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Gotta V, Bielicki JA, Paioni P, Csajka C, Bräm DS, Berger C, Giger E, Buettcher M, Posfay-Barbe KM, Van den Anker J, Pfister M. Pharmacometric in silico studies used to facilitate a national dose standardisation process in neonatology - application to amikacin. Swiss Med Wkly 2024; 154:3632. [PMID: 38635904 DOI: 10.57187/s.3632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/20/2024] Open
Abstract
BACKGROUND AND AIMS Pharmacometric in silico approaches are frequently applied to guide decisions concerning dosage regimes during the development of new medicines. We aimed to demonstrate how such pharmacometric modelling and simulation can provide a scientific rationale for optimising drug doses in the context of the Swiss national dose standardisation project in paediatrics using amikacin as a case study. METHODS Amikacin neonatal dosage is stratified by post-menstrual age (PMA) and post-natal age (PNA) in Switzerland and many other countries. Clinical concerns have been raised for the subpopulation of neonates with a post-menstrual age of 30-35 weeks and a post-natal age of 0-14 days ("subpopulation of clinical concern"), as potentially oto-/nephrotoxic trough concentrations (Ctrough >5 mg/l) were observed with a once-daily dose of 15 mg/kg. We applied a two-compartmental population pharmacokinetic model (amikacin clearance depending on birth weight and post-natal age) to real-world demographic data from 1563 neonates receiving anti-infectives (median birth weight 2.3 kg, median post-natal age six days) and performed pharmacometric dose-exposure simulations to identify extended dosing intervals that would ensure non-toxic Ctrough (Ctrough <5 mg/l) dosages in most neonates. RESULTS In the subpopulation of clinical concern, Ctrough <5 mg/l was predicted in 59% versus 79-99% of cases in all other subpopulations following the current recommendations. Elevated Ctrough values were associated with a post-natal age of less than seven days. Simulations showed that extending the dosing interval to ≥36 h in the subpopulation of clinical concern increased the frequency of a desirable Ctrough below 5 mg/l to >80%. CONCLUSION Pharmacometric in silico studies using high-quality real-world demographic data can provide a scientific rationale for national paediatric dose optimisation. This may increase clinical acceptance of fine-tuned standardised dosing recommendations and support their implementation, including in vulnerable subpopulations.
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Affiliation(s)
- Verena Gotta
- SwissPedDose/SwissPedNet collaboration expert team, Zürich/Basel/Lausanne, Switzerland
- Pediatric Pharmacology and Pharmacometrics, University of Basel Children's Hospital, Basel, Switzerland
- Pediatric Clinical Pharmacy, University of Basel Children's Hospital, Basel Switzerland
| | - Julia Anna Bielicki
- Paediatric Research Centre and Paediatric Infectious Diseases and Vaccinology Division, University of Basel Children's Hospital, Basel, Switzerland
- Centre for Neonatal and Paediatric Infection, St George's University, London, United Kingdom
| | - Paolo Paioni
- SwissPedDose/SwissPedNet collaboration expert team, Zürich/Basel/Lausanne, Switzerland
- Division of Infectious Diseaeses, University Children's Hospital Zurich, Zurich, Switzerland
| | - Chantal Csajka
- SwissPedDose/SwissPedNet collaboration expert team, Zürich/Basel/Lausanne, Switzerland
- Centre for Research and Innovation, University Hospital and University of Lausanne, Lausanne, Switzerland
- School of Pharmaceutical Sciences, University of Geneva and University of Lausanne, Geneva/Lausanne, Switzerland
| | - Dominic Stefan Bräm
- Pediatric Pharmacology and Pharmacometrics, University of Basel Children's Hospital, Basel, Switzerland
| | - Christoph Berger
- Division of Infectious Diseaeses, University Children's Hospital Zurich, Zurich, Switzerland
- SwissPedDose, Zurich, Switzerland
| | | | - Michael Buettcher
- SwissPedDose/SwissPedNet collaboration expert team, Zürich/Basel/Lausanne, Switzerland
- Pediatric Pharmacology and Pharmacometrics, University of Basel Children's Hospital, Basel, Switzerland
