We aimed to evaluate the predictive performance of previously constructed free (Cfree) and total (Ctotal) cefoxitin pharmacokinetic models and the possibility of administering cefoxitin via the target-controlled infusion (TCI) method in clinical practice. Two external validation studies (N = 31 for Cfree model, N = 30 for Ctotal model) were conducted sequentially. Cefoxitin (2 g) was dissolved in 50 mL of normal saline to give a concentration of 40 mg mL−1. Before skin incision, cefoxitin was infused with a TCI syringe pump. Target concentrations of free concentration and total concentration were set to 25 and 80 μg mL−1, respectively, which were administered throughout the surgery. Three arterial blood samples were collected to measure the total and free plasma concentrations of cefoxitin at 30, 60 and 120 min, after the start of cefoxitin administration. The predictive performance was evaluated using four parameters: inaccuracy, divergence, bias and wobble. The pooled median (95% confidence interval) biases and inaccuracies were − 45.9 (−47.3 to −44.5) and 45.9 (44.5 to 47.3) for Cfree model (Choi_F model), and − 16.6 (−18.4 to −14.8) and 18.5 (16.7 to 20.2) for Ctotal model (Choi_Told model), respectively. The predictive performance of the newly constructed model (Choi_Tnew model), developed by adding the total concentration data measured in the external validation, was better than that of the Choi_Told model. Models constructed with total concentration data were suitable for clinical use. Administering cefoxitin using the TCI method in patients maintained the free concentration above the minimal inhibitory concentration (MIC) breakpoints of the major pathogens causing surgical site infection throughout the operation period.
|Number of pages||10|
|Journal||Clinical and Experimental Pharmacology and Physiology|
|State||Published - Oct 2022|
Bibliographical noteFunding Information:
This work performed under MeDDII project has received funding from the EMPIR programme co‐financed by the Participating States and from the European Union's Horizon 2020 research and innovation programme. This research was also supported by the National Research Foundation of Korea (NRF) (Grant 2019K1A3A1A78077783 and 2020R1C1C1009976).
National Research Foundation of Korea, Grant/Award Numbers: 2019K1A3A1A78077783, 2020R1C1C1009976 Funding information
We are grateful to U Min Seo and Yeri Park, PhD from the International Scientific Standards, Inc. (Chuncheon-si, Gangwon-do, South Korea) for measuring the plasma concentrations of cefoxitin. We are also grateful to Jeong-Sim Yang, AS (Asan Medical Center, Seoul, South Korea) and Do-Yang Park, AS (Asan Medical Center, Seoul, South Korea) for their efforts as clinical research coordinators.
© 2022 The Authors. Clinical and Experimental Pharmacology and Physiology published by John Wiley & Sons Australia, Ltd.