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Abbinanti A, Witt DM, Saunders J, Jones AE, Young DC. Venous thromboembolism management in people with cystic fibrosis. Pediatr Pulmonol 2024; 59:584-591. [PMID: 38038058 DOI: 10.1002/ppul.26786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 11/06/2023] [Accepted: 11/17/2023] [Indexed: 12/02/2023]
Abstract
BACKGROUND Rates of venous thromboembolism (VTE) are increasing in people with cystic fibrosis (PwCF). Providers treating VTE in PwCF have reported low confidence concerning anticoagulant drug selection, dose, duration, and drug-drug interactions. As there are currently no published reports regarding management of VTE in PwCF, our objective was to describe the management of VTE in PwCF. METHODS PwCF and VTE at the University of Utah Health were identified through electronic medical record searches. Patients were categorized into one of three treatment groups: warfarin, direct oral anticoagulant (DOAC), and low molecular weight heparin (LMWH). The primary outcome was episodes of major bleeding. Secondary outcomes included clinically relevant nonmajor (CRNM) bleeding. RESULTS Nine PwCF with a total of 12 unique VTE episodes were included in the study, with all but one episode associated with a peripherally inserted central catheter (PICC). Of the 12 VTE cases, 25% were treated with warfarin, 50% with a DOAC, and 25% with LMWH. There were no episodes of major bleeding and only one episode of CRNM bleeding (Hemoptysis) in the LMWH group. All anticoagulant doses and durations generally followed guidelines for persons without CF. DOACs were the most common VTE treatment, at doses and duration consistent with guidelines for persons without CF, with no major or CRNM bleeding. CONCLUSION VTE treatment in PwCF is generally consistent with guidelines for persons without CF with low rates of bleeding. DOACs are a potential option for treatment of VTE in PwCF, but more research is needed.
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Affiliation(s)
- Alan Abbinanti
- Department of Pharmacy, Huntsman Mental Health Institute, University of Utah Health, Salt Lake City, Utah, USA
| | - Daniel M Witt
- Department of Pharmacotherapy, College of Pharmacy, University of Utah, Salt Lake City, Utah, USA
| | - John Saunders
- Department of Pharmacotherapy, College of Pharmacy, University of Utah, Salt Lake City, Utah, USA
| | - Aubrey E Jones
- Department of Pharmacotherapy, College of Pharmacy, University of Utah, Salt Lake City, Utah, USA
| | - David C Young
- Department of Pharmacotherapy, College of Pharmacy, University of Utah, Salt Lake City, Utah, USA
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VanElzakker MB, Tillman EM, Yonker LM, Ratai EM, Georgiopoulos AM. Neuropsychiatric adverse effects from CFTR modulators deserve a serious research effort. Curr Opin Pulm Med 2023; 29:603-609. [PMID: 37655981 PMCID: PMC10552811 DOI: 10.1097/mcp.0000000000001014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
PURPOSE OF REVIEW This review highlights the problem of neuropsychiatric adverse effects (AEs) associated with elexacaftor/tezacaftor/ivacaftor (ETI), current suboptimal mitigation approaches, a novel testable mechanistic hypothesis, and potential solutions requiring further research. RECENT FINDINGS Studies show that a minority of persons with cystic fibrosis (PwCF) initiating cystic fibrosis transmembrane conductance regulator (CFTR) modulators experience neuropsychiatric AEs including worsening mood, cognition, anxiety, sleep, and suicidality. The GABA-A receptor is a ligand-gated chloride channel, and magnetic resonance spectroscopy neuroimaging studies have shown that reduced GABA expression in rostral anterior cingulate cortex is associated with anxiety and depression. Recent research details the impact of peripheral inflammation and the gut-brain axis on central neuroinflammation. Plasma ETI concentrations and sweat chloride have been evaluated in small studies of neuropsychiatric AEs but not validated to guide dose titration or correlated with pharmacogenomic variants or safety/efficacy. SUMMARY Although ETI is well tolerated by most PwCF, some experience debilitating neuropsychiatric AEs. In some cases, these AEs may be driven by modulation of CFTR and chloride transport within the brain. Understanding biological mechanisms is a critical next step in identifying which PwCF are likely to experience AEs, and in developing evidence-based strategies to mitigate them, while retaining modulator efficacy.
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Alnezary FS, Almutairi MS, Gonzales-Luna AJ, Thabit AK. The Significance of Bayesian Pharmacokinetics in Dosing for Critically Ill Patients: A Primer for Clinicians Using Vancomycin as an Example. Antibiotics (Basel) 2023; 12:1441. [PMID: 37760737 PMCID: PMC10525617 DOI: 10.3390/antibiotics12091441] [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: 08/14/2023] [Revised: 09/06/2023] [Accepted: 09/08/2023] [Indexed: 09/29/2023] Open
Abstract
Antibiotic use is becoming increasingly challenging with the emergence of multidrug-resistant organisms. Pharmacokinetic (PK) alterations result from complex pathophysiologic changes in some patient populations, particularly those with critical illness. Therefore, antibiotic dose individualization in such populations is warranted. Recently, there have been advances in dose optimization strategies to improve the utilization of existing antibiotics. Bayesian-based dosing is one of the novel approaches that could help clinicians achieve target concentrations in a greater percentage of their patients earlier during therapy. This review summarizes the advantages and disadvantages of current approaches to antibiotic dosing, with a focus on critically ill patients, and discusses the use of Bayesian methods to optimize vancomycin dosing. The Bayesian method of antibiotic dosing was developed to provide more precise predictions of drug concentrations and target achievement early in therapy. It has benefits such as the incorporation of personalized PK/PD parameters, improved predictive abilities, and improved patient outcomes. Recent vancomycin dosing guidelines emphasize the importance of using the Bayesian method. The Bayesian method is able to achieve appropriate antibiotic dosing prior to the patient reaching the steady state, allowing the patient to receive the right drug at the right dose earlier in therapy.
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Affiliation(s)
- Faris S. Alnezary
- Department of Clinical and Hospital Pharmacy, College of Pharmacy, Taibah University, Madinah 41477, Saudi Arabia;
| | - Masaad Saeed Almutairi
- Department of Pharmacy Practice, College of Pharmacy, Qassim University, Qassim 51452, Saudi Arabia
| | - Anne J. Gonzales-Luna
- Department of Pharmacy Practice and Translational Research, University of Houston College of Pharmacy, Houston, TX 77204, USA;
| | - Abrar K. Thabit
- Department of Pharmacy Practice, Faculty of Pharmacy, King Abdulaziz University, 7027 Abdullah Al-Sulaiman Rd, Jeddah 21589, Saudi Arabia;
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Cui YF, Pan Y, Zhu MF, Jiao Z. Pharmacokinetic Evaluation of Tacrolimus in Chinese Adult Patients during the Early Stages Post-Lung Transplantation. J Pers Med 2023; 13:jpm13040656. [PMID: 37109042 PMCID: PMC10145266 DOI: 10.3390/jpm13040656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Revised: 03/27/2023] [Accepted: 04/07/2023] [Indexed: 04/29/2023] Open
Abstract
BACKGROUND Although tacrolimus has been widely used in patients undergoing lung transplantation, few studies have reported the pharmacokinetics of tacrolimus in Chinese patients after lung transplantation. Thus, we aimed to investigate the pharmacokinetics and influential factors in this patient cohort in the early stage after lung transplantation. METHODS We enrolled 14 adult lung transplant recipients who were treated with tacrolimus and then intensively collected blood samples within a 12-h dosing interval. The pharmacokinetic parameters of tacrolimus were calculated using non-compartmental analysis, and the influence of pathophysiological characteristics and CYP3A5*3 and CYP3A4*1G genotypes on the pharmacokinetics of tacrolimus was assessed. Using linear regression analysis, we investigated the correlation between tacrolimus concentration at different sampling points and measured the area under the time-concentration curve (AUC0-12h). RESULTS Geometric mean of apparent clearance (CL/F) was 18.13 ± 1.65 L/h in non-CYP3A5*3/*3 carriers, five times higher than that in CYP3A5*3/*3 carriers (p < 0.001). Furthermore, the tacrolimus concentration 4 h after administration had the strongest correlation with AUC0-12h (R2 = 0.979). CONCLUSION The pharmacokinetics of tacrolimus varied largely between patients during the early stage post-transplantation, which could be partially explained by CYP3A5*3 genetic polymorphisms.
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Affiliation(s)
- Yi-Fan Cui
- Department of Pharmacy, Shanghai Chest Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200030, China
- School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing 211198, China
| | - Yan Pan
- Department of Pharmacy, Shanghai Chest Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200030, China
| | - Min-Fang Zhu
- Department of Critical Care Medicine, Shanghai Chest Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200030, China
| | - Zheng Jiao
- Department of Pharmacy, Shanghai Chest Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200030, China
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Abdallah YEH, Chahal S, Jamali F, Mahmoud SH. Drug-disease interaction: Clinical consequences of inflammation on drugs action and disposition. JOURNAL OF PHARMACY & PHARMACEUTICAL SCIENCES : A PUBLICATION OF THE CANADIAN SOCIETY FOR PHARMACEUTICAL SCIENCES, SOCIETE CANADIENNE DES SCIENCES PHARMACEUTIQUES 2023; 26:11137. [PMID: 36942294 PMCID: PMC9990632 DOI: 10.3389/jpps.2023.11137] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Accepted: 01/23/2023] [Indexed: 02/07/2023]
Abstract
Inflammation is a culprit in many conditions affecting millions of people worldwide. A plethora of studies has revealed that inflammation and inflammatory mediators such as cytokines and chemokines are associated with altered expression and activity of various proteins such as those involved in drug metabolism, specifically cytochrome P450 enzymes (CYPs). Emphasis of most available reports is on the inflammation-induced downregulation of CYPs, subsequently an increase in their substrate concentrations, and the link between the condition and the inflammatory mediators such as interleukin-6 and tumor necrosis factor alpha. However, reports also suggest that inflammation influences expression and/or activity of other proteins such as those involved in the drug-receptor interaction. These multifaced involvements render the clinical consequence of the inflammation unexpected. Such changes are shown in many inflammatory conditions including rheumatoid arthritis, Crohn's disease, acute respiratory illnesses as well as natural processes such as aging, among others. For example, some commonly used cardiovascular drugs lose their efficacy when patients get afflicted with inflammatory conditions such as rheumatoid arthritis and Crohn's disease. Interestingly, this is despite increased concentration subsequent to reduced clearance. The observation is attributed to a simultaneous reduction in the expression of target receptor proteins such as the calcium and potassium channel and β-adrenergic receptor as well as the metabolic enzymes. This narrative review summarizes the current understanding and clinical implications of the inflammatory effects on both CYPs and drug-receptor target proteins.
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Guimbellot JS, Nichols DP, Brewington JJ. Novel Applications of Biomarkers and Personalized Medicine in Cystic Fibrosis. Clin Chest Med 2022; 43:617-630. [PMID: 36344070 DOI: 10.1016/j.ccm.2022.06.005] [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: 11/06/2022]
Abstract
As routine care in cystic fibrosis (CF) becomes increasingly personalized, new opportunities to further focus care on the individual have emerged. These opportunities are increasingly filled through research in tools aiding drug selection, drug monitoring and titration, disease-relevant biomarkers, and evaluation of therapeutic benefits. Herein, we will discuss such research tools presently being translated into the clinic to improve the personalization of care in CF.
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Affiliation(s)
- Jennifer S Guimbellot
- Department of Pediatrics, Division of Pulmonary and Sleep Medicine, Gregory Fleming James Cystic Fibrosis Research Center, University of Alabama at Birmingham; 1600 7th Avenue South, ACC 620, Birmingham, AL 35233, USA
| | - David P Nichols
- Department of Pediatrics, Division of Pulmonary Medicine, Seattle Children's Hospital, University of Washington School of Medicine, Building Cure, 1920 Terry Avenue, Office 4-209, Seattle, WA 98109, USA
| | - John J Brewington
- Department of Pediatrics, University of Cincinnati College of Medicine, 3230 Eden Avenue, Cincinnati, OH 45267, USA; Division of Pulmonary Medicine, Cincinnati Children's Hospital Medical Center, 3333 Burnet Avenue, MLC 2021, Cincinnati, OH 45229, USA.
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Abstract
Nontuberculous mycobacteria (NTM) are important pathogens, with a longitudinal prevalence of up to 20% within the cystic fibrosis (CF) population. Diagnosis of NTM pulmonary disease in people with CF (pwCF) is challenging, as a majority have NTM infection that is transient or indolent, without evidence of clinical consequence. In addition, the radiographic and clinical manifestations of chronic coinfections with typical CF pathogens can overlap those of NTM, making diagnosis difficult. Comprehensive care of pwCF must be optimized to assess the true clinical impact of NTM and to improve response to treatment. Treatment requires prolonged, multidrug therapy that varies depending on NTM species, resistance pattern, and extent of disease. With a widespread use of highly effective modulator therapy (HEMT), clinical signs and symptoms of NTM disease may be less apparent, and sensitivity of sputum cultures further reduced. The development of a disease-specific approach to the diagnosis and treatment of NTM infection in pwCF is a research priority, as a lifelong strategy is needed for this high-risk population.
