Acute Cholangitis

  1. Overview
  2. Pathophysiology
  3. Causes and Risk Factors
  4. Charcot's Triad and Reynolds' Pentad
  5. Tokyo Guidelines Severity Grading (TG18)
  6. Diagnosis
  7. Antibiotic Therapy
  8. Biliary Drainage — ERCP and Alternatives
  9. Prognosis and Complications
  10. Research Papers
  11. Connections
  12. Featured Videos

Overview

Acute cholangitis — also called ascending cholangitis — is a bacterial infection of the biliary tract that arises almost always from biliary obstruction. When bile cannot drain normally, stasis creates the perfect environment for bacterial overgrowth; bacteria ascend from the duodenum through the sphincter of Oddi, infect the stagnant bile, and can rapidly spread into the bloodstream.

Historically this was a death sentence. Jean-Martin Charcot described the classic clinical triad in 1877, yet even after recognition the condition carried close to 100% mortality until the development of endoscopic biliary drainage in the 1970s–1980s transformed it from a surgical catastrophe into a manageable emergency. Today, with prompt antibiotics and biliary decompression, overall mortality ranges from 2–10%. Patients who develop the full Reynolds' Pentad — septic shock plus altered mental status on top of Charcot's Triad — still carry mortality exceeding 50% without urgent drainage.

The Tokyo Guidelines, most recently updated in 2018 (TG18), provide internationally adopted diagnostic criteria and a three-tier severity grading system that drives treatment decisions worldwide.

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Pathophysiology

Under normal conditions the biliary tree is sterile. Bile flow itself provides mechanical clearance, and bile salts have mild antibacterial properties. Obstruction disrupts both mechanisms simultaneously: bile stasis allows bacteria to colonize and multiply unchecked while rising intraductal pressure — above approximately 25 cmH2O — drives bacteria and their endotoxins across the biliary epithelium directly into the hepatic sinusoids and then the systemic circulation.

Two routes of bacterial entry are recognized:

  1. Ascending from the duodenum: the most common path — enteric bacteria migrate retrograde through the sphincter of Oddi, particularly when sphincter competence is impaired by stones, stents, or prior sphincterotomy.
  2. Hematogenous seeding via the portal circulation: less common but clinically important in patients with portal hypertension or bowel ischemia.

The microbiological profile reflects the gut flora. Escherichia coli accounts for 25–50% of isolates, Klebsiella species for 15–20%, and Enterobacter for 5–10%. Gram-positive Enterococcus contributes 10–15%. Anaerobes — Bacteroides, Clostridium — appear in 10–15% of cultures, most often in patients who have undergone prior biliary surgery or endoscopic sphincterotomy. Infections are polymicrobial in 30–40% of cases. Bacteremia is detected in blood cultures in 50–70% of patients when drawn before antibiotics.

The systemic inflammatory response triggered by biliary bacteremia and endotoxemia can escalate rapidly to septic shock and multi-organ failure, which is why biliary decompression — not antibiotics alone — is the cornerstone of treatment in moderate and severe disease.

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Causes and Risk Factors

Any condition that obstructs bile flow can precipitate acute cholangitis. The most important causes are:

Key risk factors include advanced age, diabetes, immunosuppression (organ transplant, HIV, chemotherapy), prior biliary instrumentation, and the presence of gallstones.

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Charcot's Triad and Reynolds' Pentad

Two classic clinical syndromes define the spectrum of acute cholangitis, and both carry the names of the physicians who first described them.

Charcot's Triad (1877)

Jean-Martin Charcot described the combination of:

  1. Fever with rigors — temperature typically exceeding 38.5°C, often with dramatic chills
  2. Right upper quadrant (RUQ) pain — colicky or constant, sometimes radiating to the right shoulder
  3. Jaundice — scleral icterus and yellowing of skin from conjugated hyperbilirubinemia

The triad is highly specific for cholangitis when all three elements are present, but it is seen in only 50–70% of patients. Many — especially the elderly or immunosuppressed — present with an incomplete picture: fever without pain, or jaundice without fever. Relying on the full triad to diagnose cholangitis will miss a significant proportion of cases.

