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Systematic Review of Antimicrobial Combination Options for Pandrug-Resistant Acinetobacter baumannii

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ANTIBIOTICS-BASEL
卷 10, 期 11, 页码 -

出版社

MDPI
DOI: 10.3390/antibiotics10111344

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Acinetobacter; pandrug-resistant; antimicrobial combinations; synergy

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Combination antimicrobial therapy is currently the only potential treatment option for pandrug-resistant A. baumannii. Some combinations exhibit synergy at clinically relevant concentrations, with triple combinations showing greater activity than double combinations, but no combination consistently demonstrates synergy against all strains tested.
Antimicrobial combinations are at the moment the only potential treatment option for pandrug-resistant A. baumannii. A systematic review was conducted in PubMed and Scopus for studies reporting the activity of antimicrobial combinations against A. baumannii resistant to all components of the combination. The clinical relevance of synergistic combinations was assessed based on concentrations achieving synergy and PK/PD models. Eighty-four studies were retrieved including 818 eligible isolates. A variety of combinations (n = 141 double, n = 9 triple) were tested, with a variety of methods. Polymyxin-based combinations were the most studied, either as double or triple combinations with cell-wall acting agents (including sulbactam, carbapenems, glycopeptides), rifamycins and fosfomycin. Non-polymyxin combinations were predominantly based on rifampicin, fosfomycin, sulbactam and avibactam. Several combinations were synergistic at clinically relevant concentrations, while triple combinations appeared more active than the double ones. However, no combination was consistently synergistic against all strains tested. Notably, several studies reported synergy but at concentrations unlikely to be clinically relevant, or the concentration that synergy was observed was unclear. Selecting the most appropriate combinations is likely strain-specific and should be guided by in vitro synergy evaluation. Furthermore, there is an urgent need for clinical studies on the efficacy and safety of such combinations.

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