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van der Veer MAA, de Haan TR, Franken LGW, Groenendaal F, Dijk PH, de Boode WP, Simons S, Dijkman KP, van Straaten HL, Rijken M, Cools F, Nuytemans DHGM, van Kaam AH, Bijleveld YA, Mathôt RAA. Predictive Performance of a Gentamicin Pharmacokinetic Model in Term Neonates with Perinatal Asphyxia Undergoing Controlled Therapeutic Hypothermia. Ther Drug Monit 2024; 46:376-383. [PMID: 38287875 PMCID: PMC11078285 DOI: 10.1097/ftd.0000000000001166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Accepted: 10/24/2023] [Indexed: 01/31/2024]
Abstract
BACKGROUND Model validation procedures are crucial when population pharmacokinetic (PK) models are used to develop dosing algorithms and to perform model-informed precision dosing. We have previously published a population PK model describing the PK of gentamicin in term neonates with perinatal asphyxia during controlled therapeutic hypothermia (TH), which showed altered gentamicin clearance during the hypothermic phase dependent on gestational age and weight. In this study, the predictive performance and generalizability of this model were assessed using an independent data set of neonates with perinatal asphyxia undergoing controlled TH. METHODS The external data set contained a subset of neonates included in the prospective observational multicenter PharmaCool Study. Predictive performance was assessed by visually inspecting observed-versus-predicted concentration plots and calculating bias and precision. In addition, simulation-based diagnostics, model refitting, and bootstrap analyses were performed. RESULTS The external data set included 323 gentamicin concentrations of 39 neonates. Both the model-building and external data set included neonates from multiple centers. The original gentamicin PK model predicted the observed gentamicin concentrations with adequate accuracy and precision during all phases of controlled TH. Model appropriateness was confirmed with prediction-corrected visual predictive checks and normalized prediction distribution error analyses. Model refitting to the merged data set (n = 86 neonates with 935 samples) showed accurate estimation of PK parameters. CONCLUSIONS The results of this external validation study justify the generalizability of the gentamicin dosing recommendations made in the original study for neonates with perinatal asphyxia undergoing controlled TH (5 mg/kg every 36 or 24 h with gestational age 36-41 and 42 wk, respectively) and its applicability in model-informed precision dosing.
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Affiliation(s)
- Marlotte A. A. van der Veer
- Department of Pharmacy & Clinical Pharmacology, Amsterdam University Medical Center, Amsterdam, the Netherlands
| | - Timo R. de Haan
- Department of Neonatology, Emma Children's Hospital, Amsterdam University Medical Center, Amsterdam, the Netherlands
| | - Linda G. W. Franken
- Department of Pharmacy & Clinical Pharmacology, Amsterdam University Medical Center, Amsterdam, the Netherlands
| | - Floris Groenendaal
- Department of Neonatology, Wilhelmina Children's Hospital, Utrecht, The Netherlands
- UMC Utrecht Brain Center, University Medical Center Utrecht and Utrecht University, Utrecht, The Netherlands
| | - Peter H. Dijk
- Division of Neonatology, Department of Pediatrics, University Medical Center Groningen, Beatrix Children's Hospital, University of Groningen, Groningen, the Netherlands
| | - Willem P. de Boode
- Department of Neonatology, Radboud University Medical Center, Radboud Institute for Health Sciences, Amalia Children's Hospital, Nijmegen, The Netherlands
| | - Sinno Simons
- Department of Neonatal and Pediatric Intensive Care, Division of Neonatology, Erasmus MC-Sophia Children's Hospital, Rotterdam, The Netherlands
| | - Koen P. Dijkman
- Department of Neonatology, Máxima Medical Center Veldhoven, Veldhoven, The Netherlands
| | | | - Monique Rijken
- Department of Neonatology, Willem-Alexander Children's Hospital, Leiden University Medical Center, Leiden, The Netherlands; and
| | - Filip Cools
- Department of Neonatology, Vrije Universiteit Brussel, Brussels, Belgium
| | - Debbie H. G. M. Nuytemans
- Department of Neonatology, Emma Children's Hospital, Amsterdam University Medical Center, Amsterdam, the Netherlands
| | - Anton H. van Kaam
- Department of Neonatology, Emma Children's Hospital, Amsterdam University Medical Center, Amsterdam, the Netherlands
| | - Yuma. A. Bijleveld
- Department of Pharmacy & Clinical Pharmacology, Amsterdam University Medical Center, Amsterdam, the Netherlands
| | - Ron A. A. Mathôt
- Department of Pharmacy & Clinical Pharmacology, Amsterdam University Medical Center, Amsterdam, the Netherlands
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2
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Gatti M, Pea F. The expert clinical pharmacological advice program for tailoring on real-time antimicrobial therapies with emerging TDM candidates in special populations: how the ugly duckling turned into a swan. Expert Rev Clin Pharmacol 2023; 16:1035-1051. [PMID: 37874608 DOI: 10.1080/17512433.2023.2274984] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Accepted: 10/20/2023] [Indexed: 10/25/2023]
Abstract
INTRODUCTION The growing spread of infections caused by multidrug-resistant pathogens makes the need of tailoring antimicrobial therapies by means of a 'patient-centered' approach fundamental. In this scenario, therapeutic drug monitoring (TDM) of emerging antimicrobial candidates may be a valuable approach, but expert interpretation of TDM results should be granted for making them more clinically useful. The MD Clinical Pharmacologist may take over this task since this specialist may couple PK/PD expertise on drugs with a medical background and may provide expert interpretation of TDM results of antimicrobials for tailoring therapy on real-time in each single patient based on specific both drug/pathogen issues and patient issues. AREAS COVERED This article aims to highlight the main key-points and organizational aspects for implementing a successful TDM-based expert clinical pharmacological advice (ECPA) program for tailoring antimicrobial therapies on real-time in different hospitalized patient special populations. EXPERT OPINION TDM-based ECPA programs lead by the MD Clinical Pharmacologist may represent a way forward for maximizing clinical efficacy and for minimizing the risk of resistance developments and/or toxicity of antimicrobials. Stakeholders should be aware of the fact that this innovative approach may be cost-effective.
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Affiliation(s)
- Milo Gatti
- Department of Medical and Surgical Sciences, Alma Mater Studiorum, University of Bologna, Bologna, Italy
- Clinical Pharmacology Unit, Department for Integrated Infectious Risk Management, IRCCS Azienda Ospedaliero Universitaria di Bologna, Bologna, Italy
| | - Federico Pea
- Department of Medical and Surgical Sciences, Alma Mater Studiorum, University of Bologna, Bologna, Italy
- Clinical Pharmacology Unit, Department for Integrated Infectious Risk Management, IRCCS Azienda Ospedaliero Universitaria di Bologna, Bologna, Italy
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3
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Črček M, Grabnar I, Zdovc JA, Grosek Š, Kos MK. External validation of population pharmacokinetic models of gentamicin in paediatric population from preterm newborns to adolescents. ACTA PHARMACEUTICA (ZAGREB, CROATIA) 2023; 73:175-194. [PMID: 37307377 DOI: 10.2478/acph-2023-0027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 05/04/2023] [Indexed: 06/14/2023]
Abstract
The aim of this study was to externally validate the predictive performance of published population pharmacokinetic models of gentamicin in all paediatric age groups, from preterm newborns to adolescents. We first selected published population pharmacokinetic models of gentamicin developed in the paediatric population with a wide age range. The parameters of the literature models were then re-estimated using the PRIOR subroutine in NONMEM®. The predictive ability of the literature and the tweaked models was evaluated. Retrospectively collected data from a routine clinical practice (512 concentrations from 308 patients) were used for validation. The models with covariates characterising developmental changes in clearance and volume of distribution had better predictive performance, which improved further after re-estimation. The tweaked model by Wang 2019 performed best, with suitable accuracy and precision across the complete paediatric population. For patients treated in the intensive care unit, a lower proportion of patients would be expected to reach the target trough concentration at standard dosing. The selected model could be used for model-informed precision dosing in clinical settings where the entire paediatric population is treated. However, for use in clinical practice, the next step should include additional analysis of the impact of intensive care treatment on gentamicin pharmacokinetics, followed by prospective validation.
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Affiliation(s)
- Mateja Črček
- 1University of Ljubljana, Faculty of Pharmacy, Department of Biopharmacy and Pharmacokinetics, 1000 Ljubljana Slovenia
| | - Iztok Grabnar
- 1University of Ljubljana, Faculty of Pharmacy, Department of Biopharmacy and Pharmacokinetics, 1000 Ljubljana Slovenia
| | - Jurij Aguiar Zdovc
- 1University of Ljubljana, Faculty of Pharmacy, Department of Biopharmacy and Pharmacokinetics, 1000 Ljubljana Slovenia
| | - Štefan Grosek
- 2University of Ljubljana, Faculty of Medicine, Department of Pediatrics 1000 Ljubljana, Slovenia
- 3University Medical Centre Ljubljana Division of Obstetrics and Gynecology, Department of Perinatology Neonatology Section, 1000 Ljubljana Slovenia
- 4University Medical Centre Ljubljana Division of Paediatrics, Department of Paediatric Intensive Therapy, 1000 Ljubljana, Slovenia
| | - Mojca Kerec Kos
- 1University of Ljubljana, Faculty of Pharmacy, Department of Biopharmacy and Pharmacokinetics, 1000 Ljubljana Slovenia
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4
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Hollander EM, van Tuinen EL, Schölvinck EH, Bergman KA, Bourgonje AR, Gracchi V, Kneyber MCJ, Touw DJ, Mian P. Evaluation of Dosing Guidelines for Gentamicin in Neonates and Children. Antibiotics (Basel) 2023; 12:antibiotics12050810. [PMID: 37237713 DOI: 10.3390/antibiotics12050810] [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: 03/24/2023] [Revised: 04/17/2023] [Accepted: 04/23/2023] [Indexed: 05/28/2023] Open
Abstract
Although aminoglycosides are frequently prescribed to neonates and children, the ability to reach effective and safe target concentrations with the currently used dosing regimens remains unclear. This study aims to evaluate the target attainment of the currently used dosing regimens for gentamicin in neonates and children. We conducted a retrospective single-center cohort study in neonates and children receiving gentamicin between January 2019 and July 2022, in the Beatrix Children's Hospital. The first gentamicin concentration used for therapeutic drug monitoring was collected for each patient, in conjunction with information on dosing and clinical status. Target trough concentrations were ≤1 mg/L for neonates and ≤0.5 mg/L for children. Target peak concentrations were 8-12 mg/L for neonates and 15-20 mg/L for children. In total, 658 patients were included (335 neonates and 323 children). Trough concentrations were outside the target range in 46.2% and 9.9% of neonates and children, respectively. Peak concentrations were outside the target range in 46.0% and 68.7% of neonates and children, respectively. In children, higher creatinine concentrations were associated with higher gentamicin trough concentrations. This study corroborates earlier observational studies showing that, with a standard dose, drug concentration targets were met in only approximately 50% of the cases. Our findings show that additional parameters are needed to improve target attainment.
