What is Cholangitis?
Cholangitis is an infectious disease characterized by acute inflammation and infection of the bile ducts resulting from a combination of biliary obstruction and bacterial growth in bile. 1
Pathophysiology
Cholangitis develops when bacteria invade the biliary system in the setting of biliary obstruction. Bacteria reach the biliary tree either by:
- Ascending from the intestine
- Through the portal venous system 1
The critical point is that cholangitis does not occur without biliary obstruction - experimental and clinical models demonstrate that obstruction is the essential predisposing factor. 2
Common Causes
The most common cause of cholangitis is choledocholithiasis (bile duct stones) 1, though other causes include:
- Malignant biliary obstruction
- Biliary strictures (benign or malignant)
- Biliary stents (a major risk factor for bacterial colonization)
- Primary sclerosing cholangitis (PSC) with high-grade strictures 3
Clinical Presentation
Classic Features
The traditional presentation includes Charcot's triad:
- Fever
- Jaundice
- Right upper quadrant abdominal pain 2
However, this triad has insufficient sensitivity, and the clinical presentation varies widely from mild to life-threatening. 4
Diagnostic Criteria
The diagnosis requires clinical signs, laboratory findings, and imaging evidence:
Clinical signs: Fever, jaundice, chills, and RUQ abdominal pain
Laboratory findings:
- Indicators of inflammation (elevated WBC, CRP)
- Evidence of biliary stasis (elevated alkaline phosphatase, bilirubin) 5, 6
Imaging findings:
- Biliary dilatation
- Evidence of obstruction etiology (stricture, stone, obstructing mass) 5
Severity Stratification
Cholangitis severity guides treatment urgency:
- Grade III (Severe): Presence of organ dysfunction - requires urgent decompression
- Grade II (Moderate): Risk of increased severity without early drainage - requires early decompression
- Grade I (Mild): Can be initially observed on medical treatment 1, 2
Microbiology
The most common pathogens are:
- Escherichia coli and Klebsiella species (Gram-negative enteric bacteria)
- Enterococci 7
Blood cultures are positive in 21-71% of cases, while bile cultures are positive in 59-93% of cases. 4
Key Management Principles
The two essential components of therapy are:
- Antimicrobial treatment to manage septic complications
- Biliary decompression to restore biliary drainage 1
Timing is critical: For patients with septic shock, antibiotics should be administered within 1 hour; for less severe cases, within 6 hours of diagnosis. 2
Prognosis
Despite improved management, mortality remains approximately 5% overall. 7 However, in severe cholangitis with delayed intervention, mortality can be significantly higher. Early diagnosis and prompt treatment with both antibiotics and biliary drainage are crucial to prevent adverse outcomes. 1, 8