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Walker H, O'Reilly E, Millard Z, Cusack B, Duncan A, Clucas L, Fleming J, Hughes D, Greenway A, Metz D. Small but mighty: Case report and practical guidance for peripheral blood stem cell collection in small infants. J Clin Apher 2024; 39:e22141. [PMID: 39060110 DOI: 10.1002/jca.22141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Revised: 05/31/2024] [Accepted: 07/11/2024] [Indexed: 07/28/2024]
Abstract
Modern apheresis devices, with increased procedural precision, automation, and monitoring, have been shown to allow for safe delivery of apheresis therapies in young children. Medical advances are increasing demand for apheresis procedures like mononuclear cell collection in infants <10 kg, including stem-cell supported chemotherapy, cell collection for chimeric antigen receptor T cell development, and now ex vivo gene therapies for rare genetic diseases. Nevertheless, safe delivery in small infants involves a range of unique considerations and challenges, beyond just size, and experience will vary between centers. In this case report we describe our experience performing mononuclear cell collection in our smallest patient to date and outline a practice guideline developed following a literature review and discussion with both international experts and device representatives. This case may help to inform other clinicians aiming to provide apheresis care to very small infants in their own centers.
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Affiliation(s)
- Hannah Walker
- Children's Cancer Centre, The Royal Children's Hospital, Melbourne, Victoria, Australia
- Apheresis Service, The Royal Children's Hospital, Melbourne, Victoria, Australia
- Murdoch Children's Research Institute, Melbourne, Victoria, Australia
- Division of Paediatrics, The University of Melbourne, Melbourne, Victoria, Australia
| | - Erin O'Reilly
- Department of Clinical Haematology, The Royal Children's Hospital, Melbourne, Victoria, Australia
| | - Zoe Millard
- Apheresis Service, The Royal Children's Hospital, Melbourne, Victoria, Australia
| | - Brendan Cusack
- Apheresis Service, The Royal Children's Hospital, Melbourne, Victoria, Australia
- Department of Nephrology, The Royal Children's Hospital, Melbourne, Victoria, Australia
| | - Anna Duncan
- Apheresis Service, The Royal Children's Hospital, Melbourne, Victoria, Australia
| | - Luisa Clucas
- Apheresis Service, The Royal Children's Hospital, Melbourne, Victoria, Australia
- Department of Clinical Haematology, The Royal Children's Hospital, Melbourne, Victoria, Australia
| | - Jacqueline Fleming
- Children's Cancer Centre, The Royal Children's Hospital, Melbourne, Victoria, Australia
- Apheresis Service, The Royal Children's Hospital, Melbourne, Victoria, Australia
| | - David Hughes
- Children's Cancer Centre, The Royal Children's Hospital, Melbourne, Victoria, Australia
- Apheresis Service, The Royal Children's Hospital, Melbourne, Victoria, Australia
| | - Anthea Greenway
- Apheresis Service, The Royal Children's Hospital, Melbourne, Victoria, Australia
- Department of Clinical Haematology, The Royal Children's Hospital, Melbourne, Victoria, Australia
| | - David Metz
- Apheresis Service, The Royal Children's Hospital, Melbourne, Victoria, Australia
- Murdoch Children's Research Institute, Melbourne, Victoria, Australia
- Department of Nephrology, The Royal Children's Hospital, Melbourne, Victoria, Australia
- Department of Paediatrics, Monash University, Melbourne, Victoria, Australia
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2
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Tenenbein M. The One Pill Can Kill Myth. Pediatr Emerg Care 2024; 40:495-497. [PMID: 38587052 DOI: 10.1097/pec.0000000000003166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
ABSTRACT "One Pill Can Kill" is a meme originating in the 1990s. This construct lists pharmaceuticals that have the alleged potential for fatality after the ingestion of a single pill by a toddler. However, its foundation is fundamentally flawed because it contravenes a basic principle of pediatric pharmacology, allometric scaling. Other than opioids, there are no literature examples of one pill killing a toddler. The negative outcome of the one pill can kill construct is inappropriate management manifested by over-referral of young children by poison centers to emergency departments for care, overly prolonged emergency department observation and needless hospital admissions. A more accurate construct is that one pill of anything other than opioids will not kill anybody with the caveat being that we are referring to regulated pharmaceuticals.
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Affiliation(s)
- Milton Tenenbein
- From the Pediatrics and Child Health, Emergency Medicine and Community Health Sciences, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba Canada
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3
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Sanghavi K, Ribbing J, Rogers JA, Ahmed MA, Karlsson MO, Holford N, Chasseloup E, Ahamadi M, Kowalski KG, Cole S, Kerwash E, Wade JR, Liu C, Wang Y, Trame MN, Zhu H, Wilkins JJ. Covariate modeling in pharmacometrics: General points for consideration. CPT Pharmacometrics Syst Pharmacol 2024; 13:710-728. [PMID: 38566433 PMCID: PMC11098153 DOI: 10.1002/psp4.13115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 01/15/2024] [Accepted: 02/05/2024] [Indexed: 04/04/2024] Open
Abstract
Modeling the relationships between covariates and pharmacometric model parameters is a central feature of pharmacometric analyses. The information obtained from covariate modeling may be used for dose selection, dose individualization, or the planning of clinical studies in different population subgroups. The pharmacometric literature has amassed a diverse, complex, and evolving collection of methodologies and interpretive guidance related to covariate modeling. With the number and complexity of technologies increasing, a need for an overview of the state of the art has emerged. In this article the International Society of Pharmacometrics (ISoP) Standards and Best Practices Committee presents perspectives on best practices for planning, executing, reporting, and interpreting covariate analyses to guide pharmacometrics decision making in academic, industry, and regulatory settings.
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Affiliation(s)
| | | | | | - Mariam A. Ahmed
- Quantitative Clinical Pharmacology, Takeda PharmaceuticalCambridgeMassachusettsUSA
| | | | - Nick Holford
- Department of Pharmacology & Clinical PharmacologyUniversity of AucklandAucklandNew Zealand
| | | | | | | | - Susan Cole
- Medical and Healthcare product Regulatory Agency (MHRA)LondonUK
| | - Essam Kerwash
- Medical and Healthcare product Regulatory Agency (MHRA)LondonUK
| | | | - Chao Liu
- Applied Innovation Quantitative Solutions, BeiGeneWashingtonDCUSA
| | - Yaning Wang
- Createrna Science and TechnologyClarksburgMarylandUSA
| | - Mirjam N. Trame
- Integrated Drug Development Northeast Regional LeadCertaraMassachusettsUSA
| | - Hao Zhu
- Division of Pharmacometrics, Office of Clinical PharmacologyCenter for Drug Evaluation and Research, Food and Drug AdministrationSilver SpringsMarylandUSA
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Lai T, Yeo CY, Rockliff B, Stokes M, Kim HY, Marais BJ, McLachlan AJ, Alffenaar JWC. Therapeutic drug monitoring of liposomal amphotericin B in children. Are we there yet? A systematic review. J Antimicrob Chemother 2024; 79:703-711. [PMID: 38252921 PMCID: PMC10984953 DOI: 10.1093/jac/dkae003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Accepted: 12/22/2023] [Indexed: 01/24/2024] Open
Abstract
INTRODUCTION Therapeutic drug monitoring (TDM) is a tool that supports personalized dosing, but its role for liposomal amphotericin B (L-amb) is unclear. This systematic review assessed the evidence for L-amb TDM in children. OBJECTIVES To evaluate the concentration-efficacy relationship, concentration-toxicity relationship and pharmacokinetic/pharmacodynamic (PK/PD) variability of L-amb in children. METHODS We systematically reviewed PubMed and Embase databases following PRISMA guidelines. Eligible studies included L-amb PK/PD studies in children aged 0-18 years. Review articles, case series of RESULTS In total, 4220 studies were screened; 6 were included, presenting data on 195 children. Invasive candidiasis and aspergillosis were the two most common infections treated with L-amb. Studies showed significant PK variability due to age (mean age ranged from 14 days to 17 years), body weight, non-linear PK and changes in the volume of distribution. Limited evidence supported a peak concentration/MIC (Cmax/MIC) of 25-50 for optimal efficacy and an AUC24 of >600 mg·h/L for nephrotoxicity. L-amb doses of 2.5-10 mg/kg/day were reported to achieve Cmax/MIC > 25 using an MIC of 1 mg/L. CONCLUSIONS While significant PK variability was observed in children, evidence to support routine L-amb TDM was limited. Further studies on efficacy and toxicity benefits are required before routine TDM of L-amb can be recommended.
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Affiliation(s)
- Tony Lai
- Pharmacy Department, The Children’s Hospital at Westmead, Sydney, NSW, Australia
- The University of Sydney Infectious Diseases Institute (Sydney ID), Sydney, NSW, Australia
- Sydney Pharmacy School, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
| | - Chin-Yen Yeo
- Pharmacy Department, Concord Hospital, Sydney, Australia
| | - Bradley Rockliff
- Pharmacy Department, The Children’s Hospital at Westmead, Sydney, NSW, Australia
| | - Michael Stokes
- Pharmacy Department, The Children’s Hospital at Westmead, Sydney, NSW, Australia
- The University of Sydney Infectious Diseases Institute (Sydney ID), Sydney, NSW, Australia
| | - Hannah Yejin Kim
- Sydney Pharmacy School, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
- Pharmacy Department, Westmead Hospital, Sydney, Australia
| | - Ben J Marais
- The University of Sydney Infectious Diseases Institute (Sydney ID), Sydney, NSW, Australia
| | - Andrew J McLachlan
- Sydney Pharmacy School, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
| | - Jan-Willem C Alffenaar
- The University of Sydney Infectious Diseases Institute (Sydney ID), Sydney, NSW, Australia
- Sydney Pharmacy School, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
- Pharmacy Department, Westmead Hospital, Sydney, Australia
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5
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Montepiedra G, Svensson EM, Wong WK, Hooker AC. Optimizing the design of a pharmacokinetic trial to evaluate the dosing scheme of a novel tuberculosis drug in children living with or without HIV. CPT Pharmacometrics Syst Pharmacol 2024; 13:270-280. [PMID: 37946698 PMCID: PMC10864936 DOI: 10.1002/psp4.13077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 09/25/2023] [Accepted: 10/10/2023] [Indexed: 11/12/2023] Open
Abstract
Pharmacokinetic (PK) studies in children are usually small and have ethical constraints due to the medical complexities of drawing blood in this special population. Often, population PK models for the drug(s) of interest are available in adults, and these models can be extended to incorporate the expected deviations seen in children. As a consequence, there is increasing interest in the use of optimal design methodology to design PK sampling schemes in children that maximize information using a small sample size and limited number of sampling times per dosing period. As a case study, we use the novel tuberculosis drug delamanid, and show how applications of optimal design methodology can result in highly efficient and model-robust designs in children for estimating PK parameters using a limited number of sampling measurements. Using developed population PK models based on available data from adults living with and without HIV, and limited data on children without HIV, competing designs for children living with HIV were derived and assessed based on robustness to model uncertainty.
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Affiliation(s)
| | - Elin M. Svensson
- Department of PharmacyRadboud University Medical CenterNijmegenThe Netherlands
- Department of PharmacyUppsala UniversityUppsalaSweden
| | - Weng Kee Wong
- University of California Los AngelesLos AngelesCaliforniaUSA
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6
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Eaton MP, Nadtochiy SM, Stefanos T, Anderson BJ. Dabigatran pharmacokinetic-pharmacodynamic in sheep: Informing dose for anticoagulation during cardiopulmonary bypass. Perfusion 2024:2676591231226291. [PMID: 38171494 DOI: 10.1177/02676591231226291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
BACKGROUND The effect of the anticoagulant, dabigatran, and its antagonist, idarucizumab, on coagulation remains poorly quantified. There are few pharmacokinetic-pharmacodynamic data available to determine dabigatran dose in humans or animals undergoing cardiopulmonary bypass. METHODS Five sheep were given intravenous dabigatran 4 mg/kg. Blood samples were collected for thromboelastometric reaction time (R-time) and drug assay at 5, 15, 30, 60, 120, 240, 480 min, and 24 h. Plasma dabigatran concentrations and R-times were analyzed using an integrated pharmacokinetic-pharmacodynamic model using non-linear mixed effects. The impact of idarucizumab 15 mg/kg administered 120 min after dabigatran 4 mg/kg and its effect on R-time was observed. RESULTS A 2-compartment model described dabigatran pharmacokinetics with a clearance (CL 0.0453 L/min/70 kg), intercompartment clearance (Q 0.268 L/min/70 kg), central volume of distribution (V1 2.94 L/70 kg), peripheral volume of distribution (V2 9.51 L/70 kg). The effect compartment model estimates for a sigmoid EMAX model using Reaction time had an effect site concentration (Ce50 64.2 mg/L) eliciting half of the maximal effect (EMAX 180 min). The plasma-effect compartment equilibration half time (T1/2keo) was 1.04 min. Idarucizumab 15 mg/kg reduced R-time by approximately 5 min. CONCLUSIONS Dabigatran reversibly binds to the active site on the thrombin molecule, preventing activation of coagulation factors. The pharmacologic target concentration strategy uses pharmacokinetic-pharmacodynamic information to inform dose. A loading dose of dabigatran 0.25 mg/kg followed by a maintenance infusion of dabigatran 0.0175 mg/kg/min for 30 min and a subsequent infusion dabigatran 0.0075 mg/kg/min achieves a steady state target concentration of 5 mg/L in a sheep model.
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Affiliation(s)
| | | | | | - Brian J Anderson
- Department Anesthesiology, University of Auckland, Auckland, New Zealand
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7
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Petkova V, Georgieva D, Dimitrov M, Nikolova I. Off-Label Prescribing in Pediatric Population-Literature Review for 2012-2022. Pharmaceutics 2023; 15:2652. [PMID: 38139994 PMCID: PMC10747118 DOI: 10.3390/pharmaceutics15122652] [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: 10/05/2023] [Revised: 11/05/2023] [Accepted: 11/17/2023] [Indexed: 12/24/2023] Open
Abstract
Off-label prescribing is widespread among pediatricians, and it is unlikely that this trend will soon be bound by a uniform legal framework. This is necessitated by the fact that there are four variables: the patient's health condition, the physician's experience and knowledge, the legislative measures (laws, directives, guidelines, and recommendations), and finally, the pharmaceutical industry. There is considerable concern worldwide about the use of off-label medicines in children. We may call it an enormous global problem that is much talked about and written about; however, we should not forget that the goal around which everyone should unite is the patient's life. For healthcare providers, the most important thing will always be the health and preservation of the patient's life, particularly when it comes to children with life-threatening conditions in neonatal and pediatric intensive care units (NICU and PICU). The study aimed to examine the prevalence of off-label drug use in pediatrics. Literature research was conducted, and we included studies from 2012 to 2022 that evaluated off-label drug prevalence in various pediatric patient populations.
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Affiliation(s)
- Valentina Petkova
- Department of Social Pharmacy, Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria
| | - Dilyana Georgieva
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria; (D.G.); (M.D.)
| | - Milen Dimitrov
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria; (D.G.); (M.D.)
| | - Irina Nikolova
- Department of Pharmacology, Pharmacotherapy and Toxicology, Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria;
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Roberts B, Cooper Z, Lu S, Stanley S, Majda BT, Collins KRL, Gilkes L, Rodger J, Akkari PA, Hood SD. Utility of pharmacogenetic testing to optimise antidepressant pharmacotherapy in youth: a narrative literature review. Front Pharmacol 2023; 14:1267294. [PMID: 37795032 PMCID: PMC10545970 DOI: 10.3389/fphar.2023.1267294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Accepted: 08/30/2023] [Indexed: 10/06/2023] Open
Abstract
Pharmacogenetics (PGx) is the study and application of how interindividual differences in our genomes can influence drug responses. By evaluating individuals' genetic variability in genes related to drug metabolism, PGx testing has the capabilities to individualise primary care and build a safer drug prescription model than the current "one-size-fits-all" approach. In particular, the use of PGx testing in psychiatry has shown promising evidence in improving drug efficacy as well as reducing toxicity and adverse drug reactions. Despite randomised controlled trials demonstrating an evidence base for its use, there are still numerous barriers impeding its implementation. This review paper will discuss the management of mental health conditions with PGx-guided treatment with a strong focus on youth mental illness. PGx testing in clinical practice, the concerns for its implementation in youth psychiatry, and some of the barriers inhibiting its integration in clinical healthcare will also be discussed. Overall, this paper provides a comprehensive review of the current state of knowledge and application for PGx in psychiatry and summarises the capabilities of genetic information to personalising medicine for the treatment of mental ill-health in youth.