- Paediatric Infectious Diseases, Lucerne Children's Hospital, Cantonal Hospital Lucerne, and Faculty of Health Sciences and Medicine, University Lucerne, Lucerne, Switzerland
| | - Klara M Posfay-Barbe
- General Pediatrics and Pediatric Infectious Diseases Unit, Department of Woman, Child and Adolescent, University Hospitals of Geneva and Medical School of Geneva, Geneva, Switzerland
| | - John Van den Anker
- Pediatric Pharmacology and Pharmacometrics, University of Basel Children's Hospital, Basel, Switzerland
| | - Marc Pfister
- Pediatric Pharmacology and Pharmacometrics, University of Basel Children's Hospital, Basel, Switzerland
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Review on Population Pharmacokinetics of Amikacin in Paediatrics. JOURNAL OF PURE AND APPLIED MICROBIOLOGY 2022. [DOI: 10.22207/jpam.16.4.20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
Amikacin is an aminoglycoside antibiotic with a broad-spectrum bacterial coverage that is frequently utilized both as monotherapy and in combination with other antibiotics for severe bacterial infections in the paediatric population. The narrow therapeutic index of the drug and high inter-individual variabilities in drug exposure results in either drug toxicity or subtherapeutic concentrations. Thus, therapeutic drug monitoring and population pharmacokinetics are pivotal to facilitate the optimal dosage regimens in paediatrics and negate the adverse outcomes. The therapeutic goal is to maintain the target peak and trough concentrations within 30-40mg/l and <5 mg/l respectively. This review aimed to summarize population pharmacokinetic considerations and the pharmacokinetic parameters of amikacin across the paediatric population.
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Antioxidative and Anti-Inflammatory Protective Effects of β-Caryophyllene against Amikacin-Induced Nephrotoxicity in Rat by Regulating the Nrf2/AMPK/AKT and NF- κB/TGF- β/KIM-1 Molecular Pathways. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:4212331. [PMID: 36062191 PMCID: PMC9439917 DOI: 10.1155/2022/4212331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Accepted: 08/04/2022] [Indexed: 12/14/2022]
Abstract
Herein, the molecular pathogenic pathways implicated in renal injury triggered by amikacin (AK), together with the alleviating actions of β-caryophyllene (BCP), were investigated. Adult male Wistar rats (n = 32) were disseminated to the four following groups (n = 8/group): normal group, positive control animals (PC) that received AK intraperitoneal injections for 14 days (500 mg/kg/day), and rats that received AK simultaneously with small (200 mg/kg/day) and high doses (400 mg/kg/day) of BCP. The PC renal tissues revealed abnormal histology alongside increased apoptosis and significantly elevated serum creatinine and urea with marked proteinuria and oliguria relative to the normal rats. Moreover, renal tissues from the PC animals also showed substantial upregulations in NF-κB/TGF-β/KIM-1, whilst Nrf2/AMPK/AKT/PCNA declined, at the gene and protein levels in comparison to the normal rats. Additionally, the levels of markers of oxidative stress (MDA/H2O2/protein adducts) and inflammation (TNF-α/IL-1β/IL-6/IL-18/TLR/HSP25) were substantially higher in the PC renal specimens, whereas the antioxidants (GSH/GPx/SOD1/CAT) and interleukin-10 decreased, relative to the NC group. Both BCP protocols improved the biochemical markers of renal functions, alleviated renal histopathology and apoptosis, and decreased NF-κB/TGF-β/KIM-1 alongside the concentrations of oxidative stress and proinflammatory markers, whilst promoting Nrf2/AMPK/AKT/IL-10/PCNA and the targeted antioxidants. However, the improving effects in the high-dose regimen were markedly stronger than those observed in animals treated with low dose of BCP. In conclusion, the present report is the first to connect NF-κB/TGF-β/KIM-1 proinflammatory and Nrf2/AMPK/AKT antioxidative stress pathways with the pathogenesis of AK-induced nephrotoxicity. Additionally, the current report is the first to disclose alleviating activities for BCP against AK-triggered nephrotoxicity by modulating multiple antioxidative stress with anti-inflammatory molecular pathways.
