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Yonsei medical journal v.51 no.5, 2010년, pp.722 - 727   SCIE
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Once-Daily Gentamicin Administration for Community-Associated Methicillin Resistant Staphylococcus aureus in an in vitro Pharmacodynamic Model: Preliminary Reports for the Advantages for Optimizing Pharmacodynamic Index

Kim, Sun Woo    (Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.   ); Lee, Dong-Gun    (Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.   ); Choi, Su-Mi    (Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.   ); Park, Chulmin    (Catholic Research Institutes of Medical Science, College of Medicine, The Catholic University of Korea, Seoul, Korea.   ); Kwon, Jae-Cheol    (Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.   ); Kim, Si-Hyun    (Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.   ); Park, Sun Hee    (Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.   ); Choi, Jung-Hyun    (Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.   ); Yoo, Jin-Hong    (Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.   ); Shin, Wan-Shik    (Department of Internal Medicine, College of Medi  );
  • 초록

    Purpose Community-associated methicillin resistant Staphylococcus aureus (CA-MRSA) infections are increasing. Although gentamicin (GEN) is usually susceptible against CA-MRSA, GEN is rarely considered for treatment as monotherapy. We employed an in vitro pharmacodynamic model (IVPDM) to compare efficacies of GEN against CA-MRSA with two dosing regimens [thrice-daily (TD), once-daily (OD)]. Materials and Methods Using two strains of CA-MRSA, we adopted IVPDM comprised of two-compartments with a surface-to-volume ratio of 5.34 cm -1 . GEN regimens were simulated with human pharmacokinetic data of TD and OD. Experiments were performed over 48 hours in triplicate for each strain and dosing regimen. Results MICs of GEN for YSSA1 and YSSA15 were 1 and 2 mg/L, respectively. In OD, indices of peak/MIC were > 8.6 at least, in contrast to 10 reduction in CFU/mL was demonstrated prior to 4 hours in TD and OD, and continued until 8 hours for both strains. However, reductions in the colony counts at 24 and 48 hours were significantly larger for OD compared to TD in both strains ( p Conclusion TD and OD showed the same killing slopes until 8 hours. After the 24 hours of experiments, OD of GEN would be advantageous not only in having more reductions in colony counts, but also suppressing the development of resistance or SCVs for 48 hours.


  • 주제어

    Methicillin-Resistant Staphylococcus aureus .   gentamicin .   pharmacodynamics .   once-daily treatment.  

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