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8
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Guimbellot JS, Ryan KJ, Anderson JD, Parker KL, Odom LV, Rowe SM, Acosta EP. Plasma and cellular ivacaftor concentrations in patients with cystic fibrosis. Pediatr Pulmonol 2022; 57:2745-2753. [PMID: 35927224 PMCID: PMC9588676 DOI: 10.1002/ppul.26093] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 06/29/2022] [Accepted: 07/25/2022] [Indexed: 11/08/2022]
Abstract
Access to cystic fibrosis transmembrane conductance regulator (CFTR) modulators has been gradually increasing for people with cystic fibrosis, the first of which was ivacaftor, a CFTR potentiator that is part of all clinically available modulator treatments. In this study, we hypothesized that the steady-state concentrations in blood and tissue are highly variable in patients taking ivacaftor in a real-world context, which may have an impact on the treatment approach. We collected nasal epithelial cells to estimate target site concentrations and blood samples to estimate pharmacokinetic parameters at a steady state. We found that patients on ivacaftor monotherapy have variable concentrations well above the maximal effective concentration and may maintain concentrations necessary for the clinical benefit even if dosing is reduced. We also are the first to provide detailed target site concentration data over time, which shows that tissue concentrations do not fluctuate significantly and do not correlate with plasma concentrations. These findings show that some patients may have higher-than-expected concentrations and may benefit from tailored dosing to balance clinical response with side effects or adherence needs.
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Affiliation(s)
- Jennifer S. Guimbellot
- Gregory Fleming James Cystic Fibrosis Research Center, University of Alabama at Birmingham (UAB), Birmingham, AL
- Department of Pediatrics, Division of Pulmonary and Sleep Medicine, UAB, Birmingham, AL
| | - Kevin J. Ryan
- Department of Pharmacology and Toxicology, Division of Clinical Pharmacology, UAB, Birmingham, AL
| | - Justin D. Anderson
- Department of Pediatrics, Division of Pulmonary and Sleep Medicine, UAB, Birmingham, AL
| | - Kennedy L. Parker
- Department of Pediatrics, Division of Pulmonary and Sleep Medicine, UAB, Birmingham, AL
| | - L. Victoria Odom
- Department of Pediatrics, Division of Pulmonary and Sleep Medicine, UAB, Birmingham, AL
| | - Steven M. Rowe
- Gregory Fleming James Cystic Fibrosis Research Center, University of Alabama at Birmingham (UAB), Birmingham, AL
- Department of Pediatrics, Division of Pulmonary and Sleep Medicine, UAB, Birmingham, AL
- Departments of Medicine and Cell Developmental and Integrative Biology, UAB, Birmingham, AL
| | - Edward P. Acosta
- Gregory Fleming James Cystic Fibrosis Research Center, University of Alabama at Birmingham (UAB), Birmingham, AL
- Department of Pharmacology and Toxicology, Division of Clinical Pharmacology, UAB, Birmingham, AL
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Ryan KJ, Guimbellot JS, Dowell AE, Reed-Walker KD, Kerstner-Wood CD, Anderson JD, Liu Z, Acosta EP. Quantitation of Cystic Fibrosis Triple Combination Therapy, Elexacaftor/Tezacaftor/Ivacaftor, in Human Plasma and Cellular Lysate. J Chromatogr B Analyt Technol Biomed Life Sci 2022; 1213:123518. [DOI: 10.1016/j.jchromb.2022.123518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 10/07/2022] [Accepted: 10/30/2022] [Indexed: 11/06/2022]
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10
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De Sutter P, Van Haeverbeke M, Van Braeckel E, Van Biervliet S, Van Bocxlaer J, Vermeulen A, Gasthuys E. Altered intravenous drug disposition in people living with cystic fibrosis: A meta‐analysis integrating top‐down and bottom‐up data. CPT Pharmacometrics Syst Pharmacol 2022; 11:951-966. [PMID: 35748042 PMCID: PMC9381904 DOI: 10.1002/psp4.12832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 05/20/2022] [Accepted: 06/02/2022] [Indexed: 11/20/2022] Open
Abstract
Cystic fibrosis (CF) has been linked to altered drug disposition in various studies. However, the magnitude of these changes, influencing factors, and underlying mechanisms remain a matter of debate. The primary aim of this work was therefore to quantify changes in drug disposition (top‐down) and the pathophysiological parameters known to affect pharmacokinetics (PKs; bottom‐up). This was done through meta‐analyses and meta‐regressions in addition to theoretical PK simulations. Volumes of distribution and clearances were found to be elevated in people living with CF. These increases were larger in studies which included patients with pulmonary exacerbations. Differences in clearance were smaller in more recent studies and when results were normalized to body surface area or lean body mass instead of body weight. For the physiological parameters investigated, measured glomerular filtration rate and serum cytokine concentrations were found to be elevated in people living with CF, whereas serum albumin and creatinine levels were decreased. Possible pathophysiological mechanisms for these alterations relate to renal hyperfiltration, increases in free fraction, and inflammation. No differences were detected for cardiac output, body fat, fat free mass, hematocrit, creatinine clearance, and the activity of drug metabolizing enzymes. These findings imply that, in general, lower total plasma concentrations of drugs can be expected in people living with CF, especially when pulmonary exacerbations are present. Given the potential effect of CF on plasma protein binding and the variability in outcome observed between studies, the clinical relevance of adapting existing dosage regimens should be evaluated on a case‐by‐case basis.
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Affiliation(s)
- Pieter‐Jan De Sutter
- Department of Bioanalysis, Laboratory of Medical Biochemistry and Clinical Analysis, Faculty of Pharmaceutical Sciences Ghent University Ghent Belgium
| | - Maxime Van Haeverbeke
- Department of Data Analysis and Mathematical Modelling, KERMIT Research Unit Ghent University Ghent Belgium
| | - Eva Van Braeckel
- Department of Respiratory Medicine Ghent University Hospital Ghent Belgium
- Department of Internal Medicine and Paediatrics, Faculty of Medicine and Health Sciences Ghent University Ghent Belgium
| | - Stephanie Van Biervliet
- Department of Internal Medicine and Paediatrics, Faculty of Medicine and Health Sciences Ghent University Ghent Belgium
- Department of Paediatric Gastroenterology, Hepatology and Nutrition Ghent University Hospital Ghent Belgium
| | - Jan Van Bocxlaer
- Department of Bioanalysis, Laboratory of Medical Biochemistry and Clinical Analysis, Faculty of Pharmaceutical Sciences Ghent University Ghent Belgium
| | - An Vermeulen
- Department of Bioanalysis, Laboratory of Medical Biochemistry and Clinical Analysis, Faculty of Pharmaceutical Sciences Ghent University Ghent Belgium
| | - Elke Gasthuys
- Department of Bioanalysis, Laboratory of Medical Biochemistry and Clinical Analysis, Faculty of Pharmaceutical Sciences Ghent University Ghent Belgium
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Lipp MA, Crass RL, Fitzgerald LJ, Patel TS, Simon RH, Lenhan BE, Han MK, Jia S. Acute kidney injury in cystic fibrosis patients treated with intravenous colistimethate sodium or tobramycin. J Antimicrob Chemother 2022; 77:2516-2521. [PMID: 35678460 DOI: 10.1093/jac/dkac187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 05/17/2022] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES Colistimethate sodium and tobramycin are important systemic antibiotics for treatment of cystic fibrosis (CF) pulmonary exacerbations but can induce acute kidney injury (AKI). We characterize the rate of AKI in CF patients treated with systemic colistimethate sodium compared with tobramycin. METHODS This single-centre, retrospective cohort study included hospitalized CF patients treated with IV colistimethate sodium or tobramycin. The primary outcome was AKI defined using the RIFLE criteria. Multivariate logistic regression using a mixed model was performed to identify variables that were independently associated with AKI. RESULTS Overall, 156 patients representing 507 care encounters were included. The OR of AKI was not increased with IV colistimethate sodium relative to IV tobramycin after adjusting for other potential predictor variables (aOR 1.00; 95% CI 0.16-6.03). The frequency of AKI was 9.5% across all encounters, 6.9% with IV colistimethate sodium and 9.9% with IV tobramycin, with RIFLE category R (risk) being the most common stage, accounting for 4.2% of encounters with IV colistimethate sodium and 9.2% with IV tobramycin. The concomitant use of another nephrotoxin (aOR 2.51; 95% CI 1.27-4.95) or the combination of vancomycin and piperacillin/tazobactam (aOR 5.95; 95% CI 2.05-17.3) were both associated with increased odds of AKI. CONCLUSIONS Systemic treatment with colistimethate sodium or tobramycin in the CF patient population is associated with a similar rate of nephrotoxicity. However, clinicians should be mindful of the increased risk for AKI in patients treated with either IV colistimethate sodium or IV tobramycin when used concurrently with other nephrotoxic agents, particularly the combination of vancomycin and piperacillin/tazobactam.
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Affiliation(s)
- Madeline A Lipp
- Department of Clinical Pharmacy and Therapeutics, University of Pittsburgh, Pittsburgh, PA, USA
| | - Ryan L Crass
- Ann Arbor Pharmacometrics Group, Ann Arbor, MI, USA
| | | | - Twisha S Patel
- Department of Pharmacy Services, Michigan Medicine, Ann Arbor, MI, USA
| | - Richard H Simon
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Blair E Lenhan
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - MeiLan K Han
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Shijing Jia
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
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12
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Grant JJ, McDade EJ, Zobell JT, Young DC. The indispensable role of pharmacy services and medication therapy management in cystic fibrosis. Pediatr Pulmonol 2022; 57 Suppl 1:S17-S39. [PMID: 34347382 DOI: 10.1002/ppul.25613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 07/24/2021] [Accepted: 08/02/2021] [Indexed: 11/06/2022]
Abstract
Care for people with cystic fibrosis (PWCF) is highly complex and requires a multidisciplinary approach where the pharmacist plays a vital role. The purpose of this manuscript is to serve as a guideline for pharmacists and pharmacy technicians who provide care for PWCF by providing background and current recommendations for the use of cystic fibrosis (CF)-specific medications in both the acute and ambulatory care settings. The article explores current literature surrounding the role of pharmacists and pharmacy technicians, proven pharmacy models to emulate, and pharmacokinetic idiosyncrasies unique to the CF population while also identifying areas of future research. Clinical recommendations for the use of CF-specific medications are broken down by organ system including mechanism of action, adverse events, dosages, and monitoring parameters. The article also includes quick reference tables essential to the acute and chronic medication therapy management of PWCF.
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Affiliation(s)
- Jonathan J Grant
- Department of Outpatient Pharmacy-Specialty Services, The John's Hopkins Hospital, Baltimore, Maryland, USA
| | - Erin J McDade
- Pharmacy Department, Texas Children's Hospital, Houston, Texas, USA
| | - Jeffery T Zobell
- Pharmacy Department, Intermountain Primary Children's Hospital, Salt Lake City, Utah, USA
| | - David C Young
- Department of Pharmacotherapy, University of Utah College of Pharmacy, Salt Lake City, Utah, USA
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13
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Woillard JB, Bouchet S, Fayon M, Marquet P, Monchaud C, Bui S. A Population Pharmacokinetic Modeling Approach to Determine the Efficacy of Intravenous Amikacin in Children with Cystic Fibrosis. Ther Drug Monit 2021; 43:499-504. [PMID: 33346630 DOI: 10.1097/ftd.0000000000000855] [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: 08/17/2020] [Accepted: 11/25/2020] [Indexed: 11/26/2022]
Abstract
BACKGROUND In children with cystic fibrosis (CF), the currently recommended amikacin dose ranges between 30 and 35 mg/kg/d; however, data supporting this dosing efficacy are lacking. In this article, the objectives were to develop a nonparametric pharmacokinetic population model for amikacin in children with CF and investigate the efficacy and toxicity at different dose rates for distinct minimum inhibitory concentration (MIC) clinical breakpoints using Monte Carlo simulations. METHODS Data from 94 children with CF (613 serum concentrations) from the Bordeaux University Hospital's CF-centre were analyzed. After determination of nonparametric pharmacokinetic population model parameters and associated influent covariates in Pmetrics, 1000 Monte Carlo simulations were performed for 7 different dose rates between 30 and 60 mg/kg/d, to predict the probability of obtaining peak serum amikacin ≥10 × MIC and trough level ≤2.5 mg/L, for MIC values between 1 and 16 mg/L. RESULTS The median (min-max) age and weight were 10 (0.3-17) years and 29 (6-71) kg, respectively, with only 2 children younger than 1 year of age. Body weight and creatinine clearance significantly impacted the amikacin volume of distribution and clearance. The mean relative bias/root mean squared error between observed and individual predicted concentrations was -0.68%/8.1%. Monte Carlo simulations showed that for sensitive bacteria with MICs ≤ 4, 30 mg/kg/d was most appropriate for a 100% success rate; for bacteria with MICs ≥ 8 [eg, Pseudomonas aeruginosa (MICamikacin = 8)], a dose of at least 40 mg/kg/d allowed a high success probability (90%), with a trough level below 2.5 mg/L. CONCLUSIONS For intermediate pathogens, a dose of at least 40 mg/kg/d can improve efficacy, with an acceptable calculated residual trough level in cases of normal or hyperfiltration. Because amikacin undergoes renal clearance, which is immature until 1 year of age, dosing recommendations for this age group may be markedly high, warranting cautious interpretation.