Reynolds' Pentad (1959)

B.M. Reynolds and E.L. Dargan added two more features to Charcot's Triad to define suppurative cholangitis — the condition in which pus is present under pressure within the common bile duct:

  1. All three elements of Charcot's Triad, plus:
  2. Altered mental status — confusion, lethargy, or obtundation from septic encephalopathy
  3. Septic shock — hypotension with evidence of poor tissue perfusion

Reynolds' Pentad signals a biliary emergency. The common bile duct is essentially a pressurized sewer; bacteria and endotoxins pour into the systemic circulation faster than the body can contain the response. Without immediate biliary decompression, mortality exceeds 50%. Every minute spent on optimization without draining the duct is a minute spent allowing the sepsis cascade to deepen.

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Tokyo Guidelines Severity Grading (TG18)

The Tokyo Guidelines were first published in 2007 (TG07), revised in 2013 (TG13), and most recently updated in 2018 (TG18). They provide a three-tier severity system that directly determines the urgency of biliary drainage.

Grade I — Mild

The patient meets criteria for acute cholangitis but has no evidence of organ dysfunction and responds to initial antibiotic therapy within 24 hours. Grade I cholangitis can often be managed medically with elective biliary drainage planned within 24–72 hours.

Grade II — Moderate

The patient does not respond to initial antibiotic treatment within 24 hours, OR has two or more of the following findings at presentation:

Grade II patients require early biliary drainage — within 24–48 hours — not deferred drainage. Antibiotics without drainage will not control the source in these patients.

Grade III — Severe

The patient has dysfunction in at least one organ system:

Grade III requires urgent biliary drainage — within 12–24 hours of initial resuscitation — plus ICU admission. Mortality without drainage in Grade III exceeds 50%. The goal is to achieve hemodynamic stability sufficient to safely perform ERCP, then decompress the duct as rapidly as possible.

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Diagnosis

The TG18 diagnostic criteria provide a structured framework that avoids over-reliance on the classic triad. Diagnosis proceeds through three criteria categories:

Suspected cholangitis: A + B, or A + C. Definite cholangitis: A + B + C. Other causes of infection should be excluded (pneumonia, urinary tract infection, appendicitis).

Laboratory Findings

Imaging

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Antibiotic Therapy

Start antibiotics immediately after obtaining two sets of blood cultures. In acute cholangitis, every hour of delay before antibiotics worsens outcome. The choice of regimen is driven by disease severity, whether the infection is community-acquired or healthcare-associated, and local resistance patterns.

Mild to Moderate — Community-Acquired

Moderate to Severe and Healthcare-Associated

Duration and De-escalation

After successful biliary drainage — defined as resolution of fever and normalization of inflammatory markers — antibiotic duration is typically 4–7 days. Prolonged courses are not necessary and contribute to resistance. Blood culture sensitivities should guide de-escalation to the narrowest effective agent within 48–72 hours.

A critical principle: antibiotics alone are not sufficient for Grade II or Grade III cholangitis. They suppress bacteremia and reduce systemic inflammation, but the infected, obstructed bile duct remains a continuous source unless mechanically drained. Mortality does not fall to acceptable levels with antibiotics alone in moderate or severe disease.

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Biliary Drainage — ERCP and Alternatives

Biliary decompression is the definitive treatment for acute cholangitis. The goal is to lower intraductal pressure, drain infected bile, and remove or bypass the obstruction.

ERCP — The Gold Standard

Endoscopic retrograde cholangiopancreatography is the first-line procedure for biliary drainage in acute cholangitis. A side-viewing duodenoscope is advanced to the ampulla of Vater; the biliary orifice is cannulated, and contrast is injected under fluoroscopy. The endoscopist can then:

Timing of ERCP follows TG18 severity:

After successful stone extraction, elective laparoscopic cholecystectomy is recommended for patients whose stones originated from the gallbladder, to prevent recurrent choledocholithiasis.