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Affiliation(s)
- Bradley Roberts
- The Perron Institute for Neurological and Translational Science, Nedlands, WA, Australia
- School of Biological Sciences, University of Western Australia, Crawley, WA, Australia
| | - Zahra Cooper
- The Perron Institute for Neurological and Translational Science, Nedlands, WA, Australia
| | - Stephanie Lu
- School of Psychological Science, University of Western Australia, Crawley, WA, Australia
| | - Susanne Stanley
- Division of Psychiatry, School of Medicine, University of Western Australia, Crawley, WA, Australia
| | | | - Khan R. L. Collins
- Western Australian Department of Health, North Metropolitan Health Service, Perth, WA, Australia
| | - Lucy Gilkes
- School of Medicine, University of Notre Dame, Fremantle, WA, Australia
- Divison of General Practice, School of Medicine, University of Western Australia, Crawley, WA, Australia
| | - Jennifer Rodger
- The Perron Institute for Neurological and Translational Science, Nedlands, WA, Australia
- School of Biological Sciences, University of Western Australia, Crawley, WA, Australia
| | - P. Anthony Akkari
- The Perron Institute for Neurological and Translational Science, Nedlands, WA, Australia
- School of Human Sciences, University of Western Australia, Crawley, WA, Australia
- Centre for Molecular Medicine and Innovative Therapeutics, Murdoch University, Murdoch, WA, Australia
- Division of Neurology, Duke University Medical Centre, Duke University, Durham, United States
| | - Sean D. Hood
- Division of Psychiatry, School of Medicine, University of Western Australia, Crawley, WA, Australia
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van der Veer MAA, de Haan TR, Franken LGW, Hodiamont CJ, Groenendaal F, Dijk PH, de Boode WP, Simons S, Dijkman KP, van Straaten HLM, Rijken M, Cools F, Nuytemans DHGM, van Kaam AH, Bijleveld YA, Mathôt RAA. Population Pharmacokinetics and Dosing Optimization of Ceftazidime in Term Asphyxiated Neonates during Controlled Therapeutic Hypothermia. Antimicrob Agents Chemother 2023; 67:e0170722. [PMID: 37010414 PMCID: PMC10190683 DOI: 10.1128/aac.01707-22] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Accepted: 02/23/2023] [Indexed: 04/04/2023] Open
Abstract
Ceftazidime is an antibiotic commonly used to treat bacterial infections in term neonates undergoing controlled therapeutic hypothermia (TH) for hypoxic-ischemic encephalopathy after perinatal asphyxia. We aimed to describe the population pharmacokinetics (PK) of ceftazidime in asphyxiated neonates during hypothermia, rewarming, and normothermia and propose a population-based rational dosing regimen with optimal PK/pharmacodynamic (PD) target attainment. Data were collected in the PharmaCool prospective observational multicenter study. A population PK model was constructed, and the probability of target attainment (PTA) was assessed during all phases of controlled TH using targets of 100% of the time that the concentration in the blood exceeds the MIC (T>MIC) (for efficacy purposes and 100% T>4×MIC and 100% T>5×MIC to prevent resistance). A total of 35 patients with 338 ceftazidime concentrations were included. An allometrically scaled one-compartment model with postnatal age and body temperature as covariates on clearance was constructed. For a typical patient receiving the current dose of 100 mg/kg of body weight/day in 2 doses and assuming a worst-case MIC of 8 mg/L for Pseudomonas aeruginosa, the PTA was 99.7% for 100% T>MIC during hypothermia (33.7°C; postnatal age [PNA] of 2 days). The PTA decreased to 87.7% for 100% T>MIC during normothermia (36.7°C; PNA of 5 days). Therefore, a dosing regimen of 100 mg/kg/day in 2 doses during hypothermia and rewarming and 150 mg/kg/day in 3 doses during the following normothermic phase is advised. Higher-dosing regimens (150 mg/kg/day in 3 doses during hypothermia and 200 mg/kg/day in 4 doses during normothermia) could be considered when achievements of 100% T>4×MIC and 100% T>5×MIC are desired.
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Affiliation(s)
- Marlotte A. A. van der Veer
- Department of Hospital Pharmacology and Clinical Pharmacology, Amsterdam UMC Location University of Amsterdam, 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 Hospital Pharmacology and Clinical Pharmacology, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands
| | - Caspar J. Hodiamont
- Medical Microbiology, Amsterdam University Medical Center, Amsterdam, The Netherlands
| | - Floris Groenendaal
- Department of Neonatology, Wilhelmina Children’s Hospital, Utrecht, The Netherlands
- Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Peter H. Dijk
- University Medical Center Groningen, Beatrix Children’s Hospital, Department of Pediatrics, Division of Neonatology, 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 Pediatrics, 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, Leiden University Medical Center, Leiden, The Netherlands
| | - 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 Hospital Pharmacology and Clinical Pharmacology, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands
| | - Ron A. A. Mathôt
- Department of Hospital Pharmacology and Clinical Pharmacology, Amsterdam UMC Location University of Amsterdam, Amsterdam, The Netherlands
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10
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Quinney SK, Bies RR, Grannis SJ, Bartlett CW, Mendonca E, Rogerson CM, Backes CH, Shah DK, Tillman EM, Costantine MM, Aruldhas BW, Allam R, Grant A, Abbasi MY, Kandasamy M, Zang Y, Wang L, Shendre A, Li L. The MPRINT Hub Data, Model, Knowledge and Research Coordination Center: Bridging the gap in maternal-pediatric therapeutics research through data integration and pharmacometrics. Pharmacotherapy 2023; 43:391-402. [PMID: 36625779 PMCID: PMC10192201 DOI: 10.1002/phar.2765] [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: 08/15/2022] [Revised: 11/13/2022] [Accepted: 12/08/2022] [Indexed: 01/11/2023]
Abstract
Maternal and pediatric populations have historically been considered "therapeutic orphans" due to their limited inclusion in clinical trials. Physiologic changes during pregnancy and lactation and growth and maturation of children alter pharmacokinetics (PK) and pharmacodynamics (PD) of drugs. Precision therapy in these populations requires knowledge of these effects. Efforts to enhance maternal and pediatric participation in clinical studies have increased over the past few decades. However, studies supporting precision therapeutics in these populations are often small and, in isolation, may have limited impact. Integration of data from various studies, for example through physiologically based pharmacokinetic/pharmacodynamic (PBPK/PD) modeling or bioinformatics approaches, can augment the value of data from these studies, and help identify gaps in understanding. To catalyze research in maternal and pediatric precision therapeutics, the Obstetric and Pediatric Pharmacology and Therapeutics Branch of the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) established the Maternal and Pediatric Precision in Therapeutics (MPRINT) Hub. Herein, we provide an overview of the status of maternal-pediatric therapeutics research and introduce the Indiana University-Ohio State University MPRINT Hub Data, Model, Knowledge and Research Coordination Center (DMKRCC), which aims to facilitate research in maternal and pediatric precision therapeutics through the integration and assessment of existing knowledge, supporting pharmacometrics and clinical trials design, development of new real-world evidence resources, educational initiatives, and building collaborations among public and private partners, including other NICHD-funded networks. By fostering use of existing data and resources, the DMKRCC will identify critical gaps in knowledge and support efforts to overcome these gaps to enhance maternal-pediatric precision therapeutics.
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Affiliation(s)
- Sara K Quinney
- Department of Obstetrics and Gynecology, Indiana University School of Medicine, Indiana University, Indianapolis, Indiana, USA
- Division of Clinical Pharmacology, Department of Medicine, Indiana University School of Medicine, Indiana University, Indianapolis, Indiana, USA
- Center for Computational Biology and Bioinformatics, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Robert R Bies
- Department of Pharmaceutical Sciences, University at Buffalo School of Pharmacy and Pharmaceutical Sciences, State University of New York at Buffalo, Buffalo, New York, USA
- Institute for Computational and Data Sciences, University at Buffalo, State University of New York at Buffalo, Buffalo, New York, USA
| | - Shaun J Grannis
- Department of Family Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA
- Center for Biomedical Informatics, Regenstrief Institute, Indianapolis, Indiana, USA
- Richard M. Fairbanks School of Public Health, Indiana University, Indianapolis, Indiana, USA
| | - Christopher W Bartlett
- The Steve & Cindy Rasmussen Institute for Genomic Medicine, Battelle Center for Computational Biology, Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, Ohio, USA
- Department of Pediatrics, College of Medicine, The Ohio State University, Columbus, Ohio, USA
| | - Eneida Mendonca
- Department of Pediatrics, Indiana University School of Medicine, Indianapolis, Indiana, USA
- Department Biostatistics and Health Data Sciences, Indiana University School of Medicine, Indianapolis, Indiana, USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
- Division of Biomedical Informatics, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
| | - Colin M Rogerson
- Department of Pediatrics, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Carl H Backes
- Division of Neonatology, Nationwide Children’s Hospital; Departments of Pediatrics and Obstetrics and Gynecology, The Ohio State University College of Medicine; Center for Perinatal Research and The Ohio Perinatal Research Network, The Abigail Wexner Research Institute at Nationwide Children’s Hospital, USA; The Heart Center at Nationwide Children’s Hospital, Columbus, Ohio, USA
| | - Dhaval K Shah
- Department of Pharmaceutical Sciences, University at Buffalo School of Pharmacy and Pharmaceutical Sciences, State University of New York at Buffalo, Buffalo, New York, USA
| | - Emma M Tillman
- Division of Clinical Pharmacology, Department of Medicine, Indiana University School of Medicine, Indiana University, Indianapolis, Indiana, USA
| | - Maged M Costantine
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, The Ohio State University, Columbus, Ohio, USA
| | - Blessed W Aruldhas
- Division of Clinical Pharmacology, Department of Medicine, Indiana University School of Medicine, Indiana University, Indianapolis, Indiana, USA
- Department of Pharmacology and Clinical Pharmacology, Christian Medical College, Vellore, India
| | - Reva Allam
- Division of Clinical Pharmacology, Department of Medicine, Indiana University School of Medicine, Indiana University, Indianapolis, Indiana, USA
| | - Amelia Grant
- Division of Clinical Pharmacology, Department of Medicine, Indiana University School of Medicine, Indiana University, Indianapolis, Indiana, USA
| | - Mohammed Yaseen Abbasi
- Division of Clinical Pharmacology, Department of Medicine, Indiana University School of Medicine, Indiana University, Indianapolis, Indiana, USA
| | - Murugesh Kandasamy
- Division of Clinical Pharmacology, Department of Medicine, Indiana University School of Medicine, Indiana University, Indianapolis, Indiana, USA
| | - Yong Zang
- Center for Computational Biology and Bioinformatics, Indiana University School of Medicine, Indianapolis, Indiana, USA
- Department Biostatistics and Health Data Sciences, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Lei Wang
- Department of Biomedical Informatics, College of Medicine, The Ohio State University, Columbus, Ohio, USA
| | - Aditi Shendre
- Department of Biomedical Informatics, College of Medicine, The Ohio State University, Columbus, Ohio, USA
| | - Lang Li
- Department of Biomedical Informatics, College of Medicine, The Ohio State University, Columbus, Ohio, USA
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11
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Wright K, Craske J, Gill A, Jenson J, Arnold P. Evaluation of age-banded dosing of oral paracetamol in hospitalised children: a retrospective analysis using clinical data in a tertiary paediatric hospital. Arch Dis Child 2023:archdischild-2022-325267. [PMID: 37185173 DOI: 10.1136/archdischild-2022-325267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Accepted: 03/29/2023] [Indexed: 05/17/2023]
Abstract
OBJECTIVE To evaluate age-banded dosing in paediatric inpatients by determining the proportion of patients whose dose would fall outside the therapeutic range (by weight). DESIGN A retrospective observational study. Weight and height measurements and details of hospital admissions were matched from the electronic patient record of a single, tertiary paediatric hospital. Dosage which would be given according to age-banded dosing was then compared with their weight. PARTICIPANTS All children admitted to a single tertiary children's hospital aged 3 months to 16 years over a 5-year period. Data were cleaned to remove values likely to be erroneous and filtered to reduce bias due to patients who were admitted on multiple occasions. OUTCOMES The main outcome was the proportion of patients who would receive a subtherapeutic or supratherapeutic paracetamol dose if given a dose based on their age. Secondary outcomes were to examine this in children of different ages and to examine the impact of alternative size-based dosing strategies. RESULTS 100 047 admissions (in 68 310 patients) had a weight documented. If age-banded dosing had been used, a subtherapeutic dose (less than 10 mg/kg) would be given during 19 829 (20%) of the admissions and a supratherapeutic dose (over 18.75 mg/kg, 75 mg/kg/day in four doses) in 4289 (4.3%). The highest risk of a subtherapeutic dose occurred in infants just prior to reaching 6 months of age (83%) and in children just prior to reaching 8 years (66%). The highest risk of a supratherapeutic dose was at 12 years of age (35%). CONCLUSION Age-banded dosing is not suitable for an inpatient paediatric population as approximately a quarter of patients receive a dose outside the recommended range of 10.0-18.75 mg/kg.
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Affiliation(s)
- Kirstie Wright
- Acute Medicine, Harrogate District Hospital, Harrogate, UK
| | - Jennie Craske
- Pain Service, Department of Anaesthesia, Alder Hey Children's NHS Foundation Trust, Liverpool, UK
| | - Andrea Gill
- School of Pharmacy and Biomolecular Sciences, Alder Hey Children's NHS Foundation Trust, Liverpool, UK
| | - John Jenson
- Business Intelligence, Alder Hey Children's NHS Foundation Trust, Liverpool, UK
| | - Philip Arnold
- Anesthesia, Alder Hey Children's NHS Foundation Trust, Liverpool, UK
- Faculty of Medicine and Life Sciences, University of Liverpool, Liverpool, Merseyside, UK
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12
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Anderson BJ, Cortinez LI. Perioperative Acetaminophen Dosing in Obese Children. CHILDREN 2023; 10:children10040625. [PMID: 37189874 DOI: 10.3390/children10040625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Revised: 03/14/2023] [Accepted: 03/23/2023] [Indexed: 03/29/2023]
Abstract
Acetaminophen is a commonly used perioperative analgesic drug in children. The use of a preoperative loading dose achieves a target concentration of 10 mg/L associated with a target analgesic effect that is 2.6 pain units (visual analogue scale 1–10). Postoperative maintenance dosing is used to keep this effect at a steady-state concentration. The loading dose in children is commonly prescribed per kilogram. That dose is consistent with the linear relationship between the volume of distribution and total body weight. Total body weight is made up of both fat and fat-free mass. The fat mass has little influence on the volume of distribution of acetaminophen but fat mass should be considered for maintenance dosing that is determined by clearance. The relationship between the pharmacokinetic parameter, clearance, and size is not linear. A number of size metrics (e.g., fat-free and normal fat mass, ideal body weight and lean body weight) have been proposed to scale clearance and all consequent dosing schedules recognize curvilinear relationships between clearance and size. This relationship can be described using allometric theory. Fat mass also has an indirect influence on clearance that is independent of its effects due to increased body mass. Normal fat mass, used in conjunction with allometry, has proven a useful size metric for acetaminophen; it is calculated using fat-free mass and a fraction (Ffat) of the additional mass contributing to total body weight. However, the Ffat for acetaminophen is large (Ffat = 0.82), pharmacokinetic and pharmacodynamic parameter variability high, and the concentration–response slope gentle at the target concentration. Consequently, total body weight with allometry is acceptable for the calculation of maintenance dose. The dose of acetaminophen is tempered by concerns about adverse effects, notably hepatotoxicity associated with use after 2–3 days at doses greater than 90 mg/kg/day.