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Affiliation(s)
- Jean-Baptiste Woillard
- Department of Pharmacology and Toxicology, CHU Limoges
- IPPRITT, Université de Limoges
- INSERM, IPPRITT, U1248, Limoges
| | - Stéphane Bouchet
- CHU de Bordeaux, Hôpital Pellegrin, Service de Pharmacologie et Toxicologie
| | - Michael Fayon
- CHU de Bordeaux, Hôpital Pellegrin-Enfants, CRCM Pédiatrique and
- Université de Bordeaux, INSERM, Centre de Recherche Cardio-thoracique de Bordeaux (U1045), Centre d'Investigation Clinique (CIC1401), Bordeaux, France
| | - Pierre Marquet
- Department of Pharmacology and Toxicology, CHU Limoges
- IPPRITT, Université de Limoges
- INSERM, IPPRITT, U1248, Limoges
| | - Caroline Monchaud
- Department of Pharmacology and Toxicology, CHU Limoges
- IPPRITT, Université de Limoges
- INSERM, IPPRITT, U1248, Limoges
| | - Stéphanie Bui
- CHU de Bordeaux, Hôpital Pellegrin-Enfants, CRCM Pédiatrique and
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14
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Pharmacokinetics of Polymyxin B in Hospitalized Adults with Cystic Fibrosis. Antimicrob Agents Chemother 2021; 65:e0079221. [PMID: 34252297 DOI: 10.1128/aac.00792-21] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Background: The optimal polymyxin B dosage needed to achieve an efficacy target of 50-100 mg·h/L when treating multi-drug-resistant bacterial infections in adult cystic fibrosis (CF) patients is unclear. The pharmacokinetics of intravenous polymyxin B were evaluated to better inform dosing. Methods: This was a prospective, observational pharmacokinetic (PK) study of nine CF adults receiving intravenous polymyxin B as part of usual clinical care. Doses preceding PK sampling ranged from 50-100 mg every 12 hours. Five PK samples were collected following the fourth or fifth dose and concentrations of polymyxin subcomponents, B1 and B2, were quantified using Liquid Chromatography Mass Spectrometry (LC-MS). Population PK (NONMEM® software) analysis was performed using pooled polymyxin B1+B2 concentrations. Results: Participants were Caucasian, predominantly male, with mean age and weight of 31 years (range 21-57 years) and 58.0kg (range 38.3-70.4kg), respectively. A 1-compartment zero-order infusion and linear elimination model adequately described the data with estimated clearance and volume of distribution, 2.09 L/hr and 12.7 L, respectively, corresponding to a 4.1 hour mean half-life (t1/2). Although body weight was observed to influence the volume of distribution, a fixed dose of 75 mg every 12 hours was predicted to achieve the target steady-state exposure. Neurotoxicities were reported in all patients; acute kidney injury events in two patients. These events resolved within 2-4 days after discontinuing polymyxin B. Conclusions: Fixed maintenance dosing of polymyxin B without loading is predicted to achieve the targeted therapeutic exposure in CF adults. Treatment-limiting neurotoxicities are very common in this population.
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15
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Pharmacokinetics and pharmacodynamics of antibiotics in cystic fibrosis: a narrative review. Int J Antimicrob Agents 2021; 58:106381. [PMID: 34157401 DOI: 10.1016/j.ijantimicag.2021.106381] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 05/21/2021] [Accepted: 06/10/2021] [Indexed: 12/22/2022]
Abstract
Cystic fibrosis affects several organs, predisposing patients to severe bacterial respiratory infections, including those caused by methicillin-resistant Staphylococcus aureus. Cystic fibrosis is also associated with a wide spectrum of pathological changes that can significantly affect the absorption, distribution, metabolism, and/or elimination of several drugs, including antibacterial agents. Therefore, awareness of the pharmacokinetic derangements in patients with cystic fibrosis is mandatory for the optimisation of antibiotic therapy. This review discusses the basic principles of pharmacokinetics and the pathophysiology of the pharmacokinetics changes associated with cystic fibrosis; it also provides an update of available data for the most widely used antibiotics. Evidence accumulated in the last few years has clearly shown that a significant number of cystic fibrosis patients treated with conventional dosing schemes have sub-therapeutic antibiotic concentrations, increasing their risk of therapeutic failure and/or the emergence of resistant pathogens. Some proposals to optimise antibiotic therapies in this clinical setting based on therapeutic drug monitoring are also discussed.
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16
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CFTR Modulators: Does One Dose Fit All? J Pers Med 2021; 11:jpm11060458. [PMID: 34073663 PMCID: PMC8224731 DOI: 10.3390/jpm11060458] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2021] [Revised: 05/10/2021] [Accepted: 05/12/2021] [Indexed: 12/11/2022] Open
Abstract
For many people with cystic fibrosis (pwCF), CFTR modulators will be the cornerstone of their treatment. These modulators show robust treatment effects at group level in pwCF with specific mutations. The individual effect however, is variable. In this review we will explain reasons for reconsideration of dosing regimens of CFTR modulating therapy in order to improve treatment response and prevent side effects. Since the effect of a drug depends on pharmacodynamics and pharmacokinetics, pharmacodynamics and pharmacokinetic properties of CFTR modulators will be discussed. Pharmacokinetic-pharmacodynamic relationships will be used to gain insight in dosage response and exposure response relationships. To understand the cause of variation in drug exposure, pharmacokinetic properties that may change due to CF disease will be explained. We show that with current insight, there are conceivable situations that give reason for reconsideration of dosing regimens, however many questions need to be unravelled.
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17
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Martiniano SL, Wagner BD, Brennan L, Wempe MF, Anderson PL, Daley CL, Anthony M, Nick JA, Sagel SD. Pharmacokinetics of oral antimycobacterials and dosing guidance for Mycobacterium avium complex treatment in cystic fibrosis. J Cyst Fibros 2021; 20:772-778. [PMID: 34030986 DOI: 10.1016/j.jcf.2021.04.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Revised: 04/19/2021] [Accepted: 04/20/2021] [Indexed: 11/15/2022]
Abstract
BACKGROUND Treatment failure of Mycobacterium avium complex (MAC) pulmonary disease occurs in about 30% of people with cystic fibrosis (CF) and may be a result of abnormal drug concentrations. METHODS Prospective, cross-over, single-dose PK study of 20 pancreatic insufficient individuals with CF and 10 healthy controls (HC). CF subjects received simultaneous doses of oral azithromycin, ethambutol, and rifampin in the fasting state and with food and pancreatic enzymes, separated by two weeks. HC received fasting doses only. A non-compartmental model was used to estimate PK parameters of drugs and metabolites. RESULTS Azithromycin maximum concentration (Cmax ) was higher and rifampin Cmax was lower in fasting CF subjects compared to HC, while other PK measures, including those for ethambutol, were similar. Addition of food and enzymes did not improve the Cmax of the antimycobacterial drugs. Nineteen of 20 CF subjects had one or more abnormal Cmax z-scores in either the fasting or fed state (or both), when compared to HC. CONCLUSION PK profiles of azithromycin and ethambutol were similar between CF and HC, except azithromycin Cmax was slightly higher in people with CF after a single dose. Rifampin PK parameters were altered in persons with CF. Addition of food and enzymes in CF subjects did not improve PK parameters. Standard dosing guidelines should be used as a starting point for people with CF initiating MAC therapy and therapeutic drug monitoring should be routinely performed to prevent the possibility of treatment failure due to abnormal drug concentrations. CLINICAL TRIAL REGISTRATION ClinicalTrials.gov Identifier: NCT02372383 Prior abstract publication: 1. Martiniano S, Wagner B, Brennan L, Wempe M, Anderson P, Nick J, Sagel S. Pharmacokinetics of oral MAC antibiotics in cystic fibrosis. Am J Resp Crit Care Med A4842-A4842, 2017. 2. Martiniano SL, Wagner BD, Brennan L, Wempe MF, Anderson PL, Nick JA, Sagel SD. Pharmacokinetics of oral MAC antibiotics in cystic fibrosis. J Cyst Fibros 16: S52-53, 2017.
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Affiliation(s)
- Stacey L Martiniano
- Department of Pediatrics, Children's Hospital Colorado, University of Colorado Anschutz Medical Campus, 13123 E. 16th Ave. B-395 Aurora, CO 80045, United States.
| | - Brandie D Wagner
- Department of Biostatistics and Informatics, University of Colorado School of Public Health, Aurora, CO 80045, United States
| | - Laney Brennan
- Department of Pharmacy, Children's Hospital Colorado, Aurora, CO 80045, United States
| | - Michael F Wempe
- Department of Pharmaceutical Sciences, University of Colorado Skaggs School of Pharmacy and Pharmaceutical Sciences, Aurora, CO 80045, United States
| | - Peter L Anderson
- Department of Pharmaceutical Sciences, University of Colorado Skaggs School of Pharmacy and Pharmaceutical Sciences, Aurora, CO 80045, United States
| | - Charles L Daley
- Department of Medicine, National Jewish Health, Denver, CO and University of Colorado School of Medicine, Aurora, CO 80206, United States
| | - Meg Anthony
- Department of Pharmacy, Children's Hospital Colorado, Aurora, CO 80045, United States
| | - Jerry A Nick
- Department of Medicine, National Jewish Health, Denver, CO and University of Colorado School of Medicine, Aurora, CO 80206, United States
| | - Scott D Sagel
- Department of Pediatrics, Children's Hospital Colorado, University of Colorado Anschutz Medical Campus, 13123 E. 16th Ave. B-395 Aurora, CO 80045, United States
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18
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van der Meer R, Wilms EB, Sturm R, Heijerman HGM. Pharmacokinetic interactions between ivacaftor and cytochrome P450 3A4 inhibitors in people with cystic fibrosis and healthy controls. J Cyst Fibros 2021; 20:e72-e76. [PMID: 34006500 DOI: 10.1016/j.jcf.2021.04.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 04/11/2021] [Accepted: 04/12/2021] [Indexed: 11/28/2022]
Abstract
BACKGROUND Ivacaftor is currently the only CFTR potentiator approved and is increasingly used since the development of CFTR correctors. Ivacaftor is metabolized by CYP3A4 and therefore dose reduction is required when treating patients on ivacaftor with CYP3A4 inhibiting drugs. As this advice is based on studies in healthy volunteers and not in cystic fibrosis (CF) patients, we need to investigate this in both groups to be able to extrapolate these data to CF. METHODS A cohort of CF patients and healthy subjects were exposed to a single dose of ivacaftor in combination with a strong (ritonavir), moderate (clarithromycin) and mild (azithromycin) CYP3A4 inhibitor. Ivacaftor concentrations were measured in all blood samples in order to calculate the pharmacokinetic parameters for ivacaftor. RESULTS We found that exposure to ivacaftor was higher in healthy volunteers than in subjects with CF. However this difference was not statistically significant. No differences were observed in the interaction potential of CYP3A4 inhibitors between both study groups. The strong CYP3A4 inhibitor ritonavir, increased exposure to ivacaftor 7 times. CONCLUSION Our data support current recommendations for dose adjustment of ivacaftor in case of co-treatment with CYP3A4 inhibitors in people with CF. However, exposure to ivacaftor was higher in healthy subjects than in CF patients. Further study is needed to investigate the cause and implication of this difference.
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Affiliation(s)
- Renske van der Meer
- Department of Pulmonology and Adult CF Centre, Haga Hospital, Els Borst-Eilersplein 275, 2545 AA The Hague, Netherlands.
| | - Erik B Wilms
- Central Hospital Pharmacy, Charlotte Jacobslaan 70, 2545 AB The Hague, Netherlands
| | - Richart Sturm
- Central Hospital Pharmacy, Charlotte Jacobslaan 70, 2545 AB The Hague, Netherlands
| | - Harry G M Heijerman
- Department of Pulmonology and Adult CF Centre, University Medical Centre Utrecht, Heidelberglaan 100, 3584 CX Utrecht, Netherlands
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19
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Burke A, Smith D, Coulter C, Bell SC, Thomson R, Roberts JA. Clinical Pharmacokinetic and Pharmacodynamic Considerations in the Drug Treatment of Non-Tuberculous Mycobacteria in Cystic Fibrosis. Clin Pharmacokinet 2021; 60:1081-1102. [PMID: 33982266 DOI: 10.1007/s40262-021-01010-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/28/2021] [Indexed: 10/21/2022]
Abstract
Non-tuberculous mycobacteria (NTM) are an emerging group of pulmonary infectious pathogens of increasing importance to the management of patients with cystic fibrosis (CF). NTM include slow-growing mycobacteria such as Mycobacterium avium complex (MAC) and rapidly growing mycobacteria such as Mycobacterium abscessus. The incidence of NTM in the CF population is increasing and infection contributes to significant morbidity to the patient and costs to the health system. Treating M. abscessus requires the combination of multiple costly antibiotics for months, with potentially significant toxicity associated with treatment. Although international guidelines for the treatment of NTM infection in CF are available, there are a lack of robust pharmacokinetic studies in CF patients to inform dosing and drug choice. This paper aims to outline the pharmacokinetic and pharmacodynamic factors informing the optimal treatment of NTM infections in CF.