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Affiliation(s)
- Esther M Hollander
- Department of Clinical Pharmacy and Pharmacology, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - Eline L van Tuinen
- Department of Clinical Pharmacy and Pharmacology, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - Elisabeth H Schölvinck
- Department of Pediatric Infectious Diseases, Beatrix Children's Hospital, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - Klasien A Bergman
- Division of Neonatology, Department of Pediatrics, Beatrix Children's Hospital, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - Arno R Bourgonje
- Department of Gastroenterology and Hepatology, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands
| | - Valentina Gracchi
- Division of Pediatric Nephrology, Beatrix Children's Hospital, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - Martin C J Kneyber
- Division of Peadiatric Critical Care Medicine, Department of Paediatrics, Beatrix Children's Hospital Groningen, University Medical Center Groningen, University of Groningen Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - Daan J Touw
- Department of Clinical Pharmacy and Pharmacology, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
- Department of Pharmaceutical Analysis, Groningen Research Institute for Pharmacy, University of Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - Paola Mian
- Department of Clinical Pharmacy and Pharmacology, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
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Mendoza-Palomar N, Vima J, Soler-Palacin P, Castillo-Salinas F. Antimicrobial therapeutic drug monitoring in a high-complexity neonatal intensive care unit within a paediatric antibiotic stewardship program. ENFERMEDADES INFECCIOSAS Y MICROBIOLOGIA CLINICA (ENGLISH ED.) 2023; 41:58-59. [PMID: 36621249 DOI: 10.1016/j.eimce.2022.01.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Accepted: 01/23/2022] [Indexed: 01/09/2023]
Affiliation(s)
- Natalia Mendoza-Palomar
- Pediatric Infectious Diseases and Immunodeficiencies Unit, Mother and Child Area, Hospital Universitari Vall d'Hebron, Barcelona, Spain; Pediatric Antibiotic Stewardship Program (PROA-NEN), Mother and Child Area, Hospital Universitari Vall d'Hebron, Barcelona, Spain; Vall d'Hebron Research Institute, Barcelona, Spain
| | - Jaume Vima
- Vall d'Hebron Research Institute, Barcelona, Spain; Special Biochemistry Laboratory, Central Clinical Laboratories, Hospital Universitari Vall d'Hebron, Barcelona, Spain
| | - Pere Soler-Palacin
- Pediatric Infectious Diseases and Immunodeficiencies Unit, Mother and Child Area, Hospital Universitari Vall d'Hebron, Barcelona, Spain; Pediatric Antibiotic Stewardship Program (PROA-NEN), Mother and Child Area, Hospital Universitari Vall d'Hebron, Barcelona, Spain; Vall d'Hebron Research Institute, Barcelona, Spain.
| | - Félix Castillo-Salinas
- Pediatric Antibiotic Stewardship Program (PROA-NEN), Mother and Child Area, Hospital Universitari Vall d'Hebron, Barcelona, Spain; Vall d'Hebron Research Institute, Barcelona, Spain; Neonatology Department, Mother and Child Area, Hospital Universitari Vall d'Hebron, Barcelona, Spain
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6
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Kayser N, Cunningham K, Alabsi S, Smith H. Targeting Lower Serum Trough Concentrations: A New Gentamicin Dosing Strategy for Suspected Neonatal Early-Onset Sepsis. J Pediatr Pharmacol Ther 2023; 28:71-77. [PMID: 36777986 PMCID: PMC9901316 DOI: 10.5863/1551-6776-28.1.71] [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: 11/10/2020] [Accepted: 06/09/2021] [Indexed: 02/05/2023]
Abstract
OBJECTIVE Neonatal gentamicin dosing algorithms are not designed to achieve serum trough concentrations ≤1 mcg/mL. The purpose of our study was to evaluate a new gentamicin algorithm based on serum creatinine (SCr) and gestational age (GA) designed to achieve serum gentamicin trough concentrations ≤1 mcg/mL. METHODS A retrospective cohort study was conducted in a level IIIB neonatal intensive care unit. The incidence of elevated serum gentamicin troughs for this study was compared with the center's previously published results to evaluate the proposed dosing algorithm. Patients were included if gentamicin was administered within the first 7 days of life and a serum gentamicin trough concentration and a baseline SCr concentration were obtained. Patients were further subdivided into groups based on GA for data analysis: ≤30 weeks (group 1), 30-34 weeks (group 2), and ≥35 weeks (group 3). The SCr was considered mildly elevated (0.81-0.99 mg/dL) or elevated (≥1 mg/dL). The respective outcomes between the post-algorithm and control groups were examined using intention-to-treat analysis and Bayesian modeling to calculate rate differences. RESULTS Of the 2377 patients evaluated, 366 met the inclusion criteria. Significantly lower percentages of elevated serum gentamicin troughs were noted in groups 2 and 3 subsequent to the implementation of the dosing algorithm with 16% and 15% lower rate differences, respectively. Regardless of GA, there were significantly fewer elevated serum troughs in the post-implementation groups than in the control with mildly elevated and elevated SCr p < 0.001. CONCLUSIONS Using a dosing algorithm based on SCr significantly reduced the number of elevated serum trough rates in neonates with a GA greater than 30 weeks.
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Affiliation(s)
- Nicholas Kayser
- Department of Pharmacy (NK, KC), UnityPoint Des Moines–Blank Children's Hospital, Des Moines, IA
| | - Kelli Cunningham
- Department of Pharmacy (NK, KC), UnityPoint Des Moines–Blank Children's Hospital, Des Moines, IA
| | - Samir Alabsi
- Neonatal Intensive Care Unit (SA), UnityPoint Des Moines–Blank Children's Hospital, Des Moines, IA
| | - Hayden Smith
- Education and Research Department (HS), UnityPoint Des Moines–Iowa Methodist Medical Center, Des Moines, IA
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7
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Evaluating and Improving Neonatal Gentamicin Pharmacokinetic Models Using Aggregated Routine Clinical Care Data. Pharmaceutics 2022; 14:pharmaceutics14102089. [PMID: 36297524 PMCID: PMC9609639 DOI: 10.3390/pharmaceutics14102089] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Revised: 09/03/2022] [Accepted: 09/09/2022] [Indexed: 11/16/2022] Open
Abstract
Model-informed precision dosing (MIPD) can aid dose decision-making for drugs such as gentamicin that have high inter-individual variability, a narrow therapeutic window, and a high risk of exposure-related adverse events. However, MIPD in neonates is challenging due to their dynamic development and maturation and by the need to minimize blood sampling due to low blood volume. Here, we investigate the ability of six published neonatal gentamicin population pharmacokinetic models to predict gentamicin concentrations in routine therapeutic drug monitoring from nine sites in the United State (n = 475 patients). We find that four out of six models predicted with acceptable levels of error and bias for clinical use. These models included known important covariates for gentamicin PK, showed little bias in prediction residuals over covariate ranges, and were developed on patient populations with similar covariate distributions as the one assessed here. These four models were refit using the published parameters as informative Bayesian priors or without priors in a continuous learning process. We find that refit models generally reduce error and bias on a held-out validation data set, but that informative prior use is not uniformly advantageous. Our work informs clinicians implementing MIPD of gentamicin in neonates, as well as pharmacometricians developing or improving PK models for use in MIPD.
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8
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Antimicrobial therapeutic drug monitoring in a high-complexity neonatal intensive care unit within a paediatric antibiotic stewardship program. Enferm Infecc Microbiol Clin 2022. [DOI: 10.1016/j.eimc.2022.01.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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9
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Anibaletto Dos Santos AL, Cezimbra da Silva AC, Feltraco Lizot LDL, Schneider A, Meireles YF, Hahn RZ, Pagnussat LR, Nonnenmacher JL, Hahn SR, Linden R. Development and validation of an assay for the measurement of gentamicin concentrations in dried blood spots using UHPLC-MS/MS. J Pharm Biomed Anal 2022; 208:114448. [PMID: 34740086 DOI: 10.1016/j.jpba.2021.114448] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Revised: 10/24/2021] [Accepted: 10/25/2021] [Indexed: 01/06/2023]
Abstract
Gentamicin sulfate (GEN) is an aminoglycoside antibiotic with a narrow therapeutic range of plasma concentrations. The collection of venous blood represents a significant burden for patients, especially in neonatology. Dried blood spots (DBS) obtained from capillary blood can be an alternative for drug measurements in this particular population. This study aimed to develop and validate an assay for the quantification of GEN in DBS using UHPLC-MS/MS. Total GEN concentrations were obtained by adding the individual concentrations of the GEN forms C1, C1a, and C2. The assay used a DBS disk containing approximately 17 μL of blood for GEN quantitation in the range of 0.1-40 mg L-1. Measurement accuracy for total GEN was in the range of 102.6-108.6%, inter-assay precision was 11.3-13.1% and intra-assay precision was 9.1-12.8.% GEN was stable for 21 days at - 20 and 8 °C, but only for 24 h at room temperature. Blood Hct affected the accuracy within acceptable limits (93.8-95% at Hct% of 30, 104.3-113% at Hct% of 50). Blood spotted volume did not affect GEN measurement accuracy. Concentrations of GEN in DBS obtained after heel pricks were correlated to plasma levels in a small cohort of neonatal patients. However, percentual differences between estimated plasma concentrations and actual plasma levels presented values between - 64-35.3% (average difference of - 1.9%). The use of DBS for the measurement of GEN concentrations can increase access to TDM of this antibiotic due to the ease of sample collection and the facilitated specimen transportation logistics when testing is not available onsite.
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Affiliation(s)
- Ana Laura Anibaletto Dos Santos
- Analytical Toxicology Laboratory, Universidade Feevale, Novo Hamburgo, RS, Brazil; Graduate Program on Toxicology and Analytical Toxicology, Universidade Feevale, Brazil
| | - Anne Caroline Cezimbra da Silva
- Analytical Toxicology Laboratory, Universidade Feevale, Novo Hamburgo, RS, Brazil; Graduate Program on Toxicology and Analytical Toxicology, Universidade Feevale, Brazil
| | - Lilian de Lima Feltraco Lizot
- Analytical Toxicology Laboratory, Universidade Feevale, Novo Hamburgo, RS, Brazil; Graduate Program on Toxicology and Analytical Toxicology, Universidade Feevale, Brazil
| | - Anelise Schneider
- Graduate Program on Toxicology and Analytical Toxicology, Universidade Feevale, Brazil
| | | | - Roberta Zilles Hahn
- Analytical Toxicology Laboratory, Universidade Feevale, Novo Hamburgo, RS, Brazil
| | | | | | | | - Rafael Linden
- Analytical Toxicology Laboratory, Universidade Feevale, Novo Hamburgo, RS, Brazil; Graduate Program on Toxicology and Analytical Toxicology, Universidade Feevale, Brazil.
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10
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Development of the Swiss Database for dosing medicinal products in pediatrics. Eur J Pediatr 2022; 181:1221-1231. [PMID: 34739591 PMCID: PMC8897330 DOI: 10.1007/s00431-021-04304-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 10/18/2021] [Accepted: 10/23/2021] [Indexed: 11/19/2022]
Abstract
In daily paediatrics, drugs are commonly used off-label, as they are not approved for children. Approval is lacking because the required clinical studies were limited to adults in the past. Without clinical studies, evidence-based recommendations for drug use in children are limited. Information on off-label drug dosing in children can be found in different handbooks, databases and scientific publications but the dosing recommendations can differ considerably. To improve safety and efficacy of drugs prescribed to children and to assist the prescribers, stakeholders in Swiss paediatrics started a pilot project, supported by the Federal Office of Public Health, with the aim to create a database, providing healthcare professionals with so called "harmonised" dosage recommendations based on the latest available scientific evidence and best clinical practice. A standardised process for dosage harmonisation between paediatric experts was defined, guided and documented in an electronic tool, developed for this purpose. As proof of principle, a total of 102 dosage recommendations for 30 different drugs have been nationally harmonised in the pilot phase considering the current scientific literature and the approval of the most experienced national experts in the field.Conclusion: This approach paved the way for unified national dosage recommendations for children. Reaching the project's milestones fulfilled the prerequisites for funding and starting regular operation of SwissPedDose in 2018. Since then, the database was extended with recommendations for 100 additional drugs. What is Known: • Prescribing off-label is a common practice among paediatricians, as many drugs are still not authorised for use in children. • Some countries developed national drug formularies providing off-label dosage recommendations. What is New: • Comparison of published dosage recommendations in known drug handbooks and online databases show substantial differences and heterogeneity, revealing the need for harmonisation. • The design of a tool for standardised harmonisation of dosage recommendations, based on information collected on currently applied dosages, latest scientific evidence and the approval of experts.
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11
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Goers R, Coman Schmid D, Jäggi VF, Paioni P, Okoniewski MJ, Parker A, Bangerter B, Georgakopoulou S, Sengstag T, Bielicki J, Tilen R, Vermeul S, Krämer SD, Berger C, Rinn B, Meyer Zu Schwabedissen HE. SwissPK cdw - A clinical data warehouse for the optimization of pediatric dosing regimens. CPT-PHARMACOMETRICS & SYSTEMS PHARMACOLOGY 2021; 10:1578-1587. [PMID: 34729953 PMCID: PMC8673996 DOI: 10.1002/psp4.12723] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 09/01/2021] [Accepted: 09/17/2021] [Indexed: 11/10/2022]
Abstract
Clinical trials have been performed mainly in adults and accordingly the necessary information is lacking for pediatric patients, especially regarding dosage recommendation for approved drugs. This gap in information could be filled with results from pharmacokinetic (PK) modeling, based on data collected in daily clinical routine. In order to make this data accessible and usable for research, the Swiss Pharmacokinetics Clinical Data Warehouse (SwissPKcdw) project has been set up, including a clinical data warehouse (CDW) and the regulatory framework for data transfer and use within. Embedded into the secure BioMedIT network, the CDW can connect to various data providers and researchers in order to collaborate on the data securely. Due to its modularity, partially containerized deployment and open‐source software, each of the components can be extended, modified, and re‐used for similar projects that require integrated data management, data analysis, and web tools in a secure scientific data and information technology (IT) environment. Here, we describe a collaborative and interprofessional effort to implement the aforementioned infrastructure between several partners from medical health care and academia. Furthermore, we describe a real‐world use case where blood samples from pediatric patients were analyzed for the presence of genetic polymorphisms and the results were aggregated and further analyzed together with the health‐related patient data in the SwissPKcdw.