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13
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Sherwin CM, Tran NK, Sullivan K, Wead S, Birnbaum AK, Avachat C, Healy DP, Kagan RJ. Exploring the Past to Inform the Future to Optimize the Pharmacokinetics of Vancomycin in Children With Severe Burn Injuries. J Burn Care Res 2023; 44:353-362. [PMID: 36194537 DOI: 10.1093/jbcr/irac147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Indexed: 11/12/2022]
Abstract
Sepsis remains one of the leading causes of death among pediatric patients with burn injuries. Despite limited vancomycin pharmacokinetic (PK) information within this population, it is widely used to treat severe burn injuries. Those with severe burns are at risk of nephrotoxicity, with an incidence of acute kidney injury (AKI) over 50%. Delivering an effective vancomycin dose and avoiding unnecessary toxicity is essential for improved patient outcomes. This was a retrospective analysis of 115 children aged 0.2 months to 18 years with severe burns, >10% total body surface area. Vancomycin was given via intravenous infusion; blood samples were drawn between 6- and 12-hour postinfusion. A population pharmacokinetic model was developed using nonlinear mixed-effect modeling (Monolix, version 2016R1). A one-compartment model described a steady-state volume of distribution (V), dependent on weight. Vancomycin clearance (CL) was influenced by age and estimated creatinine clearance (CrCL). The study population's (median age = 4 years, median weight = 20 kg, median total body surface area (%TBSA) = 40%) median V and CL were calculated to be 1.25 L/kg (95% CI, 1.04-1.46) and 0.15 L/h/kg (95% CI, 0.126-0.165), respectively. The PK model was explicitly developed to characterize the impact of physiological changes in children under 18 years of age and the percentage of the burn surface area using limited data. The analysis determined that weight, age, and estimated CrCL were important covariates in predicting vancomycin PK with high variability in CL and V.
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Affiliation(s)
- Catherine M Sherwin
- Dept of Pediatrics, Boonshoft School of Medicine, Wright State University, Dayton, OH, USA.,Dayton Children's Hospital, Dayton, OhH, USA.,James L. Winkle College of Pharmacy, University of Cincinnati, Cincinnati, OH, USA.,Department of Experimental and Clinical Pharmacology, College of Pharmacy, University of Minnesota, Minneapolis, MN, USA
| | - Nam K Tran
- Department of Pathology and Laboratory Medicine, University of California, School of Medicine, Davis, CA, USA
| | - Kevin Sullivan
- University of Tennessee Medical Center and College of Pharmacy, Knoxville, TN, USA
| | | | - Angela K Birnbaum
- Department of Experimental and Clinical Pharmacology, College of Pharmacy, University of Minnesota, Minneapolis, MN, USA
| | - Charul Avachat
- Department of Experimental and Clinical Pharmacology, College of Pharmacy, University of Minnesota, Minneapolis, MN, USA
| | - Daniel P Healy
- James L. Winkle College of Pharmacy, University of Cincinnati, Cincinnati, OH, USA
| | - Richard J Kagan
- The Shriners Hospitals for Children®, Dayton (Cincinnati), OH, USA.,Department of Surgery, University of Cincinnati College of Medicine, Cincinnati, OH, USA
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14
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Morse JD, Cortinez LI, Anderson BJ. Considerations for Intravenous Anesthesia Dose in Obese Children: Understanding PKPD. J Clin Med 2023; 12:jcm12041642. [PMID: 36836174 PMCID: PMC9960599 DOI: 10.3390/jcm12041642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 02/09/2023] [Accepted: 02/16/2023] [Indexed: 02/22/2023] Open
Abstract
The intravenous induction or loading dose in children is commonly prescribed per kilogram. That dose recognizes the linear relationship between volume of distribution and total body weight. Total body weight comprises both fat and fat-free mass. Fat mass influences the volume of distribution and the use of total body weight fails to recognize the impact of fat mass on pharmacokinetics in children. Size metrics alternative to total body mass (e.g., fat-free and normal fat mass, ideal body weight and lean body weight) have been proposed to scale pharmacokinetic parameters (clearance, volume of distribution) for size. Clearance is the key parameter used to calculate infusion rates or maintenance dosing at steady state. Dosing schedules recognize the curvilinear relationship, described using allometric theory, between clearance and size. Fat mass also has an indirect influence on clearance through both metabolic and renal function that is independent of its effects due to increased body mass. Fat-free mass, lean body mass and ideal body mass are not drug specific and fail to recognize the variable impact of fat mass contributing to body composition in children, both lean and obese. Normal fat mass, used in conjunction with allometry, may prove a useful size metric but computation by clinicians for the individual child is not facile. Dosing is further complicated by the need for multicompartment models to describe intravenous drug pharmacokinetics and the concentration effect relationship, both beneficial and adverse, is often poorly understood. Obesity is also associated with other morbidity that may also influence pharmacokinetics. Dose is best determined using pharmacokinetic-pharmacodynamic (PKPD) models that account for these varied factors. These models, along with covariates (age, weight, body composition), can be incorporated into programmable target-controlled infusion pumps. The use of target-controlled infusion pumps, assuming practitioners have a sound understanding of the PKPD within programs, provide the best available guide to intravenous dose in obese children.
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Affiliation(s)
- James Denzil Morse
- Department of Anaesthesiology, University of Auckland, Park Road, Auckland 1023, New Zealand
| | - Luis Ignacio Cortinez
- División Anestesiología, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago 8331150, Chile
| | - Brian Joseph Anderson
- Department of Anaesthesiology, University of Auckland, Park Road, Auckland 1023, New Zealand
- Department of Anaesthesia, Auckland Children’s Hospital, Park Road, Private Bag 92024, Auckland 1023, New Zealand
- Correspondence: ; Tel.:+64-9-3074903; Fax: +64-9-3078986
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15
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Buyssens L, Valenzuela A, Prims S, Ayuso M, Thymann T, Van Ginneken C, Van Cruchten S. Ontogeny of CYP3A and UGT activity in preterm piglets: a translational model for drug metabolism in preterm newborns. Front Pharmacol 2023; 14:1177541. [PMID: 37124224 PMCID: PMC10133700 DOI: 10.3389/fphar.2023.1177541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 04/04/2023] [Indexed: 05/02/2023] Open
Abstract
Despite considerable progress in understanding drug metabolism in the human pediatric population, data remains scarce in preterm neonates. Improving our knowledge of the ADME properties in this vulnerable age group is of utmost importance to avoid suboptimal dosing, which may lead to adverse drug reactions. The juvenile (mini)pig is a representative model for hepatic drug metabolism in human neonates and infants, especially phase I reactions. However, the effect of prematurity on the onset of hepatic phase I and phase II enzyme activity has yet to be investigated in this animal model. Therefore, the aim of this study was to assess the ontogeny of CYP3A and UGT enzyme activity in the liver of preterm (gestational day 105-107) and term-born (gestational day 115-117) domestic piglets. In addition, the ontogeny pattern between the preterm and term group was compared to examine whether postconceptional or postnatal age affects the onset of enzyme activity. The following age groups were included: preterm postnatal day (PND) 0 (n = 10), PND 5 (n = 10), PND 11 (n = 8), PND 26 (n = 10) and term PND 0 (n = 10), PND 5 (n = 10), PND 11 (n = 8), PND 19 (n = 18) and PND 26 (n = 10). Liver microsomes were extracted, and the metabolism of CYP3A and UGT-specific substrates assessed enzyme activity. Preterm CYP3A activity was only detectable at PND 26, whereas term CYP3A activity showed a gradual postnatal increase from PND 11 onwards. UGT activity gradually increased between PND 0 and PND 26 in preterm and term-born piglets, albeit, being systematically lower in the preterm group. Thus, postconceptional age is suggested as the main driver affecting porcine CYP3A and UGT enzyme ontogeny. These data are a valuable step forward in the characterization of the preterm piglet as a translational model for hepatic drug metabolism in the preterm human neonate.
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Affiliation(s)
- Laura Buyssens
- Comparative Perinatal Development, Department of Veterinary Sciences, Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, Wilrijk, Belgium
| | - Allan Valenzuela
- Comparative Perinatal Development, Department of Veterinary Sciences, Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, Wilrijk, Belgium
| | - Sara Prims
- Comparative Perinatal Development, Department of Veterinary Sciences, Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, Wilrijk, Belgium
| | - Miriam Ayuso
- Comparative Perinatal Development, Department of Veterinary Sciences, Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, Wilrijk, Belgium
| | - Thomas Thymann
- Comparative Pediatrics and Nutrition, Department of Veterinary and Animal Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Chris Van Ginneken
- Comparative Perinatal Development, Department of Veterinary Sciences, Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, Wilrijk, Belgium
| | - Steven Van Cruchten
- Comparative Perinatal Development, Department of Veterinary Sciences, Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, Wilrijk, Belgium
- *Correspondence: Steven Van Cruchten,
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16
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Green EA, Metz D, Galinsky R, Atkinson R, Skuza EM, Clark M, Gunn AJ, Kirkpatrick CM, Hunt RW, Berger PJ, Nold-Petry CA, Nold MF. Anakinra Pilot - a clinical trial to demonstrate safety, feasibility and pharmacokinetics of interleukin 1 receptor antagonist in preterm infants. Front Immunol 2022; 13:1022104. [PMID: 36389766 PMCID: PMC9647081 DOI: 10.3389/fimmu.2022.1022104] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 10/10/2022] [Indexed: 09/29/2023] Open
Abstract
BACKGROUND Bronchopulmonary dysplasia (BPD), its complication pulmonary hypertension (BPD-PH) and preterm brain and gut injury lead to significant morbidity and mortality in infants born extremely prematurely. There is extensive evidence that the pro-inflammatory cytokine interleukin 1 (IL-1) plays a key role in the pathophysiology of these illnesses. Two decades of clinical use in paediatric and adult medicine have established an excellent safety and efficacy record for IL-1 blockade with IL-1 receptor antagonist (IL-1Ra, medication name anakinra). Building on robust pre-clinical evidence, the Anakinra Pilot trial aims to demonstrate safety and feasibility of administering anakinra to preterm infants, and to establish pharmacokinetics in this population. Its ultimate goal is to facilitate large studies that will test whether anakinra can ameliorate early-life inflammation, thus alleviating multiple complications of prematurity. METHODS AND ANALYSIS Anakinra Pilot is an investigator-initiated, single arm, safety and feasibility dose-escalation trial in extremely preterm infants born between 24 weeks 0 days (240) and 276 weeks of gestational age (GA). Enrolled infants will receive anakinra intravenously over the first 21 days after birth, starting in the first 24 h after birth. In the first phase, dosing is 1 mg/kg every 48 h, and dosage will increase to 1.5 mg/kg every 24 h in the second phase. Initial anakinra dosing was determined through population pharmacokinetic model simulations. During the study, there will be a interim analysis to confirm predictions before undertaking dose assessment. Anakinra therapy will be considered safe if the frequency of adverse outcomes/events does not exceed that expected in infants born at 240-276 weeks GA. CLINICAL TRIAL REGISTRATION https://clinicaltrials.gov/, identifier NCT05280340.
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Affiliation(s)
- Elys A. Green
- Department of Paediatrics, Monash University, Melbourne, VIC, Australia
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Monash Newborn, Monash Children’s Hospital, Melbourne, VIC, Australia
| | - David Metz
- Department of Paediatrics, Monash University, Melbourne, VIC, Australia
- Monash Children’s Hospital, Melbourne, VIC, Australia
- Murdoch Children’s Research Institute, Melbourne, VIC, Australia
| | - Robert Galinsky
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
| | - Rebecka Atkinson
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Monash Newborn, Monash Children’s Hospital, Melbourne, VIC, Australia
| | - Elizbeth M. Skuza
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
| | - Megan Clark
- Monash Newborn, Monash Children’s Hospital, Melbourne, VIC, Australia
- Faculty of Pharmacy and Pharmaceutical Science, Monash University, Melbourne, VIC, Australia
| | - Alistair J Gunn
- Department of Physiology, The University of Auckland, Auckland, New Zealand
| | - Carl M. Kirkpatrick
- Monash Institute for Pharmaceutical Sciences, Monash University, Melbourne, VIC, Australia
| | - Rod W. Hunt
- Department of Paediatrics, Monash University, Melbourne, VIC, Australia
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Monash Newborn, Monash Children’s Hospital, Melbourne, VIC, Australia
| | - Philip J. Berger
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
| | - Claudia A. Nold-Petry
- Department of Paediatrics, Monash University, Melbourne, VIC, Australia
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
| | - Marcel F. Nold
- Department of Paediatrics, Monash University, Melbourne, VIC, Australia
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Monash Newborn, Monash Children’s Hospital, Melbourne, VIC, Australia
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17
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Leeder JS, Gaedigk A, Wright KJ, Staggs VS, Soden SE, Lin YS, Pearce RE. A longitudinal study of cytochrome P450 2D6 (CYP2D6) activity during adolescence. Clin Transl Sci 2022; 15:2514-2527. [PMID: 35997001 PMCID: PMC9579386 DOI: 10.1111/cts.13380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 07/07/2022] [Accepted: 07/09/2022] [Indexed: 01/25/2023] Open
Abstract
CYP2D6 substrates are among the most highly prescribed medications in teenagers and also commonly associated with serious adverse events. To investigate the relative contributions of genetic variation, growth, and development on CYP2D6 activity during puberty, healthy children and adolescents 7-15 years of age at enrollment participated in a longitudinal phenotyping study involving administration of 0.3 mg/kg dextromethorphan (DM) and 4-h urine collection every 6 months for 3 years (7 total visits). At each visit, height, weight, and sexual maturity were recorded, and CYP2D6 activity was determined as the urinary molar ratio of DM to its metabolite dextrorphan (DX). A total of 188 participants completed at least one visit, and 102 completed all seven study visits. Following univariate analysis, only CYP2D6 activity score (p < 0.001), urinary pH (p < 0.001), weight (p = 0.018), and attention-deficit/hyperactivity disorder (ADHD) diagnosis (p < 0.001) were significantly correlated with log(DM/DX). Results of linear mixed model analysis with random intercept, random slope covariance structure revealed that CYP2D6 activity score had the strongest effect on log(DM/DX), with model-estimated average log(DM/DX) being 3.8 SDs higher for poor metabolizers than for patients with activity score 3. A moderate effect on log(DM/DX) was observed for sex, and smaller effects were observed for ADHD diagnosis and urinary pH. The log(DM/DX) did not change meaningfully with age or pubertal development. CYP2D6 genotype remains the single, largest determinant of variability in CYP2D6 activity during puberty. Incorporation of genotype-based dosing guidelines should be considered for CYP2D6 substrates given the prevalent use of these agents in this pediatric age group.
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Affiliation(s)
- J. Steven Leeder
- Division of Clinical Pharmacology, Toxicology and Therapeutic Innovation, Department of PediatricsChildren's Mercy Kansas CityKansas CityMissouriUSA,School of MedicineUniversity of Missouri‐Kansas CityKansas CityMissouriUSA
| | - Andrea Gaedigk
- Division of Clinical Pharmacology, Toxicology and Therapeutic Innovation, Department of PediatricsChildren's Mercy Kansas CityKansas CityMissouriUSA,School of MedicineUniversity of Missouri‐Kansas CityKansas CityMissouriUSA
| | - Krista J. Wright
- Division of Clinical Pharmacology, Toxicology and Therapeutic Innovation, Department of PediatricsChildren's Mercy Kansas CityKansas CityMissouriUSA
| | - Vincent S. Staggs
- School of MedicineUniversity of Missouri‐Kansas CityKansas CityMissouriUSA,Biostatistics & Epidemiology Core, Division of Health Services and Outcomes Research, Department of PediatricsChildren's Mercy Kansas CityKansas CityMissouriUSA,Division of Developmental and Behavioral Sciences, Department of PediatricsChildren's Mercy Kansas CityKansas CityMissouriUSA
| | - Sarah E. Soden
- Division of Clinical Pharmacology, Toxicology and Therapeutic Innovation, Department of PediatricsChildren's Mercy Kansas CityKansas CityMissouriUSA,School of MedicineUniversity of Missouri‐Kansas CityKansas CityMissouriUSA
| | - Yvonne S. Lin
- Department of PharmaceuticsUniversity of WashingtonSeattleWashingtonUSA
| | - Robin E. Pearce
- Division of Clinical Pharmacology, Toxicology and Therapeutic Innovation, Department of PediatricsChildren's Mercy Kansas CityKansas CityMissouriUSA,School of MedicineUniversity of Missouri‐Kansas CityKansas CityMissouriUSA
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18
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Schmitt G, Barrow P. Considerations for and against dosing rodent pups before 7 days of age in juvenile toxicology studies. Reprod Toxicol 2022; 112:77-87. [PMID: 35772686 DOI: 10.1016/j.reprotox.2022.06.010] [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: 02/17/2022] [Revised: 06/21/2022] [Accepted: 06/22/2022] [Indexed: 10/17/2022]
Abstract
This review focuses on preweaning ontogenic and developmental processes that can influence the selection of the appropriate age at which to start dosing rodent pups in juvenile animal studies (JAS). The ICH S11 guideline on 'Nonclinical Safety Testing in Support of Development of Paediatric Medicines' highlights the need to adapt the age from which animals are dosed according to the stage of development in the target organs/tissues of concern in the youngest pediatric patients. Rodents (rat or mouse) are the most common species for JAS. Despite previous practices, based on comparative ontogeny, it is rarely necessary to dose rodents younger than one week of age since postnatal day (PND)7 is appropriate to address concern for the vast majority of organs. In exceptional cases, earlier dosing (e.g., PND4) can be appropriate to address specific concern in preterm neonates and when a tissue of concern has a particularly early developmental trajectory in the rodent compared to humans. The comparative development of the CNS is particularly complex. While exposure of rodents from PND10 covers most CNS development stages relevant to human neonates, a later dosing start (yet, not later than PND14) can sometimes be appropriate to reflect specific aspects (e.g., transformation of GABAergic transmission). An extended study design including subsets of several ages can be helpful to address multiple concerns within a preweaning JAS. Such design can allow for individual assessment of each concern, whilst minimizing (potentially irrelevant) signals from tissues exposed at a developmental stage that do not match the human situation.
