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Vanneste D, Gijsen M, Maertens J, Van Paesschen W, Debaveye Y, Wauters J, Spriet I. Ceftazidime-related neurotoxicity in a patient with renal impairment: a case report and literature review. Infection 2024; 52:1113-1123. [PMID: 38305827 DOI: 10.1007/s15010-023-02167-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Accepted: 12/22/2023] [Indexed: 02/03/2024]
Abstract
PURPOSE We present the case of a 67-year-old woman with severely reduced renal clearance suffering from ceftazidime-induced encephalopathy. Subsequently, we search the literature to review and describe the neurotoxicity of ceftazidime. METHODS A search string was developed to search PubMed for relevant cases from which relevant information was extracted. Using the collected data a ROC analysis was performed in R to determine a neurotoxicity threshold. RESULTS Our patient suffered from progressive loss of consciousness and myoclonic seizures, with improvements noted a few days after discontinuation of treatment. The dose was not appropriately reduced to take into account her reduced renal function. The highest ceftazidime concentration recorded was 234.9 mg/mL. Using the Naranjo score we found a probable relationship between our patient's encephalopathy and ceftazidime administration. In the literature we found a total of 32 similar cases, most of which also had some form of renal impairment. Using our collected data and ceftazidime concentrations provided in the literature, a ROC analysis provided a neurotoxicity threshold of 78 mg/L for ceftazidime neurotoxicity. CONCLUSION Ceftazidime-related neurotoxicity is a known issue, especially in patients with severe renal impairment. Yet no concrete toxicity threshold has been reported so far. We propose the first toxicity threshold for ceftazidime of 78 mg/L. Future prospective studies are needed to validate and optimize the neurotoxicity threshold as upper limit for ceftazidime therapeutic drug monitoring.
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Affiliation(s)
- Dorian Vanneste
- Clinical Pharmacology and Pharmacotherapy, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, 3000, Louvain, Belgium.
| | - Matthias Gijsen
- Clinical Pharmacology and Pharmacotherapy, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, 3000, Louvain, Belgium
- Pharmacy Department, UZ Leuven, 3000, Louvain, Belgium
| | - Johan Maertens
- Haematology Unit, UZ Leuven, 3000, Louvain, Belgium
- Laboratory for Clinical Microbiology, Department of Microbiology, Immunology and Transplantation, KU Leuven, 3000, Louvain, Belgium
| | - Wim Van Paesschen
- Neurology Department, UZ Leuven, 3000, Louvain, Belgium
- Laboratory for Epilepsy Research, Department of Neurosciences, KU Leuven, 3000, Louvain, Belgium
| | - Yves Debaveye
- Intensive Care Unit, UZ Leuven, 3000, Louvain, Belgium
- Laboratory for Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, 3000, Louvain, Belgium
| | - Joost Wauters
- Medical Intensive Care Unit, UZ Leuven, 3000, Louvain, Belgium
- Laboratory for Clinical Infectious and Inflammatory Diseases, Department of Microbiology, Immunology and Transplantation, KU Leuven, 3000, Louvain, Belgium
| | - Isabel Spriet
- Clinical Pharmacology and Pharmacotherapy, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, 3000, Louvain, Belgium
- Pharmacy Department, UZ Leuven, 3000, Louvain, Belgium
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Zavrelova A, Sima M, Malakova J, Rozsivalova P, Paterova P, Zak P, Visek B, Michalickova D, Slanar O, Radocha J. Superiority of ceftazidime off-label high-dose regimen in PK/PD target attainment during treatment of extensively drug-resistant Pseudomonas aeruginosa infections in cancer patients. Br J Clin Pharmacol 2023; 89:1452-1461. [PMID: 36422512 DOI: 10.1111/bcp.15612] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 11/06/2022] [Accepted: 11/21/2022] [Indexed: 11/25/2022] Open
Abstract
AIM The objective of this study was to evaluate off-label high-dose ceftazidime population pharmacokinetics in cancer patients with suspected or proven extensively drug-resistant (XDR) Pseudomonas aeruginosa infections and then to compare the achievement of the pharmacokinetic/pharmacodynamic (PK/PD) target after standard and off-label high-dose regimens using population model-based simulations. A further aim was to clinically observe the occurrence of adverse effects during the off-label high-dose ceftazidime treatment. METHODS In patients treated with off-label high-dose ceftazidime (3 g every 6 h), blood samples were collected and ceftazidime serum levels measured using LC-MS/MS. A pharmacokinetic population model was developed using a nonlinear mixed-effects modelling approach and Monte Carlo simulations were then used to compare standard and high-dose regimens for PK/PD target attainment. RESULTS A total of 14 cancer patients with serious infection suspected of XDR P. aeruginosa aetiology were eligible for PK analysis. XDR P. aeruginosa was confirmed in 10 patients as the causative pathogen. Population ceftazidime volume of distribution was 13.23 L, while clearance started at the baseline of 1.48 L/h and increased by 0.0076 L/h with each 1 mL/min/1.73 m2 of eGFR. High-dose regimen showed significantly higher probability of target attainment (i.e., 86% vs. 56% at MIC of 32 mg/L). This was translated into a very low mortality rate of 20%. Only one case of reversible neurological impairment was observed. CONCLUSION We proved the superiority of the ceftazidime off-label high-dose regimen in PK/PD target attainment with very low occurrence of adverse effects. The off-label high-dose regimen should be used to optimize treatment of XDR P. aeruginosa infections.