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Affiliation(s)
- Roland Goers
- Biopharmacy, Department of Pharmaceutical Sciences, University of Basel, Basel, Switzerland
| | | | - Vera F Jäggi
- Division of Infectious Diseases and Hospital Epidemiology, University Children's Hospital Zürich, Zürich, Switzerland
| | - Paolo Paioni
- Division of Infectious Diseases and Hospital Epidemiology, University Children's Hospital Zürich, Zürich, Switzerland
| | | | - Althea Parker
- Scientific IT Services, ETH Zürich, Zürich, Switzerland
| | - Beat Bangerter
- Division of Infectious Diseases and Hospital Epidemiology, University Children's Hospital Zürich, Zürich, Switzerland
| | | | - Thierry Sengstag
- Center for Scientific Computing, University of Basel, Basel, Switzerland.,Swiss Institute of Bioinformatics, Lausanne, Switzerland
| | - Julia Bielicki
- Pediatric Pharmacology and Pharmacometrics Research, University Children's Hospital Basel, Basel, Switzerland
| | - Romy Tilen
- Biopharmacy, Department of Pharmaceutical Sciences, University of Basel, Basel, Switzerland.,Division of Infectious Diseases and Hospital Epidemiology, University Children's Hospital Zürich, Zürich, Switzerland
| | - Swen Vermeul
- Scientific IT Services, ETH Zürich, Zürich, Switzerland
| | - Stefanie D Krämer
- Biopharmacy, Institute of Pharmaceutical Sciences, Department of Chemistry and Applied Biosciences, ETH Zürich, Zürich, Switzerland
| | - Christoph Berger
- Division of Infectious Diseases and Hospital Epidemiology, University Children's Hospital Zürich, Zürich, Switzerland
| | - Bernd Rinn
- Scientific IT Services, ETH Zürich, Zürich, Switzerland.,Swiss Institute of Bioinformatics, Lausanne, Switzerland
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12
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Gatti M, Cojutti PG, Campoli C, Caramelli F, Corvaglia LT, Lanari M, Pession A, Ramirez S, Viale P, Pea F. A Proof of Concept of the Role of TDM-Based Clinical Pharmacological Advices in Optimizing Antimicrobial Therapy on Real-Time in Different Paediatric Settings. Front Pharmacol 2021; 12:755075. [PMID: 34646143 PMCID: PMC8502823 DOI: 10.3389/fphar.2021.755075] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2021] [Accepted: 09/13/2021] [Indexed: 01/14/2023] Open
Abstract
Introduction: Antimicrobial treatment is quite common among hospitalized children. The dynamic age-associated physiological variations coupled with the pathophysiological alterations caused by underlying illness and potential drug-drug interactions makes the implementation of appropriate antimicrobial dosing extremely challenging among paediatrics. Therapeutic drug monitoring (TDM) may represent a valuable tool for assisting clinicians in optimizing antimicrobial exposure. Clinical pharmacological advice (CPA) is an approach based on the correct interpretation of the TDM result by the MD Clinical Pharmacologist in relation to specific underlying conditions, namely the antimicrobial susceptibility of the clinical isolate, the site of infection, the pathophysiological characteristics of the patient and/or the drug-drug interactions of cotreatments. The aim of this study was to assess the role of TDM-based CPAs in providing useful recommendations for the real-time personalization of antimicrobial dosing regimens in various paediatric settings. Materials and methods: Paediatric patients who were admitted to different settings of the IRCCS Azienda Ospedaliero-Universitaria of Bologna, Italy (paediatric intensive care unit [ICU], paediatric onco-haematology, neonatology, and emergency paediatric ward), between January 2021 and June 2021 and who received TDM-based CPAs on real-time for personalization of antimicrobial therapy were retrospectively assessed. Demographic and clinical features, CPAs delivered in relation to different settings and antimicrobials, and type of dosing adjustments were extracted. Two indicators of performance were identified. The number of dosing adjustments provided over the total number of delivered CPAs. The turnaround time (TAT) of CPAs according to a predefined scale (optimal, <12 h; quasi-optimal, between 12-24 h; acceptable, between 24-48 h; suboptimal, >48 h). Results: Overall, 247 CPAs were delivered to 53 paediatric patients (mean 4.7 ± 3.7 CPAs/patient). Most were delivered to onco-haematological patients (39.6%) and to ICU patients (35.8%), and concerned mainly isavuconazole (19.0%) and voriconazole (17.8%). Overall, CPAs suggested dosing adjustments in 37.7% of cases (24.3% increases and 13.4% decreases). Median TAT was 7.5 h (IQR 6.1-8.8 h). Overall, CPAs TAT was optimal in 91.5% of cases, and suboptimal in only 0.8% of cases. Discussion: Our study provides a proof of concept of the helpful role that TDM-based real-time CPAs may have in optimizing antimicrobial exposure in different challenging paediatric scenarios.
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Affiliation(s)
- Milo Gatti
- Department of Medical and Surgical Sciences, Alma Mater Studiorum University of Bologna, Bologna, Italy.,SSD Clinical Pharmacology, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - Pier Giorgio Cojutti
- SSD Clinical Pharmacology, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - Caterina Campoli
- Infectious Diseases Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - Fabio Caramelli
- Pediatric Intensive Care Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - Luigi Tommaso Corvaglia
- Department of Medical and Surgical Sciences, Alma Mater Studiorum University of Bologna, Bologna, Italy.,Neonatal Intensive Care Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - Marcello Lanari
- Department of Medical and Surgical Sciences, Alma Mater Studiorum University of Bologna, Bologna, Italy.,Pediatric Emergency Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - Andrea Pession
- Department of Medical and Surgical Sciences, Alma Mater Studiorum University of Bologna, Bologna, Italy.,Pediatric Oncology & Hematology Unit 'Lalla Seràgnoli', IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | | | - Pierluigi Viale
- Department of Medical and Surgical Sciences, Alma Mater Studiorum University of Bologna, Bologna, Italy.,Infectious Diseases Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - Federico Pea
- Department of Medical and Surgical Sciences, Alma Mater Studiorum University of Bologna, Bologna, Italy.,SSD Clinical Pharmacology, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
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13
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Paioni P, Jäggi VF, Tilen R, Seiler M, Baumann P, Bräm DS, Jetzer C, Haid RTU, Goetschi AN, Goers R, Müller D, Coman Schmid D, Meyer zu Schwabedissen HE, Rinn B, Berger C, Krämer SD. Gentamicin Population Pharmacokinetics in Pediatric Patients-A Prospective Study with Data Analysis Using the saemix Package in R. Pharmaceutics 2021; 13:1596. [PMID: 34683889 PMCID: PMC8541459 DOI: 10.3390/pharmaceutics13101596] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Revised: 09/21/2021] [Accepted: 09/26/2021] [Indexed: 01/13/2023] Open
Abstract
The aminoglycoside gentamicin is used for the empirical treatment of pediatric infections. It has a narrow therapeutic window. In this prospective study at University Children's Hospital Zurich, Switzerland, we aimed to characterize the pharmacokinetics of gentamicin in pediatric patients and predict plasma concentrations at typical recommended doses. We recruited 109 patients aged from 1 day to 14 years, receiving gentamicin (7.5 mg/kg at age ≥ 7 d or 5 mg/kg). Plasma levels were determined 30 min, 4 h and 24 h after the infusion was stopped and then transferred, together with patient data, to the secure BioMedIT node Leonhard Med. Population pharmacokinetic modeling was performed with the open-source R package saemix on the SwissPKcdw platform in Leonhard Med. Data followed a two-compartment model. Bodyweight, plasma creatinine and urea were identified as covariates for clearance, with bodyweight as a covariate for central and peripheral volumes of distribution. Simulations with 7.5 mg/kg revealed a 95% CI of 13.0-21.2 mg/L plasma concentration at 30 min after the stopping of a 30-min infusion. At 24 h, 95% of simulated plasma levels were <1.8 mg/L. Our study revealed that the recommended dosing is appropriate. It showed that population pharmacokinetic modeling using R provides high flexibility in a secure environment.
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Affiliation(s)
- Paolo Paioni
- Division of Infectious Diseases and Hospital Epidemiology, University Children’s Hospital Zurich, Steinwiesstrasse 75, CH-8032 Zurich, Switzerland; (V.F.J.); (R.T.)
| | - Vera F. Jäggi
- Division of Infectious Diseases and Hospital Epidemiology, University Children’s Hospital Zurich, Steinwiesstrasse 75, CH-8032 Zurich, Switzerland; (V.F.J.); (R.T.)
| | - Romy Tilen
- Division of Infectious Diseases and Hospital Epidemiology, University Children’s Hospital Zurich, Steinwiesstrasse 75, CH-8032 Zurich, Switzerland; (V.F.J.); (R.T.)
- Biopharmacy, Department Pharmaceutical Sciences, University Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland; (R.G.); (H.E.M.z.S.)
| | - Michelle Seiler
- Pediatric Emergency Department, University Children’s Hospital Zurich, Steinwiesstrasse 75, CH-8032 Zurich, Switzerland;
| | - Philipp Baumann
- Department of Intensive Care and Neonatology, University Children’s Hospital Zurich, Steinwiesstrasse 75, CH-8032 Zurich, Switzerland;
| | - Dominic S. Bräm
- Biopharmacy, Institute of Pharmaceutical Sciences, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 4, CH-8093 Zurich, Switzerland; (D.S.B.); (C.J.); (R.T.U.H.); (A.N.G.)
| | - Carole Jetzer
- Biopharmacy, Institute of Pharmaceutical Sciences, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 4, CH-8093 Zurich, Switzerland; (D.S.B.); (C.J.); (R.T.U.H.); (A.N.G.)
| | - Robin T. U. Haid
- Biopharmacy, Institute of Pharmaceutical Sciences, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 4, CH-8093 Zurich, Switzerland; (D.S.B.); (C.J.); (R.T.U.H.); (A.N.G.)
| | - Aljoscha N. Goetschi
- Biopharmacy, Institute of Pharmaceutical Sciences, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 4, CH-8093 Zurich, Switzerland; (D.S.B.); (C.J.); (R.T.U.H.); (A.N.G.)
| | - Roland Goers
- Biopharmacy, Department Pharmaceutical Sciences, University Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland; (R.G.); (H.E.M.z.S.)
| | - Daniel Müller
- Institute of Clinical Chemistry, University Hospital Zurich, Rämistr. 100, CH-8091 Zurich, Switzerland;
| | - Diana Coman Schmid
- Scientific IT Services, ETH Zurich, Binzmühlestrasse 130, CH-8092 Zurich, Switzerland; (D.C.S.); (B.R.)
- SIB Swiss Institute of Bioinformatics, Quartier Sorge-Batiment Amphipole, CH-1015 Lausanne, Switzerland
| | | | - Bernd Rinn
- Scientific IT Services, ETH Zurich, Binzmühlestrasse 130, CH-8092 Zurich, Switzerland; (D.C.S.); (B.R.)
- SIB Swiss Institute of Bioinformatics, Quartier Sorge-Batiment Amphipole, CH-1015 Lausanne, Switzerland
| | - Christoph Berger
- Division of Infectious Diseases and Hospital Epidemiology, University Children’s Hospital Zurich, Steinwiesstrasse 75, CH-8032 Zurich, Switzerland; (V.F.J.); (R.T.)
| | - Stefanie D. Krämer
- Biopharmacy, Institute of Pharmaceutical Sciences, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 4, CH-8093 Zurich, Switzerland; (D.S.B.); (C.J.); (R.T.U.H.); (A.N.G.)