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Affiliation(s)
- Georg Schmitt
- Roche Pharmaceutical Research and Early Development, Pharmaceutical Sciences, Roche Innovation Center Basel, F. Hoffmann-La Roche Ltd., Grenzacherstrasse 124, CH 4070 Basel, Switzerland.
| | - Paul Barrow
- Roche Pharmaceutical Research and Early Development, Pharmaceutical Sciences, Roche Innovation Center Basel, F. Hoffmann-La Roche Ltd., Grenzacherstrasse 124, CH 4070 Basel, Switzerland
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19
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Morse JD, Cortinez LI, Anderson BJ. Pharmacokinetic Pharmacodynamic Modelling Contributions to Improve Paediatric Anaesthesia Practice. J Clin Med 2022; 11:jcm11113009. [PMID: 35683399 PMCID: PMC9181587 DOI: 10.3390/jcm11113009] [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: 04/26/2022] [Revised: 05/24/2022] [Accepted: 05/25/2022] [Indexed: 12/10/2022] Open
Abstract
The use of pharmacokinetic-pharmacodynamic models has improved anaesthesia practice in children through a better understanding of dose-concentration-response relationships, developmental pharmacokinetic changes, quantification of drug interactions and insights into how covariates (e.g., age, size, organ dysfunction, pharmacogenomics) impact drug prescription. Simulation using information from these models has enabled the prediction and learning of beneficial and adverse effects and decision-making around clinical scenarios. Covariate information, including the use of allometric size scaling, age and consideration of fat mass, has reduced population parameter variability. The target concentration approach has rationalised dose calculation. Paediatric pharmacokinetic-pharmacodynamic insights have led to better drug delivery systems for total intravenous anaesthesia and an expectation about drug offset when delivery is stopped. Understanding concentration-dependent adverse effects have tempered dose regimens. Quantification of drug interactions has improved the understanding of the effects of drug combinations. Repurposed drugs (e.g., antiviral drugs used for COVID-19) within the community can have important effects on drugs used in paediatric anaesthesia, and the use of simulation educates about these drug vagaries.
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Affiliation(s)
- James D. Morse
- Department of Anaesthesiology, University of Auckland, Park Road, Auckland 1023, New Zealand;
| | - Luis Ignacio Cortinez
- División Anestesiología, Escuela de Medicina, Pontificia Universidad Católica de Chile, San Diego de Chile 8331150, Chile;
| | - Brian J. Anderson
- Department of Anaesthesiology, University of Auckland, Park Road, Auckland 1023, New Zealand;
- Correspondence: ; Tel.: +64-9-3074903; Fax: +64-9-3078986
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20
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Hu TM. A General Biphasic Bodyweight Model for Scaling Basal Metabolic Rate, Glomerular Filtration Rate, and Drug Clearance from Birth to Adulthood. AAPS J 2022; 24:67. [PMID: 35538161 DOI: 10.1208/s12248-022-00716-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 04/26/2022] [Indexed: 02/06/2023] Open
Abstract
The objective of this study is to propose a unified, continuous, and bodyweight-only equation to quantify the changes of human basal metabolic rate (BMR), glomerular filtration rate (GFR), and drug clearance (CL) from infancy to adulthood. The BMR datasets were retrieved from a comprehensive historical database of male and female subjects (0.02 to 64 years). The CL datasets for 17 drugs and the GFR dataset were generated from published maturation and growth models with reported parameter values. A statistical approach was used to simulate the model-generated CL and GFR data for a hypothetical population with 26 age groups (from 0 to 20 years). A biphasic equation with two power-law functions of bodyweight was proposed and evaluated as a general model using nonlinear regression and dimensionless analysis. All datasets universally reveal biphasic curves with two distinct linear segments on log-log plots. The biphasic equation consists of two reciprocal allometric terms that asymptotically determine the overall curvature. The fitting results show a superlinear scaling phase (asymptotic exponent >1; ca. 1.5-3.5) and a sublinear scaling phase (asymptotic exponent <1; ca. 0.5-0.7), which are separated at the phase transition bodyweight ranging from 5 to 20 kg with a mean value of 10 kg (corresponding to 1 year of age). The dimensionless analysis generalizes and offers quantitative realization of the maturation and growth process. In conclusion, the proposed mixed-allometry equation is a generic model that quantitatively describes the phase transition in the human maturation process of diverse human functions.
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Affiliation(s)
- Teh-Min Hu
- Department of Pharmacy, School of Pharmaceutical Sciences, National Yang Ming Chiao Tung University, Taipei, 112, Taiwan.
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21
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Perlstein I, Merenlender Wagner A, Gomeni R, Lamson M, Harary E, Spiegelstein O, Kalmanczhelyi A, Tiver R, Loupe P, Levi M, Elgart A. Population Pharmacokinetic Modeling and Simulation of TV-46000: A Long-Acting Injectable Formulation of Risperidone. Clin Pharmacol Drug Dev 2022; 11:865-877. [PMID: 35245409 PMCID: PMC9315033 DOI: 10.1002/cpdd.1078] [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: 11/04/2021] [Accepted: 12/29/2021] [Indexed: 12/05/2022]
Abstract
TV‐46000 is a long‐acting subcutaneous antipsychotic that uses a novel copolymer drug delivery technology in combination with a well‐characterized molecule, risperidone, that is in clinical development as a treatment for schizophrenia. A population pharmacokinetic (PPK) modeling and simulation approach was implemented to identify TV‐46000 doses and dosing schedules for clinical development that would provide the best balance between clinical efficacy and safety. The PPK model was created by applying pharmacokinetic data from a phase 1 study of 97 patients with a diagnosis of schizophrenia or schizoaffective disorder who received either single or repeated doses of TV‐46000. The PPK model was used to characterize the complex release profile of the total active moiety (TAM; the sum of the risperidone and 9‐OH risperidone concentrations) concentration following subcutaneous injections of TV‐46000. The PK profile was best described by a double Weibull function of the in vivo release rate and by a 2‐compartment disposition and elimination model. Simulations were performed to determine TV‐46000 doses and dosing schedules that maintained a median profile of TAM concentrations similar to published TAM exposure following oral risperidone doses that have been correlated to a 40% to 80% dopamine‐D2 receptor occupancy therapeutic window. The simulations showed that therapeutic dose ranges for TV‐46000 are 50 to 125 mg for once‐monthly and 100 to 250 mg for the once every 2 months regimens. This PPK model provided a basis for prediction of patient‐specific exposure and dopamine‐D2 receptor occupancy estimates to support further clinical development and dose selection for the phase 3 studies.
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Affiliation(s)
- Itay Perlstein
- Magic Wand Research LLC, Philadelphia, Pennsylvania, USA
| | | | | | | | - Eran Harary
- Teva Branded Pharmaceutical Products Inc. Research and Development, Netanya, Israel
| | - Ofer Spiegelstein
- Teva Branded Pharmaceutical Products Inc. Research and Development, Netanya, Israel
| | | | - Ryan Tiver
- Teva Branded Pharmaceutical Products Inc., West Chester, Pennsylvania, USA
| | - Pippa Loupe
- Teva Branded Pharmaceutical Products Inc., West Chester, Pennsylvania, USA
| | - Micha Levi
- Formerly Teva Branded Pharmaceutical Products, currently Bill & Melinda Gates Medical Research Institute, Cambridge, MA, USA
| | - Anna Elgart
- Teva Branded Pharmaceutical Products Inc. Research and Development, Netanya, Israel
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22
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Population Pharmacokinetics of Moxifloxacin in Children. Paediatr Drugs 2022; 24:163-173. [PMID: 35284983 PMCID: PMC9768852 DOI: 10.1007/s40272-022-00493-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 01/10/2022] [Indexed: 10/18/2022]
Abstract
BACKGROUND/OBJECTIVE Moxifloxacin is a fluoroquinolone that is commonly used in adults, but not children. Certain clinical situations compel pediatric clinicians to use moxifloxacin, despite its potential for toxicity and limited pharmacokinetics (PK) data. Our objective was to further characterize the pharmacokinetics of moxifloxacin in children. METHODS We performed an opportunistic, open-label population PK study of moxifloxacin in children < 18 years of age who received moxifloxacin as part of standard care. A set of structural PK models and residual error models were explored using nonlinear mixed-effects modeling. Covariates with known biological relationships were investigated for their influence on PK parameters. RESULTS We obtained 43 moxifloxacin concentrations from 14 participants who received moxifloxacin intravenously (n = 8) or orally (n = 6). The dose of moxifloxacin was 10 mg/kg daily in participants ≤ 40 kg and 400 mg daily in participants > 40 kg. The population mean clearance and mean volume of distribution were 18.2 L/h and 167 L, respectively. The oral absorption was described by a first-order process. The estimated extent of oral bioavailability was highly variable (range 20-91%). Total body weight was identified as a covariate on clearance and volume of distribution, and substantially reduced the random unexplained inter-individual variability for both parameters. No participants experienced suspected serious adverse reactions related to moxifloxacin. CONCLUSION These data add to the existing literature to support use of moxifloxacin in children in certain situations; however, further prospective studies on the safety and efficacy of moxifloxacin are needed.
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23
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Rosen DM, Alcock MM, Palmer GM. Opioids for acute pain management in children. Anaesth Intensive Care 2022; 50:81-94. [PMID: 35172638 DOI: 10.1177/0310057x211065769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Opioids are integral to multimodal analgesic regimens in children with moderate to severe acute pain. Throughout normal childhood there are marked changes in physiology, and social and psychological development that influence the perception and expression of pain, the pharmacology of opioids, and how they are used. A multidimensional pain assessment is key to guiding appropriate opioid prescribing. Most of the commonly used opioids in adults are used in children, with the increasing exception of codeine (as a result of regulatory change), and are generally well tolerated. Patient groups at increased risk of ventilatory impairment include neonates and those with obstructive sleep apnoea, severe neurodevelopmental conditions, trisomy 21, and severe epilepsy. Slow-release opioids are not recommended for general use, but may be used in select populations, for example, following scoliosis surgery, major trauma or burns. Prescribing and administration errors are a major issue in paediatrics generally; the potential consequences of opioid prescribing or administration errors are serious, particularly following hospital discharge. Opioids prescribed at discharge are frequently in excess of a child's analgesic requirements; three to five days supply appears sufficient for the majority of common paediatric operations. Discharge opioid prescriptions have been linked to long-term opioid use in adolescents with risk factors. Misuse of prescription opioids by adolescents is also concerning, with prevalence estimates ranging from 1.1% to 20%. Caregivers have a tendency to underdose opioids in their children; caregiver education may improve appropriate administration. Caregivers must also be provided with instructions on safe storage and disposal of unused opioids.
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Affiliation(s)
- Derek M Rosen
- Department of Anaesthesia and Pain Management, Queensland Children's Hospital, Brisbane, Queensland, Australia.,University of Queensland, Queensland, Brisbane, Australia
| | - Mark M Alcock
- Department of Anaesthesia and Pain Management, Queensland Children's Hospital, Brisbane, Queensland, Australia.,University of Queensland, Queensland, Brisbane, Australia
| | - Greta M Palmer
- Department of Anaesthesia and Pain Management, Royal Children's Hospital, Melbourne, Victoria, Australia.,University of Melbourne, Melbourne, Victoria, Australia
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24
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Eculizumab precision dosing algorithm for thrombotic microangiopathy in children and young adults undergoing HSCT. Blood Adv 2022; 6:1454-1463. [PMID: 35008105 PMCID: PMC8905690 DOI: 10.1182/bloodadvances.2021006523] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 12/17/2021] [Indexed: 11/27/2022] Open
Abstract
This large study examined eculizumab PK/PD in bleeding and nonbleeding patients with TA-TMA. PK/PD model-based eculizumab dosing is needed for bleeding in TA-TMA, whereas fixed-dose regimens are effective in nonbleeding patients.
Transplant-associated thrombotic microangiopathy (TA-TMA) is a fatal posttransplant complication of hematopoietic stem cell transplantation. We recently reported that survival for TA-TMA has been improved by early intervention with eculizumab, a complement C5 inhibitor, guided by pharmacokinetic/pharmacodynamic (PK/PD) model-informed precision dosing. However, patients with gastrointestinal bleeding showed poor survival, even when treated with more frequent doses. Our objective was to develop separate models in bleeding and nonbleeding patients with TA-TMA and to propose precision dosing algorithms. Eculizumab PK/PD was analyzed in 19 bleeding and 38 nonbleeding patients (0.5-29.9 years of age). A complement activation biomarker (sC5b-9) and body weight were identified as significant determinants of eculizumab clearance regardless of bleeding. Eculizumab clearance after the first dose was higher in bleeding than in nonbleeding patients (83.8 vs 61.3 mL/h per 70 kg; P = .07). The high clearance was maintained over treatment doses in bleeding patients, whereas nonbleeding patients showed a time-dependent decrease in clearance. sC5b-9 levels were highest before the first dose and decreased over time, regardless of bleeding complications. A Monte Carlo Simulation analysis showed that the current dosing protocols recommended for atypical hemolytic uremic syndrome had <15% probability of attaining the target concentration of >100 μg/mL eculizumab in nonbleeding patients. We identified an intensified loading protocol to reach 80% target attainment. Our data clearly showed the need for individualized dosing for patients with significant bleeding and for ongoing dose adjustments to optimize outcomes. The developed models will be incorporated into a clinical decision guideline for precision dosing to improve outcomes in children and young adults with TA-TMA.
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25
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Jovanović M, Vučićević K. Pediatric pharmacokinetic considerations and implications for drug dosing. ARHIV ZA FARMACIJU 2022. [DOI: 10.5937/arhfarm72-37605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
Abstract
Optimizing the dosing of medicines for pediatric patients in routine clinical practice and determining the dose for clinical trials is still a challenging task. Children differ from adults in their response to drugs due to inherent differences in pharmacokinetics and/or pharmacodynamics, and responses may also vary among pediatric patients of different ages. However, the greatest disparities compared to adult pharmacokinetic profiles are observed in children below 2 years of age. The maturation of the liver and the kidneys, as well as the variation in body composition, are considered to be the main sources of pharmacokinetic variability. Hence, besides specific pharmacodynamic features, understanding age-related changes in drug absorption, distribution, and elimination is fundamental for optimizing drug efficacy and avoiding toxicity. This paper summarizes the pharmacokinetic changes throughout the childhood, along with the effect of developmental changes on drug dosage calculation. In clinical practice, age and body weight-based dosing regimens are usually used. In spite of dosing recommendations based on age and/or body weight, variabilities in pharmacokinetics and pharmacodynamic response remain, implying a need to monitor patients and optimize the dosing regimen according to physiological characteristics, disease characteristics and therapy.