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Affiliation(s)
- Andrew Burke
- Thoracic Medicine, The Prince Charles Hospital, Brisbane, QLD, Australia.,Faculty of Medicine, The University of Queensland School of Medicine, Brisbane, QLD, Australia
| | - Daniel Smith
- Thoracic Medicine, The Prince Charles Hospital, Brisbane, QLD, Australia.,Faculty of Medicine, The University of Queensland School of Medicine, Brisbane, QLD, Australia
| | - Chris Coulter
- Thoracic Medicine, The Prince Charles Hospital, Brisbane, QLD, Australia.,Faculty of Medicine, The University of Queensland School of Medicine, Brisbane, QLD, Australia
| | - Scott C Bell
- Thoracic Medicine, The Prince Charles Hospital, Brisbane, QLD, Australia.,Faculty of Medicine, The University of Queensland School of Medicine, Brisbane, QLD, Australia.,QIMR Berghofer Medical Research Institute, Herston, QLD, Australia
| | - Rachel Thomson
- Thoracic Medicine, The Prince Charles Hospital, Brisbane, QLD, Australia.,Faculty of Medicine, The University of Queensland School of Medicine, Brisbane, QLD, Australia.,Immunology Department, Gallipoli Medical Research Institute, Brisbane, QLD, Australia
| | - Jason A Roberts
- Faculty of Medicine, University of Queensland Centre for Clinical Research, The University of Queensland, Brisbane, QLD, Australia. .,Department of Pharmacy, Royal Brisbane and Women's Hospital, Brisbane, QLD, Australia. .,Department of Intensive Care Medicine, Royal Brisbane and Women's Hospital, Brisbane, QLD, Australia. .,Division of Anaesthesiology Critical Care Emergency and Pain Medicine, Nîmes University Hospital, University of Montpellier, Nîmes, France.
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20
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Whitmore TJ, Yaw M, Lavender M, Musk M, Boan P, Wrobel J. A novel highly bio-available itraconazole formulation (SUBA®-Itraconazole) for anti-fungal prophylaxis in lung transplant recipients. Transpl Infect Dis 2021; 23:e13587. [PMID: 33590676 DOI: 10.1111/tid.13587] [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: 11/11/2020] [Revised: 01/28/2021] [Accepted: 02/07/2021] [Indexed: 11/30/2022]
Abstract
BACKGROUND Antifungal prophylaxis remains a mainstay of lung transplantation, given invasive fungal infection is a common and serious complication after lung transplantation. Choice of systemic agent to prevent invasive fungal infection varies between centers and funding of agents remains challenging. Our center has recently changed from posaconazole to a highly bioavailable formulation of itraconazole (SUBA®-itraconazole) at substantially reduced cost, but safety and toxicity require further assessment. A retrospective study of lung transplant patients receiving systemic antifungal prophylaxis from December 2016 through December 2019 following change from posaconazole to itraconazole as standard practice. 150 patients with lung transplants were managed in this time period, with 88 (59%) receiving at least 1 mold-active triazole during the study period. 48 (58%) of these patients received SUBA®-itraconazole; 68 (82%) received posaconazole and 10 (12%) received voriconazole. The average cost per patient during the study period was significantly lower on SUBA®-itraconazole (mean $1548/patient/6 month course) than posaconazole (mean $16 921.35/patient/6 month course). Target trough concentrations for prophylaxis of itraconazole > 0.5 mg/L and posaconazole > 0.7 mg/L were achieved on empiric dosing in 49% and 68% respectively. Overall trough itraconazole (0.50 vs 1.12 mg/L, P < .001) and posaconazole (1.37 vs 2.10 mg/L P < .001) concentrations were significantly lower in patients with cystic fibrosis. Calcineurin inhibitor dose changes on introduction or cessation were similar for SUBA®-itraconazole and posaconazole. Breakthrough invasive fungal infection and toxicity were rare. SUBA®-itraconazole is well-tolerated, associated with rare breakthrough invasive fungal infection, and lower cost. Prospective studies following general introduction are required to determine long-term safety, tolerability, and efficacy.
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Affiliation(s)
- Timothy James Whitmore
- Department of Infectious Diseases, Fiona Stanley Hospital, Perth, WA, Australia.,Department of Microbiology, PathWest Laboratory Medicine WA, Perth, WA, Australia.,Department of Respiratory Medicine, Fiona Stanley Hospital, Perth, WA, Australia
| | - Meow Yaw
- Department of Respiratory Medicine, Fiona Stanley Hospital, Perth, WA, Australia
| | - Melanie Lavender
- Department of Respiratory Medicine, Fiona Stanley Hospital, Perth, WA, Australia
| | - Michael Musk
- Department of Respiratory Medicine, Fiona Stanley Hospital, Perth, WA, Australia
| | - Peter Boan
- Department of Infectious Diseases, Fiona Stanley Hospital, Perth, WA, Australia.,Department of Microbiology, PathWest Laboratory Medicine WA, Perth, WA, Australia
| | - Jeremy Wrobel
- Department of Respiratory Medicine, Fiona Stanley Hospital, Perth, WA, Australia.,School of Medicine, University of Notre Dame Australia, Fremantle, WA, Australia
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21
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Fratoni AJ, Nicolau DP, Kuti JL. A guide to therapeutic drug monitoring of β-lactam antibiotics. Pharmacotherapy 2021; 41:220-233. [PMID: 33480024 DOI: 10.1002/phar.2505] [Citation(s) in RCA: 51] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Revised: 01/06/2021] [Accepted: 01/07/2021] [Indexed: 12/13/2022]
Abstract
Therapeutic drug monitoring (TDM) opens the door to personalized medicine, yet it is infrequently applied to β-lactam antibiotics, one of the most commonly prescribed drug classes in the hospital setting. As we continue to understand more about β-lactam pharmacodynamics (PD) and wide inter- and intra-patient variability in pharmacokinetics (PK), the utility of TDM has become increasingly apparent. For β-lactams, the time that free concentrations remain above the minimum inhibitory concentration (MIC) as a function of the dosing interval (%fT>MIC) has been shown to best predict antibacterial effect. Many studies have shown that β-lactam %fT>MIC exposures are often suboptimal across a wide variety of disease states and clinical settings. A limitation to implementing this practice is the general lack of understanding on how to best operationalize this intervention and interpret the results. The instrumentation and expertise needed to quantify β-lactams for TDM is rarely available locally, but certain laboratories advertise these services and perform them regularly. Familiarity with the modalities and nuances of antimicrobial susceptibility testing is crucial to establishing β-lactam concentration targets that meet the relevant exposure thresholds. Evaluation of these concentrations is best accomplished using population PK software and Bayesian modeling, for which a multitude of programs are available. While TDM of β-lactams has shown an ability to increase the rate of target attainment, there is currently limited evidence to suggest that it leads to improved clinical outcomes. Although consensus guidelines for β-lactam TDM do not exist in the United States, guidance would help to promote this important practice and better standardize the approach across institutions. Herein, we discuss the basis for β-lactam TDM, review supporting evidence, and provide guidance for implementation in specific patient populations.
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Affiliation(s)
- Andrew J Fratoni
- Center for Anti-infective Research and Development, Hartford Hospital, Hartford, Connecticut, USA
| | - David P Nicolau
- Center for Anti-infective Research and Development, Hartford Hospital, Hartford, Connecticut, USA
| | - Joseph L Kuti
- Center for Anti-infective Research and Development, Hartford Hospital, Hartford, Connecticut, USA
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22
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Antibiotics in Adult Cystic Fibrosis Patients: A Review of Population Pharmacokinetic Analyses. Clin Pharmacokinet 2021; 60:447-470. [PMID: 33447944 DOI: 10.1007/s40262-020-00970-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/23/2020] [Indexed: 12/26/2022]
Abstract
BACKGROUND Lower respiratory tract infections are common in adult patients with cystic fibrosis (CF) and are frequently caused by Pseudomonas aeruginosa, resulting in chronic lung inflammation and fibrosis. The progression of multidrug-resistant strains of P. aeruginosa and alterations in the pharmacokinetics of many antibiotics in CF make optimal antimicrobial therapy a challenge, as reflected by high between- and inter-individual variability (IIV). OBJECTIVES This review provides a synthesis of population pharmacokinetic models for various antibiotics prescribed in adult CF patients, and aims at identifying the most reported structural models, covariates and sources of variability influencing the dose-concentration relationship. METHODS A literature search was conducted using the PubMed database, from inception to August 2020, and articles were retained if they met the inclusion/exclusion criteria. RESULTS A total of 19 articles were included in this review. One-, two- and three-compartment models were reported to best describe the pharmacokinetics of various antibiotics. The most common covariates were lean body mass and creatinine clearance. After covariate inclusion, the IIV (range) in total body clearance was 27.2% (10.40-59.7%) and 25.9% (18.0-33.9%) for β-lactams and aminoglycosides, respectively. IIV in total body clearance was estimated at 36.3% for linezolid and 22.4% for telavancin. The IIV (range) in volume of distribution was 29.4% (8.8-45.9%) and 15.2 (11.6-18.0%) for β-lactams and aminoglycosides, respectively, and 26.9% for telavancin. The median (range) of residual variability for all studies, using a combined (proportional and additive) model, was 12.7% (0.384-30.80%) and 0.126 mg/L (0.007-1.88 mg/L), respectively. CONCLUSION This is the first review that highlights key aspects of different population pharmacokinetic models of antibiotics prescribed in adult CF patients, effectively proposing relevant information for clinicians and researchers to optimize antibiotic therapy in CF.
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23
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Akkerman-Nijland AM, Akkerman OW, Grasmeijer F, Hagedoorn P, Frijlink HW, Rottier BL, Koppelman GH, Touw DJ. The pharmacokinetics of antibiotics in cystic fibrosis. Expert Opin Drug Metab Toxicol 2020; 17:53-68. [PMID: 33213220 DOI: 10.1080/17425255.2021.1836157] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
INTRODUCTION Dosing of antibiotics in people with cystic fibrosis (CF) is challenging, due to altered pharmacokinetics, difficulty of lung tissue penetration, and increasing presence of antimicrobial resistance. AREAS COVERED The purpose of this work is to critically review original data as well as previous reviews and guidelines on pharmacokinetics of systemic and inhaled antibiotics in CF, with the aim to propose strategies for optimization of antibacterial therapy in both children and adults with CF. EXPERT OPINION For systemic antibiotics, absorption is comparable in CF patients and non-CF controls. The volume of distribution (Vd) of most antibiotics is similar between people with CF with normal body composition and healthy individuals. However, there are a few exceptions, like cefotiam and tobramycin. Many antibiotic class-dependent changes in drug metabolism and excretion are reported, with an increased total body clearance for ß-lactam antibiotics, aminoglycosides, fluoroquinolones, and trimethoprim. We, therefore, recommend following class-specific guidelines for CF, mostly resulting in higher dosages per kg bodyweight in CF compared to non-CF controls. Higher local antibiotic concentrations in the airways can be obtained by inhalation therapy, with which eradication of bacteria may be achieved while minimizing systemic exposure and risk of toxicity.
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Affiliation(s)
- Anne M Akkerman-Nijland
- Department of Pediatric Pulmonology and Pediatric Allergology, Beatrix Children's Hospital, University of Groningen, University Medical Center Groningen , Groningen, The Netherlands.,Groningen Research Institute for Asthma and COPD (GRIAC), University of Groningen, University Medical Center Groningen , Groningen, The Netherlands
| | - Onno W Akkerman
- Department of Pulmonary Diseases and Tuberculosis, University of Groningen, University Medical Center Groningen , Groningen, The Netherlands
| | - Floris Grasmeijer
- Department of Pharmacy, PureIMS B.V , Roden, The Netherlands.,Department of Pharmaceutical Technology and Biopharmacy, University of Groningen , Groningen, The Netherlands
| | - Paul Hagedoorn
- Department of Pharmaceutical Technology and Biopharmacy, University of Groningen , Groningen, The Netherlands
| | - Henderik W Frijlink
- Department of Pharmaceutical Technology and Biopharmacy, University of Groningen , Groningen, The Netherlands
| | - Bart L Rottier
- Department of Pediatric Pulmonology and Pediatric Allergology, Beatrix Children's Hospital, University of Groningen, University Medical Center Groningen , Groningen, The Netherlands.,Groningen Research Institute for Asthma and COPD (GRIAC), University of Groningen, University Medical Center Groningen , Groningen, The Netherlands
| | - Gerard H Koppelman
- Department of Pediatric Pulmonology and Pediatric Allergology, Beatrix Children's Hospital, University of Groningen, University Medical Center Groningen , Groningen, The Netherlands.,Groningen Research Institute for Asthma and COPD (GRIAC), University of Groningen, University Medical Center Groningen , Groningen, The Netherlands
| | - Daniel J Touw
- Groningen Research Institute for Asthma and COPD (GRIAC), University of Groningen, University Medical Center Groningen , Groningen, The Netherlands.,Department of Clinical Pharmacy and Pharmacology, University of Groningen, University Medical Center Groningen , Groningen, The Netherlands
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Albright JC, Houck AP, Pettit RS. Effects of CFTR modulators on pharmacokinetics of tobramycin during acute pulmonary exacerbations in the pediatric cystic fibrosis population. Pediatr Pulmonol 2020; 55:2662-2666. [PMID: 32568427 DOI: 10.1002/ppul.24917] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 06/16/2020] [Accepted: 06/18/2020] [Indexed: 11/06/2022]
Abstract
BACKGROUND Individuals with cystic fibrosis (CF) require higher dosages of aminoglycosides due to an increased volume of distribution (Vd ) and clearance. Optimal dosing of aminoglycosides in the CF population is essential as repeated exposure to aminoglycosides during acute pulmonary exacerbations increases risk of nephrotoxicity and ototoxicity. To date, no studies have evaluated whether chronic cystic fibrosis transmembrane conductance regulator (CFTR) modulator therapy affects pharmacokinetics of aminoglycoside antibiotics in patients with CF. The objective of this study was to determine if the addition of a CFTR modulator affects elimination rate (Ke ) for intravenously administered tobramycin in the pediatric CF population. METHODS This retrospective study included patients aged 2 to 18 years with CF receiving chronic therapy with a CFTR modulator. Patients included had an admission both pre- and post-chronic CFTR modulator therapy during which they received therapy with IV tobramycin. RESULTS Thirty-four patients were included in the study. The median time between pre- and post-modulator admissions was 16.5 (13.8) months. Duration of CFTR modulator therapy before post-modulator admission was a median of 8 (10.3) months. There was no significant difference in Ke (hr-1 ) between pre- and post-modulator therapy, 0.41 (0.21) pre and 0.39 (0.09) post (P = .5). Vd and peak concentration were similar between both groups. There was no difference in nephrotoxicity as defined by the pRIFLE criteria (P = .25). CONCLUSIONS The pharmacokinetic parameters of intravenously administered tobramycin during admission for acute pulmonary exacerbation do not appear to change significantly after initiating chronic therapy with a CFTR modulator. Empiric dose adjustments for patients on CFTR modulators are not recommended.