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14
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Gentamicin Dosing in Neonates with Normal Renal Function: Trough and Peak Levels. Eur J Drug Metab Pharmacokinet 2021; 46:677-684. [PMID: 34370216 DOI: 10.1007/s13318-021-00708-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/26/2021] [Indexed: 10/20/2022]
Abstract
BACKGROUND AND OBJECTIVE: Gentamicin is commonly used in neonates, and it requires drug concentration monitoring. The objective of this study was to determine the extent of high trough (≥ 2 mg/l) and therapeutic peak serum gentamicin concentrations (5-12 mg/l) using our current gentamicin regimen and to adjust the dosing regimen accordingly and reassess. METHODS This was a prospective cohort study of neonates, with normal renal function, who were prescribed gentamicin. Group 1: March 2014-July 2017-gentamicin intravenous (IV) 2.5 mg/kg given every 36 h if < 30 weeks gestational age (GA) and every 24 h if ≥ 30 weeks GA; Group 2: August 2019-February 2020-gentamicin IV 3.5 mg/kg given every 36 h if < 30 weeks GA and every 24 h if ≥ 30 weeks GA. We assessed the number of neonates with aberrant trough and peak serum gentamicin concentrations. RESULTS Forty-eight neonates < 30 weeks GA and 34 ≥ 30 weeks GA were given 2.5 mg/kg gentamicin. Eleven (23%) neonates < 30 weeks GA and four (13%) ≥ 30 weeks GA had subtherapeutic peak concentrations (< 5 mg/l); none had supratherapeutic (> 12 mg/l) or toxic trough concentrations (≥ 2 mg/l). Forty-four neonates < 30 weeks GA and 54 ≥ 30 weeks GA were given 3.5 mg/kg gentamicin. Eighty-four (86%) had non-toxic trough concentrations (< 2 mg/l). One (1%) < 30 weeks GA neonate had subtherapeutic (< 5 mg/l) and one (1%) neonate ≥ 30 weeks GA had supratherapeutic (> 12 mg/l) peak concentrations. CONCLUSIONS Gentamicin regimen of 2.5 mg/kg given every 36 h for neonates < 30 weeks GA and every 24 h for neonates ≥ 30 weeks GA was suboptimal at achieving therapeutic gentamicin peak. Increasing the dosage to 3.5 mg/kg achieved therapeutic peak concentrations in 98% and non-toxic trough concentrations in 86% of all neonates (prior to dose interval adjustment).
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15
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D'Agate S, Musuamba FT, Jacqz-Aigrain E, Della Pasqua O. Simplified Dosing Regimens for Gentamicin in Neonatal Sepsis. Front Pharmacol 2021; 12:624662. [PMID: 33762945 PMCID: PMC7982486 DOI: 10.3389/fphar.2021.624662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Accepted: 01/04/2021] [Indexed: 11/30/2022] Open
Abstract
Background: The effectiveness of antibiotics for the treatment of severe bacterial infections in newborns in resource-limited settings has been determined by empirical evidence. However, such an approach does not warrant optimal exposure to antibiotic agents, which are known to show different disposition characteristics in this population. Here we evaluate the rationale for a simplified regimen of gentamicin taking into account the effect of body size and organ maturation on pharmacokinetics. The analysis is supported by efficacy data from a series of clinical trials in this population. Methods: A previously published pharmacokinetic model was used to simulate gentamicin concentration vs. time profiles in a virtual cohort of neonates. Model predictive performance was assessed by supplementary external validation procedures using therapeutic drug monitoring data collected in neonates and young infants with or without sepsis. Subsequently, clinical trial simulations were performed to characterize the exposure to intra-muscular gentamicin after a q.d. regimen. The selection of a simplified regimen was based on peak and trough drug levels during the course of treatment. Results: In contrast to current World Health Organization guidelines, which recommend gentamicin doses between 5 and 7.5 mg/kg, our analysis shows that gentamicin can be used as a fixed dose regimen according to three weight-bands: 10 mg for patients with body weight <2.5 kg, 16 mg for patients with body weight between 2.5 and 4 kg, and 30 mg for those with body weight >4 kg. Conclusion: The choice of the dose of an antibiotic must be supported by a strong scientific rationale, taking into account the differences in drug disposition in the target patient population. Our analysis reveals that a simplified regimen is feasible and could be used in resource-limited settings for the treatment of sepsis in neonates and young infants with sepsis aged 0–59 days.
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Affiliation(s)
- S D'Agate
- Clinical Pharmacology and Therapeutics Group, University College London, London, United Kingdom
| | - F Tshinanu Musuamba
- Clinical Pharmacology and Therapeutics Group, University College London, London, United Kingdom
| | - E Jacqz-Aigrain
- Department of Paediatric Pharmacology and Pharmacogenetics, Centre Hospitalier Universitaire, Hôpital Robert Debré, Paris, France
| | - O Della Pasqua
- Clinical Pharmacology and Therapeutics Group, University College London, London, United Kingdom
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16
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Arakawa S, Kasai M, Kawai S, Sakata H, Mayumi T. The JAID/JSC guidelines for management of infectious diseases 2017 - Sepsis and catheter-related bloodstream infection. J Infect Chemother 2021; 27:657-677. [PMID: 33558043 DOI: 10.1016/j.jiac.2019.11.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 10/28/2019] [Accepted: 11/29/2019] [Indexed: 12/14/2022]
Affiliation(s)
| | | | - Masashi Kasai
- Division of Infectious Disease, Department of Pediatrics, Hyogo Prefectural Kobe Children's Hospital, Hyogo, Japan
| | - Shin Kawai
- The Department of General Medicine, Kyorin University School of Medicine, Tokyo, Japan
| | - Hiroshi Sakata
- Department of Pediatrics, Asahikawa Kosei Hospital, Hokkaido, Japan
| | - Toshihiko Mayumi
- Department of Emergency and Critical Care Medicine,University of Occupational and Environmental Health, Fukuoka, Japan
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17
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Simulated Comparison of a Bayesian Clinical Decision Support System Versus Standard of Care For Achieving Gentamicin Pharmacokinetic Targets in Neonates. Pediatr Infect Dis J 2020; 39:313-317. [PMID: 32032171 PMCID: PMC7182238 DOI: 10.1097/inf.0000000000002592] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Gentamicin therapy in neonates is optimized through achieving specific peak and trough concentrations. The objective of this study was to compare the ability a Bayesian clinical decision support system (CDSS) with standard of care (SOC) in determining personalized gentamicin therapies for neonates, at regimen initiation and in response to measured drug concentrations. METHODS This retrospective review and simulation compared target attainment among 4 arms: historical dosing according to SOC, via nomogram for initial dosing (SOC-initial) and via clinician judgment in response to measured concentrations (SOC-adjusted), and simulated dosing using the CDSS, incorporating a neonatal pharmacokinetic model for initial dosing (CDSS-initial) and incorporating maximum a posteriori-Bayesian analysis in response to measured concentrations (CDSS-adjusted). "True" patient pharmacokinetic parameters and peak and trough concentration predictions were calculated via the CDSS using the entirety of the patient dosing and concentration history. The primary outcome was pharmacokinetic target attainment of desired gentamicin peak and trough concentrations. RESULTS The study included 564 gentamicin concentrations among 339 patients. Mean demographics were 35 weeks gestational age (52% premature births) and 2.44 kg dosing weight. Mean PK parameters were 0.0533 L/h/kg clearance, 0.458 L/kg volume of distribution, and 8.66 hours half-life. Peak concentrations in the desired range were achieved in 96% of significantly more often in the CDSS-initial regimens and 94% of CDSS-adjusted regimens versus 86% of SOC-initial regimens and 66% of SOC-adjusted regimens. No difference was found in trough target attainment among study groups. CONCLUSIONS In simulation, a Bayesian CDSS showed superiority to SOC in achieving gentamicin pharmacokinetic exposure targets in neonates. Use of a CDSS may improve the safety and efficacy of gentamicin therapy for neonates.
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18
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Hollander C, Joubert K, Schellack N. An Ototoxicity Grading System Within a Mobile App (OtoCalc) for a Resource-Limited Setting to Guide Grading and Management of Drug-Induced Hearing Loss in Patients With Drug-Resistant Tuberculosis: Prospective, Cross-Sectional Case Series. JMIR Mhealth Uhealth 2020; 8:e14036. [PMID: 31934875 PMCID: PMC6996762 DOI: 10.2196/14036] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2019] [Revised: 07/09/2019] [Accepted: 08/19/2019] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND Tuberculosis (TB) affects millions of people worldwide and is treated with medication including aminoglycosides and polypeptides. Individuals respond differently to medications as a result of their genetic inheritance. These differences in genetic inheritance can result in the underdosing or overdosing of medication, which may affect the efficacy or, in the case of aminoglycosides and polypeptides used in the treatment of all forms of TB, result in ototoxicity. When ototoxicity is detected, physicians should adjust dosages to minimize further ototoxicity and hearing loss; however, there are no suitable grading systems to define significant hearing loss. OBJECTIVE The aim of this study was to develop a standardized grading system by making use of an electronic health (eHealth) platform to ensure that a user-friendly method was available to interpret hearing test results, calculate significant hearing loss, and provide recommendations with regard to dosage adjustments and management. It further aimed to establish the sensitivity of the newly developed grading scale. METHODS This grading system was developed in South Africa based on data that were obtained from an audiology and pharmacokinetic study on patients with drug-resistant TB (DR-TB) at two DR-TB units at state-run hospitals. This feasibility study employed a prospective, cross-sectional, exploratory, descriptive case series research design, with a total of 22 participants. Participants underwent audiological and pharmacological assessments at baseline and every 2 weeks for the first 3 months of treatment. Various professionals (8 in total) were subsequently involved in the development of the eHealth system, including a software engineer, four audiologists, a pharmacist, a medical doctor, and a nurse. The app underwent 14 modifications that involved aspects of data storage, ease of usability, grades, and the risk factor checklist. RESULTS An ototoxicity grading system within a mobile app for use by doctors, nurses, and audiologists was developed for patients with DR-TB. The purpose of this user-friendly ototoxicity calculator, OtoCalc, is to (1) assist health professionals in assessing patients for ototoxicity, (2) establish the clinical significance of ototoxicity by calculating the grade of hearing loss, (3) monitor the progression of hearing loss, and (4) enable systematic referral and management of patients according to their needs. CONCLUSIONS This newly developed system is more sensitive than the existing grading methods for determining ototoxicity in patients with DR-TB. This app needs to be trialed in a larger sample to establish data security, ease of use, and suitability within this population.
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Affiliation(s)
- Cara Hollander
- School of Pharmacy, Sefako Makgatho Health Sciences University, Ga-Rankuwa, South Africa
| | - Karin Joubert
- Department of Speech Pathology and Audiology, University of the Witwatersrand, Johannesburg, South Africa
| | - Natalie Schellack
- School of Pharmacy, Sefako Makgatho Health Sciences University, Ga-Rankuwa, South Africa
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19
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Hartman SJF, Orriëns LB, Zwaag SM, Poel T, de Hoop M, de Wildt SN. External Validation of Model-Based Dosing Guidelines for Vancomycin, Gentamicin, and Tobramycin in Critically Ill Neonates and Children: A Pragmatic Two-Center Study. Paediatr Drugs 2020; 22:433-444. [PMID: 32507958 PMCID: PMC7383037 DOI: 10.1007/s40272-020-00400-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND The Dutch Pediatric Formulary (DPF) increasingly bases its guidelines on model-based dosing simulations from pharmacokinetic studies. This resulted in nationwide dose changes for vancomycin, gentamicin, and tobramycin in 2015. OBJECTIVE We aimed to evaluate target attainment of these altered, model-based doses in critically ill neonates and children. METHODS This was a retrospective cohort study in neonatal intensive care unit (NICU) and pediatric ICU (PICU) patients receiving vancomycin, gentamicin, or tobramycin between January 2015 and March 2017 in two university hospitals. The first therapeutic drug monitoring concentration for each patient was collected, as was clinical and dosing information. Vancomycin and tobramycin target trough concentrations were 10-15 and ≤ 1 mg/L, respectively. Target gentamicin trough and peak concentrations were < 1 and 8-12 mg/L, respectively. RESULTS In total, 482 patients were included (vancomycin [PICU] n = 62, [NICU] n = 102; gentamicin [NICU] n = 97; tobramycin [NICU] n = 221). Overall, median trough concentrations were within the target range for all cohorts but showed large interindividual variability, causing nontarget attainment. Trough concentrations were outside the target range in 66.1%, 60.8%, 14.7%, and 23.1% of patients in these four cohorts, respectively. Gentamicin peak concentrations were outside the range in 69% of NICU patients (term neonates 87.1%, preterm infants 57.1%). Higher creatinine concentrations were associated with higher vancomycin and tobramycin trough concentrations. CONCLUSION This study illustrates the need to validate model-based dosing advice in the real-world setting as both sub- and supratherapeutic concentrations of vancomycin, gentamicin, and tobramycin were very prevalent. Our data underline the necessity for further individualization by addressing the high interindividual variability to improve target attainment.
