Dosing Nomograms for Attaining Optimum Concentrations of Meropenem by Continuous Infusion in Critically Ill Patients with Severe Gram-Negative Infections: a Pharmacokinetics/Pharmacodynamics-Based Approach

Abstract

ABSTRACTThe worrisome increase in Gram-negative bacteria with borderline susceptibility to carbapenems and of carbapenemase-producingEnterobacteriaceaehas significantly undermined their efficacy. Continuous infusion may be the best way to maximize the time-dependent activity of meropenem. The aim of this study was to create dosing nomograms in relation to different creatinine clearance (CLCr) estimates for use in daily clinical practice to target the steady-state concentrations (Csss) of meropenem during continuous infusion at 8 to 16 mg/liter (after the administration of an initial loading dose of 1 to 2 g over 30 min). The correlation between meropenem clearance (CLm) and CLCrwas retrospectively assessed in a cohort of critically ill patients (group 1,n= 67) to create a formula for dosage calculation to targetCss. The performance of this formula was validated in a similar cohort (group 2,n= 56) by comparison of the observed and the predictedCsss. A significant relationship between CLmand CLCrwas observed in group 1 (r= 0.72,P< 0.001). The application of the formula to meropenem dosing in group 2, infusion rate (g/24 h) = [0.078 × CLCr(ml/min) + 2.85] × targetCss× (24/1,000), led to a significant correlation between the observed and the predictedCsss (r= 0.92,P< 0.001). Dosing nomograms based on CLCrwere created to target the meropenemCssat 8, 12, and 16 mg/liter in critically ill patients. These nomograms could be helpful in improving the treatment of severe Gram-negative infections with meropenem, especially in the presence of borderline susceptible pathogens or even of carbapenemase producers and/or of pathophysiological conditions which may enhance meropenem clearance.