Correlation of Calculated Vancomycin Trough Concentrations and Exposure: A Monte Carlo Simulation

Area of Science:

• Pharmacology
• Clinical Pharmacy
• Pharmacokinetics

Background:

• Current vancomycin dosing targets a 24-hour AUC of 400-600 mg·h/L for optimal efficacy and safety.
• Limited data support AUC monitoring, leading some centers to rely on trough concentrations (10-20 mg/L) to mitigate nephrotoxicity.

Purpose of the Study:

• To correlate vancomycin area under the curve (AUC) exposure to trough concentrations using Monte Carlo simulations.
• To evaluate trough concentrations associated with a target AUC range of 400-600 mg·h/L.

Main Methods:

• Utilized previously published pharmacokinetic data and equations for Monte Carlo simulations.
• Simulated 10,000 maintenance doses of vancomycin (15 mg/kg, rounded) to assess trough concentrations at target AUCs of 400 and 600 mg·h/L.

Main Results:

• Targeting an AUC of 400 mg·h/L resulted in a mean trough concentration of 10.3 ± 0.8 mg/L.
• Targeting an AUC of 600 mg·h/L resulted in a mean trough concentration of 15.4 ± 1.2 mg/L.

Conclusions:

• A vancomycin AUC of 400-600 mg·h/L may be achievable with lower trough concentrations than currently targeted.
• This approach could potentially reduce the risk and incidence of nephrotoxicity without compromising therapeutic efficacy.