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Scharf, Christina; Weinelt, Ferdinand; Schroeder, Ines; Paal, Michael; Weigand, Michael; Zoller, Michael; Irlbeck, Michael; Kloft, Charlotte; Briegel, Josef and Liebchen, Uwe (23. May 2022): Does the cytokine adsorber CytoSorb® reduce vancomycin exposure in critically ill patients with sepsis or septic shock? a prospective observational study. In: Annals of Intensive Care, Vol. 12 [PDF, 1MB]

Abstract

Background Hemadsorption of cytokines is used in critically ill patients with sepsis or septic shock. Concerns have been raised that the cytokine adsorber CytoSorb ® unintentionally adsorbs vancomycin. This study aimed to quantify vancomycin elimination by CytoSorb ® .

Methods Critically ill patients with sepsis or septic shock receiving continuous renal replacement therapy and CytoSorb ® treatment during a prospective observational study were included in the analysis. Vancomycin pharmacokinetics was characterized using population pharmacokinetic modeling. Adsorption of vancomycin by the CytoSorb ® was investigated as linear or saturable process. The final model was used to derive dosing recommendations based on stochastic simulations.

Results 20 CytoSorb ® treatments in 7 patients (160 serum samples/24 during CytoSorb ® -treatment, all continuous infusion) were included in the study. A classical one-compartment model, including effluent flow rate of the continuous hemodialysis as linear covariate on clearance, best described the measured concentrations (without CytoSorb ® ). Significant adsorption with a linear decrease during CytoSorb ® treatment was identified (p < 0.0001) and revealed a maximum increase in vancomycin clearance of 291% (initially after CytoSorb ® installation) and a maximum adsorption capacity of 572 mg. For a representative patient of our cohort a reduction of the area under the curve (AUC) by 93 mg/L*24 h during CytoSorb ® treatment was observed. The additional administration of 500 mg vancomycin over 2 h during CytoSorb ® attenuated the effect and revealed a negligible reduction of the AUC by 4 mg/L*24 h.

Conclusion We recommend the infusion of 500 mg vancomycin over 2 h during CytoSorb ® treatment to avoid subtherapeutic concentrations.

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