Cholangitis

Cholangitis
Recurrent pyogenic cholangitis. (Image courtesy of RadsWiki)
ICD-10	K83.0
ICD-9	576.1
DiseasesDB	2514
eMedicine	med/2665  emerg/96
MeSH	D002761

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Overview

Cholangitis is a clinically defined syndrome of fever, right upper quadrant pain and jaundice caused by infection of bile and inflammation of the biliary tree, usually due to obstruction and stasis. Cholangitis was first described as a life-threatening disorder in 1877 by Charcot. In 1955, Reynolds and Dargan recognized that septic shock and mental status changes portended a poor outcome. (Reynolds’s Pentad).

Epidemiology and Demographics

Parasites are commonly associated with cholangitis outside of the United States. Parasites associated with cholangitis include the Ascaris, Opisthorchis, Clonorchis, Fasciola and Echinococcus. Ascaris is thought to be the etiologic agent of recurrent pyogenic cholangitis (Oriental cholangiohepatitis) found in Hong Kong, Southeast Asia, Columbia, Italy and South Africa. As they migrate to the biliary tree, they bring gut flora with them predisposing to bacterial infection. Dying worms lead to inflammation, granulomatous scarring and fibrosis which may lead to biliary cirrhosis. Opisthorchis and Clonorchis are transmitted by raw fish in Asia, Europe and Siberia and “frequently” lead to the development of cholangiocarcinoma. Fascioloa is transmitted by colonized watercress and does not predispose to cholangiocarcinoma.

Pathophysiology

The presence of gallstones alone predisposes to bacterial colonization. 70% of patients with gallstones will have bacteria in the bile while normal bile is usually sterile. CBD have a higher probability of infection. 80% of stones can be culture positive.

The source of biliary infection is usually ascending from the duodenum or jejunum and less commonly direct hematogenous seeding of the portal system. In the presence of obstruction, the small bowel becomes colonized with colonic flora. The common organisms are E.coli, Klebsiella, Enterococcus, Enterobacter, Proteus. Anaerobes (Strep, Bacteroides, Clostridia) can be found particularly in the elderly. Higher incidence of Pseudomonas in those who have been instrumented. Broad spectrum antibiotics to cover Gram negatives including Pseudomonas, Enterococcus and anaerobes are needed up front. Cephalosporins should not be used as monotherapy. Cipro has been shown in one study to be as effective as monotherapy despite poor coverage for anaerobes and EC.

The most common causes of biliary obstruction are biliary calculi, benign stricture or malignant neoplasms. Benign strictures are caused by primary sclerosing cholangitis, ischemic cholangitis, iatrogenic biliary tract injury, congenital disease and infection. Chronic inflammation predisposed to the development of cholangiocarcinoma. Extraluminal obstruction can occur from pancreatic cancer or pseudocyst, lymphoma, hepatoma, metastatic disease or ampullary cancer.

Biliary obstruction leads to elevated biliary pressures, favoring migration of bacteria into the portal circulation and bile. As pressures increase hepatocyte secretion is impaired and bacteria move into the lymphatics and systemic circulation.

Diagnosis

50-60% of patients will have all three of Charcot’s triad. 95% will have fever, 66% abdominal pain, jaundice is noted in 80% (When bilirubin >2.5). Nonobstructive stones are more likely to present without pain or fever. Elderly patients may present only with hypotension. Dark urine is noted and acholia can be seen.

The combination of hyperbilirubinemia, elevated white blood cell (WBC) count with bandemia, aspartate aminotransferase (AST), alanine aminotransferase (ALT) and alkaline phosphatase elevations all suggest the diagnosis. Alkaline phosphatase and bilirubin are significantly higher inpatients with malignant rather than benign obstruction. In benign obstruction, the bilirubin rarely exceeds 12. Gamma-glutamyltransferase (GGT) and 5’-nucleotidase confirm a biliary origin of the alkaline phosphatase. The prothrombin time is often elevated. AST and ALT may be as high as 1000, especially if microabcesses form.

MRI and CT

CT has a higher sensitivity (63%) and is better to localize the site of obstruction.

MRI

(Images courtesy of RadsWiki)

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  Recurrent pyogenic cholangitis

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  Recurrent pyogenic cholangitis

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  Recurrent pyogenic cholangitis

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  Recurrent pyogenic cholangitis

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  Recurrent pyogenic cholangitis

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  Recurrent pyogenic cholangitis

Other Imaging Findings

• Ultrasound: Diagnostic evaluation should proceed first with ultrasound which has an 55-85% sensitivity. Small stones in the common bile duct may be missed. The CBD may not be enlarged early or if the stones has passed. The ducts may be totally normal in PSC.

Treatment

80% of patients with acute cholangitis will respond to conservative therapy and elective drainage. In 15-20%, the cholangitis will progress requiring emergent drainage. Markers for these people are persistent abdominal pain, hypotensive, fever >102, and confusion.

Patients should be kept NPO, given IVF, broad spectrum ABX, Vitamin K and be drained. Choices for drainage are ERCP with stone removal and sphincterotomy/stent placement, surgically drainage or percutaneous drainage. Intrahepatic stones cannot be removed via ERCP and should be drained percutaneously. Randomized trials comparing ERCP and surgery showed morbidity and mortality benefit for ERCP (4.7-10% versus 10-50%). A nasobiliary catheter can be placed if ERCP is impossible (<5%) either because of coagulopathy precluding sphincterotomy, too large a stone (>2cm) etc. Next step should be percutaneous drainage as a bridge to elective surgery since emergent surgery has an up to 40% mortality.

References

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