Biliary Obstruction Management

Diagnostic Approach

The American Gastroenterological Association recommends using gamma-glutamyl transpeptidase (GGT) as the most reliable liver function test for common bile duct stones (CBDS), with sensitivity of 80.6% and specificity of 75.3% 1
Elevated bilirubin with cut-off of 22.23 μmol/L has sensitivity of 84% and specificity of 91% for CBDS, according to the European Society of Gastrointestinal Endoscopy 2
Abdominal ultrasound is recommended as first-line imaging to detect gallbladder stones, biliary dilatation, and common bile duct stones, with a sensitivity of 71-97% and specificity of 91%, as suggested by the American College of Radiology and the European Society of Gastrointestinal Endoscopy 2, 3
MRCP or EUS is recommended for evaluation of common bile duct (CBD) stones, with sensitivities of 85% and 93%, and specificities of 93% and 96%, respectively, according to the Tokyo Guidelines classification 4
CT scan is particularly useful in unstable patients with suspected malignancy or hepatic abscesses 4
Preoperative MRCP or EUS is recommended to evaluate for CBD stones in patients with gallbladder stones and moderate risk of CBD stones, according to the American Society for Gastrointestinal Endoscopy (ASGE) guidelines 1

The American College of Radiology recommends performing urgent biliary decompression within 24 hours via ERCP with sphincterotomy and stone extraction for patients with gallbladder obstruction and elevated liver function tests 2
If ERCP fails or is unavailable, the American College of Radiology suggests using percutaneous transhepatic biliary drainage (PTBD) as an alternative 2, 5
For confirmed CBDS, the European Society of Gastrointestinal Endoscopy recommends ERCP with sphincterotomy and stone extraction within 72 hours 2
For gallbladder obstruction without CBDS, the World Journal of Emergency Surgery recommends laparoscopic cholecystectomy as the definitive treatment 1
ERCP with endoscopic dilation with or without stent placement is the first-line treatment for biliary drainage, as recommended by the American Association for the Study of Liver Diseases 6
In case of ERCP failure, percutaneous transhepatic biliary drainage (PTBD) is recommended, while surgical open drainage should be considered only as a last resort, when endoscopic or percutaneous drainage is contraindicated or has failed, as suggested by the American Association for the Study of Liver Diseases 7

For distal malignant obstruction, the Journal of the American College of Radiology recommends ERCP with self-expandable metal stent placement 5
For hilar malignant obstruction, the Journal of the American College of Radiology suggests percutaneous internal/external biliary catheter is usually appropriate 5
For patients with coagulopathy (INR >2.0 or platelet count <60K) and dilated bile ducts, the Journal of the American College of Radiology recommends endoscopic internal biliary catheter with removable plastic stent 5
For patients with suspected sclerosing cholangitis, the American Association for the Study of Liver Diseases recommends ERCP or MRCP for diagnosis, and endoscopic balloon dilatation with or without stenting for dominant strictures causing symptoms 6
For patients with primary sclerosing cholangitis (PSC) and recurrent bacterial cholangitis not controlled by antibiotics, consider liver transplantation, as recommended by the American Association for the Study of Liver Diseases 8, 9

The Tokyo Guidelines classification recommends the following grades:
Grade Description
III (severe) Organ dysfunction
II (moderate) Risk of increasing severity without early biliary drainage
I (mild) Less severe cases
4
Empiric antibiotics should be started immediately, within 1 hour for septic shock, otherwise within 4 hours 4
Amoxicillin/Clavulanate 2g/0.2g q8h IV is recommended as the first-line treatment for acute cholangitis in immunocompetent patients by the World Journal of Emergency Surgery, Infectious Diseases Society of America, and other authorities 10, 8, 11
The duration of antibiotic therapy depends on the patient's condition, with 4 days recommended for immunocompetent patients with adequate control of the infection source, and up to 7 days for immunocompromised or critically ill patients, as recommended by the World Journal of Emergency Surgery and the American College of Emergency Physicians 10, 11, 10

Grade	Description
III (severe)	Organ dysfunction
II (moderate)	Risk of increasing severity without early biliary drainage
I (mild)	Less severe cases

Adequate biliary drainage is essential to prevent cholangitis, as suggested by the American Association for the Study of Liver Diseases 7
The American College of Radiology recommends immediate flushing of biliary drains in febrile patients to prevent progression to severe cholangitis and sepsis, particularly when the drain hasn't been flushed for two days, as recommended by the American College of Radiology 5
Obtaining bile samples for culture and sensitivity testing before or during the flush procedure is recommended by the American College of Radiology and BioScience Trends 5, 4
Incomplete biliary drainage is a risk factor for post-operative cholangitis, as suggested by the American Association for the Study of Liver Diseases 7
Data show that patients undergoing cholecystectomy after endoscopic clearance of bile duct stones have a significantly lower rate of cholangitis recurrence, as suggested by the World Journal of Emergency Surgery 11
Obesity may be an additional risk factor for cholangitis severity 4
Prolonged or recurrent antibiotic use increases the risk of developing resistant organisms, according to the Journal of Hepatology 8