Because of small number of enrolled patients, we terminated this study.

Cholangitis is a complication of biliary statsis. Bile juice is sterile when there is no obstruction, however, it can be infected with bacteria when there is a stasis or obstruction. After infection, cholangitis can be developed because of systematic endotoxemia or bacteremia. Though identification of bacteria is very important for selection of adequate antibiotics, treatment with empirical antibiotics is commonly performed when identification of bacteria is not possible.

Identification of bacteria is usually done with blood or bile culture. In the previous studies, the same results from blood and bile were common in patients with cholangitis. However, the data of these studies were based on the bile juice which was aspirated by surgery. Considering that bile duct obstruction is usually treated with endoscopy or radiological intervention without surgery, it is necessary to collect data with endoscopic or radiologic intervention. In addition, the concordant rate of these two tests has not been reported according to severity of cholangitis. As a result, the necessities of bile and blood culture are not agreed among experts in this fields.

Our hypothesis is that concordant rates of bile and blood culture are same in patients with each moderate or severe cholangitis. However, the concordant rates of bile and blood culture are different between patients with moderate and severe cholangitis. This study will assess the positive rates of blood and bile culture in patients with moderate or severe cholangitis, respectively and compare the results according to the different severity.

Inclusion Criteria:

• Patients with moderate or severe cholangitis which fullfilled the criteria by the Tokyo Guidelines (Tanaka A, Takada T, Kawarada Y, et al. Antimicrobial therapy for acute cholangitis: Tokyo Guidelines. J Hepatobiliary Pancreat Surg 2007;14:59-67.)
• Patients who are successfully treated with endoscopic or radiologic biliary drainage
• Patients who undergo both blood and bile culture tests

Exclusion Criteria:

• Patients with other infections except cholangitis or cholecystitis
• Patients who received surgical biliary drainage treatment
• Patients who are treated with endoscopic or radiologic biliary drainage more than 24 hours after using initial antibiotics
• Patients who does not agree with informed consent or who are vulnerable subjects

The patients who visited to tertiary medical center(Seoul National University Bundang Hospital) because of moderate or severe obstructive cholangitis