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Affiliation(s)
- Jared C Albright
- Department of Pharmacy, Riley Hospital for Children at IU Health, Indianapolis, Indiana
| | - Andrew P Houck
- Department of Pharmacy, Riley Hospital for Children at IU Health, Indianapolis, Indiana
| | - Rebecca S Pettit
- Department of Pharmacy, Riley Hospital for Children at IU Health, Indianapolis, Indiana
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25
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Crass RL, Pai MP. Optimizing Estimated Glomerular Filtration Rate to Support Adult to Pediatric Pharmacokinetic Bridging Studies in Patients with Cystic Fibrosis. Clin Pharmacokinet 2020; 58:1323-1332. [PMID: 30972695 DOI: 10.1007/s40262-019-00761-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
BACKGROUND The estimated glomerular filtration rate (eGFR) is often used to model drug clearance (CL) and scale doses across age and body size. Over their lifetime, patients with cystic fibrosis (CF) receive repeated courses of tobramycin, an antibiotic with eGFR-dependent CL, for the treatment of pulmonary exacerbations. Tobramycin population pharmacokinetic (PK) modeling can be used to decipher the best approach to define eGFR for pediatric bridging studies. METHODS Inpatients with CF who received intravenous tobramycin between 1 January 2006 and 30 May 2018 were eligible for inclusion. Encounters without tobramycin concentration measurement or missing covariate data were excluded. Population PK analysis was performed using NONMEM.Covariate models were built following identification of the base model, with specific emphasis on the effect of different methods of estimating renal function as a covariate of tobramycin CL. RESULTS A total of 296 CF patients contributed 1029 care encounters (420 pediatric, 609 adult) and 4352 tobramycin concentrations to this analysis. The median (minimum, maximum) age at encounter was 19 years (0.2, 60), with serum creatinine of 0.60 mg/dL (0.10, 3.41). A two-compartment model best described the observed data, with height and eGFR as significant covariates of tobramycin CL. eGFR was best modeled using a combination of the modified Schwartz and Chronic Kidney Disease Epidemiology Collaboration (CKDEPI) equations expressed in absolute units. CONCLUSIONS The CKDEPI equation bridges PK data generated in adults to adolescents with CF better than the current regulatory standard. The eGFR should be expressed in absolute units (mL/min) for PK analyses.
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Affiliation(s)
- Ryan L Crass
- Department of Clinical Pharmacy, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, MI, 48109, USA
| | - Manjunath P Pai
- Department of Clinical Pharmacy, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, MI, 48109, USA.
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26
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De Sutter PJ, Gasthuys E, Van Braeckel E, Schelstraete P, Van Biervliet S, Van Bocxlaer J, Vermeulen A. Pharmacokinetics in Patients with Cystic Fibrosis: A Systematic Review of Data Published Between 1999 and 2019. Clin Pharmacokinet 2020; 59:1551-1573. [DOI: 10.1007/s40262-020-00932-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Romano MT, Premraj S, Bray JM, Murillo LC. Ceftolozane/tazobactam for pulmonary exacerbation in a 63-year-old cystic fibrosis patient with renal insufficiency and an elevated MIC to Pseudomonas aeruginosa. IDCases 2020; 21:e00830. [PMID: 32489878 PMCID: PMC7256659 DOI: 10.1016/j.idcr.2020.e00830] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 05/07/2020] [Accepted: 05/14/2020] [Indexed: 11/26/2022] Open
Abstract
Ceftolozane/tazobactam was successfully used in an adult CF patient with CKD and an elevated MIC for P. aeruginosa in culture. Therapeutic drug monitoring can be useful to validate dosing, particularly with newer antimicrobials that do not have well established dosing in cystic fibrosis. Higher serum concentrations and PK/PD targets may help to preserve susceptibility of Pseudomonas aeruginosa, but more studies are needed.
Cystic fibrosis (CF) is a progressive genetic disorder caused by mutations in a gene encoding the cystic fibrosis transmembrane regulator (CFTR) protein leading to persistent and difficult to treat lower airway infections. Multi-drug resistant Pseudomonas aeruginosa is becoming increasingly more common as a cause of pulmonary exacerbations, and newer agents such as ceftolozane/tazobactam (C/T) are being sought for treatment. There is currently little published data regarding its use in cystic fibrosis, particularly in the setting of reduced renal clearance. This report details the case of a 63-year-old female with cystic fibrosis and chronic kidney disease stage III (estimated creatinine clearance of 25−30 ml/min, Cockroft-Gault) who was successfully treated for a pulmonary exacerbation with C/T 3 g (2000 mg/1000 mg) infused intravenously every 8 h when the P. aeruginosa minimum inhibitory concentration (MIC) was elevated at 8 mcg/mL. Serum samples were collected to determine concentrations by a validated high-performance liquid chromatography assay. The steady state 1-hr post-infusion peak (Cmax) and trough (Cmin) concentrations for ceftolozane were 145.04 mcg/mL and 82.08 mcg/mL, and 15.93 mcg/mL and 3.20 mcg/mL for tazobactam, respectively. The patient’s symptoms resolved and her lung function returned to baseline. She completed 14 days of therapy and tolerated the infusion well without any infusion-related or adverse events.
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Affiliation(s)
| | - Sasha Premraj
- Ascension Sacred Heart Hospital, Pensacola, FL, United States
| | - John M Bray
- Adult Cystic Fibrosis Center, Pensacola Lung Group, Pensacola, FL, United States
| | - Luis C Murillo
- Adult Cystic Fibrosis Center, Pensacola Lung Group, Pensacola, FL, United States
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Cicali B, Long T, Kim S, Cristofoletti R. Assessing the impact of cystic fibrosis on the antipyretic response of ibuprofen in children: Physiologically-based modeling as a candle in the dark. Br J Clin Pharmacol 2020; 86:2247-2255. [PMID: 32335930 DOI: 10.1111/bcp.14326] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Revised: 04/13/2020] [Accepted: 04/15/2020] [Indexed: 01/21/2023] Open
Abstract
AIM The goal of this study is to present the utility of quantitative modelling for extrapolation of drug safety and efficacy to underrepresented populations in controlled clinical trials. To illustrate this, the stepwise development of an integrated disease/pharmacokinetics/pharmacodynamics model of antipyretic efficacy of ibuprofen in children with cystic fibrosis (CF) is presented along with therapy optimization suggestions. METHOD Published clinical trials, in vitro data, and drug physiochemical properties were used to develop an ibuprofen-mediated antipyresis model for febrile children also having CF. Workflow included first developing a mechanistic absorption model using in vitro-in vivo extrapolation followed by physiologically-based pharmacokinetic (PBPK) modelling. The verified PBPK model was then scaled to paediatric patients with CF. Once verified, the PBPK model was linked to an indirect response model of antipyresis for simulation of the overall antipyretic efficacy of ibuprofen in CF children. RESULTS Model simulations showed therapeutic inequivalence between healthy children and paediatric patients with CF; Cmax and AUC decreased by 39% (32-46%) and 44% (36-52%), respectively, in patients. Further, and in agreement with literature reports, predicted pharmacodynamics time courses suggest a slower onset and faster offset of action in patients compared to healthy children, 30 and 60 minutes, respectively. Exploratory simulations suggest an increase in dosing frequency for CF children as a better therapeutic strategy. CONCLUSION Model-informed approaches to leveraging knowledge obtained throughout the life cycle of drug development may play a key role in extrapolating drug efficacy and safety to underrepresented populations.
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Affiliation(s)
- Brian Cicali
- Center for Pharmacometrics and Systems Pharmacology, Department of Pharmaceutics, College of Pharmacy, University of Florida, Orlando, FL, USA
| | - Tao Long
- Center for Pharmacometrics and Systems Pharmacology, Department of Pharmaceutics, College of Pharmacy, University of Florida, Orlando, FL, USA
| | - Sarah Kim
- Center for Pharmacometrics and Systems Pharmacology, Department of Pharmaceutics, College of Pharmacy, University of Florida, Orlando, FL, USA
| | - Rodrigo Cristofoletti
- Center for Pharmacometrics and Systems Pharmacology, Department of Pharmaceutics, College of Pharmacy, University of Florida, Orlando, FL, USA
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Thirion DJG, Pasche V, Matouk E, Marsot A. Amikacin nomogram for treatment of adult cystic fibrosis exacerbations based on an external evaluation of a population pharmacokinetic model. Pediatr Pulmonol 2020; 55:1154-1160. [PMID: 32119197 DOI: 10.1002/ppul.24689] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Accepted: 02/04/2020] [Indexed: 01/10/2023]
Abstract
BACKGROUND In patients with cystic fibrosis (CF), amikacin is the alternative for the treatment of acute pulmonary exacerbations associated with pathogens resistant to tobramycin. Population pharmacokinetic (PK) models of amikacin in adult patients with CF have been previously published. However, current dosing recommendations remain disputed (Illamola et al. Clin Pharmacokinet. 2018;57(10):1217-1228). We perform here the first external evaluation of a published amikacin adult CF population PK model and propose a dosing nomogram for initial dosing. METHODS We retrospectively collected demographic, biological, and clinical data from the medical records of adult patients who had received intravenous amikacin. To assess the predictive performance of this model we applied visual comparison of predictions to observations, calculation of bias and inaccuracy, and simulation-based diagnostics. Monte Carlo simulations from the evaluated model were used to compare maximum concentration/minimum inhibitory concentration achieved with different dosing regimens. RESULTS A total of 91 concentrations from 19 adult patients with CF were collected for external evaluation. The model predicted amikacin concentrations with reasonable bias (7.2% [95% confidence interval, CI: -0.7% to 15.0%]) and inaccuracy (18.2% [95% CI: 12.0%-24.4%]). Our simulations with this model suggest that administered amikacin doses must be adjusted to creatinine clearance and also adjusted to body weight (doses from 20 to 45 mg/kg/d). According to these simulations, we developed the Montreal amikacin nomogram to optimize amikacin dosing regimens in patients with CF. CONCLUSION In conclusion, we developed the first nomogram to optimize initial amikacin dosing regimens in patients with CF based on this external evaluation of a recently published amikacin population PK model.