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Affiliation(s)
- Alzbeta Zavrelova
- 4th Department of Internal Medicine - Hematology, University Hospital Hradec Kralove and Faculty of Medicine in Hradec Kralove, Charles University, Hradec Kralove, Czech Republic
| | - Martin Sima
- Department of Pharmacology, First Faculty of Medicine, Charles University and General University Hospital in Prague, Prague, Czech Republic
| | - Jana Malakova
- Institute of Clinical Biochemistry, University Hospital Hradec Kralove and Charles University in Prague, Faculty of Medicine in Hradec Kralove, Hradec Kralove, Czech Republic
| | - Petra Rozsivalova
- Department of Clinical Pharmacy, Hospital Pharmacy, Faculty of Pharmacy in Hradec Kralove, Charles University and University Hospital Hradec Kralove, Hradec Kralove, Czech Republic
| | - Pavla Paterova
- Department of Clinical Microbiology, University Hospital Hradec Kralove and Faculty of Medicine in Hradec Kralove, Charles University, Hradec Kralove, Czech Republic
| | - Pavel Zak
- 4th Department of Internal Medicine - Hematology, University Hospital Hradec Kralove and Faculty of Medicine in Hradec Kralove, Charles University, Hradec Kralove, Czech Republic
| | - Benjamin Visek
- 4th Department of Internal Medicine - Hematology, University Hospital Hradec Kralove and Faculty of Medicine in Hradec Kralove, Charles University, Hradec Kralove, Czech Republic
| | - Danica Michalickova
- Department of Pharmacology, First Faculty of Medicine, Charles University and General University Hospital in Prague, Prague, Czech Republic
| | - Ondrej Slanar
- Department of Pharmacology, First Faculty of Medicine, Charles University and General University Hospital in Prague, Prague, Czech Republic
| | - Jakub Radocha
- 4th Department of Internal Medicine - Hematology, University Hospital Hradec Kralove and Faculty of Medicine in Hradec Kralove, Charles University, Hradec Kralove, Czech Republic
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Telles JP, Morales R, Yamada CH, Marins TA, D'Amaro Juodinis V, Sztajnbok J, Silva M, Bassetti BR, Albiero J, Tuon FF. Optimization of Antimicrobial Stewardship Programs Using Therapeutic Drug Monitoring and Pharmacokinetics-Pharmacodynamics Protocols: A Cost-Benefit Review. Ther Drug Monit 2023; 45:200-208. [PMID: 36622029 DOI: 10.1097/ftd.0000000000001067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Accepted: 10/08/2022] [Indexed: 01/10/2023]
Abstract
PURPOSE Antimicrobial stewardship programs are important for reducing antimicrobial resistance because they can readjust antibiotic prescriptions to local guidelines, switch intravenous to oral administration, and reduce hospitalization times. Pharmacokinetics-pharmacodynamics (PK-PD) empirically based prescriptions and therapeutic drug monitoring (TDM) programs are essential for antimicrobial stewardship, but there is a need to fit protocols according to cost benefits. The cost benefits can be demonstrated by reducing toxicity and hospital stay, decreasing the amount of drug used per day, and preventing relapses in infection. Our aim was to review the data available on whether PK-PD empirically based prescriptions and TDM could improve the cost benefits of an antimicrobial stewardship program to decrease global hospital expenditures. METHODS A narrative review based on PubMed search with the relevant studies of vancomycin, aminoglycosides, beta-lactams, and voriconazole. RESULTS TDM protocols demonstrated important cost benefit for patients treated with vancomycin, aminoglycosides, and voriconazole mainly due to reduce toxicities and decreasing the hospital length of stay. In addition, PK-PD strategies that used infusion modifications to meropenem, piperacillin-tazobactam, ceftazidime, and cefepime, such as extended or continuous infusion, demonstrated important cost benefits, mainly due to reducing daily drug needs and lengths of hospital stays. CONCLUSIONS TDM protocols and PK-PD empirically based prescriptions improve the cost-benefits and decrease the global hospital expenditures.
