Abstract
Background and Objective
Sepsis and continuous renal replacement therapy (CRRT) can both significantly affect antifungal pharmacokinetics. This study aimed to describe the pharmacokinetics of caspofungin in critically ill patients during different CRRT modes.
Methods
Patients receiving caspofungin and undergoing continuous veno-venous haemofiltration (CVVH) or haemodiafiltration (CVVHDF) were eligible to take part in the study. Blood samples were collected at seven sampling times during a dosing interval. Demographics and clinical data were recorded. Population pharmacokinetic analysis and Monte-Carlo simulation were undertaken using Pmetrics.
Results
Twelve pharmacokinetic profiles from nine patients were analysed. The caspofungin CRRT clearance (CL) was 0.048 ± 0.12 L/h for CVVH and 0.042 ± 0.042 L/h for CVVHDF. A two-compartment linear model best described the data. Patient weight was the only covariate affecting drug CL and central volume. The mean (standard deviation) parameter estimates were 0.64 ± 0.12 L/h for CL, 9.35 ± 3.56 L for central volume, 0.25 ± 0.19 per h for the rate constant for drug distribution from central to peripheral compartments and 0.19 ± 0.10 per h from peripheral to central compartments. Based on simulation results, a caspofungin 100 mg loading dose followed by a 50 mg maintenance dose for patients with a total body weight of ≤80 kg best achieved the pharmacokinetic/PD targets whilst a 70 mg maintenance dose was required for patients with a weight of >80 kg.
Conclusion
No caspofungin dosing adjustment is necessary for patients undergoing either form of CRRT. However, higher than recommended loading doses of caspofungin are required to achieve pharmacokinetic/pharmacodynamic targets in critically ill patients.
Registration: ClinicalTrials.gov Identifier NCT01403220
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Acknowledgements
The authors thank Loubna Elotmani, Audrey Ayral, Sophie Lloret, Jenny Ordonez and all ICU nurses for their help in sampling, collecting data and assay.
Authors’ contributions
CR made substantial contributions to conception, study design, acquisition and interpretation of data, drafting of the manuscript and approved the final version to be published. SCW made substantial contributions to acquisition, analysis and interpretation of data, revision of the manuscript for important intellectual content and approved the final version to be published. LM made substantial contributions to conception, study design, interpretation of data, drafting of the manuscript and approved the final version to be published. GS made substantial contributions to acquisition, analysis and interpretation of data, revision of the manuscript for important intellectual content and approved the final version to be published. JL made substantial contributions to conception, study design, interpretation of data, revision of the manuscript for important intellectual content and approved the final version to be published. RB made substantial contributions to interpretation of data, drafting of the manuscript and approved the final version to be published. JY made substantial contributions to conception, study design, interpretation of data, drafting of the manuscript and approved the final version to be published. JAR made substantial contributions to conception, study design, analysis and interpretation of data, drafting of the manuscript, revision of the manuscript for important intellectual content and approved the final version to be published.
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Ethics approval was obtained from the local ethics committee in Nîmes, France (Comité de Protection des Personnes Sud Mediterranée III 2012.02.05). Written informed consent was obtained from either the patient or their nominated substitute decision maker.
Conflict of interest
JAR is funded by a Career Development Fellowship from the National Health and Medical Research Council of Australia (APP1048652). The authors would like to acknowledge other funding to the Burns Trauma Critical Care Research Centre from the National Health and Medical Research Council of Australia for a Project Grant (APP1044941) and Centre for Research Excellence (APP1099452). RJB declares that he has served as a consultant to and has received unrestricted and research grants from Astellas Pharma Inc., Gilead Sciences, Merck Sharpe and Dohme Corp., and Pfizer Inc. All payments were invoiced by the Radboud University Medical Center. CR, SW, LM, GS, JYL, JL have no conflict of interest to declare.
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This work was supported by academic Grant from the Nîmes University Hospital.
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Roger, C., Wallis, S.C., Muller, L. et al. Caspofungin Population Pharmacokinetics in Critically Ill Patients Undergoing Continuous Veno-Venous Haemofiltration or Haemodiafiltration. Clin Pharmacokinet 56, 1057–1068 (2017). https://doi.org/10.1007/s40262-016-0495-z
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DOI: https://doi.org/10.1007/s40262-016-0495-z