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26
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Barker CIS, Groeneweg G, Maitland-van der Zee AH, Rieder MJ, Hawcutt DB, Hubbard TJ, Swen JJ, Carleton BC. Pharmacogenomic testing in paediatrics: clinical implementation strategies. Br J Clin Pharmacol 2021; 88:4297-4310. [PMID: 34907575 PMCID: PMC9544158 DOI: 10.1111/bcp.15181] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Revised: 10/22/2021] [Accepted: 11/09/2021] [Indexed: 11/27/2022] Open
Abstract
Pharmacogenomics (PGx) relates to the study of genetic factors determining variability in drug response. Implementing PGx testing in paediatric patients can enhance drug safety, helping to improve drug efficacy or reduce the risk of toxicity. Despite its clinical relevance, the implementation of PGx testing in paediatric practice to date has been variable and limited. As with most paediatric pharmacological studies, there are well‐recognised barriers to obtaining high‐quality PGx evidence, particularly when patient numbers may be small, and off‐label or unlicensed prescribing remains widespread. Furthermore, trials enrolling small numbers of children can rarely, in isolation, provide sufficient PGx evidence to change clinical practice, so extrapolation from larger PGx studies in adult patients, where scientifically sound, is essential. This review paper discusses the relevance of PGx to paediatrics and considers implementation strategies from a child health perspective. Examples are provided from Canada, the Netherlands and the UK, with consideration of the different healthcare systems and their distinct approaches to implementation, followed by future recommendations based on these cumulative experiences. Improving the evidence base demonstrating the clinical utility and cost‐effectiveness of paediatric PGx testing will be critical to drive implementation forwards. International, interdisciplinary collaborations will enhance paediatric data collation, interpretation and evidence curation, while also supporting dedicated paediatric PGx educational initiatives. PGx consortia and paediatric clinical research networks will continue to play a central role in the streamlined development of effective PGx implementation strategies to help optimise paediatric pharmacotherapy.
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Affiliation(s)
- Charlotte I S Barker
- Department of Medical & Molecular Genetics, King's College London, London, UK.,Department of Clinical Genetics, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - Gabriella Groeneweg
- Division of Translational Therapeutics, Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada.,Pharmaceutical Outcomes Programme, BC Children's Hospital, Vancouver, British Columbia, Canada
| | - Anke H Maitland-van der Zee
- Respiratory Medicine/Pediatric Respiratory Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands
| | - Michael J Rieder
- Departments of Paediatrics, Physiology and Pharmacology and Medicine, Western University, London, Ontario, Canada.,Molecular Medicine Group, Robarts Research Institute, London, Ontario, Canada
| | - Daniel B Hawcutt
- Department of Women's and Children's Health, University of Liverpool, Liverpool, UK.,NIHR Clinical Research Facility, Alder Hey Children's Hospital, Liverpool, UK
| | - Tim J Hubbard
- Department of Medical & Molecular Genetics, King's College London, London, UK.,Genomics England, London, UK
| | - Jesse J Swen
- Department of Clinical Pharmacy and Toxicology, Leiden University Medical Center, Leiden, The Netherlands.,Leiden Network for Personalized Therapeutics, Leiden, The Netherlands
| | - Bruce C Carleton
- Division of Translational Therapeutics, Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada.,Pharmaceutical Outcomes Programme, BC Children's Hospital, Vancouver, British Columbia, Canada.,BC Children's Hospital Research Institute, Vancouver, British Columbia, Canada
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27
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Hu X, Zhang X, Wang Y, Xie X. Cross-sectional study on the drug utilization and evaluation indicator of antibiotics used in pediatric population. BMC Health Serv Res 2021; 21:1091. [PMID: 34645451 PMCID: PMC8515659 DOI: 10.1186/s12913-021-06727-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 07/01/2021] [Indexed: 12/27/2022] Open
Abstract
Background The lack of medication standards is a serious problem in paediatrics mainly because of age-related differences in organ development and physiological functions in children. Consequently, dosage measurement becomes inaccurate. For this reason, methods for evaluating and monitoring rational paediatric medications should be developed. Drug use indicators, such as those similar to the drug utilisation index (DUI) based on the Anatomical Therapeutic Chemical/Defined Daily Dose (DDD) and widely used for the assessment of appropriate dosage in adults, should be explored in terms of their applicability to children. Methods A total of 5,538 prescriptions of antibiotics selected from a general teaching hospital were included. Drug, dose, frequency and treatment duration were obtained from each prescription. The prescription daily dose (PDD) of each antibiotic drug was calculated as the average of the daily doses. Underdose and overdose were determined in terms of the PDD/DDD ratio for each prescription. Children’s DUI (cDUI) was explored in terms of the appropriate dosage for children as follows: the meaning of children’s DDD (cDDD) and the evaluation of paediatric drug dosage. Results The top five antibiotics and their utilisation rates were as follows: cefmetazole sodium injection (18.47 %), erythromycin lactobionate injection (15.07 %), amoxicillin/clavulanate potassium injection (10.72 %), ceftriaxone sodium injection (9.50 %) and azithromycin dry suspension (8.02 %). The ratio of cDUI and PDD/cDDD was mostly not close to 1. Conclusions The establishment of a cDUI system is an effective means of paediatric dosage evaluation. In addition to DDDs, cDUI and PDD/cDDD should be used to analyse the utilisation of antibiotics in children.
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Affiliation(s)
- Xu Hu
- Department of Basic and Clinical Pharmacology, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, 81 Meishan Road, Hefei, 230032, Anhui, People's Republic of China.,Inflammation and Immune-Mediated Diseases Laboratory of Anhui Province, Hefei, People's Republic of China
| | - Xueting Zhang
- Department of Basic and Clinical Pharmacology, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, 81 Meishan Road, Hefei, 230032, Anhui, People's Republic of China.,Inflammation and Immune-Mediated Diseases Laboratory of Anhui Province, Hefei, People's Republic of China
| | - Yao Wang
- Department of Basic and Clinical Pharmacology, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, 81 Meishan Road, Hefei, 230032, Anhui, People's Republic of China.,Inflammation and Immune-Mediated Diseases Laboratory of Anhui Province, Hefei, People's Republic of China
| | - Xuefeng Xie
- Department of Basic and Clinical Pharmacology, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, 81 Meishan Road, Hefei, 230032, Anhui, People's Republic of China. .,Inflammation and Immune-Mediated Diseases Laboratory of Anhui Province, Hefei, People's Republic of China.
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28
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van der Stoep MYEC, Bertaina A, Moes DJAR, Algeri M, Bredius RGM, Smiers FJW, Berghuis D, Buddingh EP, Mohseny AB, Guchelaar HJ, Locatelli F, Zwaveling J, Lankester AC. Impact of Treosulfan Exposure on Early and Long-Term Clinical Outcomes in Pediatric Allogeneic Hematopoietic Stem Cell Transplantation Recipients: A Prospective Multicenter Study. Transplant Cell Ther 2021; 28:99.e1-99.e7. [PMID: 34607071 DOI: 10.1016/j.jtct.2021.09.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 09/22/2021] [Accepted: 09/22/2021] [Indexed: 11/11/2022]
Abstract
Treosulfan-based conditioning has gained popularity in pediatric allogeneic hematopoietic stem cell transplantation (HSCT) because of its presumed favorable efficacy and toxicity profile. Treosulfan is used in standardized dosing regimens based on body surface area. The relationships between systemic treosulfan exposure and early and long-term clinical outcomes in pediatric patients undergoing allogeneic HSCT for nonmalignant diseases remain unclear. In this a multicenter, prospective observational study, we assessed the association between treosulfan exposure and early and, in particular, long-term clinical outcomes. Our study cohort comprised 110 pediatric patients with nonmalignant diseases who underwent HSCT between 2011 and 2019 in Leiden, The Netherlands and Rome, Italy. Blood samples were collected, and treosulfan area under the receiver operating characteristic curve (AUC0-∞) was estimated as a measure of exposure. Cox proportional hazard survival analyses were performed to assess the relationships between treosulfan exposure and overall survival (OS) and event-free survival (EFS). The predictive value of systemic treosulfan exposure for the occurrence of toxicity within 28 days was evaluated using a multivariable logistic regression analysis. In the overall cohort, OS and EFS at 2 years were 89.0% and 75.3%, respectively, with an excellent OS of 97% in children age <2 years. The occurrence of grade II-IV acute graft-versus-host disease, the level of 1-year whole blood chimerism, and 2-year OS and EFS were not correlated with treosulfan exposure. The occurrence of skin toxicity (odds ratio [OR], 3.97; 95% confidence interval [CI], 1.26-13.68; P = .02) and all-grade mucositis (OR, 4.43; 95% CI, 1.43-15.50; P = .02), but not grade ≥2 mucositis (OR, 1.51; 95% CI, 0.52 to 4.58; P = .46) was related to high treosulfan exposure (>1750 mg*h/L). Our study demonstrates that standardized treosulfan-based conditioning results in a favorable OS and EFS in infants and children with nonmalignant diseases, independent of interindividual variation in treosulfan exposure. These outcomes can be achieved without the need for therapeutic drug monitoring, thereby emphasizing the advantage of treosulfan use in this category of patients. Although higher treosulfan exposure increases the risk of skin toxicity, there is no absolute necessity for therapeutic drug monitoring if proper preventive skin measures are taken. More research is needed to assess whether deescalation of treosulfan doses is possible to minimize early and long-term toxicity without compromising efficacy.
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Affiliation(s)
- M Y Eileen C van der Stoep
- Department of Clinical Pharmacy and Toxicology, Leiden University Medical Center, Leiden, The Netherlands
| | - Alice Bertaina
- Department of Paediatric Hematology/Oncology and Cell and Gene Therapy, Istituto di Ricovero e Cura a Carattere Scientifico Bambino Gesù Children's Hospital, Rome, Sapienza, University of Rome, Italy
| | - Dirk Jan A R Moes
- Department of Clinical Pharmacy and Toxicology, Leiden University Medical Center, Leiden, The Netherlands
| | - Mattia Algeri
- Department of Paediatric Hematology/Oncology and Cell and Gene Therapy, Istituto di Ricovero e Cura a Carattere Scientifico Bambino Gesù Children's Hospital, Rome, Sapienza, University of Rome, Italy
| | - Robbert G M Bredius
- Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands
| | - Frans J W Smiers
- Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands
| | - Dagmar Berghuis
- Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands
| | - Emilie P Buddingh
- Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands
| | - Alexander B Mohseny
- Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands
| | - Henk-Jan Guchelaar
- Department of Clinical Pharmacy and Toxicology, Leiden University Medical Center, Leiden, The Netherlands
| | - Franco Locatelli
- Department of Paediatric Hematology/Oncology and Cell and Gene Therapy, Istituto di Ricovero e Cura a Carattere Scientifico Bambino Gesù Children's Hospital, Rome, Sapienza, University of Rome, Italy
| | - Juliette Zwaveling
- Department of Clinical Pharmacy and Toxicology, Leiden University Medical Center, Leiden, The Netherlands
| | - Arjan C Lankester
- Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands.
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29
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Yoneyama K, Schmitt C, Chang T, Dhalluin C, Nagami S, Petry C, Levy GG. A Model-Based Framework to Inform the Dose Selection and Study Design of Emicizumab for Pediatric Patients With Hemophilia A. J Clin Pharmacol 2021; 62:232-244. [PMID: 34545950 PMCID: PMC9298840 DOI: 10.1002/jcph.1968] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Accepted: 09/10/2021] [Indexed: 12/13/2022]
Abstract
Emicizumab is a bispecific antibody mimicking the cofactor function of activated coagulation factor VIII to prevent bleeds in patients with hemophilia A. The dose selection for the first-in-child phase III study of emicizumab was addressed by pediatric pharmacokinetic prediction using an adult/adolescent population pharmacokinetic model developed in phase I-I/II studies. The model was modified to incorporate functions describing the age-dependent increase in body weight (BW) with or without clearance maturation to account for the differences in emicizumab pharmacokinetics between adults/adolescents and children. A minimal dose anticipated to achieve in children the same target efficacious exposure as for adults/adolescents was identified when considering BW and clearance maturation. It was the same BW-based dose as for adults/adolescents and was selected for the starting dose for the pediatric study. Whether considering clearance maturation or not in addition to BW led to uncertainty in the pediatric pharmacokinetic prediction and dose selection, which informed implementation of a dose-adapting scheme in the study design. Exposure matching to adults/adolescents was ultimately achieved in children with the starting dose, indicating that consideration of clearance maturation in addition to BW provided adequate pediatric pharmacokinetic predictions for emicizumab. This pharmacokinetic finding in conjunction with exposure-response information served as a basis for the efficacy demonstrated in children, avoiding a time-consuming process for exploring an optimal pediatric dose of emicizumab. This experience indicates that a model-based framework helped optimize the pediatric dose selection and study design, thereby streamlining the development process with extrapolation, of emicizumab for children.
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Affiliation(s)
| | | | - Tiffany Chang
- Genentech, Inc., South San Francisco, California, USA
| | | | | | | | - Gallia G Levy
- Genentech, Inc., South San Francisco, California, USA
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30
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Garcia-Prats AJ, Svensson EM, Winckler J, Draper HR, Fairlie L, van der Laan LE, Masenya M, Schaaf HS, Wiesner L, Norman J, Aarnoutse RE, Karlsson MO, Denti P, Hesseling AC. Pharmacokinetics and safety of high-dose rifampicin in children with TB: the Opti-Rif trial. J Antimicrob Chemother 2021; 76:3237-3246. [PMID: 34529779 DOI: 10.1093/jac/dkab336] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Accepted: 08/14/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Rifampicin doses of 40 mg/kg in adults are safe and well tolerated, may shorten anti-TB treatment and improve outcomes, but have not been evaluated in children. OBJECTIVES To characterize the pharmacokinetics and safety of high rifampicin doses in children with drug-susceptible TB. PATIENTS AND METHODS The Opti-Rif trial enrolled dosing cohorts of 20 children aged 0-12 years, with incremental dose escalation with each subsequent cohort, until achievement of target exposures or safety concerns. Cohort 1 opened with a rifampicin dose of 15 mg/kg for 14 days, with a single higher dose (35 mg/kg) on day 15. Pharmacokinetic data from days 14 and 15 were analysed using population modelling and safety data reviewed. Incrementally increased rifampicin doses for the next cohort (days 1-14 and day 15) were simulated from the updated model, up to the dose expected to achieve the target exposure [235 mg/L·h, the geometric mean area under the concentration-time curve from 0 to 24 h (AUC0-24) among adults receiving a 35 mg/kg dose]. RESULTS Sixty-two children were enrolled in three cohorts. The median age overall was 2.1 years (range = 0.4-11.7). Evaluated doses were ∼35 mg/kg (days 1-14) and ∼50 mg/kg (day 15) for cohort 2 and ∼60 mg/kg (days 1-14) and ∼75 mg/kg (day 15) for cohort 3. Approximately half of participants had an adverse event related to study rifampicin; none was grade 3 or higher. A 65-70 mg/kg rifampicin dose was needed in children to reach the target exposure. CONCLUSIONS High rifampicin doses in children achieved target exposures and the doses evaluated were safe over 2 weeks.