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Affiliation(s)
- João Paulo Telles
- - AC Camargo Cancer Center, Infectious Diseases Department, São Paulo
- - Laboratory of Emerging Infectious Diseases, Pontifical Catholic University of Paraná, Curitiba
| | - Ronaldo Morales
- - Clinical Pharmacokinetics Center, School of Pharmaceutical Sciences, University of São Paulo
- - Pediatric Intensive Care Unit, Department of Pediatrics, Hospital Sírio-Libanês. São Paulo
| | - Carolina Hikari Yamada
- - Laboratory of Emerging Infectious Diseases, Pontifical Catholic University of Paraná, Curitiba
- - Hospital Universitário Evangélico Mackenzie, Department of Infectious Diseases, Curitiba
| | - Tatiana A Marins
- - Hospital Israelita Albert Einstein, Department of Clinical Pharmacy, São Paulo
| | | | - Jaques Sztajnbok
- - Instituto de Infectologia Emílio Ribas, São Paulo
- - Instituto da Criança do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo (ICr/HC-FMUSP)
| | - Moacyr Silva
- - Hospital Israelita Albert Einstein, Department of Infection Prevention and Control, São Paulo
| | - Bil Randerson Bassetti
- - Hospital Santa Rita de Cássia, Department of Infectious Disease and Infection Control, Vitória ; and
| | - James Albiero
- - Universidade Estadual de Maringá, Pharmacy Department, Programa de Pós-Graduação em Assistência Farmacêutica, Maringá, Brazil
| | - Felipe Francisco Tuon
- - Laboratory of Emerging Infectious Diseases, Pontifical Catholic University of Paraná, Curitiba
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Passon SG, Schmidt AR, Wittmann M, Velten M, Baehner T. Evaluation of continuous ampicillin/sulbactam infusion in critically ill patients. Life Sci 2023; 320:121567. [PMID: 36907327 DOI: 10.1016/j.lfs.2023.121567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 03/04/2023] [Accepted: 03/07/2023] [Indexed: 03/12/2023]
Abstract
Continuous infusion (CI) of beta-lactam-antibiotics may improve pharmacodynamics in critically ill patients, but resulting concentrations have not been studied. Therapeutic drug monitoring is increasingly used to ensure antibiotic concentration. The aim of this study is to evaluate therapeutic ampicillin/sulbactam concentrations of a continuous infusion regimen. METHODS Medical records of all patients admitted to ICU between January 2019 and December 2020 were retrospectively reviewed. Each patient received a 2/1 g ampicillin/sulbactam loading dose, followed by a continuous infusion of 8/4 g per 24 h. Ampicillin serum concentrations were measured. Main outcomes were reaching of plasma concentrations breakpoint defined by minimum inhibitory concentration (MIC at 8 mg/l) and 4-fold MIC (MIC at 32 mg/l) during steady state of CI. RESULTS In 50 patients a total of 60 concentration measurements were performed. The first concentration was measured after a median of 29 h (IQR 21-61 h). Mean ampicillin concentration was 62.6 ± 39.1 mg/l. Furthermore, serum concentrations exceeded the defined MIC breakpoint in all measurements (100 %) and were above the 4-fold MIC in 43 analyses (71.1 %). However, patients suffering from acute kidney injury exhibited significant higher serum concentrations (81.1 ± 37.7 mg/l vs. 38.2 ± 24.8 mg/l; p < 0.001). Also, there was a negative correlation between ampicillin serum concentrations and GFR (r = -0.659; p < 0.001). CONCLUSION The described dosing regimen for ampicillin/sulbactam is safe with respect to the defined MIC breakpoints for ampicillin, and continuous subtherapeutic concentration is unlikely. However, with impaired renal function drug accumulation occurs, and with increased renal clearance, drug levels can be below the 4-fold MIC breakpoint.