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Affiliation(s)
- Stan J. F. Hartman
- grid.10417.330000 0004 0444 9382Department of Pharmacology and Toxicology and Department of Intensive Care, Radboud Institute of Health Sciences, Radboudumc, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Lynn B. Orriëns
- grid.10417.330000 0004 0444 9382Department of Pharmacology and Toxicology and Department of Intensive Care, Radboud Institute of Health Sciences, Radboudumc, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Samanta M. Zwaag
- grid.10417.330000 0004 0444 9382Department of Pharmacology and Toxicology and Department of Intensive Care, Radboud Institute of Health Sciences, Radboudumc, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Tim Poel
- grid.10417.330000 0004 0444 9382Department of Pharmacology and Toxicology and Department of Intensive Care, Radboud Institute of Health Sciences, Radboudumc, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
| | - Marika de Hoop
- grid.489189.50000 0001 0708 7338Royal Dutch Pharmacists Association (KNMP), Den Haag, The Netherlands ,Dutch Knowledge Center Pharmacotherapy for Children, The Hague, The Netherlands
| | - Saskia N. de Wildt
- grid.10417.330000 0004 0444 9382Department of Pharmacology and Toxicology and Department of Intensive Care, Radboud Institute of Health Sciences, Radboudumc, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands ,grid.5645.2000000040459992XIntensive Care and Department of Pediatric Surgery, Erasmus MC-Sophia Children’s Hospital, University Medical Center Rotterdam, Rotterdam, The Netherlands ,Dutch Knowledge Center Pharmacotherapy for Children, The Hague, The Netherlands
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20
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du Toit M, Burger JR, Rakumakoe DM, Rheeders M. Standards of aminoglycoside therapeutic drug monitoring in a South African private hospital: perspectives and implications. Ghana Med J 2019; 53:8-12. [PMID: 31138938 PMCID: PMC6527830 DOI: 10.4314/gmj.v53i1.2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Background Therapeutic drug monitoring (TDM) is essential to ensure that aminoglycoside peak concentrations are high enough for effective antimicrobial treatment and trough levels are low enough to minimise toxicity. Inappropriate utilisation of TDM may lead to suboptimal therapy, toxicity and waste of resources. This study aimed to investigate the standard of aminoglycoside TDM performed in adult hospitalised patients. Design An observational, descriptive, cross-sectional study. Setting A 221-bed private hospital. Participants All patients, older than 18 years, on intravenous aminoglycosides for more than 48 hours were included. Interventions None, was observational. A computerised database and patient files were used to obtain the information required for this study. Descriptive statistical analysis was used. Main outcomes measures Aminoglycoside blood levels and estimated glomerular filtration rate (eGFR) in the patients. Results One hundred and three (103) patients were included: 65 on gentamicin and 38 on amikacin. Blood levels were performed in only 19 gentamicin (29.23%) and 22 amikacin (57.89%) patients. Trough levels were taken more than 2 hours before the next dose in 12 gentamicin (63.16%) and 12 amikacin (54.54%) patients. The majority of patients (96.92% on gentamicin and 84.21% on amikacin) received once daily doses. TDM was performed in all patients with an estimated glomerular filtration rate (eGFR) lower than 60 mL/min/1.73m2 and in 23.31% of gentamicin patients and 56.76% of amikacin patients with an eGFR higher than 60 mg/min/1.73m2. Conclusions Incorrect sampling times and unnecessary levels taken in patients with normal renal function indicate a need for aminoglycoside treatment guidelines in the private hospital. Funding None
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Affiliation(s)
- Mariette du Toit
- Medicine Usage in South Africa (MUSA), Faculty of Health Sciences, North-West University, Potchefstroom, South Africa
| | - Johanita R Burger
- Medicine Usage in South Africa (MUSA), Faculty of Health Sciences, North-West University, Potchefstroom, South Africa
| | - Dorcas M Rakumakoe
- Medicine Usage in South Africa (MUSA), Faculty of Health Sciences, North-West University, Potchefstroom, South Africa
| | - Malie Rheeders
- Centre of Excellence for Pharmaceutical Science, North-West University, Potchefstroom, South Africa
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21
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Bergenwall M, Walker SAN, Elligsen M, Iaboni DC, Findlater C, Seto W, Ng E. Optimizing gentamicin conventional and extended interval dosing in neonates using Monte Carlo simulation - a retrospective study. BMC Pediatr 2019; 19:318. [PMID: 31492162 PMCID: PMC6729057 DOI: 10.1186/s12887-019-1676-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Accepted: 08/19/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Although aminoglycosides are routinely used in neonates, controversy exists regarding empiric dosing regimens. The objectives were to determine gentamicin pharmacokinetics in neonates, and develop initial mg/kg dosing recommendations that optimized target peak and trough concentration attainment for conventional and extended-interval dosing (EID) regimens. METHODS Patient demographics and steady-state gentamicin concentration data were retrospectively collected for 60 neonates with no renal impairment admitted to a level III neonatal intensive care unit. Mean pharmacokinetics were calculated and multiple linear regression was performed to determine significant covariates of clearance (L/h) and volume of distribution (L). Classification and regression tree (CART) analysis identified breakpoints for significant covariates. Monte Carlo Simulation (MCS) was used to determine optimal dosing recommendations for each CART-identified sub-group. RESULTS Gentamicin clearance and volume of distribution were significantly associated with weight at gentamicin initiation. CART-identified breakpoints for weight at gentamicin initiation were: ≤ 850 g, 851-1200 g, and > 1200 g. MCS identified that a conventional dose of gentamicin 3.5 mg/kg given every 48 h or an EID of 8-9 mg/kg administered every 72 h in neonates weighing ≤ 850 g, and every 24 and 48 h, respectively, in neonates weighing 851-1200 g, provided the best probability of attaining conventional (peak: 5-10 mg/L and trough: ≤ 2 mg/L) and EID targets (peak:12-20 mg/L, trough:≤ 0.5 mg/L). Insufficient sample size in the > 1200 g neonatal group precluded further investigation of this weight category. CONCLUSIONS This study provides initial gentamicin dosing recommendations that optimize target attainment for conventional and EID regimens in neonates weighing ≤ 1200 g. Prospective validation and empiric dose optimization for neonates > 1200 g is needed.
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Affiliation(s)
- Monique Bergenwall
- Department of Pharmacy, Sunnybrook Health Sciences Centre, 2075 Bayview Avenue, E-302, Toronto, ON M4N 3M5 Canada
- Present Address: Grandview Medical Centre Family Health Team, 167 Hespeler Rd, Cambridge, ON N1R 3H7 Canada
| | - Sandra A. N. Walker
- Department of Pharmacy, Sunnybrook Health Sciences Centre, 2075 Bayview Avenue, E-302, Toronto, ON M4N 3M5 Canada
- Leslie L. Dan Faculty of Pharmacy, University of Toronto, Toronto, ON Canada
- Division of Infectious Diseases, Sunnybrook Health Sciences Centre, Toronto, ON Canada
- Sunnybrook Health Sciences Centre Research Institute, Toronto, ON Canada
| | - Marion Elligsen
- Department of Pharmacy, Sunnybrook Health Sciences Centre, 2075 Bayview Avenue, E-302, Toronto, ON M4N 3M5 Canada
| | - Dolores C. Iaboni
- Women and Babies Program, Sunnybrook Health Sciences Centre, Toronto, ON Canada
| | - Carla Findlater
- Women and Babies Program, Sunnybrook Health Sciences Centre, Toronto, ON Canada
| | - Winnie Seto
- Leslie L. Dan Faculty of Pharmacy, University of Toronto, Toronto, ON Canada
- Department of Pharmacy, Hospital for Sick Children, Toronto, ON Canada
| | - Eugene Ng
- Women and Babies Program, Sunnybrook Health Sciences Centre, Toronto, ON Canada
- Department of Paediatrics, University of Toronto, Toronto, ON Canada
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22
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Shimizu D, Ichikawa S, Hoshina T, Kawase M, Tanaka K, Araki S, Kinjo T, Kusuhara K. The evaluation of the appropriate gentamicin use for preterm infants. Eur J Clin Microbiol Infect Dis 2019; 38:2365-2369. [PMID: 31482417 DOI: 10.1007/s10096-019-03689-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2019] [Accepted: 08/26/2019] [Indexed: 11/30/2022]
Abstract
Gentamicin (GM) is used for neonates as the initial treatment for neonatal bacterial infection. An association between high trough GM levels and the elevation of the serum creatinine (sCr) level and hearing loss has been reported, although there have been no reports investigating the serial changes in the sCr level in preterm neonates treated with GM. The present study evaluated the serial changes in the sCr level and the incidence of hearing loss in preterm neonates treated with GM. This study included 56 neonates born at a gestational age of 32-36 weeks. Fifteen (group 1) and 20 (group 2) neonates were treated with 2.5 mg/kg of GM every 12 h and 4 mg/kg of GM every 36 h, respectively. Group 3 included 21 neonates without GM therapy. Serum GM levels, serial changes in the sCr levels, and the incidence of hearing loss were then compared among the three groups. The serum trough GM level in group 2 was significantly lower than that in group 1 (P < 0.001), whereas the serum peak GM levels in these groups were almost the same. The ratio of the sCr level at birth to that at the 5th day of life in group 1 was the lowest among the 3 groups. No neonates had hearing loss. GM therapy worsened the sCr level in late preterm neonates, especially those with multiple doses per day. The appropriate use of GM is needed in order to prevent the occurrence of nephrotoxicity.
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Affiliation(s)
- Daisuke Shimizu
- Department of Pediatrics, School of Medicine, University of Occupational and Environmental Health, Japan, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu, 807-8555, Japan.,Center of Maternal, Fetal and Neonatal Medicine, Hospital of University of Occupational and Environmental Health, Japan, Kitakyushu, Japan
| | - Shun Ichikawa
- Department of Pediatrics, School of Medicine, University of Occupational and Environmental Health, Japan, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu, 807-8555, Japan.,Center of Maternal, Fetal and Neonatal Medicine, Hospital of University of Occupational and Environmental Health, Japan, Kitakyushu, Japan
| | - Takayuki Hoshina
- Department of Pediatrics, School of Medicine, University of Occupational and Environmental Health, Japan, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu, 807-8555, Japan.
| | - Mayumi Kawase
- Department of Pediatrics, School of Medicine, University of Occupational and Environmental Health, Japan, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu, 807-8555, Japan
| | - Kentaro Tanaka
- Department of Pediatrics, School of Medicine, University of Occupational and Environmental Health, Japan, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu, 807-8555, Japan.,Center of Maternal, Fetal and Neonatal Medicine, Hospital of University of Occupational and Environmental Health, Japan, Kitakyushu, Japan
| | - Shunsuke Araki
- Department of Pediatrics, School of Medicine, University of Occupational and Environmental Health, Japan, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu, 807-8555, Japan.,Center of Maternal, Fetal and Neonatal Medicine, Hospital of University of Occupational and Environmental Health, Japan, Kitakyushu, Japan
| | - Tadamune Kinjo
- Center of Maternal, Fetal and Neonatal Medicine, Hospital of University of Occupational and Environmental Health, Japan, Kitakyushu, Japan.,Department of Neonatology, Fukuoka Children's Hospital, Fukuoka, Japan
| | - Koichi Kusuhara
- Department of Pediatrics, School of Medicine, University of Occupational and Environmental Health, Japan, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu, 807-8555, Japan.,Center of Maternal, Fetal and Neonatal Medicine, Hospital of University of Occupational and Environmental Health, Japan, Kitakyushu, Japan
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23
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Relationship between amikacin blood concentration and ototoxicity in low birth weight infants. J Infect Chemother 2018; 25:17-21. [PMID: 30539740 DOI: 10.1016/j.jiac.2018.10.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Revised: 05/09/2018] [Accepted: 10/01/2018] [Indexed: 11/22/2022]
Abstract
Amikacin (AMK) is used as empiric therapy for severe infections such as sepsis in low birth weight (LBW) infants. AMK administered once daily (OD) in adults is reported to be therapeutically effective and prevent side effects, however, evidence on AMK administration in LBW infants is limited, with no clear indications of effectiveness. We performed therapeutic drug monitoring analysis of 20 infants treated with AMK OD for severe infections such as bacteremia. Treatment effectiveness was admitted by the patients' medical records, and side effects of renal dysfunction and ototoxicity were investigated. The mean gestational age was 30.4 ± 5 weeks and mean body weight (Bw) was 1280.2 ± 809.8 g. The mean AMK dose was 14.1 ± 2.6 mg/kg and mean administration period was 10.1 ± 4.1 days. Blood concentration was measured 6.3 ± 2.3 days after AMK administration; mean peak and trough concentrations were 29.1 ± 7.5 μg/mL and 7.6 ± 6.9 μg/mL, respectively. Additionally, therapeutic effect was observed in all patients, and no significant change in serum creatinine (CRE) concentration (a marker of renal dysfunction) was observed, suggesting no renal dysfunction. Ototoxicity was observed in 4 patients, 3 of whom had trough concentrations ≥10 μg/mL. When we categorized patients into two groups using a trough cut-off value of 10 μg/mL, no difference in AMK dose was observed. However, there were significant differences in peak concentration, Bw, volume of distribution and CRE. Our findings suggest AMK trough concentration ≥10 μg/mL significantly affects ototoxicity in neonates.
