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Evaluation of six gentamicin nomograms using a bayesian parameter estimation program.

A H Thomson1, K C Campbell, A W Kelman

  • 1Department of Medicine and Therapeutics, Stobhill General Hospital, Glasgow, Scotland.

Therapeutic Drug Monitoring
|May 1, 1990
PubMed
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New guidelines for gentamicin dosing were developed to achieve target peak and trough concentrations. While effective for some patients, serum monitoring remains crucial for confirming optimal gentamicin dosing requirements.

Area of Science:

  • Pharmacology
  • Clinical Pharmacy
  • Drug Dosing

Background:

  • Gentamicin dosing requires careful consideration of patient-specific factors.
  • Achieving therapeutic gentamicin concentrations is essential for efficacy and minimizing toxicity.

Purpose of the Study:

  • To develop and evaluate new guidelines for gentamicin administration.
  • To determine the most appropriate gentamicin doses for achieving target peak (5-10 mg/L) and trough (<2 mg/L) concentrations.

Main Methods:

  • Developed new gentamicin dosing guidelines based on simulated patient data (weight, creatinine clearance).
  • Assessed guideline performance using Bayesian parameter estimation in 60 patients with gentamicin serum concentrations.
  • Compared new guidelines against five established nomograms (Mawer, Chan, Hull-Sarubbi, Rule of Eight, Dettli).

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Main Results:

  • New guidelines, Dettli, and Hull-Sarubbi achieved 52-57% of patients within target gentamicin ranges.
  • The new method resulted in 28% of patients having predicted peak concentrations below 5 mg/L.
  • Mawer and Rule of Eight methods achieved target ranges in only 38% of patients.

Conclusions:

  • New gentamicin dosing guidelines show comparable performance to some existing methods.
  • A significant percentage of patients may fall outside target ranges regardless of the nomogram used.
  • Continued serum concentration monitoring is recommended for individualized gentamicin dose adjustments.