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Affiliation(s)
- S G Passon
- Department of Anesthesiology and Intensive Care Medicine, St. Nikolaus Stiftshospital Andernach, Germany
| | - A R Schmidt
- Division of Pediatric Cardiac Anesthesia, Stanford University - School of Medicine, Palo Alto, CA, USA
| | - M Wittmann
- Department of Anesthesiology and Intensive Care Medicine, University Hospital Bonn, Germany
| | - M Velten
- Department of Anesthesiology and Intensive Care Medicine, University Hospital Bonn, Germany.
| | - T Baehner
- Department of Anesthesiology and Intensive Care Medicine, St. Nikolaus Stiftshospital Andernach, Germany; Department of Anesthesiology and Intensive Care Medicine, University Hospital Bonn, Germany
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Better Outcome of Off-Label High-Dose Ceftazidime in Hemato-Oncological Patients with Infections Caused by Extensively Drug-Resistant Pseudomonas Aeruginosa. Mediterr J Hematol Infect Dis 2023; 15:e2023001. [PMID: 36660352 PMCID: PMC9833305 DOI: 10.4084/mjhid.2023.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Accepted: 12/09/2022] [Indexed: 01/03/2023] Open
Abstract
Background P. aeruginosa sepsis in immunocompromised patients is a serious complication of cancer treatment, especially in the case of an Extensively Drug Resistant (XDR) pathogen. The aim of the study is to evaluate the efficacy of high-dose ceftazidime in the treatment of XDR P. aeruginosa infection and to compare it with the conventionally treated cohort in hemato-oncological patients. Methods We identified 27 patients with XDR P. aeruginosa infection during the 2008-2018 period, 16 patients served as a conventionally treated cohort with an antipseudomonal beta-lactam antibiotic in standard dose (cohort A), and 11 patients were treated with high-dose ceftazidime (cohort B). Most of the patients were neutropenic and under active treatment for their cancer in both cohorts. Results Mortality and related mortality were statistically significantly better for cohort B than cohort A; it was 18.2% and 9.1% for cohort B and 68.8% and 68.8% for cohort A, respectively. More patients in cohort A needed mechanical ventilation and renal replacement therapy, 75% and 50% for cohort A and 27.3% and 9.9% for cohort B, respectively. It corresponded well with the worst sequential organ failure score (SOFA) in cohort A compared to cohort B, 16 versus 7, respectively. Reversible neurotoxicity was seen only in two patients in cohort B. Conclusion Ceftazidime in high doses is a very potent antibiotic (ATB) for treating XDR P. aeruginosa infections in neutropenic cancer with acceptable toxicity.
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Toda M, Yoshifuji A, Hosoya K, Taguchi K, Komatsu M, Kobayashi E, Fujii K, Kato A, Hasegawa N, Matsumoto K, Ryuzaki M. Ceftazidime encephalopathy developed without the elevation of cerebrospinal fluid concentration of ceftazidime: A case report of two cases. J Infect Chemother 2022; 28:1667-1671. [PMID: 36028210 DOI: 10.1016/j.jiac.2022.08.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 07/30/2022] [Accepted: 08/08/2022] [Indexed: 10/15/2022]
Abstract
BACKGROUND Ceftazidime encephalopathy is reported to be caused by the repeated administration of ceftazidime in patients with renal impairment because of the high serum concentration of ceftazidime. Ceftazidime encephalopathy has been considered to be caused by the elevation of the cerebrospinal fluid (CSF) concentration. However, as no reports have measured CSF concentrations, the relationship with ceftazidime encephalopathy and CSF concentration has not been clarified. CASE PRESENTATION Case 1: An 80-year-old Japanese man under a combination therapy with peritoneal dialysis and hemodialysis, who had been treated for a cellulitis with ceftazidime, developed altered consciousness and was diagnosed as ceftazidime encephalopathy. His serum concentration of ceftazidime was elevated, but CSF concentration was only under 0.1 μg/mL. Case 2: An 88-year-old Japanese man with chronic kidney disease, who had been treated for a urinary tract infection with ceftazidime, developed altered consciousness and was diagnosed as ceftazidime encephalopathy. His serum concentration of ceftazidime was elevated, but CSF concentration was within the therapeutic range. However, his serum and CSF concentration of quinolinic acid was markedly increased. CONCLUSIONS Patients with renal failure are more likely to develop ceftazidime encephalopathy. We need to pay attention to the dosage of ceftazidime and to the appearance of neurological symptoms. Ceftazidime encephalopathy was considered to be caused by the high CSF concentration, but it could be caused by quinolinic acid as neurotoxic substance.
