Document Detail

Antimicrobial susceptibility patterns of multidrug-resistant Pseudomonas aeruginosa and Acinetobacter baumannii against carbapenems, colistin, and tigecycline.
MedLine Citation:
PMID:  22821309     Owner:  NLM     Status:  In-Data-Review    
OBJECTIVE: To examine susceptibility of Pseudomonas aeruginosa (P. aeruginosa) and Acinetobacter baumannii (A. baumannii ) against carbapenems along with colistin and tigecycline as alternative therapeutic options.
METHODS: A total of 117 strains of multidrug-resistant (MDR) non-fermenting Gram negative bacteria isolated from non-duplicate samples were collected consecutively. We included one sample from each patient (84 isolates of A. baumannii and 33 isolates of P. aeruginosa isolated from patients seen at King Khalid University Hospital, Riyadh, Saudi Arabia, from June to December 2010). Isolates were identified by the MicroScan WalkAway 96 Plus system. The minimum inhibitory concentrations (MICs) were determined by E-test following the Clinical and Laboratory Standards Institute breakpoint recommendations.
RESULTS: Most A. baumannii strains were resistant to imipenem (90.5%), meropenem (90.5%), and doripenem (77.4%). Whereas, a higher percentage of P. aeruginosa was resistant to imipenem (90.9%), and meropenem (81.8%), only 39.4% were resistant to doripenem. Colistin had excellent activity against both A. baumannii (100%) and P. aeruginosa (93.9%), while 89.3% of A. baumannii strains were susceptible to tigecycline.
CONCLUSION: Among the carbapenems, doripenem was found to be the most potent antimicrobial agent against P. aeruginosa, whereas colistin proved to be an effective alternative antimicrobial agent for treatment of A. baumannii or P. aeruginosa. Tigecycline remains the best therapeutic option for MDR A. baumannii.
Ali M Somily; Muhammad M Absar; Muhammad Z Arshad; Abdulkarim I Al Aska; Zahid A Shakoor; Amal J Fatani; Yunus M Siddiqui; Thomas S Murray
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Saudi medical journal     Volume:  33     ISSN:  0379-5284     ISO Abbreviation:  Saudi Med J     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-07-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7909441     Medline TA:  Saudi Med J     Country:  Saudi Arabia    
Other Details:
Languages:  eng     Pagination:  750-5     Citation Subset:  IM    
Department of Pathology/Microbiology (32), College of Medicine, King Khalid University Hospital, King Saud University, PO Box 2925, Riyadh 11461, Kingdom of Saudi Arabia. Tel. +966 (1) 4672640/ 4671010. Fax. +966 (1) 4679162. E-mail:
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