| Title |
In vitro activity of colistin mono- and combination therapy against colistin-resistant Acinetobacter baumannii, mechanism of resistance, and clinical outcomes of patients infected with colistin-resistant A. baumannii at a Thai university hospital
|
|---|---|
| Published in |
Infection and Drug Resistance, November 2017
|
| DOI | 10.2147/idr.s148185 |
| Pubmed ID | |
| Authors |
Yongyut Lertsrisatit, Wichai Santimaleeworagun, Sudaluck Thunyaharn, Jantima Traipattanakul |
| Abstract |
Colistin is a drug of last resort for treating multidrug-resistant Acinetobacter baumannii infections. Unfortunately, colistin-resistant A. baumannii (CoR-AB) has been reported. Here, we examined the in vitro effect of mono- and combined antimicrobials against CoR-AB strains and their resistance mechanism, and evaluated the clinical outcomes of CoR-AB-infected patients. Seventeen clinical CoR-AB strains were isolated from patients at Phramongkutklao hospital, 2011-2015. The mono- and synergistic activities of colistin, tigecycline, sulbactam, imipenem, meropenem, amikacin, fosfomycin, and cotrimoxazole were examined by minimum inhibitory concentration (MIC) and fractional inhibitory concentration index. Clonal relationship and resistance genes were determined by repetitive extragenic palindromic polymerase chain reaction with specific primers. The effect of carbonyl cyanide 3-chlorophenylhydrazone combined with colistin was used to test efflux pump involvement. Patient treatment outcomes were also reported. The most prevalent infection in CoR-AB patients was pneumonia (35.3%), and all patients were administered colistin combined with another agent. The 30-day mortality was 70.6%, and the colistin MIC range and MIC50 was 16-512 μg/mL and 64 μg/mL, respectively. All CoR-AB strains were sensitive to tigecycline. Sporadic isolates were susceptible to sulbactam, imipenem, meropenem, and cotrimoxazole. A synergistic or additive effect was observed for colistin plus imipenem or meropenem (16.7%), sulbactam (66.7%), or tigecycline (66.7%). The CoR-AB isolates could be divided into four different clones (A-D) with a high prevalence of group B (47.1%). Eight isolates harbored blaOXA23, blaIMP, blaKPC, and blaNDM, and one contained blaOXA23, blaIMP, and blaKPC, while the eight remaining isolates carried only blaOXA23. The MIC values of all strains were greatly reduced for colistin plus carbonyl cyanide 3-chlorophenylhydrazone. CoR-AB clinical isolates exhibited very high colistin resistance and a high frequency of resistance genes. The mechanism of colistin resistance appears to be mediated via an efflux pump. Thus, certain antimicrobials could be used as salvage therapy for CoR-AB infection. |
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Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Unknown | 1 | 100% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 1 | 100% |
Mendeley readers
The data shown below were compiled from readership statistics for 36 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Unknown | 36 | 100% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Bachelor | 9 | 25% |
| Student > Master | 4 | 11% |
| Researcher | 3 | 8% |
| Student > Ph. D. Student | 2 | 6% |
| Student > Postgraduate | 2 | 6% |
| Other | 1 | 3% |
| Unknown | 15 | 42% |
| Readers by discipline | Count | As % |
|---|---|---|
| Biochemistry, Genetics and Molecular Biology | 7 | 19% |
| Medicine and Dentistry | 4 | 11% |
| Pharmacology, Toxicology and Pharmaceutical Science | 3 | 8% |
| Chemistry | 2 | 6% |
| Computer Science | 1 | 3% |
| Other | 3 | 8% |
| Unknown | 16 | 44% |
Attention Score in Context
This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 30 December 2017.
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#22,764,772
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Outputs from Infection and Drug Resistance
#1,577
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#299,290
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Outputs of similar age from Infection and Drug Resistance
#20
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