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Affiliation(s)
- Masataro Toda
- Division of Nephrology, Department of Internal Medicine, Tokyo Saiseikai Central Hospital, Tokyo, Japan
| | - Ayumi Yoshifuji
- Division of Nephrology, Department of Internal Medicine, Tokyo Saiseikai Central Hospital, Tokyo, Japan.
| | - Koji Hosoya
- Division of Nephrology, Department of Internal Medicine, Tokyo Saiseikai Central Hospital, Tokyo, Japan
| | - Kazuaki Taguchi
- Division of Practical Pharmacy, Keio University Faculty of Pharmacy, Tokyo, Japan
| | - Motoaki Komatsu
- Division of Nephrology, Department of Internal Medicine, Tokyo Saiseikai Central Hospital, Tokyo, Japan
| | - Emi Kobayashi
- Division of Nephrology, Department of Internal Medicine, Tokyo Saiseikai Central Hospital, Tokyo, Japan
| | - Kentaro Fujii
- Division of Nephrology, Department of Internal Medicine, Tokyo Saiseikai Central Hospital, Tokyo, Japan
| | - Ai Kato
- Division of Nephrology, Department of Internal Medicine, Tokyo Saiseikai Central Hospital, Tokyo, Japan
| | - Naoki Hasegawa
- Department of Infectious Disease, Keio University School of Medicine, Tokyo, Japan
| | - Kazuaki Matsumoto
- Division of Practical Pharmacy, Keio University Faculty of Pharmacy, Tokyo, Japan
| | - Munekazu Ryuzaki
- Division of Nephrology, Department of Internal Medicine, Tokyo Saiseikai Central Hospital, Tokyo, Japan
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Fanton D'Andon C, Correia P, Rigaill J, Kably B, Perinel-Ragey S, Launay M. Ceftazidime dosing in obese patients: is it time for more? Expert Opin Drug Metab Toxicol 2022; 18:277-284. [PMID: 35583387 DOI: 10.1080/17425255.2022.2080052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
INTRODUCTION Ceftazidime is used for the treatment of many bacterial infections, including severe P. aeruginosa infections. Like other beta-lactams, inter-individual variability in ceftazidime pharmacokinetics has been described. Due to its related pathophysiological modifications, obesity might influence ceftazidime pharmacokinetics. AREAS COVERED The objective of this review is to assess the current state of knowledge about the impact of obesity on ceftazidime treatment. A literature search was conducted on PubMed-MEDLINE (2016-2021) to retrieve pharmacokinetic studies published in English, matching the terms 'ceftazidime' AND 'pharmacokinetics.' EXPERT OPINION The impact of obesity on pharmacokinetics is generally poorly known, mainly because obese patients are often excluded from clinical studies. However, the published literature clearly shows that obese patients have significantly lower ceftazidime concentrations. This could be explained by increased volume of distribution and clearance. This low exposure represents a major factor of therapeutic failure, potentially fatal for critically ill patients. While further studies would be useful to better assess the magnitude and understanding of this variability, the use of higher doses of ceftazidime is needed in obese patients. Moreover, therapeutic drug monitoring for dose adaptation is of major interest for these patients, as the efficacy of ceftazidime seems to be directly related to its plasma concentration.