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Affiliation(s)
- Anthony J Garcia-Prats
- Desmond Tutu TB Centre, Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences, Stellenbosch University, PO Box 241, Cape Town 8000, South Africa.,Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, 2870 University Avenue, Suite 200, Madison, WI 53705, USA
| | - Elin M Svensson
- Department of Pharmacy, Radboud Institute for Health Sciences, Radboud University Medical Center, PO Box 9101, 6500 HB Nijmegen (864), The Netherlands.,Department of Pharmacy, Uppsala University, PO Box 580, 751 23 Uppsala, Sweden
| | - Jana Winckler
- Desmond Tutu TB Centre, Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences, Stellenbosch University, PO Box 241, Cape Town 8000, South Africa
| | - Heather R Draper
- Desmond Tutu TB Centre, Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences, Stellenbosch University, PO Box 241, Cape Town 8000, South Africa
| | - Lee Fairlie
- Wits Reproductive Health and HIV Institute Shandukani CRS, Faculty of Health Sciences, University of the Witwatersrand, 22 Esselen Street, Hilbrow 2001, South Africa
| | - Louvina E van der Laan
- Desmond Tutu TB Centre, Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences, Stellenbosch University, PO Box 241, Cape Town 8000, South Africa
| | - Masebole Masenya
- Wits Reproductive Health and HIV Institute Shandukani CRS, Faculty of Health Sciences, University of the Witwatersrand, 22 Esselen Street, Hilbrow 2001, South Africa
| | - H Simon Schaaf
- Desmond Tutu TB Centre, Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences, Stellenbosch University, PO Box 241, Cape Town 8000, South Africa
| | - Lubbe Wiesner
- Division of Clinical Pharmacology, Department of Medicine, University of Cape Town, K45 Old Main Building, Groote Schuur Hospital, Observatory, Cape Town 7925, South Africa
| | - Jennifer Norman
- Division of Clinical Pharmacology, Department of Medicine, University of Cape Town, K45 Old Main Building, Groote Schuur Hospital, Observatory, Cape Town 7925, South Africa
| | - Rob E Aarnoutse
- Department of Pharmacy, Radboud Institute for Health Sciences, Radboud University Medical Center, PO Box 9101, 6500 HB Nijmegen (864), The Netherlands
| | - Mats O Karlsson
- Department of Pharmacy, Uppsala University, PO Box 580, 751 23 Uppsala, Sweden
| | - Paolo Denti
- Division of Clinical Pharmacology, Department of Medicine, University of Cape Town, K45 Old Main Building, Groote Schuur Hospital, Observatory, Cape Town 7925, South Africa
| | - Anneke C Hesseling
- Desmond Tutu TB Centre, Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences, Stellenbosch University, PO Box 241, Cape Town 8000, South Africa
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Salerno SN, Carreño FO, Edginton AN, Cohen-Wolkowiez M, Gonzalez D. Leveraging Physiologically Based Pharmacokinetic Modeling and Experimental Data to Guide Dosing Modification of CYP3A-Mediated Drug-Drug Interactions in the Pediatric Population. Drug Metab Dispos 2021; 49:844-855. [PMID: 34154994 PMCID: PMC10441624 DOI: 10.1124/dmd.120.000318] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Accepted: 06/02/2021] [Indexed: 11/22/2022] Open
Abstract
Solithromycin is a novel fluoroketolide antibiotic that is both a substrate and time-dependent inhibitor of CYP3A. Solithromycin has demonstrated efficacy in adults with community-acquired bacterial pneumonia and has also been investigated in pediatric patients. The objective of this study was to develop a framework for leveraging physiologically based pharmacokinetic (PBPK) modeling to predict CYP3A-mediated drug-drug interaction (DDI) potential in the pediatric population using solithromycin as a case study. To account for age, we performed in vitro metabolism and time-dependent inhibition studies for solithromycin for CYP3A4, CYP3A5, and CYP3A7. The PBPK model included CYP3A4 and CYP3A5 metabolism and time-dependent inhibition, glomerular filtration, P-glycoprotein transport, and enterohepatic recirculation. The average fold error of simulated and observed plasma concentrations of solithromycin in both adults (1966 plasma samples) and pediatric patients from 4 days to 17.9 years (684 plasma samples) were within 0.5- to 2.0-fold. The geometric mean ratios for the simulated area under the concentration versus time curve (AUC) extrapolated to infinity were within 0.75- to 1.25-fold of observed values in healthy adults receiving solithromycin with midazolam or ketoconazole. DDI potential was simulated in pediatric patients (1 month to 17 years of age) and adults. Solithromycin increased the simulated midazolam AUC 4- to 6-fold, and ketoconazole increased the simulated solithromycin AUC 1- to 2-fold in virtual subjects ranging from 1 month to 65 years of age. This study presents a systematic approach for incorporating CYP3A in vitro data into adult and pediatric PBPK models to predict pediatric CYP3A-mediated DDI potential. SIGNIFICANCE STATEMENT: Using solithromycin, this study presents a framework for investigating and incorporating CYP3A4, CYP3A5, and CYP3A7 in vitro data into adult and pediatric physiologically based pharmacokinetic models to predict CYP3A-mediated DDI potential in adult and pediatric subjects during drug development. In this study, minor age-related differences in inhibitor concentration resulted in differences in the magnitude of the DDI. Therefore, age-related differences in DDI potential for substrates metabolized primarily by CYP3A4 can be minimized by closely matching adult and pediatric inhibitor concentrations.
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Affiliation(s)
- Sara N Salerno
- Division of Pharmacotherapy and Experimental Therapeutics, UNC Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina (S.N.S., F.O.C., D.G.); School of Pharmacy, University of Waterloo, Kitchener, ON, Canada (A.N.E.); Duke Clinical Research Institute, Durham, NC, USA (M.C.-W.); Department of Pediatrics, Duke University School of Medicine, Durham, North Carolina (M.C.-W.)
| | - Fernando O Carreño
- Division of Pharmacotherapy and Experimental Therapeutics, UNC Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina (S.N.S., F.O.C., D.G.); School of Pharmacy, University of Waterloo, Kitchener, ON, Canada (A.N.E.); Duke Clinical Research Institute, Durham, NC, USA (M.C.-W.); Department of Pediatrics, Duke University School of Medicine, Durham, North Carolina (M.C.-W.)
| | - Andrea N Edginton
- Division of Pharmacotherapy and Experimental Therapeutics, UNC Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina (S.N.S., F.O.C., D.G.); School of Pharmacy, University of Waterloo, Kitchener, ON, Canada (A.N.E.); Duke Clinical Research Institute, Durham, NC, USA (M.C.-W.); Department of Pediatrics, Duke University School of Medicine, Durham, North Carolina (M.C.-W.)
| | - Michael Cohen-Wolkowiez
- Division of Pharmacotherapy and Experimental Therapeutics, UNC Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina (S.N.S., F.O.C., D.G.); School of Pharmacy, University of Waterloo, Kitchener, ON, Canada (A.N.E.); Duke Clinical Research Institute, Durham, NC, USA (M.C.-W.); Department of Pediatrics, Duke University School of Medicine, Durham, North Carolina (M.C.-W.)
| | - 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 (S.N.S., F.O.C., D.G.); School of Pharmacy, University of Waterloo, Kitchener, ON, Canada (A.N.E.); Duke Clinical Research Institute, Durham, NC, USA (M.C.-W.); Department of Pediatrics, Duke University School of Medicine, Durham, North Carolina (M.C.-W.)
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Tu Q, Cotta M, Raman S, Graham N, Schlapbach L, Roberts JA. Individualized precision dosing approaches to optimize antimicrobial therapy in pediatric populations. Expert Rev Clin Pharmacol 2021; 14:1383-1399. [PMID: 34313180 DOI: 10.1080/17512433.2021.1961578] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Introduction:Severe infections continue to impose a major burden on critically ill children and mortality rates remain stagnant. Outcomes rely on accurate and timely delivery of antimicrobials achieving target concentrations in infected tissue. Yet, developmental aspects, disease-related variables, and host factors may severely alter antimicrobial pharmacokinetics in pediatrics. The emergence of antimicrobial resistance increases the need for improved treatment approaches.Areas covered:This narrative review explores why optimization of antimicrobial therapy in neonates, infants, children, and adolescents is crucial and summarizes the possible dosing approaches to achieve antimicrobial individualization. Finally, we outline a roadmap toward scientific evidence informing the development and implementation of precision antimicrobial dosing in critically ill children.The literature search was conducted on PubMed using the following keywords: neonate, infant, child, adolescent, pediatrics, antimicrobial, pharmacokinetic, pharmacodynamic target, Bayes dosing software, optimizing, individualizing, personalizing, precision dosing, drug monitoring, validation, attainment, and software implementation. Further articles were sought from the references of the above searched articles.Expert opinion:Recently, technological innovations have emerged that enabled the development of individualized antimicrobial dosing approaches in adults. More work is required in pediatrics to make individualized antimicrobial dosing approaches widely operationalized in this population.
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Affiliation(s)
- Quyen Tu
- University of Queensland Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Brisbane, QLD, Australia.,Department of Pharmacy, Queensland Children's Hospital, Brisbane, QLD, Australia
| | - Menino Cotta
- University of Queensland Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Brisbane, QLD, Australia
| | - Sainath Raman
- Department of Paediatric Intensive Care Medicine, Queensland Children's Hospital, Brisbane, QLD, Australia.,Centre for Children's Health Research (CCHR), The University of Queensland, Brisbane, QLD, Australia
| | - Nicolette Graham
- Department of Pharmacy, Queensland Children's Hospital, Brisbane, QLD, Australia
| | - Luregn Schlapbach
- Department of Paediatric Intensive Care Medicine, Queensland Children's Hospital, Brisbane, QLD, Australia.,Department of Intensive Care and Neonatology, The University Children's Hospital Zurich, Switzerland
| | - Jason A Roberts
- University of Queensland Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Brisbane, QLD, Australia.,Departments of Pharmacy and Intensive Care Medicine, Royal Brisbane and Women's Hospital, Brisbane, Australia.,Division of Anaesthesiology Critical Care Emergency and Pain Medicine, Nîmes University Hospital, University of Montpellier, Nîmes, France
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van den Anker J, Allegaert K. Considerations for Drug Dosing in Premature Infants. J Clin Pharmacol 2021; 61 Suppl 1:S141-S151. [PMID: 34185893 DOI: 10.1002/jcph.1884] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Accepted: 04/21/2021] [Indexed: 12/13/2022]
Abstract
In premature infants, effective and safe drug therapy depends on optimal dose selection and requires a thorough understanding of the underlying disease(s) of these fragile infants as well as the pharmacokinetics and pharmacodynamics of the drugs selected to treat their diseases. Differences in gestational and postnatal age or weight are the major determinants of the observed variability in drug disposition and effect in these infants. This article presents an outline on how to translate the results of a population pharmacokinetic/pharmacodynamic study into rational dosing regimens, and how physiologically based pharmacokinetic modeling, electronic health records, and the abundantly available data of vital functions of premature infants during their stay in the neonatal intensive care unit for evaluation of their pharmacotherapy can be used to tailor the most safe and effective dose in these infants.
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Affiliation(s)
- John van den Anker
- Division of Clinical Pharmacology, Children's National Hospital, Washington, DC, USA.,Division of Paediatric Pharmacology and Pharmacometrics, University Children's Hospital Basel, University of Basel, Basel, Switzerland.,Intensive Care and Department of Pediatric Surgery, Erasmus Medical Center-Sophia Children's Hospital, Rotterdam, The Netherlands
| | - Karel Allegaert
- Department of Hospital Pharmacy, Erasmus MC-Sophia Children's Hospital, Rotterdam, The Netherlands.,Department of Development and Regeneration, KU Leuven, Leuven, Belgium.,Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Leuven, Belgium
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34
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Chandra S, Mizuno K, Zhao J, Davies SM, Marsh RA, Fukuda T, Setchell KDR, Vinks AA, Mehta PA. Test-dose pharmacokinetics guided melphalan dose adjustment in reduced intensity conditioning allogeneic transplant for non-malignant disorders. Br J Clin Pharmacol 2021; 88:115-127. [PMID: 34075614 DOI: 10.1111/bcp.14932] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 05/07/2021] [Accepted: 05/23/2021] [Indexed: 12/16/2022] Open
Abstract
AIMS We studied melphalan pharmacokinetics (PK) and feasibility of melphalan full-dose adjustment based on test-dose PK in children and young adults with non-malignant disorders (NMD) undergoing allogeneic hematopoietic cell transplantation (HCT) using reduced intensity conditioning (RIC) containing alemtuzumab, fludarabine and melphalan. METHODS Patients received test-dose melphalan (10% of planned full-dose) prior to conditioning. Blood samples for PK were obtained around test and full-dose melphalan (140 mg/m2 or 4.7 mg/kg in patients <10 kg). Melphalan concentration was measured by liquid chromatography electrospray ionization tandem mass-spectrometry assay and data were analysed using a population-PK model and Bayesian estimation. Test and full-dose melphalan clearance estimates were evaluated by pairwise Wilcoxon test and Bland-Altman plot. RESULTS Twenty-four patients undergoing 25 transplants were included in the final analysis. Patients received standard full-dose melphalan in 17 transplants, with median area under the concentration-time curve (AUC) of 5.5 mg*h/L (range, 3.0-9.5 mg*h/L). Patients received test-dose melphalan in 23 transplants with a test-dose PK predicted full-dose AUC range of 2.9-16.8 mg*h/L. In seven transplants where patients had baseline organ impairment, test-dose PK predicted higher exposure for standard full-dose (median AUC 13.8 mg*h/L). Melphalan full-dose was adjusted in these patients, with achievement of desired target AUC (3.6-5.4 mg*h/L) and no excess toxicity. Mean ratio of test-dose clearance to full-dose clearance was 1.03. Twenty of 22 patients (91%) were within the 95% confidence intervals of the clearance ratio. CONCLUSION Melphalan test-dose PK reliably predicts full-dose PK and allows for accurate adjustment of full-dose melphalan in RIC-HCT for NMD. This approach can avoid excess toxicity from increased systemic exposure, especially in patients with organ impairment.
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Affiliation(s)
- Sharat Chandra
- Divisions of Bone Marrow Transplantation and Immune Deficiency, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, United States.,Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, United States
| | - Kana Mizuno
- Clinical Pharmacology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, United States
| | - Junfang Zhao
- Pathology & Laboratory Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, United States
| | - Stella M Davies
- Divisions of Bone Marrow Transplantation and Immune Deficiency, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, United States.,Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, United States
| | - Rebecca A Marsh
- Divisions of Bone Marrow Transplantation and Immune Deficiency, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, United States.,Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, United States
| | - Tsuyoshi Fukuda
- Clinical Pharmacology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, United States.,Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, United States
| | - Kenneth D R Setchell
- Pathology & Laboratory Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, United States.,Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, United States
| | - Alexander A Vinks
- Clinical Pharmacology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, United States.,Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, United States
| | - Parinda A Mehta
- Divisions of Bone Marrow Transplantation and Immune Deficiency, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, United States.,Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, United States
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35
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Sepúlveda PO, Epulef V, Campos G. Why do We Use the Concepts of Adult Anesthesia Pharmacology in Developing Brains? Will It Have an Impact on Outcomes? Challenges in Neuromonitoring and Pharmacology in Pediatric Anesthesia. J Clin Med 2021; 10:2175. [PMID: 34069896 PMCID: PMC8157588 DOI: 10.3390/jcm10102175] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 05/07/2021] [Accepted: 05/07/2021] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Pediatric sedation and anesthesia techniques have plenty of difficulties and challenges. Data on the pharmacologic, electroencephalographic, and neurologic response to anesthesia at different brain development times are only partially known. New data in neuroscience, pharmacology, and intraoperative neuromonitoring will impact changing concepts and clinical practice. In this article, we develop a conversation to guide the debate and search for a view more attuned to the updated knowledge in neurodevelopment, electroencephalography, and clinical pharmacology for the anesthesiologic practice in the pediatric population.
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Affiliation(s)
- Pablo O. Sepúlveda
- Hospital Base San José de Osorno, Service Anesthesiology and Pain, Faculty of Medicine, University Austral, Los Lagos 529000, Chile
| | - Valeria Epulef
- Department of Surgery, Traumatology and Anesthesiology, Medicine Faculty, Universidad de La Frontera, Temuco 4780000, Chile;
- Hospital Hernán Henriquez Aravena, Temuco 4780000, Chile
| | - Gustavo Campos
- Hospital Pediatrico Niño Jesús, Service of Anesthesiology, Córdoba 5500, Argentina;
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36
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Garcia-Prats AJ, Salazar-Austin N, Conway JH, Radtke K, LaCourse SM, Maleche-Obimbo E, Hesseling AC, Savic RM, Nachman S. Coronavirus Disease 2019 (COVID-19) Pharmacologic Treatments for Children: Research Priorities and Approach to Pediatric Studies. Clin Infect Dis 2021; 72:1067-1073. [PMID: 32594142 PMCID: PMC7337679 DOI: 10.1093/cid/ciaa885] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 06/23/2020] [Indexed: 02/06/2023] Open
Abstract
Clinical trials of pharmacologic treatments of coronavirus disease 2019 (COVID-19) are being rapidly designed and implemented in adults. Children are often not considered during development of novel treatments for infectious diseases until very late. Although children appear to have a lower risk compared with adults of severe COVID-19 disease, a substantial number of children globally will benefit from pharmacologic treatments. It will be reasonable to extrapolate efficacy of most treatments from adult trials to children. Pediatric trials should focus on characterizing a treatment's pharmacokinetics, optimal dose, and safety across the age spectrum. These trials should use an adaptive design to efficiently add or remove arms in what will be a rapidly evolving treatment landscape, and should involve a large number of sites across the globe in a collaborative effort to facilitate efficient implementation. All stakeholders must commit to equitable access to any effective, safe treatment for children everywhere.