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Affiliation(s)
- Daniel J G Thirion
- Faculté de Pharmacie, Université de Montréal, Montréal, Québec, Canada.,Department of Pharmacy, McGill University Health Center, Montréal, Québec, Canada
| | - Valérian Pasche
- Faculté de Pharmacie, Université de Montréal, Montréal, Québec, Canada.,Laboratoire de suivi thérapeutique pharmacologique et pharmacocinétique, Faculté de Pharmacie, Université de Montréal, Montréal, Québec, Canada
| | - Elias Matouk
- Adult Cystic Fibrosis Clinic, Montreal Chest Institute, McGill University, Montréal, Québec, Canada.,McGill University Health Center Research Institute, Montréal, Québec, Canada.,Department of Medicine, McGill University, Montréal, Québec, Canada
| | - Amélie Marsot
- Faculté de Pharmacie, Université de Montréal, Montréal, Québec, Canada.,Laboratoire de suivi thérapeutique pharmacologique et pharmacocinétique, Faculté de Pharmacie, Université de Montréal, Montréal, Québec, Canada
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Impact of CF on the Kidneys. Respir Med 2020. [DOI: 10.1007/978-3-030-42382-7_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Pharmacokinetics of Telavancin in Adult Patients with Cystic Fibrosis during Acute Pulmonary Exacerbation. Antimicrob Agents Chemother 2019; 64:AAC.01914-19. [PMID: 31685468 DOI: 10.1128/aac.01914-19] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 10/25/2019] [Indexed: 02/03/2023] Open
Abstract
Adults with cystic fibrosis (CF) frequently harbor Staphylococcus aureus, which is increasingly antibiotic resistant. Telavancin is a once-daily rapidly bactericidal antibiotic active against methicillin-, linezolid-, and ceftaroline-resistant S. aureus Because CF patients experience alterations in pharmacokinetics, the optimal dose of telavancin in this population is unknown. Adult CF patients (n = 18) admitted for exacerbations received 3 doses of telavancin 7.5 mg/kg of body weight (first 6 patients) or 10 mg/kg (final 12 patients) every 24 h (q24h). Population pharmacokinetic models with and without covariates were fitted using the nonparametric adaptive grid algorithm in Pmetrics. The final model was used to perform 5,000-patient Monte Carlo simulations for multiple telavancin doses. The best fit was a 2-compartment model describing the volume of distribution of the central compartment (Vc ) as a multiple of total body weight (TBW) and the volume of distribution of the central compartment scaled to total body weight (V θ) normalized by the median observed value (Vc = V θ × TBW/52.1) and total body clearance (CL) as a linear function of creatinine clearance (CRCL) (CL = CLNR + CLθ × CRCL), where CLNR represents nonrenal clearance and CLθ represents the slope term on CRCL to estimate renal clearance. The mean population parameters were as follows: V θ, 4.92 ± 0.76 liters · kg-1; CLNR, 0.59 ± 0.30 liters · h-1; CLθ, 5.97 × 10-3 ± 1.24 × 10-3; Vp (volume of the peripheral compartment), 3.77 ± 1.41 liters; Q (intercompartmental clearance), 4.08 ± 2.17 liters · h-1 The free area under the concentration-time curve (fAUC) values for 7.5 and 10 mg/kg were 30 ± 4.6 and 52 ± 12 mg · h/liter, respectively. Doses of 7.5 mg/kg and 10 mg/kg achieved 76.5% and 100% probability of target attainment (PTA) at a fAUC/MIC threshold of >215, respectively, for MIC of ≤0.12 mg/liter. The probabilities of reaching the acute kidney injury (AKI) threshold AUC (763 mg · h · liter-1) for these doses were 0% and 0.96%, respectively. No serious adverse events occurred. Telavancin 10 mg/kg yielded optimal PTA and minimal risk of AKI, suggesting that this FDA-approved dose is appropriate to treat acute pulmonary exacerbations in CF adults. (The clinical trial discussed in this study has been registered at ClinicalTrials.gov under identifier NCT03172793.).
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Abstract
PURPOSE OF REVIEW Due to continuous development of new drugs and better treatment strategies, survival of patients with cystic fibrosis has changed dramatically. Recently, targeted therapy of cystic fibrosis transmembrane conductance regulator (CFTR) modulators have become available. Despite these promising developments, treatment of this complex multiorgan disease constitutes a high and variable amount of other drugs. Complications of pharmacotherapeutic treatment are, therefore, expected to become more prevalent. This gives cause to review drug-related side effects in this new era in cystic fibrosis treatment. RECENT FINDINGS We will discuss cystic fibrosis-related pharmacotherapies with a focus on indication of treatment, side effects and their complications, drug--drug interactions, and options to monitor and prevent drug-induced toxicity. Many recent publications about pharmacotherapy in cystic fibrosis, focus on antifungal therapy and CFTR modulators. We will give an overview of the most important studies. SUMMARY With increased life expectancy which is, in part, because of better treatment options, the burden of pharmacotherapy in cystic fibrosis patients will increase. This has a high impact on quality of life as pharmacotherapy is time consuming and may cause side effects. Therefore, it is very important to be aware of possible pharmacotherapy-related side effects and their complications, drug--drug interactions, and options to monitor and prevent drug-induced toxicity.
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Esposito S, Pennoni G, Mencarini V, Palladino N, Peccini L, Principi N. Antimicrobial Treatment of Staphylococcus aureus in Patients With Cystic Fibrosis. Front Pharmacol 2019; 10:849. [PMID: 31447669 PMCID: PMC6692479 DOI: 10.3389/fphar.2019.00849] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 07/03/2019] [Indexed: 11/13/2022] Open
Abstract
Staphylococcus aureus is a ubiquitous human commensal pathogen. It is commonly isolated in cystic fibrosis (CF) patients and is considered one of the main causes of the recurrent acute pulmonary infections and progressive decline in lung function that characterize this inherited life-threatening multisystem disorder. However, the true role of S. aureus in CF patients is not completely understood. The main aim of this narrative review is to discuss the present knowledge of the role of S. aureus in CF patients. Literature review showed that despite the fact that the availability and use of drugs effective against S. aureus have coincided with a significant improvement in the prognosis of lung disease in CF patients, clearly evidencing the importance of S. aureus therapy, how to use old and new drugs to obtain the maximal effectiveness has not been precisely defined. The most important problem remains that the high frequency with which S. aureus is carried in healthy subjects prevents the differentiation of simple colonization from infection. Moreover, although experts recommend antibiotic administration in CF patients with symptoms and in those with persistent detection of S. aureus, the best antibiotic approach has not been defined. All these problems are complicated by the evidence that the most effective antibiotic against methicillin-resistant S. aureus (MRSA) cannot be used in patients with CF with the same schedules used in patients without CF. Further studies are needed to solve these problems and to assure CF patients the highest level of care.
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Affiliation(s)
- Susanna Esposito
- Pediatric Clinic, Cystic Fibrosis Center of Umbria Region, Department of Surgical and Biomedical Sciences, Università degli Studi di Perugia, Perugia, Italy
| | - Guido Pennoni
- Pediatric Unit, Cystic Fibrosis Center of Umbria Region, Branca Hospital, Branca, Italy
| | - Valeria Mencarini
- Pediatric Unit, Cystic Fibrosis Center of Umbria Region, Branca Hospital, Branca, Italy
| | - Nicola Palladino
- Pediatric Unit, Cystic Fibrosis Center of Umbria Region, Branca Hospital, Branca, Italy
| | - Laura Peccini
- Pediatric Clinic, Cystic Fibrosis Center of Umbria Region, Department of Surgical and Biomedical Sciences, Università degli Studi di Perugia, Perugia, Italy
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Bulitta JB, Jiao Y, Landersdorfer CB, Sutaria DS, Tao X, Shin E, Höhl R, Holzgrabe U, Stephan U, Sörgel F. Comparable Bioavailability and Disposition of Pefloxacin in Patients with Cystic Fibrosis and Healthy Volunteers Assessed via Population Pharmacokinetics. Pharmaceutics 2019; 11:pharmaceutics11070323. [PMID: 31295857 PMCID: PMC6681055 DOI: 10.3390/pharmaceutics11070323] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Revised: 06/30/2019] [Accepted: 07/04/2019] [Indexed: 11/16/2022] Open
Abstract
Quinolone antibiotics present an attractive oral treatment option in patients with cystic fibrosis (CF). Prior studies have reported comparable clearances and volumes of distribution in patients with CF and healthy volunteers for primarily renally cleared quinolones. We aimed to provide the first pharmacokinetic comparison for pefloxacin as a predominantly nonrenally cleared quinolone and its two metabolites between both subject groups. Eight patients with CF (fat-free mass [FFM]: 36.3 ± 6.9 kg, average ± SD) and ten healthy volunteers (FFM: 51.7 ± 9.9 kg) received 400 mg pefloxacin as a 30 min intravenous infusion and orally in a randomized, two-way crossover study. All plasma and urine data were simultaneously modelled. Bioavailability was complete in both subject groups. Pefloxacin excretion into urine was approximately 74% higher in patients with CF compared to that in healthy volunteers, whereas the urinary excretion of metabolites was only slightly higher in patients with CF. After accounting for body size and composition via allometric scaling by FFM, pharmacokinetic parameter estimates in patients with CF divided by those in healthy volunteers were 0.912 for total clearance, 0.861 for nonrenal clearance, 1.53 for renal clearance, and 0.916 for volume of distribution. Nonrenal clearance accounted for approximately 90% of total pefloxacin clearance. Overall, bioavailability and disposition were comparable between both subject groups.
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Affiliation(s)
- Jürgen B Bulitta
- Department of Pharmacotherapy and Translational Research, College of Pharmacy, University of Florida, Orlando, FL 32827, USA.
| | - Yuanyuan Jiao
- Department of Pharmacotherapy and Translational Research, College of Pharmacy, University of Florida, Orlando, FL 32827, USA
| | - Cornelia B Landersdorfer
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville VIC 3052, Australia
| | - Dhruvitkumar S Sutaria
- Department of Pharmacotherapy and Translational Research, College of Pharmacy, University of Florida, Orlando, FL 32827, USA
| | - Xun Tao
- Department of Pharmacotherapy and Translational Research, College of Pharmacy, University of Florida, Orlando, FL 32827, USA
| | - Eunjeong Shin
- Department of Pharmacotherapy and Translational Research, College of Pharmacy, University of Florida, Orlando, FL 32827, USA
| | - Rainer Höhl
- Institute of Clinical Hygiene, Medical Microbiology and Infectiology, Klinikum Nürnberg, Paracelsus Medical University, 90419 Nürnberg, Germany
| | - Ulrike Holzgrabe
- Institute for Pharmacy and Food Chemistry, University of Würzburg, 97074 Würzburg, Germany
| | - Ulrich Stephan
- IBMP-Institute for Biomedical and Pharmaceutical Research, 90562 Nürnberg-Heroldsberg, Germany
- Department of Pharmacology, University of Duisburg, 47057 Essen, Germany
| | - Fritz Sörgel
- IBMP-Institute for Biomedical and Pharmaceutical Research, 90562 Nürnberg-Heroldsberg, Germany.
- Department of Pharmacology, University of Duisburg, 47057 Essen, Germany.
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Shah NR, Bulitta JB, Kinzig M, Landersdorfer CB, Jiao Y, Sutaria DS, Tao X, Höhl R, Holzgrabe U, Kees F, Stephan U, Sörgel F. Novel Population Pharmacokinetic Approach to Explain the Differences between Cystic Fibrosis Patients and Healthy Volunteers via Protein Binding. Pharmaceutics 2019; 11:pharmaceutics11060286. [PMID: 31216743 PMCID: PMC6630667 DOI: 10.3390/pharmaceutics11060286] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Revised: 05/16/2019] [Accepted: 05/17/2019] [Indexed: 11/16/2022] Open
Abstract
The pharmacokinetics in patients with cystic fibrosis (CF) has long been thought to differ considerably from that in healthy volunteers. For highly protein bound β-lactams, profound pharmacokinetic differences were observed between comparatively morbid patients with CF and healthy volunteers. These differences could be explained by body weight and body composition for β-lactams with low protein binding. This study aimed to develop a novel population modeling approach to describe the pharmacokinetic differences between both subject groups by estimating protein binding. Eight patients with CF (lean body mass [LBM]: 39.8 ± 5.4kg) and six healthy volunteers (LBM: 53.1 ± 9.5kg) received 1027.5 mg cefotiam intravenously. Plasma concentrations and amounts in urine were simultaneously modelled. Unscaled total clearance and volume of distribution were 3% smaller in patients with CF compared to those in healthy volunteers. After allometric scaling by LBM to account for body size and composition, the remaining pharmacokinetic differences were explained by estimating the unbound fraction of cefotiam in plasma. The latter was fixed to 50% in male and estimated as 54.5% in female healthy volunteers as well as 56.3% in male and 74.4% in female patients with CF. This novel approach holds promise for characterizing the pharmacokinetics in special patient populations with altered protein binding.
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Affiliation(s)
- Nirav R. Shah
- Department of Pharmacotherapy and Translational Research, College of Pharmacy, University of Florida, Orlando, FL 32827, USA; (N.R.S.); (Y.J.); (D.S.S.); (X.T.)
| | - Jürgen B. Bulitta
- Department of Pharmacotherapy and Translational Research, College of Pharmacy, University of Florida, Orlando, FL 32827, USA; (N.R.S.); (Y.J.); (D.S.S.); (X.T.)
- Correspondence: (J.B.B.); (F.S.); Tel.: +1-407-313-7010 (J.B.B.); +49-911-518-290 (F.S.)
| | - Martina Kinzig
- IBMP—Institute for Biomedical and Pharmaceutical Research, Nürnberg-Heroldsberg 90562, Germany;
| | - Cornelia B. Landersdorfer
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC 3052, Australia;
| | - Yuanyuan Jiao
- Department of Pharmacotherapy and Translational Research, College of Pharmacy, University of Florida, Orlando, FL 32827, USA; (N.R.S.); (Y.J.); (D.S.S.); (X.T.)
| | - Dhruvitkumar S. Sutaria
- Department of Pharmacotherapy and Translational Research, College of Pharmacy, University of Florida, Orlando, FL 32827, USA; (N.R.S.); (Y.J.); (D.S.S.); (X.T.)
| | - Xun Tao
- Department of Pharmacotherapy and Translational Research, College of Pharmacy, University of Florida, Orlando, FL 32827, USA; (N.R.S.); (Y.J.); (D.S.S.); (X.T.)
| | - Rainer Höhl
- Institute of Clinical Hygiene, Medical Microbiology and Infectiology, Klinikum Nürnberg, Paracelsus Medical University, Nürnberg 90419, Germany;
| | - Ulrike Holzgrabe
- Institute for Pharmacy and Food Chemistry, University of Würzburg, Würzburg 97074, Germany;
| | - Frieder Kees
- Department of Pharmacology, University of Regensburg, Regensburg 93053, Germany;
| | - Ulrich Stephan
- IBMP—Institute for Biomedical and Pharmaceutical Research, Nürnberg-Heroldsberg 90562, Germany;
- Department of Pharmacology, University of Duisburg, Essen 47057, Germany
| | - Fritz Sörgel
- IBMP—Institute for Biomedical and Pharmaceutical Research, Nürnberg-Heroldsberg 90562, Germany;
- Department of Pharmacology, University of Duisburg, Essen 47057, Germany
- Correspondence: (J.B.B.); (F.S.); Tel.: +1-407-313-7010 (J.B.B.); +49-911-518-290 (F.S.)
