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Increasing vancomycin serum trough concentrations and incidence of nephrotoxicity

Lindsey Pritchard1, Catherine Baker, James Leggett

  • 1St. Louis College of Pharmacy, St. Louis, MO 63110-1088, USA. lprichard@stlcop.edu

The American Journal of Medicine
|December 25, 2010
PubMed
Abstract

Insights

Higher vancomycin trough concentrations and longer treatment durations increase the risk of vancomycin-associated nephrotoxicity. Careful patient assessment is crucial when targeting higher drug levels.

Area of Science:

  • Pharmacology
  • Nephrology
  • Infectious Diseases

Background:

  • Conflicting evidence exists on optimal vancomycin concentrations, with recent recommendations for higher trough levels (15-20 mg/L).
  • Limited research has correlated vancomycin serum concentrations with toxicity, specifically nephrotoxicity.
  • This study aimed to evaluate the association between vancomycin serum trough concentrations and nephrotoxicity.

Purpose of the Study:

  • To investigate the relationship between vancomycin serum trough concentrations and the incidence of nephrotoxicity.
  • To identify predictors of vancomycin-induced nephrotoxicity.
  • To analyze trends in vancomycin prescribing and associated toxicity.

Main Methods:

  • A 2-phase retrospective analysis of vancomycin therapy courses.
  • Phase 1: Assessed 2493 courses (2003-2007) for trends and associations between nephrotoxicity, serum creatinine, vancomycin trough concentrations, and therapy duration.
  • Phase 2: Examined patients receiving vancomycin in 2007 to identify specific nephrotoxicity risk factors.

Main Results:

  • Vancomycin trough concentrations ≥ 15 mg/L and ≥ 20 mg/L increased significantly over the study period.
  • Independent predictors of nephrotoxicity included vancomycin trough concentrations ≥ 14 mg/L, therapy duration ≥ 7 days, and baseline serum creatinine ≥ 1.7 mg/dL.
  • Mean vancomycin serum trough concentration was a significant predictor of nephrotoxicity; 81% of cases resolved.

Conclusions:

  • Elevated vancomycin serum trough concentrations and prolonged therapy duration are linked to increased nephrotoxicity risk.
  • Targeting higher vancomycin trough concentrations requires careful consideration of infection severity and potential nephrotoxicity.
  • Clinical decisions on vancomycin dosing should balance efficacy with patient safety and renal function.

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