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  • Title: Ex vivo Ceftolozane/Tazobactam Clearance during Continuous Renal Replacement Therapy.
    Author: Chaijamorn W, Shaw AR, Lewis SJ, Mueller BA.
    Journal: Blood Purif; 2017; 44(1):16-23. PubMed ID: 28237981.
    Abstract:
    BACKGROUND/AIMS: To determine ceftolozane/tazobactam transmembrane clearances (CLTM) in continuous hemofiltration (CHF) and continuous hemodialysis (CHD) and to determine optimal ceftolozane/tazobactam dosing regimens for patients receiving continuous renal replacement therapy (CRRT). METHOD: Validated, ex vivo CHF and CHD bovine blood models using polysulfone (HF1400) and AN69 (Multiflow 150-M) hemofilters were used to evaluate adsorption and CLTM at different effluent flow rates. Monte Carlo simulations (MCS) using pharmacokinetic parameters from published studies and CLTM from this study were used to generate ceftolozane/tazobactam dosing for patients receiving CRRT. RESULTS: CHF and CHD CLTM did not differ at equivalent effluent rates. CLTM approximated effluent flow rates. No adsorption of ceftolozane/tazobactam occurred for either hemofilter. Effluent flow was the most important determinant of MCS-derived doses. CONCLUSION: CRRT clearances of ceftolozane/tazobactam depended on effluent flow rates but not hemofilter types. MCS-derived ceftolozane/tazobactam doses of 750 (500/250)-1,500 (1,000/500) mg every 8 h met pharmacodynamic targets for virtual patients receiving CRRT at contemporary effluent rates.
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