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24
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Ge S, Beechinor RJ, Hornik CP, Standing JF, Zimmerman K, Cohen-Wolkowiez M, Laughon MM, Clark R, Gonzalez D. External Evaluation of a Gentamicin Infant Population Pharmacokinetic Model Using Data from a National Electronic Health Record Database. Antimicrob Agents Chemother 2018; 62:e00669-18. [PMID: 29914947 PMCID: PMC6125537 DOI: 10.1128/aac.00669-18] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Accepted: 06/08/2018] [Indexed: 11/20/2022] Open
Abstract
Gentamicin is a common antibiotic used in neonates and infants. A recently published population pharmacokinetic (PK) model was developed using data from multiple studies, and the objective of our analyses was to evaluate the feasibility of using a national electronic health record (EHR) database for further external evaluation of this model. Our results suggest that, with proper data capture procedures, EHR data can serve as a potential data source for external evaluation of PK models.
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Affiliation(s)
- Shufan Ge
- Division of Pharmacotherapy and Experimental Therapeutics, UNC Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Ryan J Beechinor
- Division of Pharmacotherapy and Experimental Therapeutics, UNC Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Christoph P Hornik
- Duke Clinical Research Institute, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Pediatrics, Duke University School of Medicine, Durham, North Carolina, USA
| | - Joseph F Standing
- Inflammation, Infection, and Rheumatology Section, Great Ormond Street Institute of Child Health, University College London, London, United Kingdom
| | - Kanecia Zimmerman
- Duke Clinical Research Institute, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Pediatrics, Duke University School of Medicine, Durham, North Carolina, USA
| | - Michael Cohen-Wolkowiez
- Duke Clinical Research Institute, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Pediatrics, Duke University School of Medicine, Durham, North Carolina, USA
| | - Matthew M Laughon
- Department of Pediatrics, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Reese Clark
- Pediatrix Medical Group, Inc., Sunrise, Florida
| | - Daniel Gonzalez
- Division of Pharmacotherapy and Experimental Therapeutics, UNC Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
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25
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Lima-Rogel V, López-López EJ, Medellín-Garibay SE, Gómez-Ruiz LM, Romero-Méndez C, Milán-Segovia RC, Romano-Moreno S. Population pharmacokinetics of levetiracetam in neonates with seizures. J Clin Pharm Ther 2017; 43:422-429. [PMID: 29265480 DOI: 10.1111/jcpt.12658] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Accepted: 11/21/2017] [Indexed: 01/17/2023]
Abstract
WHAT IS KNOWN AND OBJECTIVE This study developed a population pharmacokinetic (PK) model of levetiracetam (LEV) for treating neonatal seizures (NS) and determined the influence of clinically relevant covariates to explain the interindividual variability and residual error. METHODS Twenty newborns admitted to the Neonatal Intensive Care Unit at the Hospital Central "Dr. Ignacio Morones Prieto" were included. LEV doses were administered by intermittent infusion. Blood samples were drawn 3 times post-infusion. Levetiracetam was quantified by a chromatographic technique. NONMEM software was used to determine the population PK model of LEV in neonates and the influence of clinical covariates on drug disposition. RESULTS AND DISCUSSION The LEV PK in neonates is described by a one-compartment open model with first-order elimination. The influence of creatinine clearance (CRCL) and body weight (BW) on clearance (CL[L/h] = 0.47*CRCL), as well as the volume of the distribution (Vd[L] = 0.65*BW) of LEV, were confirmed, considering interindividual variabilities of 36% and 22%, respectively, and a residual error of 13%. WHAT IS NEW AND CONCLUSION Based on the PK of LEV in neonates and the influence of the final PK model, a priori dosing guidelines are proposed considering CRCL, BW and LEV plasma concentrations between 6 and 20 mg/L for NS treatment.
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Affiliation(s)
- V Lima-Rogel
- Neonatal Intensive Care Unit, Hospital Central "Dr. Ignacio Morones Prieto", San Luis Potosí, México
| | - E J López-López
- Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí, México
| | - S E Medellín-Garibay
- Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí, México
| | - L M Gómez-Ruiz
- Neonatology Department, Nuevo Hospital Civil "Dr. Juan I. Menchaca", Guadalajara, Jalisco, México
| | - C Romero-Méndez
- Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí, México
| | - R C Milán-Segovia
- Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí, México
| | - S Romano-Moreno
- Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí, México
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26
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Moresco L, Calevo MG, Bruschettini M. Antibiotics for the management of transient tachypnea of the newborn. Hippokratia 2017. [DOI: 10.1002/14651858.cd012872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Luca Moresco
- Ospedale San Paolo Savona; Pediatric and Neonatology Unit; Savona Italy
| | - Maria Grazia Calevo
- Istituto Giannina Gaslini; Epidemiology, Biostatistics and Committees Unit; Genoa Italy 16147
| | - Matteo Bruschettini
- Lund University, Skåne University Hospital; Department of Paediatrics; Lund Sweden
- Skåne University Hospital; Research & Development, Section for HTA Analysis; Wigerthuset, Remissgatan 4, first floor room 11-221 Lund Sweden 22185
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27
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Potential biomarkers for effective screening of neonatal sepsis infections: An overview. Microb Pathog 2017; 107:234-242. [PMID: 28377234 DOI: 10.1016/j.micpath.2017.03.042] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2016] [Revised: 03/29/2017] [Accepted: 03/30/2017] [Indexed: 12/17/2022]
Abstract
Neonatal sepsis, a clinical disorder developed by bacterial blood stream infections (BSI) in neonates, is one of the serious global public health problems that must be addressed. More than one million of the estimated global newborn deaths per year are occurred due to severe infections. The genesis of the infection is divided into early-onset sepsis (EOS) and late-onset sepsis (LOS) of the disease. The clinical complications of neonatal sepsis may be associated with bronchopulmonary dysplasia, ductus arteriosus and necrotizing enterocolitis. The clinical diagnosis and treatment of neonatal sepsis is highly complicated. Over the past few years distinct biomarkers have been identified. Most widely used biomarkers are C-reactive protein, Procalcitonin (PCT) and Serum amyloid A (SAA). Until recently, many potential biomarkers including Cell Surface antigens and Bacterial surface antigens and genetic biomarkers are being investigated. Protein biomarkers, cytokines and chemokines are getting much interest for identification of neonatal sepsis infection.
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28
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Antolik TL, Cunningham KJ, Alabsi S, Reimer RA. Empirical gentamicin dosing based on serum creatinine levels in premature and term neonates. Am J Health Syst Pharm 2017; 74:466-472. [DOI: 10.2146/ajhp160061] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Affiliation(s)
- Taylar L. Antolik
- Iowa Methodist Medical Center, UnityPoint Health Des Moines, Des Moines, IA
| | | | - Samir Alabsi
- Blank Children’s Hospital, UnityPoint Health Des Moines, Des Moines, IA
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29
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Al-Metwali B, Mulla H. Personalised dosing of medicines for children. J Pharm Pharmacol 2017; 69:514-524. [DOI: 10.1111/jphp.12709] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 01/12/2017] [Indexed: 12/16/2022]
Abstract
Abstract
Objectives
Doses for most drugs are determined from population-level information, resulting in a standard ?one-size-fits-all’ dose range for all individuals. This review explores how doses can be personalised through the use of the individuals’ pharmacokinetic (PK)-pharmacodynamic (PD) profile, its particular application in children, and therapy areas where such approaches have made inroads.
Key findings
The Bayesian forecasting approach, based on population PK/PD models that account for variability in exposure and response, is a potent method for personalising drug therapy. Its potential utility is even greater in young children where additional sources of variability are observed such as maturation of eliminating enzymes and organs. The benefits of personalised dosing are most easily demonstrated for drugs with narrow therapeutic ranges such as antibiotics and cytotoxics and limited studies have shown improved outcomes. However, for a variety of reasons the approach has struggled to make more widespread impact at the bedside: complex dosing algorithms, high level of technical skills required, lack of randomised controlled clinical trials and the need for regulatory approval.
Summary
Personalised dosing will be a necessary corollary of the new precision medicine initiative. However, it faces a number of challenges that need to be overcome before such an approach to dosing in children becomes the norm.
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Affiliation(s)
- Basma Al-Metwali
- School of Pharmacy, De Montfort University, Leicester, UK
- Department of Pharmacy, Glenfield Hospital, University Hospitals of Leicester, Leicester, UK
| | - Hussain Mulla
- Department of Pharmacy, Glenfield Hospital, University Hospitals of Leicester, Leicester, UK
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30
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Rao SC, Srinivasjois R, Moon K. One dose per day compared to multiple doses per day of gentamicin for treatment of suspected or proven sepsis in neonates. Cochrane Database Syst Rev 2016; 12:CD005091. [PMID: 27921299 PMCID: PMC6464017 DOI: 10.1002/14651858.cd005091.pub4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND Animal studies and trials in older children and adults suggest that a 'one dose per day' regimen of gentamicin is superior to a 'multiple doses per day' regimen. OBJECTIVES To compare the efficacy and safety of one dose per day compared to multiple doses per day of gentamicin in suspected or proven sepsis in neonates. SEARCH METHODS Eligible studies were identified by searching the Cochrane Central Register of Controlled Trials (CENTRAL; 2016, Issue 3) in the Cochrane Library (searched 8 April 2016), MEDLINE (1966 to 8 April 2016), Embase (1980 to 8 April 2016), and CINAHL (December 1982 to 8 April 2016). SELECTION CRITERIA All randomised or quasi-randomised controlled trials comparing one dose per day ('once a day') compared to multiple doses per day ('multiple doses a day') of gentamicin to newborn infants. DATA COLLECTION AND ANALYSIS Data collection and analysis was performed according to the standards of the Cochrane Neonatal Review Group. MAIN RESULTS Eleven RCTs were included (N = 574) and 28 excluded. All except one study enrolled infants of more than 32 weeks' gestation. Limited information suggested that infants in both 'once a day' as well as 'multiple doses a day' regimens showed adequate clearance of sepsis (typical RR 1.00, 95% CI 0.84 to 1.19; typical RD 0.00, 95% CI -0.19 to 0.19; 3 trials; N = 37). 'Once a day' gentamicin regimen was associated with fewer failures to attain peak level of at least 5 µg/ml (typical RR 0.22, 95% CI 0.11 to 0.47; typical RD -0.13, 95% CI -0.19 to -0.08; number needed to treat for an additional beneficial outcome (NNTB) = 8; 9 trials; N = 422); and fewer failures to achieve trough levels of 2 µg/ml or less (typical RR 0.38, 95% CI 0.27 to 0.55; typical RD -0.22, 95% CI -0.29 to -0.15; NNTB = 4; 11 trials; N = 503). 'Once a day' gentamicin achieved higher peak levels (MD 2.58, 95% CI 2.26 to 2.89; 10 trials; N = 440) and lower trough levels (MD -0.57, 95% CI -0.69 to -0.44; 10 trials; N = 440) than 'multiple doses a day' regimen. There was no significant difference in ototoxicity between two groups (typical RR 1.69, 95% CI 0.18 to 16.25; typical RD 0.01, 95% CI -0.04 to 0.05; 5 trials; N = 214). Nephrotoxicity was not noted with either of the treatment regimens. Overall, the quality of evidence was considered to be moderate on GRADE analysis, given the small sample size and unclear/high risk of bias in some of the domains in a few of the included studies. AUTHORS' CONCLUSIONS There is insufficient evidence from the currently available RCTs to conclude whether a 'once a day' or a 'multiple doses a day' regimen of gentamicin is superior in treating proven neonatal sepsis. However, data suggest that pharmacokinetic properties of a 'once a day' gentamicin regimen are superior to a 'multiple doses a day' regimen in that it achieves higher peak levels while avoiding toxic trough levels. There was no change in nephrotoxicity or auditory toxicity. Based on the assessment of pharmacokinetics, a 'once a day regimen' may be superior in treating sepsis in neonates of more than 32 weeks' gestation.
