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Impact of diversity of antibiotic use on the development of antimicrobial resistance

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Issue date
2006
Author
Sandiumenge, Alberto
Diaz, Emili
Rodriguez, Alejandro
Vidaur, Loreto
Canadell, Laura
Olona, Montserrat
Rué i Monné, Montserrat
Rello, Jordi
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Sandiumenge, Alberto; Diaz, Emili; Rodriguez, Alejandro; Vidaur, Loreto; Canadell, Laura; Olona, Montserrat; ... Rello, Jordi. (2006) . Impact of diversity of antibiotic use on the development of antimicrobial resistance. Journal of Antimicrobial Chemotherapy, 2006, vol. 57, núm. 6, p. 1197-1204. https://doi.org/10.1093/jac/dkl097.
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Abstract
Objectives: To evaluate the impact of different antibiotic strategies on acquisition of resistant microorganisms. Methods: A prospective study was conducted over a 44 month period in a single ICU. Four empirical antibiotic strategies for ventilator-associated pneumonia (VAP) were sequentially implemented. Over the initial 10 months, patient-specific antibiotic therapy was prescribed; then, 4 month periods of prioritization or restriction rotation cycles of various antimicrobial agents were implemented for a total of 24 months; and, finally, during the last 10 months (mixing period) the first-line antibiotic for VAP was changed following a pre-established schedule to ensure maximum heterogeneity. Antibiotic consumption was closely monitored every month, and antimicrobial resistance patterns were regularly assessed. Antimicrobial heterogeneity was estimated using a modified Peterson index (AHI) measuring the ratios for the five most used antibiotics. Colonization by targeted microorganisms and susceptibility patterns were compared with the patient-specific period. Results: Higher diversity of antibiotic prescription was obtained during patient-specific therapy (AHI = 0.93) or mixing periods (AHI = 0.95) than during prioritization (AHI = 0.70) or restriction periods (AHI = 0.68). High homogeneity was associated with increases in carbapenem-resistant Acinetobacter baumannii (CR-Ab) [relative risk (RR) 15.5; 95%CI 5.5–42.8], extended-spectrum b-lactamase (ESBL)-producing Enterobacteriaceae (RR 4.2; 95%CI 1.9–9.3) and Enterococcus faecalis (RR 1.7; 95%CI 1.1–2.9). During the restriction period, incidence of ESBL-producing Enterobacteriaceae and E. faecalis returned to patient-specific rates but CR-Ab remained higher. Conclusions: Antibiotic prescription patterns balancing the use of different antimicrobials should be promoted to reduce the selection pressure that aids the development of resistance.
URI
http://hdl.handle.net/10459.1/57103
DOI
https://doi.org/10.1093/jac/dkl097
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Journal of Antimicrobial Chemotherapy, 2006, vol. 57, núm. 6, p. 1197-1204
European research projects
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