[논문]Pharmacokinetics and Pharmacodynamics of Fluconazole for Cryptococcal Meningoencephalitis: Implications for Antifungal Therapy and In Vitro Susceptibility Breakpoints

Sudan, Ajay; Livermore, Joanne; Howard, Susan J.; Al-Nakeeb, Zaid; Sharp, Andrew; Goodwin, Joanne; Gregson, Lea; Warn, Peter A.; Felton, Tim W.; Perfect, John R.; Harrison, Thomas S.; Hope, William W.

doi:10.1128/AAC.00216-13

Pharmacokinetics and Pharmacodynamics of Fluconazole for Cryptococcal Meningoencephalitis: Implications for Antifungal Therapy and In Vitro Susceptibility Breakpoints 원문보기

Antimicrobial agents and chemotherapy, v.57 no.6, 2013년, pp.2793 - 2800

Sudan, Ajay (School of Translational Medicine, University of Manchester, Manchester Academic Health Science Centre, National Institute for Health Research Translational Research Facility in Respiratory Medicine, University Hospital of South Manchester, National Health Service, Foundation Trust, Manchester, United Kingdom) , Livermore, Joanne (School of Translational Medicine, University of Manchester, Manchester Academic Health Science Centre, National Institute for Health Research Translational Research Facility in Respiratory Medicine, University Hospital of South Manchester, National Health Service, Foundation Trust, Manchester, United Kingdom) , Howard, Susan J. (School of Translational Medicine, University of Manchester, Manchester Academic Health Science Centre, National Institute for Health Research Translational Research Facility in Respiratory Medicine, University Hospital of South Manchester, National Health Service, Foundation Trust, Manchester, United Kingdom) , Al-Nakeeb, Zaid (School of Translational Medicine, University of Manchester, Manc) , Sharp, Andrew , Goodwin, Joanne , Gregson, Lea , Warn, Peter A. , Felton, Tim W. , Perfect, John R. , Harrison, Thomas S. , Hope, William W.

Abstract ▼ AI-Helper

Fluconazole is frequently the only antifungal agent that is available for induction therapy for cryptococcal meningitis. There is relatively little understanding of the pharmacokinetics and pharmacodynamics (PK-PD) of fluconazole in this setting. PK-PD relationships were estimated with 4 clinical isolates of Cryptococcus neoformans. MICs were determined using Clinical and Laboratory Standards Institute (CLSI) methodology. A nonimmunosuppressed murine model of cryptococcal meningitis was used. Mice received two different doses of fluconazole (125 mg/kg of body weight/day and 250 mg/kg of body weight/day) orally for 9 days; a control group of mice was not given fluconazole. Fluconazole concentrations in plasma and in the cerebrum were determined using high-performance liquid chromatography (HPLC). The cryptococcal density in the brain was estimated using quantitative cultures. A mathematical model was fitted to the PK-PD data. The experimental results were extrapolated to humans (bridging study). The PK were linear. A dose-dependent decline in fungal burden was observed, with near-maximal activity evident with dosages of 250 mg/kg/day. The MIC was important for understanding the exposure-response relationships. The mean AUC/MIC ratio associated with stasis was 389. The results of the bridging study suggested that only 66.7% of patients receiving 1,200 mg/kg would achieve or exceed an AUC/MIC ratio of 389. The potential breakpoints for fluconazole against Cryptococcus neoformans follow: susceptible, ≤2 mg/liter; resistant, >2 mg/liter. Fluconazole may be an inferior agent for induction therapy because many patients cannot achieve the pharmacodynamic target. Clinical breakpoints are likely to be significantly lower than epidemiological cutoff values. The MIC may guide the appropriate use of fluconazole. If fluconazole is the only option for induction therapy, then the highest possible dose should be used.

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Pharmacokinetics and Pharmacodynamics of Fluconazole for Cryptococcal Meningoencephalitis: Implications for Antifungal Therapy and In Vitro Susceptibility Breakpoints 원문보기

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