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Optimal Sample Size for Use in Neonatal Pharmacokinetic Studies. Ther Innov Regul Sci 2022; 56:517-522. [DOI: 10.1007/s43441-021-00368-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Accepted: 12/20/2021] [Indexed: 10/19/2022]
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Population pharmacokinetics of diethylcarbamazine in patients with lymphatic filariasis and healthy individuals. Antimicrob Agents Chemother 2021; 65:e0031721. [PMID: 34310218 DOI: 10.1128/aac.00317-21] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Diethylcarbamazine (DEC) is a drug of choice to treat lymphatic filariasis (LF) either used alone or in combination as mass drug administration (MDA) preventive strategies. The objective of this study was to develop a population pharmacokinetic model for DEC in subjects infected with lymphatic filariasis (LF) compared to healthy individuals, and to evaluate the effect of covariates on the volume of distribution (V/F) and oral clearance (CL/F) of DEC. This was an open-label cohort study of treatment naïve Wuchereria bancrofti-infected (n=32) and uninfected (n=24) adults residing in the Agboville district of Côte d'Ivoire. The population pharmacokinetic model for DEC was built using Phoenix NLME 8.0 software. The covariates included in the model building process were age, gender, bodyweight, infection status, creatinine clearance (CrCl), aspartate aminotransferase (AST) and alanine aminotransferase (ALT) levels. A total of 56 adults were enrolled in the study and a total of 728 samples were obtained over 168 hours. A one-compartment linear pharmacokinetic model with first-order absorption with an absorption lag-time (Tlag) best described the data. After determining the pharmacokinetics (PK) parameters of DEC, body weight and gender were found to be the significant covariates for DEC V/F. The final population pharmacokinetic model adequately described the pharmacokinetics of DEC in the studied population. Model-based simulation indicated that the body weight significantly impacted the exposure in both the male and female population. This analysis may further support the drug-drug interaction model development of DEC with different co-administered drugs/agents in disease control programs.
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Pérez-Blanco JS, Sáez Fernández EM, Calvo MV, Lanao JM, Martín-Suárez A. Amikacin initial dosage in patients with hypoalbuminaemia: an interactive tool based on a population pharmacokinetic approach. J Antimicrob Chemother 2021; 75:2222-2231. [PMID: 32363405 DOI: 10.1093/jac/dkaa158] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 03/25/2020] [Accepted: 03/29/2020] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVES To characterize amikacin population pharmacokinetics in patients with hypoalbuminaemia and to develop a model-based interactive application for amikacin initial dosage. METHODS A population pharmacokinetic model was developed using a non-linear mixed-effects modelling approach (NONMEM) with amikacin concentration-time data collected from clinical practice (75% hypoalbuminaemic patients). Goodness-of-fit plots, minimum objective function value, prediction-corrected visual predictive check, bootstrapping, precision and bias of parameter estimates were used for model evaluation. An interactive model-based simulation tool was developed in R (Shiny and R Markdown). Cmax/MIC ratio, time above MIC and AUC/MIC were used for optimizing amikacin initial dose recommendation. Probabilities of reaching targets were calculated for the dosage proposed. RESULTS A one-compartment model with first-order linear elimination best described the 873 amikacin plasma concentrations available from 294 subjects (model development and external validation groups). Estimated amikacin population pharmacokinetic parameters were CL (L/h) = 0.525 + 4.78 × (CKD-EPI/98) × (0.77 × vancomycin) and V (L) = 26.3 × (albumin/2.9)-0.51 × [1 + 0.006 × (weight - 70)], where CKD-EPI is calculated with the Chronic Kidney Disease Epidemiology Collaboration equation. AMKdose is a useful interactive model-based application for a priori optimization of amikacin dosage, using individual patient and microbiological information together with predefined pharmacokinetic/pharmacodynamic (PKPD) targets. CONCLUSIONS Serum albumin, total bodyweight, estimated glomerular filtration rate (using the CKD-EPI equation) and co-medication with vancomycin showed a significant impact on amikacin pharmacokinetics. A powerful interactive initial dose-finding tool has been developed and is freely available online. AMKdose could be useful for guiding initial amikacin dose selection before any individual pharmacokinetic information is available.
