Evaluation of Blood Stream and Biliary Tract Infections Related to Percutaneous Transhepatic Cholangiography and Prophylaxis Given in Patients with Malignancy

Objective

Percutaneous transhepatic cholangiography (PTC) is an invasive procedure used in patients with obstructive jaundice in the progress of some malignancies, and its most common complication is infection. We aimed to evaluate the patients who underwent PTC regarding their cultures, prophylaxis, and antibiotics used for treatment.

Materials and Methods

In this cross-sectional study, patients who underwent PTC and were followed up in a medical oncology outpatient clinic between 2010-2017 were evaluated retrospectively. Patients' data were obtained from the hospital record system (FONET), epicrisis forms, and patient progress files.

Results

A total of 93 patients were included in the study. Prophylaxis was given in 50% of the cases. Complications developed in 68% of the cases after the intervention, and the infectious disease clinic consulted all. Blood cultures were obtained from 89% of the febrile patients; however, bile cultures were obtained only from 29%. The rate of resistant Gram-negative enteric bacteria in growing microorganisms was 52% (n=13). It was determined that 65% of the initiated empirical treatments were appropriate for the growth of microorganisms.

Conclusion

The growth rate was significantly higher in blood cultures than in bile cultures. The lower growth rate in bile culture was attributed to the low number of bile cultures. There was no significant difference regarding the growth rate and drug resistance of the microorganisms. Therefore, we think giving antibiotics as treatment rather than prophylaxis is more appropriate. Taking cultures will ensure that patients receive appropriate antibiotic therapy for the causative agent.

Human Bile Reduces Antimicrobial Activity of Selected Antibiotics against Enterococcus faecalis and Escherichia coli In Vitro

It has been known from previous studies that body fluids, such as cerebrospinal fluid, lung surfactant, and urine, have a strong impact on the bacterial killing of many anti-infective agents. However, the influence of human bile on the antimicrobial activity of antibiotics is widely unknown. Human bile was obtained and pooled from 11 patients undergoing cholecystectomy. After sterilization of the bile fluid by gamma irradiation, its effect on bacterial killing was investigated for linezolid (LZD) and tigecycline (TGC) against Enterococcus faecalis ATCC 29212. Further, ciprofloxacin (CIP), meropenem (MEM), and TGC were tested against Escherichia coli ATCC 25922. Time-kill curves were performed in pooled human bile and Mueller-Hinton broth (MHB) over 24 h. Bacterial counts (in CFU per milliliter after 24 h) of bile growth controls were approximately equal to MHB growth controls for E. coli and approximately 2-fold greater for E. faecalis, indicating a promotion of bacterial growth by bile for the latter strain. Bile reduced the antimicrobial activity of CIP, MEM, and TGC against E. coli as well as the activity of LZD and TGC against E. faecalis This effect was strongest for TGC against the two strains. Degradation of TGC in bile was identified as the most likely explanation. These findings may have important implications for the treatment of bacterial infections of the gallbladder and biliary tract and should be explored in more detail.