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Pharmacodynamics: relation to antimicrobial resistance.
1Anti-Infective Research Laboratory, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, MI 48201, USA. m.rybak@wayne.edu
American Journal of Infection Control
|July 4, 2006
Summary
Antibiotic pharmacodynamics (PD) uses pharmacokinetic (PK)/PD parameters like AUC/MIC to predict drug efficacy and minimize resistance. Understanding these relationships is key for effective antibiotic use and combating antimicrobial resistance.
Area of Science:
- Pharmacology
- Microbiology
- Infectious Diseases
Background:
- Antibiotic pharmacodynamics (PD) links drug properties (pharmacokinetics, PK) with antimicrobial activity against pathogens.
- Patient factors significantly influence drug PK and susceptibility to infections.
- Key PD parameters predicting antibiotic efficacy include Cmax/MIC, AUC/MIC, and T>MIC.
Purpose of the Study:
- To explore the role of PK/PD parameters in predicting antibiotic efficacy.
- To investigate the application of PK/PD parameters in minimizing the development of antimicrobial resistance.
- To examine specific PK/PD targets for different antibiotic classes and pathogens.
Main Methods:
- Review of established PK/PD parameters (Cmax/MIC, AUC/MIC, T>MIC) and their correlation with antibiotic efficacy.
- Analysis of the "mutant selection window" hypothesis for fluoroquinolone resistance.
- Examination of the AUC/MIC ratio's role in predicting resistance emergence for fluoroquinolones and vancomycin in Staphylococcus aureus.
Main Results:
- Cmax/MIC predicts aminoglycoside efficacy; AUC/MIC is optimal for fluoroquinolones, glycopeptides, and ketolides; T>MIC is best for beta-lactams and macrolides.
- The AUC/MIC ratio is implicated in both increased and decreased risks of fluoroquinolone resistance.
- Emergence of vancomycin resistance in Staphylococcus aureus may be linked to specific AUC/MIC exposures.
Conclusions:
- PK/PD parameters are crucial for optimizing antibiotic therapy and mitigating resistance.
- The AUC/MIC ratio shows promise for guiding antibiotic exposure to prevent resistance, particularly with fluoroquinolones and vancomycin.
- Combination therapies utilizing PK/PD principles may help lower resistance emergence rates, warranting further investigation.