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Affiliation(s)
- Anthony J Garcia-Prats
- Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA
- Desmond Tutu TB Centre, Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, South Africa
| | - Nicole Salazar-Austin
- Department of Pediatrics, Division of Infectious Diseases, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - James H Conway
- Department of Pediatrics, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA
| | - Kendra Radtke
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, California, USA
| | - Sylvia M LaCourse
- Departments of Medicine and Global Health, Division of Allergy and Infectious Diseases, University of Washington, Seattle, Washington, USA
| | | | - Anneke C Hesseling
- Desmond Tutu TB Centre, Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, South Africa
| | - Rada M Savic
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, California, USA
| | - Sharon Nachman
- Department of Pediatrics, Stony Brook Children’s, Stony Brook, New York, USA
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37
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What is the Best Predictor of Phenobarbital Pharmacokinetics to Use for Initial Dosing in Neonates? Pharmaceutics 2021; 13:pharmaceutics13030301. [PMID: 33668911 PMCID: PMC7996486 DOI: 10.3390/pharmaceutics13030301] [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: 02/06/2021] [Revised: 02/21/2021] [Accepted: 02/22/2021] [Indexed: 11/17/2022] Open
Abstract
Phenobarbital is a first-line treatment of various seizure types in newborns. Dosage individualization maximizing the proportion of patients with drug levels in therapeutic range or sufficient treatment response is still challenging. The aim of this review was to summarize the available evidence on phenobarbital pharmacokinetics in neonates and to identify its possible covariates suitable for individualization of initial drug dosing. Several covariates have been considered: body weight and height, body surface area, gestational and postnatal age, laboratory parameters of renal and hepatic functions, asphyxia, therapeutic hypothermia, extracorporeal membrane oxygenation (ECMO), drug interactions, and genetic polymorphisms. The most frequently studied and well-founded covariate for the estimation of phenobarbital dosing is actual body weight. Loading dose of 15-20 mg/kg followed by a maintenance dose of 3-5 mg/kg/day seems to be accurate. However, the evidence for the other covariates with respect to dosing individualization is not sufficient. Doses at the lower limit of suggested range should be preferred in patients with severe asphyxia, while the upper limit of the range should be targeted in neonates receiving ECMO support.
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Methaneethorn J, Leelakanok N. Population Pharmacokinetics of Levetiracetam: a Systematic Review. ACTA ACUST UNITED AC 2021; 17:122-134. [PMID: 33622228 DOI: 10.2174/1574884716666210223110658] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2020] [Revised: 11/30/2020] [Accepted: 01/05/2021] [Indexed: 11/22/2022]
Abstract
BACKGROUND The use of levetiracetam (LEV) has been increasing given its favorable pharmacokinetic profile. Numerous population pharmacokinetic studies for LEV have been conducted. However, there are some discrepancies regarding factors affecting its pharmacokinetic variability. Therefore, this systematic review aimed to summarize significant predictors for LEV pharmacokinetics as well as the need for dosage adjustments. METHODS We performed a systematic search for population pharmacokinetic studies of LEV conducted using a nonlinear-mixed effect approach from PubMed, Scopus, CINAHL Complete, and Science Direct databases from their inception to March 2020. Information on study design, model methodologies, significant covariate-parameter relationships, and model evaluation was extracted. The quality of the reported studies was also assessed. RESULTS A total of 16 studies were included in this review. Only two studies were conducted with a two-compartment model, while the rest were performed with a one-compartment structure. Bodyweight and creatinine clearance were the two most frequently identified covariates on LEV clearance (CLLEV). Additionally, postmenstrual age (PMA) or postnatal age (PNA) were significant predictors for CLLEV in neonates. Only three studies externally validated the models. Two studies conducted pharmacodynamic models for LEV with relatively small sample size. CONCLUSION Significant predictors for LEV pharmacokinetics are highlighted in this review. For future research, a population pharmacokinetic-pharmacodynamic model using a larger sample size should be conducted. From a clinical perspective, the published models should be externally evaluated before clinical implementation.
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Affiliation(s)
- Janthima Methaneethorn
- Pharmacokinetic Research Unit, Department of Pharmacy Practice, Faculty of Pharmaceutical Sciences, Naresuan University, Phitsanulok. Thailand
| | - Nattawut Leelakanok
- Department of Clinical Pharmacy, Faculty of Pharmaceutical Sciences, Burapha University, Chonburi. Thailand
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Population Pharmacokinetic Properties of Antituberculosis Drugs in Vietnamese Children with Tuberculous Meningitis. Antimicrob Agents Chemother 2020; 65:AAC.00487-20. [PMID: 33139294 PMCID: PMC7927832 DOI: 10.1128/aac.00487-20] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Accepted: 10/13/2020] [Indexed: 11/20/2022] Open
Abstract
Optimal dosing of children with tuberculous meningitis (TBM) remains uncertain and is currently based on the treatment of pulmonary tuberculosis in adults. This study aimed to investigate the population pharmacokinetics of isoniazid, rifampin, pyrazinamide, and ethambutol in Vietnamese children with TBM, to propose optimal dosing in these patients, and to determine the relationship between drug exposure and treatment outcome. A total of 100 Vietnamese children with TBM were treated with an 8-month antituberculosis regimen. Optimal dosing of children with tuberculous meningitis (TBM) remains uncertain and is currently based on the treatment of pulmonary tuberculosis in adults. This study aimed to investigate the population pharmacokinetics of isoniazid, rifampin, pyrazinamide, and ethambutol in Vietnamese children with TBM, to propose optimal dosing in these patients, and to determine the relationship between drug exposure and treatment outcome. A total of 100 Vietnamese children with TBM were treated with an 8-month antituberculosis regimen. Nonlinear mixed-effects modeling was used to evaluate the pharmacokinetic properties of the four drugs and to simulate different dosing strategies. The pharmacokinetic properties of rifampin and pyrazinamide in plasma were described successfully by one-compartment disposition models, while those of isoniazid and ethambutol in plasma were described by two-compartment disposition models. All drug models included allometric scaling of body weight and enzyme maturation during the first years of life. Cerebrospinal fluid (CSF) penetration of rifampin was relatively poor and increased with increasing protein levels in CSF, a marker of CSF inflammation. Isoniazid and pyrazinamide showed good CSF penetration. Currently recommended doses of isoniazid and pyrazinamide, but not ethambutol and rifampin, were sufficient to achieve target exposures. The ethambutol dose cannot be increased because of ocular toxicity. Simulation results suggested that rifampin dosing at 50 mg/kg of body weight/day would be required to achieve the target exposure. Moreover, low rifampin plasma exposure was associated with an increased risk of neurological disability. Therefore, higher doses of rifampin could be considered, but further studies are needed to establish the safety and efficacy of increased dosing.
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Cáceres Guido P, Riva N, Caraballo R, Reyes G, Huaman M, Gutierrez R, Agostini S, Fabiana Delaven S, Pérez Montilla CA, García Bournissen F, Schaiquevich P. Pharmacokinetics of cannabidiol in children with refractory epileptic encephalopathy. Epilepsia 2020; 62:e7-e12. [PMID: 33280111 DOI: 10.1111/epi.16781] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 11/13/2020] [Accepted: 11/13/2020] [Indexed: 11/27/2022]
Abstract
Growing interest in the clinical use of cannabidiol (CBD) as adjuvant therapy for pediatric refractory epileptic encephalopathy emphasizes the need for drug treatment optimization. The aim of this study was to characterize the pharmacokinetics of CBD in pediatric patients with refractory epileptic encephalopathy receiving an oil-based oral solution. To evaluate CBD concentrations, six serial blood samples per patient were collected after the morning dose of CBD, at least 21 days after the beginning of treatment. Twelve patients who received a median (range) dose of 12.2 (5.3-19.4) mg/kg/d (twice daily) were included in the analysis. Median (range) CBD time to maximum plasma concentration, maximum plasma concentration, and area under the concentration versus time curve up to 6 hours after dosing were 3.2 hours (1.9-6.2), 49.6 ng/mL (14.4-302.0), and 226.3 ng ⋅ h/mL (70.5-861.3), respectively. CBD systemic exposure parameters were in the lower range of previous reports in pediatric patients receiving doses in a similar range. Most of our patients (83%) showed little CBD plasma level fluctuation during a dosing interval, comparable to that encountered after oral administration of an extended release drug delivery system. CDB administration was generally safe and well tolerated, and a novel levothyroxine-CBD interaction was recorded. Similar to other studies, large interindividual variability in CBD exposure was observed, encouraging the use of CBD therapeutic drug monitoring.
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Affiliation(s)
- Paulo Cáceres Guido
- Clinical Pharmacokinetics Unit, Pharmacy Area, Garrahan Pediatric Hospital, Buenos Aires, Argentina
| | - Natalia Riva
- Precision Medicine, Garrahan Pediatric Hospital, Buenos Aires, Argentina.,National Scientific and Technical Research Council, Buenos Aires, Argentina
| | - Roberto Caraballo
- National Scientific and Technical Research Council, Buenos Aires, Argentina.,Department of Neurology, Garrahan Pediatric Hospital, Buenos Aires, Argentina
| | - Gabriela Reyes
- Department of Neurology, Garrahan Pediatric Hospital, Buenos Aires, Argentina
| | - Marina Huaman
- Department of Neurology, Garrahan Pediatric Hospital, Buenos Aires, Argentina
| | - Robinson Gutierrez
- Department of Neurology, Garrahan Pediatric Hospital, Buenos Aires, Argentina
| | - Silvana Agostini
- Polyvalent Day Hospital, Garrahan Pediatric Hospital, Buenos Aires, Argentina
| | | | - Carlos A Pérez Montilla
- National Scientific and Technical Research Council, Buenos Aires, Argentina.,Multidisciplinary Institute for Research on Pediatric Diseases, Parasitology and Chagas Service, Buenos Aires Children's Hospital "Ricardo Gutierrez, ", Buenos Aires, Argentina
| | - Facundo García Bournissen
- National Scientific and Technical Research Council, Buenos Aires, Argentina.,Division of Paediatric Clinical Pharmacology, Department of Paediatrics, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada
| | - Paula Schaiquevich
- Precision Medicine, Garrahan Pediatric Hospital, Buenos Aires, Argentina.,National Scientific and Technical Research Council, Buenos Aires, Argentina
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Correia MR. Drug dosing in neonates. SOUTHERN AFRICAN JOURNAL OF ANAESTHESIA AND ANALGESIA 2020. [DOI: 10.36303/sajaa.2020.26.6.s3.2531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Neonates have specific physiological differences from older children and adults that influence drug pharmacokinetics (PK) and pharmacodynamics (PD). These differences necessitate adjustments in drug dosing in order to ensure efficacy and avoid toxicity in the perioperative period. Knowledge pertaining to the ontogeny of neonatal organ systems is required to ensure safety and optimal care of these patients.
The myriad of moral and operational concerns pertaining to neonatal research limits our ability to perform prospective trials and gain sufficient data to determine ideal drug dosing in this heterogenous population. Certain advances in PK and PD modelling, especially allometric theories, have improved our recent understanding and highlighted that age, maturation of organ systems and patient size must be taken into account.
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42
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Li TY, Li Z, Yang XY, Zhao XY, Zhang X, Zhao XB, Wang S, Huo XK, Shi XP. Comparative pharmacokinetics of baicalin and geniposide in juvenile and adult rats after oral administration of Qingkailing Granules. CHINESE HERBAL MEDICINES 2020; 12:446-451. [PMID: 36120172 PMCID: PMC9476668 DOI: 10.1016/j.chmed.2020.05.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 04/04/2020] [Accepted: 05/15/2020] [Indexed: 11/17/2022] Open
Abstract
Objective To explore the effect of age on Qingkailing Granules disposition by comparing the pharmacokinetics of geniposide and baicalin in juvenile and adult rats. Methods A simple and rapid LC-MS/MS method was developed and validated to simultaneously determine geniposide and baicalin in rat plasma after a simple protein precipitation. The analytes were separated on an Agilent ZORBAX Extend-C18 column. The mobile phase consisted of acetonitrile and water with 0.1% (volume percent) formic acid at a flow rate of 0.6 mL/min. The ionization was conducted using an ESI source in negative ion mode. Multiple reaction monitoring was used for quantification at transitions of m/z 445.0 → m/z 268.9 for baicalin, m/z 433.2 → m/z 225.0 for geniposide, m/z 431.0 → m/z 341.0 for vitexin (IS). Juvenile and adult rats were administrated Qingkailing Granules (3 g/kg) orally. Plasma concentrations of baicalin and geniposide were determined by LC-MS/MS. Results The linear ranges of the analytes were 1–1000 ng/mL for baicalin and 2–2000 ng/mL for geniposide. The method was successfully applied to compare the pharmacokinetics of the analytes between juvenile and adult rats after oral administration of Qingkailing Granules. AUC was bigger in adult rats, while t1/2 was longer in juvenile rats. Conclusion These results suggested that the absorption and elimination of baicalin and geniposide in juvenile rats was lower than that in adult rats. Additional attention should be paid to the pharmacokinetic difference when Qingkailing Granules were used in children.
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Affiliation(s)
- Ting-yu Li
- Department of Pharmacy, Dalian Children’s Hospital of Dalian Medical University, Dalian 116012, China
| | - Zhong Li
- Department of Pharmacy, Dalian Children’s Hospital of Dalian Medical University, Dalian 116012, China
| | - Xiao-yan Yang
- Department of Pharmacy, Dalian Children’s Hospital of Dalian Medical University, Dalian 116012, China
| | - Xin-yu Zhao
- College of Pharmacy, Dalian Medical University, Dalian 116044, China
| | - Xu Zhang
- Department of Pharmacy, Dalian Children’s Hospital of Dalian Medical University, Dalian 116012, China
| | - Xin-bo Zhao
- Department of Pharmacy, Dalian Children’s Hospital of Dalian Medical University, Dalian 116012, China
| | - Song Wang
- Department of Pharmacy, Dalian Children’s Hospital of Dalian Medical University, Dalian 116012, China
| | - Xiao-kui Huo
- College of Pharmacy, Dalian Medical University, Dalian 116044, China
- Corresponding authors.
| | - Xiao-ping Shi
- Department of Pharmacy, Dalian Children’s Hospital of Dalian Medical University, Dalian 116012, China
- Corresponding authors.
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Balyan R, Dong M, Pilipenko V, Geisler K, Vinks AA, Chidambaran V. Hydromorphone population pharmacokinetics in pediatric surgical patients. Paediatr Anaesth 2020; 30:1091-1101. [PMID: 32702184 DOI: 10.1111/pan.13975] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 07/09/2020] [Accepted: 07/13/2020] [Indexed: 11/28/2022]
Abstract
BACKGROUND Hydromorphone is an opioid agonist used for pediatric analgesia. Due to lack of data, pediatric dosing (based on adult pharmacokinetic models) is not optimal. AIM This study characterizes hydromorphone population pharmacokinetics in pediatric surgical patients. METHODS In this prospective observational study, 34 children (4-18 years, bodyweight 23-89.6 kg) received multiple intravenous hydromorphone boluses followed by postoperative hydromorphone patient-controlled analgesia. Arterial blood samples were collected before and at 3, 10, 30, and 90 (and few samples at 1350) minutes after the first dose. Hydromorphone concentrations were measured by validated LC-MS/MS assay. Nonlinear mixed-effects modeling was used for pharmacokinetic model development. The final population pharmacokinetic model was evaluated by visual predictive check and bootstrap analysis. Monte Carlo simulations based on the final pharmacokinetic model determined optimal patient-controlled analgesia parameters to achieve a target of 20 ng/mL (as the median effective analgesic concentration), using minimum effective analgesic concentration of 4 ng/mL as a proxy for patient-controlled analgesia dose demand, and not exceeding the defined safe upper threshold of 40 ng/mL. RESULTS Hydromorphone pharmacokinetic profiles were adequately described by a two-compartmental model with first-order elimination. Bodyweight was found to be a significant covariate for hydromorphone clearance. Allometrically scaledpharmacokinetic parameter estimates (per 70 kg), systemic clearance (0.748 L/min), volume of distribution (33 L), peripheral clearance (1.57 L/min), and peripheral volume of distribution (146 L) were similar to reported adult parameter estimates. Sex, race, age, and type of surgery were not identified as significant covariates. To identify optimal patient-controlled analgesia dosing parameters, we simulated several initial loading doses, demand doses, and lockout intervals. Our simulations support an initial patient-controlled analgesia loading dose of 15 µg/kg followed by a demand dose of 6 µg/kg with lockout intervals of 20 minutes. CONCLUSIONS After intravenous hydromorphone, plasma pharmacokinetic profiles in children undergoing different surgeries were well described by a two-compartment population allometric pharmacokinetic model using bodyweight as the size descriptor. Model informed simulations identified patient-controlled analgesia parameters to inform initial settings, with adjustments as needed based on observed individual effects.