PTC — Percutaneous Transhepatic Cholangiography

When ERCP is inaccessible — surgically altered anatomy (Roux-en-Y gastric bypass, Whipple procedure), complete duodenal obstruction, or failed endoscopic cannulation — interventional radiology performs PTC under ultrasound or fluoroscopic guidance. A needle is advanced through the abdominal wall and liver parenchyma into a dilated peripheral bile duct; a guidewire is advanced and an external drain is placed. A subsequent internal-external drain or permanent metal stent can be placed in a staged fashion once the acute infection is controlled.

EUS-Guided Biliary Drainage (EUS-BD)

An emerging technique that has become a viable alternative when ERCP fails. Under endoscopic ultrasound guidance, the endoscopist can create a controlled fistula between the bile duct and an adjacent gastrointestinal lumen:

EUS-BD offers a single-session approach that avoids the risks of PTC (bleeding, bile leak, drain dislodgment) and is now available at specialized centers worldwide.

Surgical Decompression

Open or laparoscopic surgical drainage is a last resort in acute cholangitis — reserved for cases where endoscopic and percutaneous approaches have failed and the obstruction is amenable to surgical correction. Operative morbidity and mortality are substantially higher in the acute setting than in elective cases. Procedures include T-tube choledochostomy for bile duct decompression and common bile duct exploration for stone removal.

Definitive Treatment of the Underlying Cause

Draining the duct controls the acute episode; it does not treat the underlying cause. After recovery from the acute illness:

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Prognosis and Complications

The prognosis of acute cholangitis has improved dramatically over the past four decades as endoscopic drainage has replaced emergency surgery as the primary treatment modality. Overall in-hospital mortality with modern treatment is 2–10%. However, outcomes vary sharply by severity grade.

Prognostic Factors

Independent predictors of poor outcome include:

Major Complications

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Research Papers

  1. Miura F, et al. Tokyo Guidelines 2018: initial management of acute biliary infection and flowchart for acute cholangitis. J Hepatobiliary Pancreat Sci. 2018;25(1):31–40. PMID: 29019233
  2. Kiriyama S, et al. Tokyo Guidelines 2018: diagnostic criteria and severity grading of acute cholangitis. J Hepatobiliary Pancreat Sci. 2018;25(1):17–30. PMID: 29045076
  3. Mukai S, et al. Indications and techniques of biliary drainage for acute cholangitis in updated Tokyo Guidelines 2018. J Hepatobiliary Pancreat Sci. 2017;24(10):537–549. PMID: 28853219
  4. Wada K, et al. Diagnostic criteria and severity assessment of acute cholangitis: Tokyo Guidelines. J Hepatobiliary Pancreat Surg. 2007;14(1):52–58. PMID: 17252296
  5. Reynolds BM, Dargan EL. Acute obstructive cholangitis; a distinct clinical syndrome. Ann Surg. 1959;150(2):299–303. PMID: 14428835
  6. Lee DW, et al. Multicenter randomized trial of endoscopic papillary large-balloon dilation and endoscopic sphincterotomy for removal of large CBD stones. Gastrointest Endosc. 2012;75(3):504–510. PMID: 22018551
  7. Khashab MA, et al. EUS-guided biliary drainage. Curr Opin Gastroenterol. 2016;32(5):369–375. PMID: 27379826
  8. Aadam AA, et al. Endoscopic biliary stenting: indications, choice of stent, and results. Curr Treat Options Gastroenterol. 2015;13(3):285–296. PMID: 25931384
  9. Gomi H, et al. TG13 antimicrobial therapy for acute cholangitis and cholecystitis. J Hepatobiliary Pancreat Sci. 2013;20(1):60–70. PMID: 23340954
  10. Bonnel DH, et al. Percutaneous treatment of intrahepatic non-stone biliary strictures with metallic stents. J Vasc Interv Radiol. 1997;8(3):437–444. PMID: 9152916
  11. van Lent AU, et al. Goal-oriented treatment of acute cholangitis in an outbreak of a multidrug-resistant organism. J Clin Gastroenterol. 2004;38(3):236–241. PMID: 15087689
  12. PubMed search: acute cholangitis biliary drainage outcomes

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Connections

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