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Affiliation(s)
- Jonás Samuel Pérez-Blanco
- Department of Pharmaceutical Sciences, University of Salamanca, Pharmacy Faculty, Campus Miguel de Unamuno, 37007 Salamanca, Spain.,Institute for Biomedical Research of Salamanca (IBSAL), University Hospital of Salamanca, Hospital Virgen de la Vega, Paseo de San Vicente, 58-182, 37007 Salamanca, Spain
| | - Eva María Sáez Fernández
- Department of Pharmaceutical Sciences, University of Salamanca, Pharmacy Faculty, Campus Miguel de Unamuno, 37007 Salamanca, Spain.,Institute for Biomedical Research of Salamanca (IBSAL), University Hospital of Salamanca, Hospital Virgen de la Vega, Paseo de San Vicente, 58-182, 37007 Salamanca, Spain.,Pharmacy Service, University Hospital of Salamanca, Paseo de San Vicente, 58-182, 37007 Salamanca, Spain
| | - M Victoria Calvo
- Department of Pharmaceutical Sciences, University of Salamanca, Pharmacy Faculty, Campus Miguel de Unamuno, 37007 Salamanca, Spain.,Institute for Biomedical Research of Salamanca (IBSAL), University Hospital of Salamanca, Hospital Virgen de la Vega, Paseo de San Vicente, 58-182, 37007 Salamanca, Spain.,Pharmacy Service, University Hospital of Salamanca, Paseo de San Vicente, 58-182, 37007 Salamanca, Spain
| | - José M Lanao
- Department of Pharmaceutical Sciences, University of Salamanca, Pharmacy Faculty, Campus Miguel de Unamuno, 37007 Salamanca, Spain.,Institute for Biomedical Research of Salamanca (IBSAL), University Hospital of Salamanca, Hospital Virgen de la Vega, Paseo de San Vicente, 58-182, 37007 Salamanca, Spain
| | - Ana Martín-Suárez
- Department of Pharmaceutical Sciences, University of Salamanca, Pharmacy Faculty, Campus Miguel de Unamuno, 37007 Salamanca, Spain.,Institute for Biomedical Research of Salamanca (IBSAL), University Hospital of Salamanca, Hospital Virgen de la Vega, Paseo de San Vicente, 58-182, 37007 Salamanca, Spain
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Amikacin Combined with Fosfomycin for Treatment of Neonatal Sepsis in the Setting of Highly Prevalent Antimicrobial Resistance. Antimicrob Agents Chemother 2021; 65:e0029321. [PMID: 33972238 PMCID: PMC8373250 DOI: 10.1128/aac.00293-21] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Antimicrobial resistance (particularly through extended-spectrum β-lactamase and aminoglycoside-modifying enzyme production) in neonatal sepsis is a global problem, particularly in low- and middle-income countries, with significant mortality rates. High rates of resistance are reported for the current WHO-recommended first-line antibiotic regimen for neonatal sepsis, i.e., ampicillin and gentamicin. We assessed the utility of fosfomycin and amikacin as a potential alternative regimen to be used in settings of increasingly prevalent antimicrobial resistance. The combination was studied in a 16-arm dose-ranged hollow-fiber infection model (HFIM) experiment. The combination of amikacin and fosfomycin enhanced bactericidal activity and prevented the emergence of resistance, compared to monotherapy with either antibiotic. Modeling of the experimental quantitative outputs and data from checkerboard assays indicated synergy. We further assessed the combination regimen at clinically relevant doses in the HFIM with nine Enterobacterales strains with high fosfomycin and amikacin MICs and demonstrated successful kill to sterilization for 6/9 strains. From these data, we propose a novel combination breakpoint threshold for microbiological success for this antimicrobial combination against Enterobacterales strains, i.e., MICF × MICA < 256 (where MICF and MICA are the fosfomycin and amikacin MICs, respectively). Monte Carlo simulations predict that a standard fosfomycin-amikacin neonatal regimen would achieve >99% probability of pharmacodynamic success for strains with MICs below this threshold. We conclude that the combination of fosfomycin with amikacin is a viable regimen for the empirical treatment of neonatal sepsis and is suitable for further clinical assessment in a randomized controlled trial.
