Utilizing Monte Carlo simulations to optimize institutional empiric antipseudomonal therapy

Sarah J. Tennant, Donna R. Burgess, Jeffrey M. Rybak, Craig A. Martin, David S. Burgess

    Research output: Contribution to journalArticlepeer-review

    8 Scopus citations

    Abstract

    Pseudomonas aeruginosa is a common pathogen implicated in nosocomial infections with increasing resistance to a limited arsenal of antibiotics. Monte Carlo simulation provides antimicrobial stewardship teams with an additional tool to guide empiric therapy. We modeled empiric therapies with antipseudomonal β-lactam antibiotic regimens to determine which were most likely to achieve probability of target attainment (PTA) of ≥ 90% Microbiological data for P. aeruginosa was reviewed for 2012. Antibiotics modeled for intermittent and prolonged infusion were aztreonam, cefepime, meropenem, and piperacillin/tazobactam. Using minimum inhibitory concentrations (MICs) from institution-specific isolates, and pharmacokinetic and pharmacodynamic parameters from previously published studies, a 10,000-subject Monte Carlo simulation was performed for each regimen to determine PTA. MICs from 272 isolates were included in this analysis. No intermittent infusion regimens achieved PTA ≥ 90%. Prolonged infusions of cefepime 2000 mg Q8 h, meropenem 1000 mg Q8 h, and meropenem 2000 mg Q8 h demonstrated PTA of 93%, 92%, and 100%, respectively. Prolonged infusions of piperacillin/tazobactam 4.5 g Q6 h and aztreonam 2 g Q8 h failed to achieved PTA ≥ 90% but demonstrated PTA of 81% and 73%, respectively. Standard doses of β-lactam antibiotics as intermittent infusion did not achieve 90% PTA against P. aeruginosa isolated at our institution; however, some prolonged infusions were able to achieve these targets.

    Original languageEnglish (US)
    Pages (from-to)643-652
    Number of pages10
    JournalAntibiotics
    Volume4
    Issue number4
    DOIs
    StatePublished - Dec 11 2015

    Keywords

    • Antimicrobial stewardship
    • Modeling
    • Pharmacodynamics
    • Pharmacokinetics
    • Pseudomonas aeruginosa

    ASJC Scopus subject areas

    • Microbiology
    • Biochemistry
    • Pharmacology, Toxicology and Pharmaceutics(all)
    • Microbiology (medical)
    • Infectious Diseases
    • Pharmacology (medical)

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