Background
Cholangiohepatitis, or recurrent pyogenic cholangitis (RPC), is characterized by a recurrent syndrome of bacterial cholangitis that occurs in association with intrahepatic pigment stones and intrahepatic biliary obstruction.
Pathophysiology
Recurrent episodes of cholangitis develop as a result of pyogenic bile duct infection. Predominantly coliform-type bacteria are seeded to the biliary system, and, as a consequence, a cascade of stone formation and recurrent cholangitis is initiated. The bile ducts of patients with cholangiohepatitis are thought to be increasingly susceptible to bacterial seeding as a result of helminthic infections or as a consequence of malnutrition.
Malnutrition results in a relative deficiency of enzymes, such as beta-glucuronidase inhibitor glucaro-1,4-lactone, that inhibit deconjugation of conjugated bilirubin. The relatively unopposed deconjugation favors breakdown of conjugated bilirubin to its unconjugated form, which then complexes with calcium to form calcium bilirubinate. Calcium bilirubinate acts as the nidus for the formation of pigmented stones. Pigment stone formation then leads to recurrent biliary obstruction with the characteristic consequence of suppurative cholangitis. This theory of nutrition associated deficiency of beta-glucuronide has been called into question as definite differences in enzyme levels between patients with gallstones and control subjects are difficult to demonstrate.
Infection in the biliary system from Ascaris lumbricoides or from trematodes, such as Clonorchis sinensis and Opisthorchis viverrini, often results in significant epithelial damage. Clinical and experimental data suggest that coliforms may then result in portal bacteremia by bacterial translocation as a result of this epithelial damage. Repeated portal bacteremia, in turn, results in the cascade of events characterized by biliary stasis, obstruction, and stone formation, which consequently result as RPC.
However, it is more likely that infection and malnutrition act in concert to give rise to RPC.
Epidemiology
Frequency
United States
The condition is rare. It often is observed in immigrants from Southeast Asia or from other regions of the world where trematode infections are endemic. Patients who have RPC develop it over time; hence, there does not appear to be a risk of developing RPC for visitors to endemic areas.
International
The worldwide prevalence of cholangiohepatitis is unclear largely because of the paucity of disease statistics in many parts of the world where this disease is endemic. RPC is prevalent in Hong Kong and East Asia.
Although the arrival of Asian immigrants in the United Kingdom, Australia, Europe, and the United States has resulted in more cases reported in nonendemic areas, the overall incidence in East Asia has been in decline over the last 20 years. Population surveys confirm this trend. The decline in incidence has been credited to the improved economic situation and living standards with the associated westernization of diet.
Mortality/Morbidity
Morbidity is related to recurrent biliary infection and may manifest as pancreatobiliary abnormalities, such as pancreatitis, biliary fistulae, hepatic abscesses, and suppurative cholangitis. Consequences of systemic infections and remote foci of infections account for distant or nonpancreatobiliary morbidity.
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