The role of surveillance cultures in the prediction of susceptibility patterns of Gram-negative bacilli in the intensive care unit.
Summary of "The role of surveillance cultures in the prediction of susceptibility patterns of Gram-negative bacilli in the intensive care unit."
Surveillance cultures may detect colonisation with drug-resistant Gram-negative bacteria and can be hypothesised to guide appropriate initial antibiotic treatment for intensive care unit (ICU) patients. We investigated the microbiological data of 228 episodes of nosocomial bloodstream infection (BSI) due to Gram-negative bacteria in an ICU in which piperacillin/tazobactam or meropenem was used empirically for serious infections, to evaluate the contribution of surveillance cultures to an appropriate choice of initial antibiotic therapy. Surveillance cultures were taken in advance of BSI in 218 (95.6%) of 228 episodes. Concordant organisms with identical identification and susceptibilities were found in prior surveillance cultures and subsequent blood cultures in 65 (29.8%) of 218 episodes. Surveillance cultures predicted resistance in 52.9% and 51.4% of BSIs caused by resistant pathogens to piperacillin/tazobactam and meropenem, respectively. The negative predictive value of surveillance cultures negative for a resistant organism also exceeded 90% for piperacillin/tazobactam and meropenem. Given that the overall resistant rates of BSI pathogens of our study were 11.3% to piperacillin/tazobactam and 16.4% to meropenem, surveillance cultures in our setting may provide important information on the probability of drug resistance of the causative pathogens and some utility in aiding empiric antibiotic therapy for ICU patients who subsequently develop BSI.
University of Queensland Centre for Clinical Research, Brisbane, Australia, firstname.lastname@example.org.
This article was published in the following journal.
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/21222134
- DOI: http://dx.doi.org/10.1007/s10096-010-1146-1
Medical and Biotech [MESH] Definitions
A genus of gram-negative, facultatively anaerobic, rod-shaped bacteria that utilizes citrate as a sole carbon source. It is pathogenic for humans, causing enteric fevers, gastroenteritis, and bacteremia. Food poisoning is the most common clinical manifestation. Organisms within this genus are separated on the basis of antigenic characteristics, sugar fermentation patterns, and bacteriophage susceptibility.
Gram-negative Aerobic Bacteria
A large group of aerobic bacteria which show up as pink (negative) when treated by the gram-staining method. This is because the cell walls of gram-negative bacteria are low in peptidoglycan and thus have low affinity for violet stain and high affinity for the pink dye safranine.
Product Surveillance, Postmarketing
Surveillance of drugs, devices, appliances, etc., for efficacy or adverse effects, after they have been released for general sale.
Gram-negative Bacterial Infections
Infections caused by bacteria that show up as pink (negative) when treated by the gram-staining method.
Gram-negative Anaerobic Cocci
A group of anaerobic coccoid bacteria that show up as pink (negative) when treated by the gram-staining method.
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