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Tsai D, Zam BB, Tongs C, Chiong F, Sajiv C, Pawar B, Ashok A, Cooper BP, Tong SYC, Janson S, Wallis SC, Roberts JA, Parker SL. Validating a novel three-times-weekly post-hemodialysis ceftriaxone regimen in infected Indigenous Australian patients-a population pharmacokinetic study. J Antimicrob Chemother 2023:dkad190. [PMID: 37367723 PMCID: PMC10393936 DOI: 10.1093/jac/dkad190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 06/05/2023] [Indexed: 06/28/2023] Open
Abstract
OBJECTIVES To describe the total and unbound population pharmacokinetics of a 2 g three-times-weekly post-dialysis ceftriaxone regimen in Indigenous Australian patients requiring hemodialysis. METHODS A pharmacokinetic study was carried out in the dialysis unit of a remote Australian hospital. Adult Indigenous patients on intermittent hemodialysis (using a high-flux dialyzer) and treated with a 2 g three-times-weekly ceftriaxone regimen were recruited. Plasma samples were serially collected over two dosing intervals and assayed using validated methodology. Population pharmacokinetic analysis and Monte Carlo simulations were performed using Pmetrics in R. The probability of pharmacokinetic/pharmacodynamic target attainment (unbound trough concentrations ≥1 mg/L) and toxicity [trough concentrations (total) ≥100 mg/L] were simulated for various dosing strategies. RESULTS Total and unbound concentrations were measured in 122 plasma samples collected from 16 patients (13 female) with median age 57 years. A two-compartment model including protein-binding adequately described the data, with serum bilirubin concentrations associated (inversely) with ceftriaxone clearance. The 2 g three-times-weekly regimen achieved 98% probability to maintain unbound ceftriaxone concentrations ≥1 mg/L for a serum bilirubin of 5 µmol/L. Incremental accumulation of ceftriaxone was observed in those with bilirubin concentrations >5 µmol/L. Three-times-weekly regimens were less probable to achieve toxic exposures compared with once-daily regimens. Ceftriaxone clearance was increased by >10-fold during dialysis. CONCLUSIONS A novel 2 g three-times-weekly post-dialysis ceftriaxone regimen can be recommended for a bacterial infection with an MIC ≤1 mg/L. A 1 g three-times-weekly post-dialysis regimen is recommended for those with serum bilirubin ≥10 µmol/L. Administration of ceftriaxone during dialysis is not recommended.
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Affiliation(s)
- Danny Tsai
- Flinders Health and Medical Research Institute, College of Medicine and Public Health, Flinders University, Adelaide, SA, Australia
- UQ Centre for Clinical Research, University of Queensland, Brisbane, QLD, Australia
- Pharmacy Department, Alice Springs Hospital, Alice Springs, NT, Australia
| | - Betty B Zam
- Pharmacy Department, Alfred Health, Melbourne, VIC, Australia
| | - Carleigh Tongs
- Northern Territory Medical Program, College of Medicine and Public Health, Flinders University, Darwin, NT, Australia
| | - Fabian Chiong
- Department of Medicine, Alice Springs Hospital, Alice Springs, NT, Australia
| | - Cherian Sajiv
- Department of Nephrology, Alice Springs Hospital, Alice Springs, NT, Australia
| | - Basant Pawar
- Department of Nephrology, Alice Springs Hospital, Alice Springs, NT, Australia
| | - Aadith Ashok
- Department of Infectious Diseases, Alfred Health, Melbourne, VIC, Australia
| | - Brynley P Cooper
- Pharmacy Department, Alice Springs Hospital, Alice Springs, NT, Australia
| | - Steven Y C Tong
- Victorian Infectious Diseases Service, The Royal Melbourne Hospital at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia
- Department of Infectious Diseases, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia
| | - Sonja Janson
- Department of Infectious Diseases, Royal Darwin Hospital, Darwin, NT, Australia
| | - Steven C Wallis
- UQ Centre for Clinical Research, University of Queensland, Brisbane, QLD, Australia
| | - Jason A Roberts
- UQ Centre for Clinical Research, University of Queensland, Brisbane, QLD, Australia
- Department of Intensive Care Medicine, Royal Brisbane and Women's Hospital, Brisbane, QLD, Australia
- Department of Pharmacy, Royal Brisbane and Women's Hospital, Brisbane, QLD, Australia
- Herston Infectious Diseases Institute (HeIDI), Metro North Health, Brisbane, QLD, Australia
- Division of Anaesthesiology Critical Care Emergency and Pain Medicine, Nîmes University Hospital, University of Montpellier, Nîmes, France
| | - Suzanne L Parker
- UQ Centre for Clinical Research, University of Queensland, Brisbane, QLD, Australia
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Assessment of Piperacillin-Tazobactam-Meropenem Synergy against Serine Carbapenemase-Producing Enterobacterales Using Time-Kill Assays. Antimicrob Agents Chemother 2021; 65:AAC.02317-20. [PMID: 33468471 DOI: 10.1128/aac.02317-20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Accepted: 12/17/2020] [Indexed: 11/20/2022] Open
Abstract
Synergy between piperacillin-tazobactam and meropenem against KPC-producing Klebsiella pneumoniae was recently demonstrated. We sought to test the combination against a broader range of serine carbapenemase producers. We tested the combination against 10 KPC-producing Escherichia coli and 10 OXA-48 family-producing K. pneumoniae isolates. Antibiotic concentrations used are achievable in critically ill patients. The combination was synergistic against 7 of 10 KPC producers and 9 of 10 OXA-48 producers. There was no synergy detected in control isolates producing NDM-1.
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Editorial for the Special Issue: "Targeting β-Lactamases to Fight Bacterial Resistance to β-Lactam Antibiotics". Antibiotics (Basel) 2020; 9:antibiotics9060290. [PMID: 32481671 PMCID: PMC7344913 DOI: 10.3390/antibiotics9060290] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Accepted: 05/26/2020] [Indexed: 11/17/2022] Open
Abstract
In bacteria, a major resistance mechanism to β-lactam antibiotics is the production of one or more β-lactamase enzymes. β-Lactamases belong to two structurally and mechanistically unrelated families of enzymes, serine-β-lactamases (SBLs; classes A, C, and D) and metallo-β-lactamases (MBLs; class B). The interest in discovering novel inhibitors has recently renewed to counter the threat from newer β-lactamases, such as the extended spectrum β-lactamases (ESBLs) and carbapenemases, that are not inhibited by classical SBL inhibitors. Although resistance development is an ordinary evolutionary process, it has been significantly accelerated by the widespread and uncontrolled misuse of antibiotics and, nowadays, it represents one of the most relevant threats for human health.This Special Issue includes full research articles, brief reports and reviews focused on the targeting of b-lactamases to fight bacterial drug resistance.[...].
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