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Smibert O, Satlin MJ, Nellore A, Peleg AY. Carbapenem-Resistant Enterobacteriaceae in Solid Organ Transplantation: Management Principles. Curr Infect Dis Rep 2019; 21:26. [PMID: 31183574 DOI: 10.1007/s11908-019-0679-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
PURPOSE OF REVIEW Carbapenem-resistant Enterobacteriaceae (CRE) have emerged as a worldwide problem. Given their degree of immunosuppression and the level of contact with the healthcare system, solid organ transplant (SOT) recipients are at a disproportionately higher risk of acquisition, colonization, and infection with CRE, and outcomes from infection tend to be worse compared to non-transplant patients. Therapeutic options are limited for CRE infections although several newer agents have recently been approved for use. How well these agents perform in the setting of immunosuppression and SOT is unclear. We sought to review the epidemiology of CRE in SOT and the management principles. RECENT FINDINGS CRE infections are becoming an increasing problem in SOT, and donor-derived infections present a challenge in the peri-transplant period. Newer treatments for CRE are emerging that are less toxic and potentially more effective than prior CRE-active agents, but supportive clinical data are limited. Newer beta-lactamase inhibitors have good activity against KPC carbapenemases, but they lack activity against metallo-beta-lactamases (e.g., NDM). Promising data is emerging with newer agents that have activity against most carbapenemases, but, again, clinical data is needed. Combination therapy in addition to optimal pharmacokinetic and pharmacodynamics may go some way to improve outcomes against these difficult-to-treat organisms. Other novel therapies that prevent the emergence of resistance (oral beta-lactamase inhibitors) and eradication of resistant Gram-negative colonization (fecal microbiota transplant) may eventually become part of a bundle approach to reduce CRE infections in the future. As in non-transplant patients, CRE infections in the transplant setting are challenging to treat and prevent. Infection prevention and control remains crucial to prevent widespread dissemination, and unique challenges exist with donor-derived CRE and how best to manage recipients in the peri-transplant period. Newer treatments are now in early-phase clinical studies, and in vitro activity data are supportive for several agents providing hope for improved outcomes with these typically difficult-to-treat and highly morbid infections in transplant recipients.
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Affiliation(s)
- Olivia Smibert
- Department of Infectious Diseases, The Alfred Hospital and Central Clinical School, Monash University, Melbourne, VIC, Australia.,Transplant Infectious Disease and Compromised Host Program, Massachusetts General Hospital, Boston, MA, USA
| | - Michael J Satlin
- Division of Infectious Diseases, Weill Cornell Medicine, 1300 York Avenue, New York, NY, USA
| | - Anoma Nellore
- Division of Infectious Diseases, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Anton Y Peleg
- Department of Infectious Diseases, The Alfred Hospital and Central Clinical School, Monash University, Melbourne, VIC, Australia. .,Infection and Immunity Program, Monash Biomedicine Discovery Institute, Department of Microbiology, Monash University, Clayton, VIC, Australia.
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Jeong W, Snell GI, Levvey BJ, Westall GP, Morrissey CO, Wolfe R, Ivulich S, Neoh CF, Slavin MA, Kong DCM. Single-centre study of therapeutic drug monitoring of posaconazole in lung transplant recipients: factors affecting trough plasma concentrations. J Antimicrob Chemother 2019; 73:748-756. [PMID: 29211913 DOI: 10.1093/jac/dkx440] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Accepted: 10/31/2017] [Indexed: 11/12/2022] Open
Abstract
Objectives This study describes therapeutic drug monitoring (TDM) of posaconazole suspension and modified release (MR) tablets in lung transplant (LTx) recipients and evaluates factors that may affect posaconazole trough plasma concentration (Cmin). Methods A single-centre, retrospective study evaluating posaconazole Cmin in LTx recipients receiving posaconazole suspension or MR tablets between January 2014 and December 2016. Results Forty-seven LTx patients received posaconazole suspension, and 78 received the MR tablet formulation; a total of 421 and 617 Cmin measurements were made, respectively. Posaconazole was concurrently administered with proton pump inhibitor in ≥ 90% of patients. The median (IQR) of initial posaconazole Cmin following 300 mg daily of posaconazole tablet was significantly higher than that of 800 mg daily of posaconazole suspension [1.65 (0.97-2.13) mg/L versus 0.81 (0.48-1.15) mg/L, P < 0.01]. Variability in posaconazole Cmin was apparent regardless of the formulations prescribed and dose adjustments were routinely undertaken to maintain therapeutic Cmin. A clear dose-response relationship was observed in patients receiving posaconazole MR tablets. Non-specific adverse events (fatigue, tremor, lethargy, sweating, nausea/vomiting and weight loss) were reported in 3/78 (4%) patients receiving posaconazole MR tablets. Posaconazole Cmin in these three patients was determined to be 9.6, 6.2 and 2.3 mg/L. Conclusions The current study has provided clinically important insights into the TDM of posaconazole in LTx recipients. Routine TDM should be undertaken in LTx recipients receiving posaconazole suspension and/or MR tablets.
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Affiliation(s)
- Wirawan Jeong
- Centre for Medicine Use and Safety, Monash University, Victoria, Australia
| | - Gregory I Snell
- Lung Transplant Service, Alfred Health & Monash University, Victoria, Australia
| | - Bronwyn J Levvey
- Lung Transplant Service, Alfred Health & Monash University, Victoria, Australia
| | - Glen P Westall
- Lung Transplant Service, Alfred Health & Monash University, Victoria, Australia
| | - C Orla Morrissey
- Department of Infectious Diseases, Alfred Health & Monash University, Victoria, Australia
| | - Rory Wolfe
- Department of Epidemiology and Preventive Medicine, Monash University, Victoria, Australia
| | | | - Chin Fen Neoh
- Collaborative Drug Discovery Research (CDDR) Group, Faculty of Pharmacy, Universiti Teknologi MARA, Selangor, Malaysia
| | - Monica A Slavin
- National Centre for Infections in Cancer, Peter MacCallum Cancer Centre, Victoria, Australia.,Victorian Infectious Diseases Service, Royal Melbourne Hospital, Victoria, Australia
| | - David C M Kong
- Centre for Medicine Use and Safety, Monash University, Victoria, Australia.,Pharmacy Department, Ballarat Health Services, Victoria, Australia.,The National Centre for Antimicrobial Stewardship, The Peter Doherty Institute for Infection and Immunity, Victoria, Australia
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Darley DR, Carlos L, Hennig S, Liu Z, Day R, Glanville AR. Tacrolimus exposure early after lung transplantation and exploratory associations with acute cellular rejection. Eur J Clin Pharmacol 2019; 75:879-888. [PMID: 30859243 DOI: 10.1007/s00228-019-02658-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Accepted: 02/27/2019] [Indexed: 12/18/2022]
Abstract
AIMS To (i) describe tacrolimus (TAC) pre-dose concentrations (C0), (ii) calculate apparent oral TAC clearance (CL/FHCT) adjusted for measured haematocrit (HCTi) and standardised to a HCT of 45%, across three observation time points and (iii) explore if low TAC C0 or high mean CL/FHCT are associated with an increased risk of rejection episodes early after lung transplantation. METHODS TAC whole blood concentration-time profiles and transbronchial biopsies were performed prospectively at weeks 3, 6 and 12 after lung transplantation. The TAC pre-dose concentration (C0) was measured, and CL/FHCT was determined using non-compartmental analysis. The associations between TAC C0 and CL/FHCT and rejection status were explored using repeated measures logistic regression. RESULTS Eighteen patients provided 377 TAC whole blood concentrations. Considerable variability around the median (IQR) CL/FHCT 6.8 (4.2-15.9) L h-1, and the median C0 12.7 (9.9-16.6) μg L-1 was noted. Despite adjustment for haematocrit, a significant decrease was observed in CL/FHCT in all patients over time: CL/FHCT 14 (5.4-23) at week 3, CL/FHCT 7.7 (4.5-12) at week 6 and CL/FHCT 3.9 (2.4-11) L h-1 at week 12 (p < 0.01). Seven (38.9%) patients experienced a single grade 2 rejection, whilst 11 (61.1%) patients experienced no rejection. Higher TAC C0 were associated with a reduced risk of rejection OR 0.68 (95% CI 0.51-0.91, p = 0.02), and greater mean CL/FHCT was associated with an increased risk of rejection OR 1.34 (95% CI 1.01-1.81 p = 0.04). CONCLUSION Monitoring TAC C0, HCT and CL/FHCT in patients after lung transplantation may assist clinicians in detecting patients at risk of acute rejection and may guide future research into TAC and HCT monitoring after lung transplantation.
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Affiliation(s)
- David R Darley
- Lung Transplant Unit, St Vincent's Hospital Darlinghurst, Sydney, Australia. .,UNSW Medicine, St Vincent's Hospital Clinical School, Sydney, Australia.
| | - Lilibeth Carlos
- Department of Pharmacy, St Vincent's Hospital Darlinghurst, Sydney, Australia
| | - Stefanie Hennig
- School of Pharmacy, University of Queensland, Brisbane, Australia
| | - Zhixin Liu
- Department of Statistics, University of New South Wales, Kensington, Australia
| | - Richard Day
- UNSW Medicine, St Vincent's Hospital Clinical School, Sydney, Australia.,Department of Clinical Pharmacology, St Vincent's Hospital Darlinghurst, Sydney, Australia
| | - Allan R Glanville
- Lung Transplant Unit, St Vincent's Hospital Darlinghurst, Sydney, Australia
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Pharmacokinetic Monitoring of Vancomycin in Cystic Fibrosis: Is It Time to Move Past Trough Concentrations? Pediatr Infect Dis J 2019; 38:258-262. [PMID: 29742643 DOI: 10.1097/inf.0000000000002088] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND A correlation between vancomycin (VAN) trough concentrations (VTC) and area under the curve (AUC) to minimum inhibitory concentration (MIC) ratio (AUC/MIC) has not been established in children/adolescents with cystic fibrosis (CF). The primary objective of this study was to determine the correlation between measured VTCs and AUC/MIC using population-based pharmacokinetics. METHODS A retrospective cohort study of children/adolescents diagnosed with CF, 6 to <18 years of age, treated with VAN for methicillin-resistant Staphylococcus aureus infection was conducted. The relationship between final VTCs and calculated AUC/MIC was assessed using Pearson and Spearman correlations. All tests were 2-tailed with alpha set at 0.05. RESULTS Thirty children/adolescents, 7 to 17 years of age (median age 15 year; interquartile range: 9-17 years), were included. The mean final VAN dose was 58.03 ± 18.58 mg/kg/d, and the median final VTC was 12.6 (11-13.6) mg/L. The mean AUC/MIC was 355.34 ± 138.46 (Le model) versus 426.79 ± 178.92 (Stockmann model; P = 0.089). No correlation existed between VTCs and AUC/MIC using either the model by Le (r = 0.140; P = 0.461) or Stockmann (r = 0.115; P = 0.564). Using the Stockmann model, VAN dose (mg/kg/dose) was found to have a strong positive correlation with AUC (r = 0.8874; P < 0.0001) and AUC/MIC (r = 0.7877; P < 0.0001). CONCLUSIONS VTCs did not correlate with AUC or AUC/MIC. Further research is needed to determine which estimate of VAN treatment efficacy is most appropriate for children and adolescents with CF infected with methicillin-resistant Staphylococcus aureus.
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Abstract
Nontuberculous mycobacteria (NTM) are important emerging cystic fibrosis (CF) pathogens, with estimates of prevalence ranging from 6% to 13%. Diagnosis of NTM disease in patients with CF is challenging, as the infection may remain indolent in some, without evidence of clinical consequence, whereas other patients suffer significant morbidity and mortality. Treatment requires prolonged periods of multiple drugs and varies depending on NTM species, resistance pattern, and extent of disease. The development of a disease-specific approach to the diagnosis and treatment of NTM infection in CF patients is a research priority, as a lifelong strategy is needed for this high-risk population.
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Affiliation(s)
- Stacey L Martiniano
- Department of Pediatrics, Children's Hospital Colorado, University of Colorado Denver School of Medicine, 13123 East 16th Avenue, Box B-395, Aurora, CO 80045, USA
| | - Jerry A Nick
- Department of Medicine, National Jewish Health, 1400 Jackson Street, Denver, CO 80206, USA; Department of Medicine, University of Colorado Anschutz Medical Campus, 13001 E. 17th Place, Aurora, CO 80045, USA
| | - Charles L Daley
- Department of Medicine, National Jewish Health, 1400 Jackson Street, Denver, CO 80206, USA; Department of Medicine, University of Colorado Anschutz Medical Campus, 13001 E. 17th Place, Aurora, CO 80045, USA.
