Acute cholangitis

Acute Cholangitis Bacterial infection superimposed on an obstruction of the biliary tree most commonly from a gallstone. May be associated with neoplasm or stricture.

Pathophysiology A scending bacterial infection association with partial or complete obstruction of bile ducts. Hepatic bile is sterile, bile in the bile ducts is kept sterile by continuous bile flow and by the presence of antibacterial substances in bile such as immunoglobulin. Mechanical hindrance to bile flow facilitates bacterial contamination.

Pathophysiology T he combination of both significant bacterial contamination and biliary obstruction is required for its development. Gallstones are the most common cause of obstruction in cholangitis. O ther causes are benign and malignant strictures, parasites, instrumentation of the ducts and indwelling stents, and partially obstructed biliary-enteric anastomosis.

Pathophysiology The most common organisms cultured from bile in patients with cholangitis include Escherichia coli, Klebsiella pneumoniae, Streptococcus faecalis , and Bacteroides fragilis .

Clinical Presentation Cholangitis may present as anything from a mild, intermittent, and self-limited disease to a fulminant, potentially life-threatening septicemia. The patient with gallstone-induced cholangitis is typically older and female.

Clinical Presentation The most common presentation is fever, epigastric or right upper quadrant pain, and jaundice. Charcot's triad are present in about two thirds of patients. P rogress rapidly with septicemia and disorientation, known as Reynolds pentad . Mild hepatomegaly Peritonitis (uncommon )

Clinical Presentation History of the following increases the risk of cholangitis: Gallstones, CBD stones Recent cholecystectomy Endoscopic manipulation or ERCP, cholangiogram History of cholangitis History of HIV or AIDS: AIDS-related cholangitis is characterized by extrahepatic biliary edema, ulceration, and obstruction.

Differential Diagnosis Cholecystitis Diverticular disease Hepatitis Mesenteric ischemia Pancreatitis

Work Up CBC: Leukocytosis liver function test : hyperbilirubinemia, elevation of alkaline phosphatase and transamin itis are common PT PTT : Do not expect to be elevated unless sepsis is associated with disseminated intravascular coagulation or underlying cirrhosis exists. C-reactive protein level and erythrocyte sedimentation rate are typically elevated.

Work Up Imaging studies are important to confirm the presence and cause of biliary obstruction and to rule out other conditions. Transabdominal ultrasonography is the initial imaging study of choice. excellent for gallstones and cholecystitis. It is highly sensitive and specific for examining the gallbladder and assessing bile duct dilatation.

Investigation Advantages to sonography include the ability to be performed rapidly at the bedside by the ED physician, capacity to image other structures (eg, aorta, pancreas, liver), identification of complications (eg, perforation, empyema, abscess), and lack of radiation.

Investigation Disadvantages to sonography include operator and patient dependence, cannot image the cystic duct, and decreased sensitivity for distal CBD stones. A normal sonogram does not rule out acute cholangitis.

Investigation The definitive diagnostic test is ERC. In cases in which ERC is not available, PTC is indicated. Both ERC and PTC will show the level and the reason for the obstruction, allow culture of the bile, possibly allow the removal of stones if present, and drainage of the bile ducts with drainage catheters or stents.

Investigation Endoscopic retrograde cholangiopancreatography (ERCP) is both diagnostic and therapeutic and is considered the criterion standard for imaging the biliary system. ERCP has a high success rate (98%) and is considered safer than surgical and percutaneous intervention. Complications include pancreatitis, bleeding, and perforation.

Investigation CT scanning and MRI will show pancreatic and periampullary masses, if present, in addition to the ductal dilatation . Gallstones are poorly visualized with traditional CT scan.

Investigation Magnetic resonance cholangiopancreatography (MRCP) is a noninvasive imaging modality that is increasingly being used in the diagnosis of biliary stones and other biliary pathology.

Investigation MRCP is accurate for detecting choledocholithiasis, neoplasms, strictures, and dilations within the biliary system. Limitations of MRCP include the inability for invasive diagnostic tests such as bile sampling, cytologic testing, stone removal, or stenting. It has limited sensitivity for small stones (<6 mm in diameter).

Investigation HIDA and DISIDA scans are functional studies of the gallbladder. Advantages include its ability to assess function and positive results may appear before the ducts are enlarged sonographically. One disadvantage is that high bilirubin levels (>4.4) may decrease the sensitivity of the study.

Treatment The initial treatment : intravenous antibiotics and fluid resuscitation. Patients with mild cholangitis, 80-90% respond to medical therapy. Approximately 15% do not respond and subsequently require immediate surgical or endoscopic decompression. In severely ill patients, treatment is immediate biliary decompression.

Treatment The selection of procedure should be based on the level and the nature of the biliary obstruction. Patients with choledocholithiasis or periampullary malignancies are best approached endoscopically, with sphincterotomy and stone removal, or by placement of an endoscopic biliary stent.

Treatment In patients in whom the obstruction is more proximal or perihilar, or stricture in a biliary-enteric anastomosis is the cause or the endoscopic route has failed, percutaneous transhepatic drainage is used.

Treatment Where neither ERC nor PTC is possible, an emergent operation and decompression of the common bile duct with a T tube may be necessary and life-saving. Definitive operative therapy should be deferred until the cholangitis has been treated and the proper diagnosis established.

Acute cholangitis

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