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Mana HA, Sundararaju S, Eltai NO, Al-Hadidi SH, Hasan MR, Tang P, Pérez-López A. Low-level amikacin resistance induced by AAC(6')-Ib and AAC(6')-Ib-cr in extended-spectrum β-lactamase (ESBL)-producing Enterobacterales isolated from urine in children. J Glob Antimicrob Resist 2021; 26:42-44. [PMID: 34029770 DOI: 10.1016/j.jgar.2021.04.026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 04/13/2021] [Accepted: 04/22/2021] [Indexed: 10/21/2022] Open
Affiliation(s)
- Hassan Al Mana
- Biomedical Research Centre, Qatar University, Doha, Qatar; Division of Microbiology, Sidra Medicine, Doha, Qatar
| | | | - Nahla O Eltai
- Biomedical Research Centre, Qatar University, Doha, Qatar
| | | | - Mohammad Rubayet Hasan
- Division of Microbiology, Sidra Medicine, Doha, Qatar; Weill Cornell Medical College in Qatar, Doha, Qatar
| | - Patrick Tang
- Division of Microbiology, Sidra Medicine, Doha, Qatar; Weill Cornell Medical College in Qatar, Doha, Qatar
| | - Andrés Pérez-López
- Division of Microbiology, Sidra Medicine, Doha, Qatar; Weill Cornell Medical College in Qatar, Doha, Qatar.
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Population Pharmacokinetics Analysis of Amikacin Initial Dosing Regimen in Elderly Patients. Antibiotics (Basel) 2021; 10:antibiotics10020100. [PMID: 33498481 PMCID: PMC7909551 DOI: 10.3390/antibiotics10020100] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 01/14/2021] [Accepted: 01/19/2021] [Indexed: 11/16/2022] Open
Abstract
There are limited data of amikacin pharmacokinetics (PK) in the elderly population. Hence, we aimed to describe the population PK of amikacin in elderly patients (>70 years old) and to establish optimized initial dosing regimens. We simulated individual maximum concentrations in plasma (Cmax) and minimal concentrations (Cmin) for several dosing regimens (200–2000 mg every 24, 48, and 72 h) for patients with creatinine clearance (CCr) of 10–90 mL/min and analyzed efficacy (Cmax/minimal inhibitory concentration (MIC) ≥ 8) for MICs of 4, 8, and 16 mg/L and safety (Cmin < 4 mg/L). A one-compartment model best described the data. CCr was the only covariate associated with amikacin clearance. The population PK parameter estimates were 2.25 L/h for clearance and 18.0 L for volume of distribution. Dosing simulations recommended the dosing regimens (1800 mg) with dosing intervals ranging 48–72 h for patients with CCr of 40–90 mL/min based on achievement of both efficacy for the MIC of 8 mg/L and safety. None of the dosing regimens achieved the targets for an MIC of 16 mg/L. We recommend the initial dosing regimen using a nomogram based on CCr for an MIC of ≤8 mg/L in elderly patients with CCr of 40–90 mL/min.
