection), CT for collections, then magnetic resonance cholangiopancreatography (with hepatobiliary contrast for leak) to define stricture anatomy.
• Endoscopic retrograde cholangiopancreatography confirms leak and treats it; percutaneous transhepatic cholangiography defines proximal ducts when injured.
• Hepatic arteriography or CT angiography for vascular injury (hepatic artery pseudoaneurysm or occlusion).
• Exclude retained stones and tumour.

Supportive: resuscitation, fluids, nutrition, vitamin K 10 mg IV for coagulopathy, pruritus control (cholestyramine 4 g up to three times daily), early referral to a hepatobiliary unit.

Pharmacological

• Infected bile or cholangitis: piperacillin-tazobactam 4.5 g IV every 6 to 8 hours or ceftriaxone 2 g IV daily plus metronidazole 500 mg IV every 8 hours; continue 5 to 7 days after drainage.
• Biloma or leak with sepsis: broad spectrum antibiotics plus percutaneous drainage.
• Post-transplant ischaemic biliary lesions: ursodeoxycholic acid 15 mg/kg/day.

Procedures

• Bile leak: endoscopic sphincterotomy with a biliary stent (10 Fr plastic stent for 4 to 8 weeks) bridges leaks; percutaneous drainage of collections; surgical lavage and drainage for bile peritonitis.
• Intraoperative recognition: immediate repair by an experienced hepatobiliary surgeon (duct-to-duct anastomosis over a T-tube for minor lateral injury; Roux-en-Y hepaticojejunostomy for transection or loss of tissue).
• Late stricture (more than 6 weeks): endoscopic balloon dilation with multiple plastic stents or a fully covered metal stent for 12 months (success 70 to 90 percent in anastomotic strictures after transplant, about 60 to 80 percent for cholecystectomy injury).
• Percutaneous transhepatic balloon dilation and drainage for failure or inaccessible anatomy; surgical Roux-en-Y hepaticojejunostomy (long term success 80 to 90 percent) for complete obstruction, high strictures, failed endoscopic therapy, or associated vascular injury.
• Retransplant for end stage biliary cirrhosis or non-anastomotic strictures with graft loss.

Special groups: liver transplant recipients (early hepatic artery Doppler, cytomegalovirus screening), pregnancy (conservative drainage, defer reconstruction), elderly (stenting and drainage rather than major surgery).

Prevention: critical view of safety during cholecystectomy, bail out options (subtotal cholecystectomy, fundus-first technique, cholangiography), avoid indiscriminate thermal energy near the hepatoduodenal ligament.

Red flags: persistent bile drainage, fever with rigors, rising bilirubin, hepatic artery thrombosis, signs of peritonitis, hypotension.

Follow-up: liver profile every 3 months; cholangiography or MRCP at stent removal; annual review for 5 years to detect restenosis and secondary biliary cirrhosis.