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Affiliation(s)
- Shripada C Rao
- King Edward Memorial Hospital for Women and Princess Margaret Hospital for ChildrenCentre for Neonatal Research and EducationPerth, Western AustraliaAustralia6008
| | - Ravisha Srinivasjois
- University of Western Australia, Joondalup Health CampusNeonatology and PaediatricsJoondalupWAAustralia
| | - Kwi Moon
- Princess Margaret Hospital for ChildrenPerthAustralia
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Smits A, Kulo A, van den Anker J, Allegaert K. The amikacin research program: a stepwise approach to validate dosing regimens in neonates. Expert Opin Drug Metab Toxicol 2016; 13:157-166. [PMID: 27623706 DOI: 10.1080/17425255.2017.1234606] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
INTRODUCTION For safe and effective use of antibacterial agents in neonates, specific knowledge on the pharmacokinetics (PK) and its covariates is needed. This necessitates a stepwise approach, including prospective validation. Areas covered: We describe our approach throughout almost two decades to improve amikacin exposure in neonates. A dosing regimen has been developed and validated using pharmacometrics, considering current weight, postnatal age, perinatal asphyxia, and ibuprofen use. This regimen has been developed based on clinical and therapeutic drug monitoring (TDM) data collected during routine care, and subsequently underwent prospective validation. A similar approach has been scheduled to quantify the impact of hypothermia. Besides plasma observations, datasets on deep compartment PK were also collected. Finally, the available literature on developmental toxicology (hearing, renal) of amikacin is summarized. Expert opinion: The amikacin model reflects a semi-physiological function for glomerular filtration. Consequently, this model can be used to develop dosing regimens for other aminoglycosides or to validate physiology-based pharmacokinetic models. Future studies should explore safety with incorporation of covariates like pharmacogenetics, biomarkers, and long-term outcomes. This includes a search for mechanisms of developmental toxicity. Following knowledge generation and grading the level of evidence in support of data, dissemination and implementation initiatives are needed.
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Affiliation(s)
- Anne Smits
- a Neonatal Intensive Care Unit , VU Medical Center , Amsterdam , The Netherlands.,b Neonatal Intensive Care Unit , University Hospitals Leuven , Leuven , Belgium
| | - Aida Kulo
- c Institute of Pharmacology, Clinical Pharmacology and Toxicology, Faculty of Medicine , University of Sarajevo , Sarajevo , Bosnia Herzegovina
| | - John van den Anker
- d Intensive Care and Department of Surgery , Erasmus MC Sophia Children's Hospital , Rotterdam , The Netherlands.,e Department of Paediatric Pharmacology , University Children's Hospital Basel , Basel , Switzerland.,f Division of Pediatric Clinical Pharmacology , Children's National Medical Center , Washington , DC , USA.,g Departments of Pediatrics, Integrative Systems Biology, Pharmacology & Physiology , George Washington University School of Medicine and Health Sciences , Washington , DC , USA
| | - Karel Allegaert
- d Intensive Care and Department of Surgery , Erasmus MC Sophia Children's Hospital , Rotterdam , The Netherlands.,h Department of Development and Regeneration , KU Leuven , Leuven , Belgium
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Abstract
Therapeutic drug monitoring (TDM) aims to integrate drug measurement results into clinical decision making. The basic rules apply when using TDM in neonates (aminoglycosides, vancomycin, phenobarbital, digoxin), but additional factors should also be taken into account. First, due to both pharmacokinetic variability and non-pharmacokinetic factors, the correlation between dosage and concentration is poor in neonates, but can be overcome with the use of more complex, validated dosing regimens. Second, the time to reach steady state is prolonged, especially when no loading dose is used. Consequently, the timing of TDM sampling is important in this population. Third, the target concentration may be uncertain (vancomycin) or depend on specific factors (phenobarbital during whole body cooling). Finally, because of differences in matrix composition (eg, protein, bilirubin), assay-related inaccuracies may be different in neonates. We anticipate that complex validated dosing regimens, with subsequent TDM sampling and Bayesian forecasting, are the next step in tailoring pharmacotherapy to individual neonates.
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Affiliation(s)
- Steven Pauwels
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium Department of Laboratory Medicine, University Hospitals Leuven, Leuven, Belgium
| | - Karel Allegaert
- Department of Development and Regeneration, KU Leuven, Leuven, Belgium Neonatal Intensive Care Unit, University Hospitals Leuven, Leuven, Belgium
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Gonzalez J, Ahern J, Noyes E, Corriveau M, Mercier C. Identification of Risk Factors for Elevated Neonatal Gentamicin Trough Concentrations. J Pediatr Pharmacol Ther 2016; 21:133-9. [DOI: 10.5863/1551-6776-21.2.133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVES: The objective of this study was to identify neonatal and maternal characteristics that may be associated with elevated neonatal gentamicin trough concentrations despite application of a previously published gentamicin dosage strategy.
METHODS: Retrospective cohort study of all neonates admitted to University of Vermont Medical Center (562-bed academic teaching hospital, Burlington, VT) receiving gentamicin between June 1, 2009, and August 31, 2013. A total of 205 neonates were included, with 41 cases and 164 controls.
RESULTS: Postmenstrual age (PMA, gestational age plus chronological age) and small-for–gestational age (SGA) status were independently associated with elevated neonatal gentamicin trough concentrations. No maternal risk factor evaluated remained significantly associated in the multivariate analysis.
CONCLUSIONS: The probability of an elevated gentamicin trough concentration increases with lower PMA and is further accentuated in neonates with SGA status. In contrast, the presence of maternal risk factors did not increase the likelihood of elevated gentamicin trough concentrations. Neonates with lower PMA and SGA status may require an individualized dosage and monitoring strategy.
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Affiliation(s)
- Jeffrey Gonzalez
- Pharmacy Services, Vermont Children's Hospital, University of Vermont Medical Center, Burlington, Vermont
| | - John Ahern
- Pharmacy Services, Vermont Children's Hospital, University of Vermont Medical Center, Burlington, Vermont
| | - Elizabeth Noyes
- Pharmacy Services, Vermont Children's Hospital, University of Vermont Medical Center, Burlington, Vermont
| | - Michele Corriveau
- Pharmacy Services, Vermont Children's Hospital, University of Vermont Medical Center, Burlington, Vermont
| | - Charles Mercier
- Neonatal Intensive Care, Vermont Children's Hospital, University of Vermont Medical Center, Burlington, Vermont
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35
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Abstract
Antibiotics are invaluable in the management of neonatal infections. However, overuse or misuse of antibiotics in neonates has been associated with adverse outcomes, including increased risk for future infection, necrotizing enterocolitis, and mortality. Strategies to optimize the use of antibiotics in the neonatal intensive care unit include practicing effective infection prevention, improving the diagnostic evaluation and empiric therapy for suspected infections, timely adjustment of therapy as additional information becomes available, and treating proven infections with an effective, narrow-spectrum agent for the minimum effective duration. Antibiotic stewardship programs provide support for these strategies but require the participation and input of neonatologists as stakeholders to be most effective.
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Affiliation(s)
- Joseph B Cantey
- Division of Neonatal/Perinatal Medicine, Division of Infectious Diseases, Texas A&M Health Science Center College of Medicine, Baylor Scott & White Health, Temple, TX, USA.
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36
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Engler D, Schellack N, Naude A, Gous A. A pilot study on the use of amikacin in neonates: Who should be monitored for ototoxicity? S Afr J Infect Dis 2015. [DOI: 10.1080/23120053.2015.1074432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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37
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Fuchs A, Guidi M, Giannoni E, Werner D, Buclin T, Widmer N, Csajka C. Population pharmacokinetic study of gentamicin in a large cohort of premature and term neonates. Br J Clin Pharmacol 2015; 78:1090-101. [PMID: 24938850 DOI: 10.1111/bcp.12444] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Accepted: 06/09/2014] [Indexed: 12/01/2022] Open
Abstract
AIM This study aims to investigate the clinical and demographic factors influencing gentamicin pharmacokinetics in a large cohort of unselected premature and term newborns and to evaluate optimal regimens in this population. METHODS All gentamicin concentration data, along with clinical and demographic characteristics, were retrieved from medical charts in a Neonatal Intensive Care Unit over 5 years within the frame of a routine therapeutic drug monitoring programme. Data were described using non-linear mixed-effects regression analysis ( nonmem®). RESULTS A total of 3039 gentamicin concentrations collected in 994 preterm and 455 term newborns were included in the analysis. A two compartment model best characterized gentamicin disposition. The average parameter estimates, for a median body weight of 2170 g, were clearance (CL) 0.089 l h(-1) (CV 28%), central volume of distribution (Vc ) 0.908 l (CV 18%), intercompartmental clearance (Q) 0.157 l h(-1) and peripheral volume of distribution (Vp ) 0.560 l. Body weight, gestational age and post-natal age positively influenced CL. Dopamine co-administration had a significant negative effect on CL, whereas the influence of indomethacin and furosemide was not significant. Both body weight and gestational age significantly influenced Vc . Model-based simulations confirmed that, compared with term neonates, preterm infants need higher doses, superior to 4 mg kg(-1) , at extended intervals to achieve adequate concentrations. CONCLUSIONS This observational study conducted in a large cohort of newborns confirms the importance of body weight and gestational age for dosage adjustment. The model will serve to set up dosing recommendations and elaborate a Bayesian tool for dosage individualization based on concentration monitoring.
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Affiliation(s)
- Aline Fuchs
- Division of Clinical Pharmacology, Service of Biomedicine, Department of Laboratory, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Lausanne, Switzerland
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38
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Prospective Evaluation of a Model-Based Dosing Regimen for Amikacin in Preterm and Term Neonates in Clinical Practice. Antimicrob Agents Chemother 2015; 59:6344-51. [PMID: 26248375 DOI: 10.1128/aac.01157-15] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 07/22/2015] [Indexed: 11/20/2022] Open
Abstract
Based on a previously derived population pharmacokinetic model, a novel neonatal amikacin dosing regimen was developed. The aim of the current study was to prospectively evaluate this dosing regimen. First, early (before and after second dose) therapeutic drug monitoring (TDM) observations were evaluated for achieving target trough (<3 mg/liter) and peak (>24 mg/liter) levels. Second, all observed TDM concentrations were compared with model-predicted concentrations, whereby the results of a normalized prediction distribution error (NPDE) were considered. Subsequently, Monte Carlo simulations were performed. Finally, remaining causes limiting amikacin predictability (i.e., prescription errors and disease characteristics of outliers) were explored. In 579 neonates (median birth body weight, 2,285 [range, 420 to 4,850] g; postnatal age 2 days [range, 1 to 30 days]; gestational age, 34 weeks [range, 24 to 41 weeks]), 90.5% of the observed early peak levels reached 24 mg/liter, and 60.2% of the trough levels were <3 mg/liter (93.4% ≤5 mg/liter). Observations were accurately predicted by the model without bias, which was confirmed by the NPDE. Monte Carlo simulations showed that peak concentrations of >24 mg/liter were reached at steady state in almost all patients. Trough values of <3 mg/liter at steady state were documented in 78% to 100% and 45% to 96% of simulated cases with and without ibuprofen coadministration, respectively; suboptimal trough levels were found in patients with postnatal age <14 days and current weight of >2,000 g. Prospective evaluation of a model-based neonatal amikacin dosing regimen resulted in optimized peak and trough concentrations in almost all patients. Slightly adapted dosing for patient subgroups with suboptimal trough levels was proposed. This model-based approach improves neonatal dosing individualization.
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Dersch-Mills D, Akierman A, Alshaikh B, Sundaram A, Yusuf K. Performance of a dosage individualization table for extended interval gentamicin in neonates beyond the first week of life. J Matern Fetal Neonatal Med 2015; 29:1451-6. [DOI: 10.3109/14767058.2015.1051021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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40
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Losoya-Leal A, Estevez MC, Martínez-Chapa SO, Lechuga LM. Design of a surface plasmon resonance immunoassay for therapeutic drug monitoring of amikacin. Talanta 2015; 141:253-8. [PMID: 25966411 DOI: 10.1016/j.talanta.2015.04.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Revised: 03/24/2015] [Accepted: 04/02/2015] [Indexed: 10/23/2022]
Abstract
The therapeutic drug monitoring (TDM) of pharmaceutical drugs with narrow therapeutic ranges is of great importance in the clinical setting. It provides useful information towards the enhancement of drug therapies, aiding in dosage control and toxicity risk management. Amikacin is an aminoglycoside antibiotic commonly used in neonatal therapies that is indicated for TDM due to the toxicity risks inherent in its use. Current techniques for TDM such as high performance liquid chromatography (HPLC) and gas chromatography-mass spectrometry (GC-MS) are costly, time consuming, and cannot be performed at the site of action. Over the last decades, surface plasmon resonance (SPR) biosensors have become increasingly popular in clinical diagnostics due to their ability to detect biomolecular interactions in real-time. We present an SPR-based competitive immunoassay for the detection of the antibiotic amikacin, suitable for TDM in both adults and neonates. We have obtained high specificity and sensitivity levels with an IC50 value of 1.4ng/mL and a limit of detection of 0.13ng/mL, which comfortably comply with the drug's therapeutic range. Simple dilution of serum can therefore be sufficient to analyze low-volume real samples from neonates, increasing the potential of the methodology for TDM. Compared to current TDM conventional methods, this SPR-based immunoassay can provide advantages such as simplicity, potential portability, and label-free measurements with the possibility of high throughput. This work is the foundation towards the development of an integrated, simple use, highly sensitive, fast, and point-of-care sensing platform for the opportune TDM of antibiotics and other drugs in a clinical setting.