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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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Caceres Guido P, Perez M, Halac A, Ferrari M, Ibarra M, Licciardone N, Castaños C, Gravina LP, Jimenez C, Garcia Bournissen F, Schaiquevich P. Population pharmacokinetics of amikacin in patients with pediatric cystic fibrosis. Pediatr Pulmonol 2019; 54:1801-1810. [PMID: 31402602 DOI: 10.1002/ppul.24468] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Accepted: 07/21/2019] [Indexed: 01/20/2023]
Abstract
INTRODUCTION Amikacin is commonly used in patients with pediatric cystic fibrosis (CF) for the treatment of pulmonary exacerbations. Amikacin efficacy is related to maximum plasma concentration/minimum inhibitory concentration (Cmax/MIC) ratio >8. Pharmacokinetic data in patients with pediatric CF are scarce. The aim of this study was to develop a population pharmacokinetic (PopPK) model describing amikacin disposition in patients with pediatric CF. METHODS CF patients under 18 years of age with pulmonary exacerbation who received amikacin were enrolled. Patients received different amikacin regimens (30 mg-1 kg-1 day-1 every 8, 12, or 24 hours) depending on the patient's status and hospital protocols. Amikacin serum levels were obtained for therapeutic drug monitoring. PopPK model was developed using MONOLIX Suite-2018R1 (Lixoft). RESULTS A total of 39 patients (114 amikacin concentrations) were included in this study. Population estimates for the elimination rate constant (k) and the volume of distribution (V) were 0.541 hours-1 and 0.451 L/kg, respectively. Between-subject and between-occasion variability were 53% and 16.5% for k and 31% and 22% for V, respectively. Bodyweight was a significant covariate associated with V. Based on simulations, almost 70% of the patients receiving 30 mg-1 kg-1 day-1 every 24 hours would achieve a Cmax/MIC ratio >8 which is an appropriate therapeutic goal while no patient in the other two groups (Q8 and Q12) would achieve that objective. CONCLUSIONS The regimen of 30 mg-1 kg-1 day-1 every 24 hours more adequately fulfilled the therapeutic target for amikacin. Although all our patients had good clinical results and a good adverse-events profile, further studies are necessary to redefine the optimal treatment strategy.
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Affiliation(s)
- Paulo Caceres Guido
- Clinical Pharmacokinetics Unit, Hospital de Pediatria JP Garrahan, Buenos Aires, Argentina
| | - Mariel Perez
- Pharmacy Area, Hospital de Pediatria JP Garrahan, Buenos Aires, Argentina
| | - Alicia Halac
- Intermediate and Moderate Care Ward, Hospital de Pediatria JP Garrahan, Buenos Aires, Argentina
| | - Mariela Ferrari
- Intermediate and Moderate Care Ward, Hospital de Pediatria JP Garrahan, Buenos Aires, Argentina
| | - Manuel Ibarra
- Pharmaceutical Sciences, Department of Chemistry, Universidad de la Republica, Uruguay, Uruguay
| | - Nieves Licciardone
- Laboratory Service, Hospital de Pediatria JP Garrahan, Buenos Aires, Argentina
| | - Claudio Castaños
- Department of Pulmonology, Hospital de Pediatria JP Garrahan, Buenos Aires, Argentina
| | - Luis P Gravina
- Molecular Biology - Genetics, Hospital de Pediatria JP Garrahan, Buenos Aires, Argentina
| | - Cristina Jimenez
- Intermediate and Moderate Care Ward, Hospital de Pediatria JP Garrahan, Buenos Aires, Argentina
| | - Facundo Garcia Bournissen
- Multidisciplinary Institute for Pediatric Pathology Research (IMIPP), Hospital General de Niños R, Gutierrez, Argentina
| | - Paula Schaiquevich
- Clinical Pharmacokinetics Unit, Hospital de Pediatria JP Garrahan, Buenos Aires, Argentina.,National Scientific and Technical Research Council (CONICET), Buenos Aires, Argentina
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