Acute cholangitis refers to infection of the biliary tree characteristically resulting in pain, jaundice and fevers.
Acute cholangitis almost always occurs due to bacterial infection secondary to biliary obstruction. The terms acute and ascending cholangitis can be used interchangeably.
Biliary obstruction is often secondary to choledocholithiasis (gallstones in the biliary tree) or biliary strictures (both benign and malignant). Management involves antibiotics and urgent decompression of the obstructed biliary system.
Acute cholangitis is a relatively uncommon condition.
The exact incidence is unknown. The median presenting age is 50-60, affecting men and women equally. There appears to be greater incidence in caucasians, hispanics and Native Americans - following the distribution of gallstones.
It occurs following ERCP in around 0.5 - 3%. Recurrent pyogenic cholangitis is seen in southeast Asian populations.
Choledocholithiasis, stones in the bile duct, is the most common cause of acute cholangitis.
Choledocholithiasis refers to gallstones within the bile ducts. It occurs in around 10-20% of people with cholelithiasis (gallstones). It should be noted that not all patients with choledocholithiasis develop cholangitis, and such stones may be asymptomatic.
Acute cholangitis occurs due to impaired drainage and bacterial overgrowth. It is the most common cause of ascending cholangitis, implicated in around 80% of cases.
Benign strictures, leading to obstruction, may occur in the biliary tree for numerous reasons:
Primary sclerosing cholangitis is a chronic, progressive condition associated with ulcerative colitis. It is characterised by inflammation and stricturing of bile ducts. Although the strictures are typically benign, patients are at increased risk of many cancers including cholangiocarcinoma, gallbladder cancer and hepatocellular carcinoma.
Malignant biliary strictures may lead to acute cholangitis. Malignancies include cholangiocarcinoma, pancreatic cancer and gallbladder cancer.
Ascending cholangitis often presents with upper abdominal pain, jaundice and fevers.
Ascending cholangitis was first described by Charcot as a life-threatening condition. We now know it may present with a wide spectrum of symptoms though fever, jaundice (may be sub-clinical) and pain are common. Two sets of symptoms are often described:
Not all features may be present, Charcot's triad is seen in around 50-70% of cases. Shock and confusion are only seen in the most serious cases with systemic sepsis. Jaundice is often best seen in the sclera, it may be less clinically apparent in those with darker skin tones. If there is any suspicion send for urgent LFTs and make the assessment by reviewing the bilirubin.
Acute cholangitis is most commonly investigated with USS, CT abdomen/pelvis and MRCP.
Patients typically presented with upper abdominal pain, tenderness, jaundice and fever. Blood tests reveal elevated inflammatory markers and an obstructive picture (raised bilirubin and ALP, though transaminases may also be elevated) on liver function tests.
Ultrasound: It allows assessment of the gallbladder for gallstones and assessment of the CBD
Computed tomography: Good visualisation of the biliary tree, including the distal portion, used where USS inconclusive, to evaluate for abnormal lesions/tumours or where other diagnoses are suspected.
MRCP: Magnetic resonance cholangiopancreatography offers excellent visualisation of the biliary tree. Often used where CT/USS are inconclusive.
ERCP: Endoscopic retrograde cholangiopancreatography involves the endoscopic intubation of the ampulla of Vater. It offers excellent views of the biliary tree whilst allowing therapeutic intervention such as drainage. ERCP is now generally a therapeutic rather than diagnostic intervention.
Patients with an infected, obstructed biliary system require urgent drainage.
Initial management should follow an ABC approach in those who are acutely unwell. The sepsis 6 protocol should be implemented when indicated. Key components of management include:
Drainage of the infected biliary system is key to effective management. It is now achieved utilising non-operative techniques (except in very rare cases). There are two main options:
Further management depends on the underlying aetiology. Elective cholecystectomy is indicated in those with gallstones after a period of recovery.
Those with strictures need the cause identified (if not already) and may require further surgery/endoscopic management. Malignancies are managed via appropriate MDTs.
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