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Allometric versus consensus guideline dosing in achieving target vancomycin trough concentrations.

Matthew L Brown1, Amber M Hutchison2, Aaron M McAtee3

  • 1Princeton Baptist Medical Center, Birmingham, AL mlb0031@auburn.edu.

American Journal of Health-System Pharmacy : AJHP : Official Journal of the American Society of Health-System Pharmacists
|May 20, 2017
PubMed
Summary

Allometric vancomycin dosing improved initial target concentration attainment compared to guideline dosing. This novel approach showed particular benefit in obese patients, enhancing vancomycin therapy effectiveness.

Keywords:
allometric dosingallometryobesitypharmacokineticstrough concentrationvancomycin

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Area of Science:

  • Pharmacology
  • Clinical Pharmacy
  • Pharmacometrics

Background:

  • Vancomycin is a critical antibiotic for treating serious Gram-positive infections.
  • Achieving therapeutic vancomycin trough concentrations is essential for efficacy and minimizing resistance.
  • Current consensus guidelines recommend vancomycin dosing based on total body weight, but optimal attainment rates remain a challenge.

Purpose of the Study:

  • To compare the performance of allometric dosing versus traditional guideline-recommended dosing for vancomycin.
  • To evaluate the achievement of initial vancomycin trough concentrations within the target range (10-20 mg/L).
  • To assess and compare rates of nephrotoxicity between the two dosing strategies.

Main Methods:

  • A retrospective study design was employed.
  • Two vancomycin dosing methods were compared: guideline-based total body weight dosing and an allometric dosing strategy.
  • Primary outcome was initial vancomycin trough concentration attainment; secondary outcome was nephrotoxicity.

Main Results:

  • Allometric dosing achieved target vancomycin trough concentrations in 77% of patients versus 57% with guideline dosing (p=0.0121).
  • In obese patients, allometric dosing improved target attainment significantly (73% vs 46%, p=0.0327).
  • Nephrotoxicity rates were numerically lower with allometric dosing (1.2% vs 7.4%, p=0.0584), though not statistically significant.

Conclusions:

  • Allometric vancomycin dosing is superior to guideline-based dosing in achieving initial therapeutic trough concentrations in hospitalized adults.
  • The benefits of allometric dosing were most evident in the obese patient population.
  • Allometric dosing represents a promising strategy for optimizing vancomycin therapy and potentially reducing adverse events.