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Gentamicin, an aminoglycoside antibiotic, is commonly administered via intermittent intravenous infusion to treat severe infections. An intermittent one-hour infusion of gentamicin, administered at eight-hour intervals, allows for precise control of plasma drug concentrations, minimizing toxicity while ensuring therapeutic efficacy. Pharmacokinetic principles govern the dynamics of plasma concentrations and can be mathematically described using specific equations.The plasma drug concentration...
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Breakpoint determination when multiple organisms are tested for effect targets.

G L Drusano1, Arnold Louie1

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|February 4, 2019
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Summary

This study introduces a new method for determining antibiotic susceptibility breakpoints, especially when pathogen isolates show varied drug exposure needs. A weighted breakpoint of 4 mg/L was identified, offering a rational approach for clinical guidance.

Keywords:
BreakpointsMonte Carlo simulationTarget attainment

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Area of Science:

  • Pharmacology
  • Infectious Diseases
  • Microbiology

Background:

  • Antibiotic susceptibility breakpoints guide clinical antimicrobial use.
  • Current methods, like Probability of Target Attainment (PTA), face challenges with pathogen isolate variability.
  • Regulatory concerns exist regarding breakpoint setting with diverse drug exposure requirements.

Purpose of the Study:

  • To propose and validate a novel method for determining antibiotic susceptibility breakpoints.
  • To address challenges in breakpoint determination when significant between-isolate variability in drug exposure targets is present.
  • To support regulatory authorities in setting reliable breakpoints for antibiotics.

Main Methods:

  • Utilized a neutropenic murine thigh infection model with 8 resistant Enterobacteriaceae isolates.
  • Determined stasis exposure targets, with a mean ± standard deviation of 20.05 ± 13.05 AUC/MIC Ratio.
  • Employed a 5000-iterate Monte Carlo simulation to calculate PTA across various percentiles.

Main Results:

  • Stasis exposure targets ranged from 5.70 to 43.5 AUC/MIC Ratio.
  • Calculated breakpoints varied from 2 mg/L to 32 mg/L across different percentiles.
  • A weighted breakpoint of 4 mg/L was determined, accounting for the distribution of exposure targets.

Conclusions:

  • The proposed method provides a rational approach for breakpoint determination in the presence of substantial between-isolate variability.
  • This method enhances the reliability of antibiotic susceptibility breakpoints for clinical application.
  • The findings support evidence-based antimicrobial stewardship and treatment guidelines.