Abstract
Purpose
Ceftriaxone total and unbound pharmacokinetics (PK) can be altered in critically ill patients with septic shock and hypoalbuminemia receiving continuous veno-venous hemodiafiltration (CVVHDF). The objective of this study was to determine the dosing strategy of ceftriaxone that maximizes the probability of maintaining the concentration above the MIC of the susceptible bacteria (≤2 mg/L by the EUCAST) for a 100% of the dosing interval (100% ƒuT>MIC).
Methods
In a prospective PK study in the intensive care units of two tertiary Spanish hospitals, six timed blood samples were collected per patient; for each sample, ceftriaxone total and unbound concentrations were measured using a liquid chromatography coupled to tandem mass spectrometry method. Population PK analysis and Monte-Carlo simulations were performed using NONMEMv.7.3®.
Results
We enrolled 8 critically ill patients that met the inclusion criteria (47 blood samples). Median age (range) was 70 years (47-85), weight 72.5 kg (40-95), albumin concentration 24.2 g/L (22-34), APACHE II score at admission 26 (17-36), and SOFA score on the day of study 12 (9-15). The unbound fraction (ƒu) of ceftriaxone was 44%, and total CL was 1.27 L/h, 25-30% higher than the CL reported in septic critically ill patients not receiving renal replacement therapies, and dependent on albumin concentration and weight. Despite this increment in ƒu and CL, Monte-Carlo simulations showed that a dose of 1 g once-daily ceftriaxone is sufficient to achieve a 100% ƒuT>MIC for MICs ≤2 mg/L for any range of weight and albumin concentration.
Conclusion
Once-daily 1 g ceftriaxone provides optimal exposure in critically ill patients with septic shock and hypoalbuminemia receiving CVVHDF.
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Funding
This work has been supported by a grant from the Spanish Ministry of Health, Social Policies and Equality (Ministerio de Sanidad, Servicios Sociales y Igualdad), Government of Spain, project grant number EC11-159. Marta Ulldemolins has been supported in part by this project grant.
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MU, IML, and DS designed the study and wrote the study protocol. MU, MLS, JRB, and AR performed sample and data collection. MU, CB, CC, and DS developed data analysis. MU, CB, IML, and DS drafted the manuscript. All authors critically reviewed the manuscript, and approved the final version.
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Preliminary results of this research were presented in the “XIII Jornadas en Modelización y Simulación en Biomedicina 2020” (25-26th November 2020) as an oral communication.
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The study was conducted following the Declaration of Helsinki guidelines. Authorization for the study was granted by the Spanish Regulatory Medicines Agency (code IEM-ANT-2012-1) and ethical approval was obtained from the local ethics committees. Written informed consent was obtained from each patient’s legally authorized representative.
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The authors declare no competing interests.
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Ulldemolins, M., Bastida, C., Llauradó-Serra, M. et al. Once-daily 1 g ceftriaxone optimizes exposure in patients with septic shock and hypoalbuminemia receiving continuous veno-venous hemodiafiltration. Eur J Clin Pharmacol 77, 1169–1180 (2021). https://doi.org/10.1007/s00228-021-03100-5
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DOI: https://doi.org/10.1007/s00228-021-03100-5