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Affiliation(s)
- Cornélie Fanton D'Andon
- - Gaz du Sang, Hôpital NordLaboratoire de Pharmacologie - Toxicologie , CHU de Saint-Etienne, France
| | - Patricia Correia
- Service de Médecine Intensive et Réanimation G, CHU de Saint-Etienne, Saint Etienne, France
| | - Josselin Rigaill
- Department of Infectious Agents and Hygiene, University-Hospital of Saint-Etienne, Saint-Etienne, France
| | - Benjamin Kably
- Laboratoire de Pharmacologie, Hôpital Européen Georges Pompidou, Paris, France
| | - Sophie Perinel-Ragey
- Service de Médecine Intensive et Réanimation G, CHU de Saint-Etienne, Saint Etienne, France
| | - Manon Launay
- - Gaz du Sang, Hôpital NordLaboratoire de Pharmacologie - Toxicologie , CHU de Saint-Etienne, France
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Possible Neurological Toxicity of Ceftazidime/Avibactam in Acute Kidney Injury. INFECTIOUS DISEASES IN CLINICAL PRACTICE 2021. [DOI: 10.1097/ipc.0000000000000986] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Veiga RP, Paiva JA. Pharmacokinetics-pharmacodynamics issues relevant for the clinical use of beta-lactam antibiotics in critically ill patients. Crit Care 2018; 22:233. [PMID: 30244674 PMCID: PMC6151903 DOI: 10.1186/s13054-018-2155-1] [Citation(s) in RCA: 114] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 08/08/2018] [Indexed: 12/15/2022] Open
Abstract
Antimicrobials are among the most important and commonly prescribed drugs in the management of critically ill patients and beta-lactams are the most common antibiotic class used. Critically ill patient's pathophysiological factors lead to altered pharmacokinetics and pharmacodynamics of beta-lactams.A comprehensive bibliographic search in PubMed database of all English language articles published from January 2000 to December 2017 was performed, allowing the selection of articles addressing the pharmacokinetics or pharmacodynamics of beta-lactam antibiotics in critically ill patients.In critically ill patients, several factors may increase volume of distribution and enhance renal clearance, inducing high intra- and inter-patient variability in beta-lactam concentration and promoting the risk of antibiotic underdosing. The duration of infusion of beta-lactams has been shown to influence the fT > minimal inhibitory concentration and an improved beta-lactam pharmacodynamics profile may be obtained by longer exposure with more frequent dosing, extended infusions, or continuous infusions.The use of extracorporeal support techniques in the critically ill may further contribute to this problem and we recommend not reducing standard antibiotic dosage since no drug accumulation was found in the available literature and to maintain continuous or prolonged infusion, especially for the treatment of infections caused by multidrug-resistant bacteria.Prediction of outcome based on concentrations in plasma results in overestimation of antimicrobial activity at the site of infection, namely in cerebrospinal fluid and the lung. Therefore, although no studies have assessed clinical outcome, we recommend using higher than standard dosing, preferably with continuous or prolonged infusions, especially when treating less susceptible bacterial strains at these sites, as the pharmacodynamics profile may improve with no apparent increase in toxicity.A therapeutic drug monitoring-guided approach could be particularly useful in critically ill patients in whom achieving target concentrations is more difficult, such as obese patients, immunocompromised patients, those infected by highly resistant bacterial strains, patients with augmented renal clearance, and those undergoing extracorporeal support techniques.