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Crass RL, Pai MP, Lodise TP. Individualizing piperacillin/tazobactam dosing in adult patients with cystic fibrosis: can tobramycin measurements help? J Antimicrob Chemother 2019; 74:126-129. [PMID: 30252050 DOI: 10.1093/jac/dky388] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Accepted: 08/27/2018] [Indexed: 11/14/2022] Open
Abstract
Background Empirical models to predict β-lactam pharmacokinetics (PK) using information from routine aminoglycoside therapeutic drug monitoring (TDM) have been proposed for critically ill patients; however, no such models exist for patients with cystic fibrosis (CF). Objectives To investigate whether PK parameters of tobramycin could be used to predict those of piperacillin. Methods A non-interventional, open-label PK study was conducted in hospitalized adults treated with piperacillin/tazobactam and tobramycin for acute pulmonary exacerbations of CF. Six serum samples per patient were collected and analysed. One- and two-compartment population PK models with linear, Michaelis-Menten or mixed elimination were evaluated for both drugs within the PmetricsTM package for R. Models were developed and compared iteratively using the log-likelihood and Akaike information criterion (AIC) objective functions. Results Nine primarily female (n = 8) and Caucasian (100%) adult CF patients were enrolled. The median (IQR) age, height, weight and serum creatinine of included patients was 31 (27-32) years, 51.4 (49.9-55.8) kg, 162.6 (160.0-165.1) cm and 0.6 (0.5-0.6) mg/dL, respectively. The final model with the lowest objective function values consisted of one compartment with first-order elimination for tobramycin and two compartments with mixed-order elimination for piperacillin with the elimination rate constant of piperacillin modelled as a linear function of the elimination rate constant of tobramycin. Conclusions A relationship was identified between the elimination rate constants of tobramycin and piperacillin. Validation of this relationship in larger studies of adult patients with CF is needed before application to the precision dosing of piperacillin/tazobactam in this patient population.
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Affiliation(s)
- Ryan L Crass
- Department of Clinical Pharmacy, University of Michigan College of Pharmacy, Ann Arbor, MI, USA
| | - Manjunath P Pai
- Department of Clinical Pharmacy, University of Michigan College of Pharmacy, Ann Arbor, MI, USA
| | - Thomas P Lodise
- Department of Pharmacy Practice, Albany College of Pharmacy and Health Sciences, Albany, NY, USA
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King CS, Brown AW, Aryal S, Ahmad K, Donaldson S. Critical Care of the Adult Patient With Cystic Fibrosis. Chest 2019; 155:202-214. [DOI: 10.1016/j.chest.2018.07.025] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 07/19/2018] [Accepted: 07/20/2018] [Indexed: 01/24/2023] Open
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Liou TG. The Clinical Biology of Cystic Fibrosis Transmembrane Regulator Protein: Its Role and Function in Extrapulmonary Disease. Chest 2018; 155:605-616. [PMID: 30359614 DOI: 10.1016/j.chest.2018.10.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 10/08/2018] [Accepted: 10/10/2018] [Indexed: 02/07/2023] Open
Abstract
Normal cystic fibrosis (CF) transmembrane regulator (CFTR) protein has multiple functions in health and disease. Many mutations in the CFTR gene produce abnormal or absent protein. CFTR protein dysfunction underlies the classic CF phenotype of progressive pulmonary and GI pathology but may underlie diseases not usually associated with CF. This review highlights selected extrapulmonary disease that may be associated with abnormal CFTR. Increasing survival in CF is associated with increasing incidence of diseases associated with aging. CFTR dysfunction in older individuals may have novel effects on glucose metabolism, control of insulin release, regulation of circadian rhythm, and cancer cell pathophysiology. In individuals who have cancers with acquired CFTR suppression, their tumors may more likely exhibit rapid expansion, epithelial-to-mesenchymal transformation, abnormally reduced apoptosis, and increased metastatic potential. The new modulators of CFTR protein synthesis could facilitate the additional exploration needed to better understand the unfolding clinical biology of CFTR in human disease, even as they revolutionize treatment of patients with CF.
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Affiliation(s)
- Theodore G Liou
- Center for Quantitative Biology, The Adult Cystic Fibrosis Center and the Division of Respiratory, Critical Care and Occupational Pulmonary Medicine, Department of Internal Medicine, School of Medicine, University of Utah, Salt Lake City, UT.
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Jiao Y, Kim TH, Tao X, Kinzig M, Landersdorfer CB, Drescher SK, Sutaria DS, Moya B, Holzgrabe U, Sörgel F, Bulitta JB. First population pharmacokinetic analysis showing increased quinolone metabolite formation and clearance in patients with cystic fibrosis compared to healthy volunteers. Eur J Pharm Sci 2018; 123:416-428. [DOI: 10.1016/j.ejps.2018.07.054] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2018] [Revised: 07/09/2018] [Accepted: 07/27/2018] [Indexed: 01/29/2023]
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Population Pharmacokinetics of Amikacin in Adult Patients with Cystic Fibrosis. Antimicrob Agents Chemother 2018; 62:AAC.00877-18. [PMID: 30061295 DOI: 10.1128/aac.00877-18] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Accepted: 07/25/2018] [Indexed: 12/27/2022] Open
Abstract
Practitioners commonly use amikacin in patients with cystic fibrosis. Establishment of the pharmacokinetics of amikacin in adults with cystic fibrosis may increase the efficacy and safety of therapy. This study was aimed to establish the population pharmacokinetics of amikacin in adults with cystic fibrosis. We used serum concentration data obtained during routine therapeutic drug monitoring and explored the influence of patient covariates on drug disposition. We performed a retrospective chart review to collect the amikacin dosing regimens, serum amikacin concentrations, blood sampling times, and patient characteristics for adults with cystic fibrosis admitted for treatment of acute pulmonary exacerbations. Amikacin concentrations were retrospectively collected for 49 adults with cystic fibrosis, and 192 serum concentrations were available for analysis. A population pharmacokinetic model was developed using nonlinear mixed-effects modeling with the first-order conditional estimation method. A two-compartment model with first-order elimination best described amikacin pharmacokinetics. Creatinine clearance and weight were identified as significant covariates for clearance and the volume of distribution, respectively, in the final model. Residual variability was modeled using a proportional error model. Typical estimates for clearance, central and peripheral volumes of distribution, and intercompartmental clearance were 3.06 liters/h, 14.4 liters, 17.1 liters, and 0.925 liters/h, respectively. The pharmacokinetics of amikacin in individuals with cystic fibrosis seems to differ from those in individuals without cystic fibrosis. However, further investigations are needed to confirm these results and, thus, the need for variations in amikacin dosing. Future pharmacodynamic studies will potentially establish the optimal amikacin dosing regimens for the treatment of acute pulmonary exacerbations in adult patients with CF.
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Tukacs M. Pharmacokinetics and Extracorporeal Membrane Oxygenation in Adults: A Literature Review. AACN Adv Crit Care 2018; 29:246-258. [DOI: 10.4037/aacnacc2018439] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
Extracorporeal membrane oxygenation is a rapidly emerging treatment for respiratory or cardiac failure and is used as a bridge to recovery, transplant, or destination therapy. Adult patients receiving extracorporeal membrane oxygenation also receive significant amounts of pharmacotherapy. Although the body of literature on extra-corporeal membrane oxygenation in general is extensive, only a few publications focus on pharmacokinetic changes related to extracorporeal membrane oxygenation in adults. Understanding pharmacokinetics in adult patients receiving extracorporeal membrane oxygenation is important to correctly select and dose medications in this patient population. This article reviews published studies of the effects of extracorporeal membrane oxygenation on pharmacokinetics in adults.
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Affiliation(s)
- Monika Tukacs
- Monika Tukacs is Clinical Nurse III, Cardiothoracic Intensive Care Unit, Columbia University Irving Medical Center and New York-Presbyterian Hospital; and Academic Research Fellow at the Columbia University School of Nursing, 177 Fort Washington Ave, New York, NY 10032
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Pharmacokinetics of Tedizolid in Plasma and Sputum of Adults with Cystic Fibrosis. Antimicrob Agents Chemother 2018; 62:AAC.00550-18. [PMID: 29914949 DOI: 10.1128/aac.00550-18] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 06/08/2018] [Indexed: 01/03/2023] Open
Abstract
Over the past decade, the prevalence of infections involving methicillin-resistant Staphylococcus aureus (MRSA) in patients with cystic fibrosis (CF) has increased significantly. Tedizolid (TZD) demonstrates excellent activity against MRSA and a favorable safety profile. The pharmacokinetics of several antibiotics have been shown to be altered in CF patients. The purpose of this study was to characterize the pharmacokinetics of tedizolid in this population. Eleven patients with CF were randomized to receive tedizolid phosphate at 200 mg orally or intravenously once daily for 3 doses with a minimum 2-day washout, followed by crossover to the remaining dosage form. Plasma and expectorated sputum were collected following the third dose of each dosage form for analysis. Population pharmacokinetic analysis was performed using the maximum likelihood expectation maximization method, and the disposition of TZD was described by a two-compartment model. The sputum concentrations exceeded the unbound plasma concentrations with an estimated mean sputum-to-unbound plasma penetration ratio of 2.88 (coefficient of variation, 50.3%). The estimated population mean ± standard deviation of total clearance, central volume of distribution, and bioavailability were 9.72 ± 1.62 liters/h, 61.6 ± 6.94 liters, and 1.04 ± 0.232, respectively. The total clearance was higher in CF patients than in healthy volunteers; however, it was similar to published data for patients with complicated skin and skin structure infections (cSSSIs). This study demonstrates that the oral bioavailability of tedizolid is excellent in patients with CF and that the plasma pharmacokinetics are similar to those reported for patients with cSSSIs.
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Hong LT, Liou TG, Deka R, King JB, Stevens V, Young DC. Pharmacokinetics of Continuous Infusion Beta-lactams in the Treatment of Acute Pulmonary Exacerbations in Adult Patients With Cystic Fibrosis. Chest 2018; 154:1108-1114. [PMID: 29908155 DOI: 10.1016/j.chest.2018.06.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 06/01/2018] [Accepted: 06/04/2018] [Indexed: 10/14/2022] Open
Abstract
BACKGROUND Several clinical trials have shown the efficacy of continuous infusion beta-lactam (BL) antibiotics in patients with cystic fibrosis (CF); however, little is known about pharmacokinetic changes during the treatment of an acute pulmonary exacerbation (APE). Identifying and understanding these changes may assist in optimizing antibiotic dosing during APE treatment. METHODS This study was a retrospective cohort study of 162 adult patients with CF admitted to the University of Utah Hospital between January 1, 2008, and May 15, 2014, for treatment of an APE with both a continuous infusion BL and IV tobramycin. We extracted the administered doses of continuous infusion BLs and tobramycin along with serum drug concentrations and calculated medication clearance rates. The primary outcome was change in clearance rates of continuous infusion BLs between day 2 and day 7 of APE treatment. RESULTS The BL clearance rate increased 20.7% (95% CI, 11.42 to 32.49; P < .001), whereas the tobramycin clearance rate decreased 6.3% (95% CI, -12.29 to -4.45; P < .001). The mean percent predicted FEV1 increased between admission and discharge by 12.2% (95% CI, -13.81 to -10.55; P < .001). CONCLUSIONS Clinicians should monitor BL levels along with aminoglycoside levels and make dose adjustments to maximize the chance of optimal antibiotic treatment. Continuous infusion BL and tobramycin clearance can change dramatically during the treatment of an APE, which may necessitate significant changes in dosing to achieve optimal antibiotic levels. Clearance rates of these antibiotics may change in opposite directions, requiring specific monitoring of each medication.
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Affiliation(s)
- Lisa T Hong
- Loma Linda University School of Pharmacy, Loma Linda, CA.
| | | | - Rishi Deka
- Department of Radiation Medicine and Applied Sciences, University of California San Diego, San Diego, CA
| | | | | | - David C Young
- University of Utah College of Pharmacy, Salt Lake City, UT; University of Utah Health Care, Salt Lake City, UT
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Sedation with Propofol for Bronchoscopy in Cystic Fibrosis Lung Transplant Recipients. Lung 2018; 196:435-439. [PMID: 29797070 DOI: 10.1007/s00408-018-0119-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 04/30/2018] [Indexed: 01/02/2023]
Abstract
INTRODUCTION Flexible fiberoptic bronchoscopy (FFB) plays an important role in the surveillance of cystic fibrosis (CF) patients after lung transplantation (LTx). With rapid onset and clearance, propofol provides a safe and efficient method for sedation during FFB, yet sedation requirements for CF patients are not well described. OBJECTIVES Due to pharmacokinetic differences for other classes of drugs in CF patients, this study was performed to examine propofol requirements for sedation during bronchoscopy in lung transplant recipients with CF. METHODS A single-center retrospective cohort study was performed to examine propofol sedation requirements during outpatient surveillance. FFB procedures with transbronchial biopsy (TBB) in post-LTx recipients between 2009 and 2014 were conducted. RESULTS A total of 40 FFB procedures with TBB were performed 20 CF (11 females), 20 non-CF (11 females). Mean (± SD) age was 25.6 ± 9.2 (range 13-42) years and 22.2 ± 10.8 (range 11-39) years for the CF and non-CF groups, respectively. Propofol requirements were significantly higher in the CF patients compared to the non-CF patients. Mean (± SD) propofol dose for CF patients was 334 ± 86 versus 214 ± 88 mg for non-CF patients (p < 0.001). Mean (± SD) propofol dose per weight (mg/kg) was 6.5 ± 2.1 for CF patients versus 3.8 ± 1.6 for non-CF patients (p < 0.001). CONCLUSIONS Compared to a non-CF cohort, CF lung transplant recipients required higher dosages of propofol for sedation during FFB with TBB.
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