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Affiliation(s)
- Adrian Losoya-Leal
- Sensors and Devices Group, School of Engineering and Sciences, Tecnológico de Monterrey, México
| | - M-Carmen Estevez
- CIBER-BBN Networking Center on Bioengineering, Biomaterials and Nanomedicine, Spain; Nanobiosensors and Bioanalytical Applications Group, Institut Català de Nanociència i Nanotecnologia (ICN2), CSIC, 08193 Bellaterra, Barcelona, Spain.
| | - Sergio O Martínez-Chapa
- Sensors and Devices Group, School of Engineering and Sciences, Tecnológico de Monterrey, México
| | - Laura M Lechuga
- Nanobiosensors and Bioanalytical Applications Group, Institut Català de Nanociència i Nanotecnologia (ICN2), CSIC, 08193 Bellaterra, Barcelona, Spain; CIBER-BBN Networking Center on Bioengineering, Biomaterials and Nanomedicine, Spain
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41
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Felter SP, Daston GP, Euling SY, Piersma AH, Tassinari MS. Assessment of health risks resulting from early-life exposures: Are current chemical toxicity testing protocols and risk assessment methods adequate? Crit Rev Toxicol 2015; 45:219-44. [PMID: 25687245 DOI: 10.3109/10408444.2014.993919] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract Over the last couple of decades, the awareness of the potential health impacts associated with early-life exposures has increased. Global regulatory approaches to chemical risk assessment are intended to be protective for the diverse human population including all life stages. However, questions persist as to whether the current testing approaches and risk assessment methodologies are adequately protective for infants and children. Here, we review physiological and developmental differences that may result in differential sensitivity associated with early-life exposures. It is clear that sensitivity to chemical exposures during early-life can be similar, higher, or lower than that of adults, and can change quickly within a short developmental timeframe. Moreover, age-related exposure differences provide an important consideration for overall susceptibility. Differential sensitivity associated with a life stage can reflect the toxicokinetic handling of a xenobiotic exposure, the toxicodynamic response, or both. Each of these is illustrated with chemical-specific examples. The adequacy of current testing protocols, proposed new tools, and risk assessment methods for systemic noncancer endpoints are reviewed in light of the potential for differential risk to infants and young children.
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42
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Population pharmacokinetics of gentamicin and dosing optimization for infants. Antimicrob Agents Chemother 2014; 59:482-9. [PMID: 25385111 DOI: 10.1128/aac.03464-14] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The aim of this study was to characterize and validate the population pharmacokinetics of gentamicin in infants and to determine the influences of clinically relevant covariates to explain the inter- and intraindividual variabilities associated with this drug. Infants receiving intravenous gentamicin and with routine therapeutic drug monitoring were consecutively enrolled in the study. Plasma concentration and time data were retrospectively collected from 208 infants (1 to 24 months old) of the Hospital Universitario Severo Ochoa (Spain), of whom 44% were males (mean age [± standard deviation], 5.8 ± 4.8 months; mean body weight, 6.4 ± 2.2 kg). Data analysis was performed with NONMEM 7.2. One- and two-compartment open models were analyzed to estimate the gentamicin population parameters and the influences of several covariates. External validation was carried out in another population of 55 infants. The behavior of gentamicin in infants exhibits two-compartment pharmacokinetics, with total body weight being the covariate that mainly influences central volume (Vc) and clearance (CL); this parameter was also related to creatinine clearance. Both parameters are age related and different from those reported for neonatal populations. On the basis of clinical presentation and diagnosis, a once-daily dosage regimen of 7 mg/kg of body weight every 24 h is proposed for intravenous gentamicin, followed by therapeutic drug monitoring in order to avoid toxicity and ensure efficacy with minimal blood sampling. Gentamicin pharmacokinetics and disposition were accurately characterized in this pediatric population (infants), with the parameters obtained being different from those reported for neonates and children. These differences should be considered in the dosing and therapeutic monitoring of this antibiotic.
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43
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Manage neonatal sepsis with prompt initiation of empirical antibacterial therapy, followed by targeted therapy. DRUGS & THERAPY PERSPECTIVES 2014. [DOI: 10.1007/s40267-014-0137-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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44
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Abstract
Early-onset sepsis remains a common and serious problem for neonates, especially preterm infants. Group B streptococcus (GBS) is the most common etiologic agent, while Escherichia coli is the most common cause of mortality. Current efforts toward maternal intrapartum antimicrobial prophylaxis have significantly reduced the rates of GBS disease but have been associated with increased rates of Gram-negative infections, especially among very-low-birth-weight infants. The diagnosis of neonatal sepsis is based on a combination of clinical presentation; the use of nonspecific markers, including C-reactive protein and procalcitonin (where available); blood cultures; and the use of molecular methods, including PCR. Cytokines, including interleukin 6 (IL-6), interleukin 8 (IL-8), gamma interferon (IFN-γ), and tumor necrosis factor alpha (TNF-α), and cell surface antigens, including soluble intercellular adhesion molecule (sICAM) and CD64, are also being increasingly examined for use as nonspecific screening measures for neonatal sepsis. Viruses, in particular enteroviruses, parechoviruses, and herpes simplex virus (HSV), should be considered in the differential diagnosis. Empirical treatment should be based on local patterns of antimicrobial resistance but typically consists of the use of ampicillin and gentamicin, or ampicillin and cefotaxime if meningitis is suspected, until the etiologic agent has been identified. Current research is focused primarily on development of vaccines against GBS.
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Mahmoudi L, Mohammadpour AH, Niknam R, Ahmadi A, Mojtahedzdeh M. Limited sampling strategy for estimation of amikacin optimal sampling time in critically ill adults. Anaesth Intensive Care 2014; 42:228-33. [PMID: 24580389 DOI: 10.1177/0310057x1404200210] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Aminoglycosides are a class of antibiotics that are commonly used in the treatment of gram-negative pathogens in the critically ill population. Unfortunately, dosing of these aminoglycosides in critically ill patients is difficult due to their altered pharmacokinetics in the critically ill and narrow therapeutic index. In this study, we evaluated whether a limited sampling strategy can be used to predict the area under the concentration (AUC) curve of amikacin concentrations over a 24-hour period after a single dose of intravenous amikacin (25 mg/kg). This open-labelled, non-comparative prospective study recruited 20 adult critically ill trauma patients with a diagnosis of hospital-acquired infection. We assessed the best estimate of plasma amikacin concentrations over a 24-hour period by multiple stepwise regression, using nine blood samples during this study period as the gold standard. Using a jackknife procedure, the AUC of amikacin over a 24-hour period was estimated by choosing a combination of the amikacin concentrations measured at different time-points. Overall, the mean prediction error of all models was not statistically different from zero (P >0.05). Based on bias and imprecision, all models gave good estimate of AUC of amikacin over a 24-hour period, but a two-point sampling strategy at 1.5 and 6 hours post-dose appeared to offer the best compromise between accuracy and cost-effectiveness in optimising the dosing of amikacin in critically ill patients.
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Affiliation(s)
- L Mahmoudi
- General Intensive Care Unit, Sina Teachning Hospital affiliated to the School of Medicine, Tehran University of Medical Sciences
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46
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Abstract
The management of neonatal sepsis is challenging owing to complex developmental and environmental factors that contribute to inter-individual variability in the pharmacokinetics and pharmacodynamics of many antimicrobial agents. In this review, we describe (i) the changing epidemiology of early- and late-onset neonatal sepsis; (ii) the pharmacologic considerations that influence the safety and efficacy of antibacterials, antifungals, and immunomodulatory adjuvants; and (iii) the recommended dosing regimens for pharmacologic agents commonly used in the treatment and prevention of neonatal sepsis. Neonatal sepsis is marked by high morbidity and mortality, such that prompt initiation of antimicrobial therapy is essential following culture collection. Before culture results are available, combination therapy with ampicillin and an aminoglycoside is recommended. When meningitis is suspected, ampicillin and cefotaxime may be considered. Following identification of the causative organism and in vitro susceptibility testing, antimicrobial therapy may be narrowed to provide targeted coverage. Therapeutic drug monitoring should be considered for neonates receiving vancomycin or aminoglycoside therapies. For neonates with invasive fungal infections, the development of new antifungal agents has significantly improved therapeutic outcomes in recent years. Liposomal amphotericin B has been found to be safe and efficacious in patients with renal impairment or toxicity caused by conventional amphotericin B. Antifungal prophylaxis with fluconazole has also been reported to dramatically reduce rates of neonatal invasive fungal infections and to improve long-term neurodevelopmental outcomes among treated children. Additionally, several large multicenter studies are currently investigating the safety and efficacy of oral lactoferrin as an immunoprophylactic agent for the prevention of neonatal sepsis.
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47
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Vučićević K, Rakonjac Z, Miljković B, Janković B, Prostran M. Pharmacokinetic Variability of Amikacin After Once-Daily and Twice-Daily Dosing Regimen in Full-Term Neonates. J Pharmacol Sci 2014; 124:138-43. [DOI: 10.1254/jphs.13126fp] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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48
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Abstract
It is important to monitor renal function in the neonate, especially in premature infants where nephrogenesis is still in process upon birth. The kidneys are responsible for maintaining homeostasis in the extracellular environment by preventing overaccumulation of waste products and electrolytes. This review describes developmental physiology of the renal system as well as laboratory testing to monitor renal function and glomerular filtration in neonates. Drugs that may affect renal function in infants are also discussed.
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49
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Dose optimisation of antibiotics in children: application of pharmacokinetics/pharmacodynamics in paediatrics. Int J Antimicrob Agents 2013; 43:223-30. [PMID: 24389079 DOI: 10.1016/j.ijantimicag.2013.11.006] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Accepted: 11/11/2013] [Indexed: 11/24/2022]
Abstract
The judicious use of antibiotics to combat infections in children relies upon appropriate selection of an agent, dose and duration to maximise efficacy and to minimise toxicity. Critical to dose optimisation is an understanding of the pharmacokinetics and pharmacodynamics of available drugs. Optimal dosing strategies may take advantage of pharmacokinetic/pharmacodynamic (PK/PD) principles so that antibiotic dosing can be individualised to assure effective bacterial killing in patients who have altered pharmacokinetics or who have infections with less susceptible or resistant organisms. This review will outline the fundamentals of antimicrobial pharmacokinetics/pharmacodynamics through discussion of antibacterial agents most often used in children. We aim to highlight the importance of dose optimisation in paediatrics and describe non-conventional dosing strategies that can take advantage of PK/PD principles at the bedside.
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50
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Kamei M, Kasperski K, Fuller M, Parkinson-Lawrence EJ, Karageorgos L, Belakhov V, Baasov T, Hopwood JJ, Brooks DA. Aminoglycoside-Induced Premature Stop Codon Read-Through of Mucopolysaccharidosis Type I Patient Q70X and W402X Mutations in Cultured Cells. JIMD Rep 2013; 13:139-47. [PMID: 24193436 DOI: 10.1007/8904_2013_270] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Revised: 08/13/2013] [Accepted: 09/25/2013] [Indexed: 12/24/2022] Open
Abstract
The premature stop codon mutations, Q70X and W402X, are the most common α-L-iduronidase gene (IDUA) mutations in mucopolysaccharidosis type I (MPS I) patients. Read-through drugs have been used to suppress premature stop codons, and this can potentially be used to treat patients who have this type of mutation. We examined the effects of aminoglycoside treatment on the IDUA mutations Q70X and W402X in cultured cells and show that 4,5-disubstituted aminoglycosides induced more read-through for the W402X mutation, while 4,6-disubstituted aminoglycosides promoted more read-through for the Q70X mutation: lividomycin (4,5-disubstituted) induced a 7.8-fold increase in α-L-iduronidase enzyme activity for the W402X mutation; NB54 (4,5-disubstituted) induced a 3.7 fold increase in the amount of α-L-iduronidase enzyme activity for the W402X mutation, but had less effect on the Q70X mutation, whereas gentamicin (4,6-disubstituted) had the reverse effect on read-through for both mutations. The predicted mRNA secondary structural changes for both mutations were markedly different, which may explain these different effects on read-through for these two premature stop codons.
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Affiliation(s)
- Makoto Kamei
- Mechanisms in Cell Biology and Diseases Research Group, School of Pharmacy and Medical Sciences, Sansom Institute for Health Research, University of South Australia, Adelaide, South Australia, 5001, Australia,
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