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Affiliation(s)
- Rui Pedro Veiga
- Centro Hospitalar São João, EPE – Intensive Care Department, Porto, Portugal
- Faculty of Medicine – University of Porto, Porto, Portugal
- Grupo Infeção e Sepsis, Porto, Portugal
| | - José-Artur Paiva
- Centro Hospitalar São João, EPE – Intensive Care Department, Porto, Portugal
- Faculty of Medicine – University of Porto, Porto, Portugal
- Grupo Infeção e Sepsis, Porto, Portugal
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Pinder N, Brenner T, Swoboda S, Weigand MA, Hoppe-Tichy T. Therapeutic drug monitoring of beta-lactam antibiotics - Influence of sample stability on the analysis of piperacillin, meropenem, ceftazidime and flucloxacillin by HPLC-UV. J Pharm Biomed Anal 2017; 143:86-93. [PMID: 28578254 DOI: 10.1016/j.jpba.2017.05.037] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 05/04/2017] [Accepted: 05/21/2017] [Indexed: 01/10/2023]
Abstract
INTRODUCTION Therapeutic drug monitoring (TDM) is a useful tool to optimize antibiotic therapy. Increasing interest in alternative dosing strategies of beta-lactam antibiotics, e.g. continuous or prolonged infusion, require a feasible analytical method for quantification of these antimicrobial agents. However, pre-analytical issues including sample handling and stability are to be considered to provide valuable analytical results. METHODS For the simultaneous determination of piperacillin, meropenem, ceftazidime and flucloxacillin, a high performance liquid chromatography (HPLC) method including protein precipitation was established utilizing ertapenem as internal standard. Long-term stability of stock solutions and plasma samples were monitored. Furthermore, whole blood stability of the analytes in heparinized blood tubes was investigated comparing storage under ambient conditions and 2-8°C. RESULTS A calibration range of 5-200μg/ml (piperacillin, ceftazidime, flucloxacillin) and 2-200μg/ml (meropenem) was linear with r2>0.999, precision and inaccuracy were <9% and <11%, respectively. The successfully validated HPLC assay was applied to clinical samples and stability investigations. At -80°C, plasma samples were stable for 9 months (piperacillin, meropenem) or 13 months (ceftazidime, flucloxacillin). Concentrations of the four beta-lactam antibiotics in whole blood tubes were found to remain within specifications for 8h when stored at 2-8°C but not at room temperature. CONCLUSIONS The presented method is a rapid and simple option for routine TDM of piperacillin, meropenem, ceftazidime and flucloxacillin. Whereas long-term storage of beta-lactam samples at -80°C is possible for at least 9 months, whole blood tubes are recommended to be kept refrigerated until analysis.
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Affiliation(s)
- Nadine Pinder
- Pharmacy Department, University Hospital Heidelberg, Im Neuenheimer Feld 670, 69120 Heidelberg, Germany; Department of Anaesthesiology, University Hospital Heidelberg, Im Neuenheimer Feld 110, 69120 Heidelberg, Germany.
| | - Thorsten Brenner
- Department of Anaesthesiology, University Hospital Heidelberg, Im Neuenheimer Feld 110, 69120 Heidelberg, Germany
| | - Stefanie Swoboda
- Pharmacy Department, University Hospital Heidelberg, Im Neuenheimer Feld 670, 69120 Heidelberg, Germany
| | - Markus A Weigand
- Department of Anaesthesiology, University Hospital Heidelberg, Im Neuenheimer Feld 110, 69120 Heidelberg, Germany
| | - Torsten Hoppe-Tichy
- Pharmacy Department, University Hospital Heidelberg, Im Neuenheimer Feld 670, 69120 Heidelberg, Germany
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Streit F, Perl T, Schulze MH, Binder L. Personalised beta-lactam therapy: basic principles and practical approach. ACTA ACUST UNITED AC 2016. [DOI: 10.1515/labmed-2016-0050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Abstract:Bacterial infections are potentially life-threatening diseases requiring effective antibiotic treatment right from the outset to achieve a favourable prognosis. Therapeutic success depends on the susceptibility of the bacterial pathogen, determined by the minimum inhibitory concentration (MIC), and the concentration of the antibiotic at the focus of infection, which is influenced by drug metabolism and pharmacokinetic (PK) factors. Beta-lactams are time-dependent antibiotics. Bacterial killing correlates with the duration of the drug concentration above the MIC of the pathogen. Critical illness is associated with major PK changes. This may lead to unexpected drug concentrations and unpredictable dose requirements differing significantly from standard dosages. Emerging dosing strategies are therefore based on PK/pharmacodynamic (PD) principles. Therapeutic drug monitoring (TDM) is increasingly playing a key role in antibiotic treatment optimisation in general and in beta-lactam therapy, in particular, notably in severely ill patients. Furthermore, evidence of the superiority of continuous beta-lactam infusions over shorter administration regimens is growing. Target drug concentrations have to be defined, considering MIC values especially in pathogens with limited susceptibility. For reliable TDM results, correct pre-analytical sample handling is indispensable. Personalised, TDM-guided therapy currently offers the most promising approach to assuring that beta-lactam treatment is effective, especially in critically ill patients.
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