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Affiliation(s)
- Rajiv Balyan
- Department of Anesthesia, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.,Division of Clinical Pharmacology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.,Certara Strategic Consulting, Jenkintown, PA, USA
| | - Min Dong
- Division of Clinical Pharmacology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.,Department of Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, OH, USA
| | - Valentina Pilipenko
- Division of Human Genetics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - Kristie Geisler
- Department of Anesthesia, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - Alexander A Vinks
- Division of Clinical Pharmacology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.,Department of Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, OH, USA
| | - Vidya Chidambaran
- Department of Anesthesia, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.,Department of Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, OH, USA
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44
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Poinsignon V, Faivre L, Nguyen L, Neven B, Broutin S, Moshous D, Bourget P, Dufour C, Dalle JH, Galambrun C, Devictor B, Kemmel V, De Berranger E, Gandemer V, Vannier JP, Jubert C, Bondu S, Mir O, Petain A, Vassal G, Paci A. New dosing nomogram and population pharmacokinetic model for young and very young children receiving busulfan for hematopoietic stem cell transplantation conditioning. Pediatr Blood Cancer 2020; 67:e28603. [PMID: 32706505 DOI: 10.1002/pbc.28603] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 06/09/2020] [Accepted: 07/05/2020] [Indexed: 12/13/2022]
Abstract
BACKGROUND Busulfan (Bu) is the cornerstone of conditioning regimens prior to hematopoietic stem cell transplantation, widely used in both adults and children for the treatment of malignant and nonmalignant diseases. Despite an intravenous formulation, interindividual variability (IIV) remains high and optimal exposure difficult to achieve, especially in neonates and infants. PROCEDURE To ensure both efficacy and safety, we set up in 2005 an observational study designed for children not fully assessed during the drug registration procedure. From a large cohort of 540 patients, we developed a Bu population pharmacokinetic model based on body weight (BW) and maturation concepts to reduce IIV and optimize exposure. A new dosing nomogram was evaluated to better fit the population pharmacokinetic model. RESULTS Bu clearance IIV was significantly decreased from 61.3% (covariate-free model) to 28.6% when combining BW and maturation function. Median Bu area under the curve (AUC) was 1179 µmol/L × min compared to 1025 with the EMA dosing nomogram for children <9 kg. The target AUC was reached for each BW strata, significantly increasing the percentages of patients achieving reaching the targeted AUC as compared to FDA schedule. CONCLUSION This new model made it possible to propose a novel dosing nomogram that better considered children below 16 kg of BW and allowed better initial exposure as compared to existing dosing schedules. This nomogram, which would be easy to use to determine an optimal dosing schedule in daily practice, will need to be validated in clinical routine. Therapeutic drug monitoring remains strongly advisable for small children and those with specific diseases.
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Affiliation(s)
- Vianney Poinsignon
- Département de Biologie et Pathologie Médicale, Service de Pharmacologie, Gustave Roussy, Villejuif, France
| | - Laura Faivre
- Département de Biostatistiques, Gustave Roussy, Villejuif, France
| | - Laurent Nguyen
- Clinical Pharmacokinetics Department, Pierre Fabre Research Institute, Toulouse, France
| | - Benedicte Neven
- Pediatric Immunology and Hematology Department, Hôpital Necker Enfants-Malades, Paris, France
| | - Sophie Broutin
- Département de Biologie et Pathologie Médicale, Service de Pharmacologie, Gustave Roussy, Villejuif, France
| | - Despina Moshous
- Pediatric Immunology and Hematology Department, Hôpital Necker Enfants-Malades, Paris, France
| | - Philippe Bourget
- Pharmacy Department, Hôpital Necker Enfants-Malades, Paris, France
| | - Christelle Dufour
- Département de Cancérologie de l'enfant et l'adolescent, Gustave Roussy, Villejuif, France
| | | | - Claire Galambrun
- Department of Pediatric Hematology, La Timone Hospital, Marseille, France
| | | | - Veronique Kemmel
- Biology Department, Strasbourg Universitary Hospital, Strasbourg, France
| | - Eva De Berranger
- Department of Pediatrics, University Children's Hospital, Lille, France
| | - Virginie Gandemer
- Department of Paediatric Haematology/Oncology, University Hospital of Rennes, Rennes, France
| | - Jean Pierre Vannier
- Paediatric Oncology and Haematology Unit, Charles Nicolle Rouen University Hospital, Rouen, France
| | - Charlotte Jubert
- Department of Pediatric Oncology and Hematology, Hôpital Pellegrin, Bordeaux, France
| | - Sabrina Bondu
- Département de Biologie et Pathologie Médicale, Service de Pharmacologie, Gustave Roussy, Villejuif, France
| | - Olivier Mir
- Département de Biologie et Pathologie Médicale, Service de Pharmacologie, Gustave Roussy, Villejuif, France
| | - Aurelie Petain
- Clinical Pharmacokinetics Department, Pierre Fabre Research Institute, Toulouse, France
| | - Gilles Vassal
- Direction de la Recherche, Gustave Roussy, Villejuif, France
| | - Angelo Paci
- Département de Biologie et Pathologie Médicale, Service de Pharmacologie, Gustave Roussy, Villejuif, France.,Université Paris-Saclay, School of Pharmacy, F-92296, Chatenay-Malabry, France
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45
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van Groen BD, Allegaert K, Tibboel D, de Wildt SN. Innovative approaches and recent advances in the study of ontogeny of drug metabolism and transport. Br J Clin Pharmacol 2020; 88:4285-4296. [PMID: 32851677 PMCID: PMC9545189 DOI: 10.1111/bcp.14534] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 08/10/2020] [Accepted: 08/16/2020] [Indexed: 11/30/2022] Open
Abstract
The disposition of a drug is driven by various processes, such as drug metabolism, drug transport, glomerular filtration and body composition. These processes are subject to developmental changes reflecting growth and maturation along the paediatric continuum. However, knowledge gaps exist on these changes and their clinical impact. Filling these gaps may aid better prediction of drug disposition and creation of age-appropriate dosing guidelines. We present innovative approaches to study these developmental changes in relation to drug metabolism and transport. First, analytical methods such as including liquid chromatography-mass spectrometry for proteomic analyses allow quantitation of the expressions of a wide variety of proteins, e.g. membrane transporters, in a small piece of organ tissue. The latter is specifically important for paediatric research, where tissues are scarcely available. Second, innovative study designs using radioactive labelled microtracers allowed study-without risk for the child-of the oral bioavailability of compounds used as markers for certain drug metabolism pathways. Third, the use of modelling and simulation to support dosing recommendations for children is supported by both the European Medicines Agency and the US Food and Drug Administration. This may even do away with the need for a paediatric trial. Physiologically based pharmacokinetics models, which include age-specific physiological information are, therefore, increasingly being used, not only to aid paediatric drug development but also to improve existing drug therapies.
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Affiliation(s)
- Bianca D van Groen
- Intensive Care and Department of Pediatric Surgery, Erasmus MC-Sophia Children's Hospital, Rotterdam, the Netherlands
| | - Karel Allegaert
- Department of Development and Regeneration, KU Leuven, Leuven, Belgium.,Department of Pharmacy and Pharmaceutical Sciences, KU Leuven, Leuven, Belgium.,Department of Clinical Pharmacy, Erasmus MC, Rotterdam, the Netherlands
| | - Dick Tibboel
- Intensive Care and Department of Pediatric Surgery, Erasmus MC-Sophia Children's Hospital, Rotterdam, the Netherlands
| | - Saskia N de Wildt
- Intensive Care and Department of Pediatric Surgery, Erasmus MC-Sophia Children's Hospital, Rotterdam, the Netherlands.,Department of Pharmacology and Toxicology, Radboud Institute of Health Sciences, Radboud University Medical Center, Nijmegen, the Netherlands
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46
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Bollen PDJ, Moore CL, Mujuru HA, Makumbi S, Kekitiinwa AR, Kaudha E, Parker A, Musoro G, Nanduudu A, Lugemwa A, Amuge P, Hakim JG, Rojo P, Giaquinto C, Colbers A, Gibb DM, Ford D, Turkova A, Burger DM. Simplified dolutegravir dosing for children with HIV weighing 20 kg or more: pharmacokinetic and safety substudies of the multicentre, randomised ODYSSEY trial. Lancet HIV 2020; 7:e533-e544. [PMID: 32763217 PMCID: PMC7445428 DOI: 10.1016/s2352-3018(20)30189-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 05/04/2020] [Accepted: 05/04/2020] [Indexed: 04/14/2023]
Abstract
BACKGROUND Paediatric dolutegravir doses approved by stringent regulatory authorities (SRAs) for children weighing 20 kg to less than 40 kg until recently required 25 mg and 10 mg film-coated tablets. These tablets are not readily available in low-resource settings where the burden of HIV is highest. We did nested pharmacokinetic substudies in patients enrolled in the ODYSSEY-trial to evaluate simplified dosing in children with HIV. METHODS We did pharmacokinetic and safety substudies within the open-label, multicentre, randomised ODYSSEY trial (NCT02259127) of children with HIV starting treatment in four research centres in Uganda and Zimbabwe. Eligible children were randomised to dolutegravir in ODYSSEY and weighed 20 kg to less than 40 kg. In children weighing 20 kg to less than 25 kg, we assessed dolutegravir's pharmacokinetics in children given once daily 25 mg film-coated tablets (approved by the SRAs at the time of the study) in part one of the study, and 50 mg film-coated tablets (adult dose) or 30 mg dispersible tablets in part two of the study. In children weighing 25 kg to less than 40 kg, we also assessed dolutegravir pharmacokinetics within-subject on film-coated tablet doses of 25 mg or 35 mg once daily, which were approved by the SRAs for the children's weight band; then switched to 50 mg film-coated tablets once daily. Steady-state 24 h dolutegravir plasma concentration-time pharmacokinetic profiling was done in all enrolled children at baseline and 1, 2, 3, 4, 6, and 24 h after observed dolutegravir intake. Target dolutegravir trough concentrations (Ctrough) were based on reference adult pharmacokinetic data and safety was evaluated in all children in the corresponding weight bands who consented to pharmacokinetic studies and received the studied doses. FINDINGS Between Sept 22, 2016, and May 31, 2018, we enrolled 62 black-African children aged from 6 years to younger than 18 years (84 pharmacokinetic-profiles). In children weighing 20 kg to less than 25 kg taking 25 mg film-coated tablets, the geometric mean (GM) Ctrough (coefficient of variation) was 0·32 mg/L (94%), which was 61% lower than the GM Ctrough of 0·83 mg/L (26%) in fasted adults on dolutegravir 50 mg once-daily; in children weighing 25 kg to less than 30 kg taking 25 mg film-coated tablets, the GM Ctrough was 0·39 mg/L (48%), which was 54% lower than the GM Ctrough in fasted adults; and in those 30 kg to less than 40 kg taking 35 mg film-coated tablets the GM Ctrough was 0·46 mg/L (63%), which was 45% lower than the GM Ctrough in fasted adults. On 50 mg film-coated tablets or 30 mg dispersible tablets, Ctrough was close to the adult reference (with similar estimates on the two formulations in children in the 20 to <25 kg weight band), with total exposure (area under the concentration-time curve from 0 h to 24 h) in between reference values in adults dosed once and twice daily, where safety data are reassuring, although maximum concentrations were higher in children weighing 20 kg to less than 25 kg than in the twice-daily adult reference. Over a 24-week follow-up period in 47 children on 30 mg dispersible tablets or 50 mg film-coated tablets, none of the three reported adverse events (cryptococcal meningitis, asymptomatic anaemia, and asymptomatic neutropenia) were considered related to dolutegravir. INTERPRETATION Adult dolutegravir 50 mg film-coated tablets given once daily provide appropriate pharmacokinetic profiles in children weighing 20 kg or more, with no safety signal, allowing simplified practical dosing and rapid access to dolutegravir. These results informed the WHO 2019 dolutegravir paediatric dosing guidelines and have led to US Food and Drug Administration approval of adult dosing down to 20 kg. FUNDING Paediatric European Network for Treatment of AIDS Foundation, ViiV Healthcare, UK Medical Research Council.
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Affiliation(s)
- Pauline D J Bollen
- Department of Pharmacy, Radboud Institute for Health Sciences, Radboud university medical center, Nijmegen, Netherlands
| | - Cecilia L Moore
- Medical Research Council Clinical Trials Unit, University College London, London, UK
| | - Hilda A Mujuru
- University of Zimbabwe Clinical Research Centre, Harare, Zimbabwe
| | | | | | | | - Anna Parker
- Medical Research Council Clinical Trials Unit, University College London, London, UK
| | - Godfrey Musoro
- University of Zimbabwe Clinical Research Centre, Harare, Zimbabwe
| | | | | | - Pauline Amuge
- Baylor College of Medicine Children's Foundation, Kampala, Uganda
| | - James G Hakim
- University of Zimbabwe Clinical Research Centre, Harare, Zimbabwe
| | | | | | - Angela Colbers
- Department of Pharmacy, Radboud Institute for Health Sciences, Radboud university medical center, Nijmegen, Netherlands.
| | - Diana M Gibb
- Medical Research Council Clinical Trials Unit, University College London, London, UK
| | - Deborah Ford
- Medical Research Council Clinical Trials Unit, University College London, London, UK
| | - Anna Turkova
- Medical Research Council Clinical Trials Unit, University College London, London, UK
| | - David M Burger
- Department of Pharmacy, Radboud Institute for Health Sciences, Radboud university medical center, Nijmegen, Netherlands
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Transcutaneous carbon dioxide measurements in fruits, vegetables and humans: A prospective observational study. Eur J Anaesthesiol 2020; 36:904-910. [PMID: 31464713 DOI: 10.1097/eja.0000000000001073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
BACKGROUND Transcutaneous carbon dioxide measurement (TcCO2) is frequently used as a surrogate for arterial blood gas sampling in adults and children with critical illness. Data from noninvasive TcCO2 monitoring assists with clinical decisions regarding mechanical ventilation settings, estimation of metabolic consumption and determination of adequate end-organ tissue perfusion. OBJECTIVES To report TcCO2 values obtained from various fruits, vegetables and elite critical care medicine specialists. DESIGN Prospective, observational, nonblinded cohort study. SETTINGS Single-centre, tertiary paediatric referral centre and organic farmers' market. PARTICIPANTS Vegetables and fruits included 10 samples of each of the following: red delicious apple (Malus domestica), manzano banana (Musa sapientum), key lime (Citrus aurantiifolia), miniature sweet bell pepper (Capsicum annuum), sweet potato (Ipomoea batatas) and avocado (Persea americana). Ten human controls were studied including a paediatric intensivist, a paediatric inpatient hospital physician, four paediatric resident physicians and four paediatric critical care nurses. INTERVENTIONS None. MAIN OUTCOME MEASURES TcCO2 values for each species and device response times. RESULTS TcCO2 readings were measurable in all study species except the sweet potato. Mean ± SD values of TcCO2 for human controls [4.34 ± 0.37 kPa (32.6 ± 2.8 mmHg)] were greater than apples [3.09 ± 0.19 kPa (23.2 ± 1.4 mmHg), P < 0.01], bananas [2.73 ± 0.28 kPa (20.5 ± 2.1 mmHg), P < 0.01] and limes [2.76 ± 0.52 kPa (20.7 ± 3.9 mmHg), P < 0.01] but no different to those of avocados [4.29 ± 0.44 kPa (32.2 ± 3.3 mmHg), P = 0.77] and bell peppers [4.19 ± 1.13 kPa (31.4 ± 8.5 mmHg), P = 0.68]. Transcutaneous response times did not differ between research cohorts and human controls. CONCLUSION We found nonroot, nontuberous vegetables to have TcCO2 values similar to that of healthy, human controls. Fruits yield TcCO2 readings, but substantially lower than human controls.
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48
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Maharaj AR, Wu H, Hornik CP, Arrieta A, James L, Bhatt-Mehta V, Bradley J, Muller WJ, Al-Uzri A, Downes KJ, Cohen-Wolkowiez M. Use of normalized prediction distribution errors for assessing population physiologically-based pharmacokinetic model adequacy. J Pharmacokinet Pharmacodyn 2020; 47:199-218. [PMID: 32323049 PMCID: PMC7293575 DOI: 10.1007/s10928-020-09684-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 03/27/2020] [Indexed: 12/19/2022]
Abstract
Currently employed methods for qualifying population physiologically-based pharmacokinetic (Pop-PBPK) model predictions of continuous outcomes (e.g., concentration-time data) fail to account for within-subject correlations and the presence of residual error. In this study, we propose a new method for evaluating Pop-PBPK model predictions that account for such features. The approach focuses on deriving Pop-PBPK-specific normalized prediction distribution errors (NPDE), a metric that is commonly used for population pharmacokinetic model validation. We describe specific methodological steps for computing NPDE for Pop-PBPK models and define three measures for evaluating model performance: mean of NPDE, goodness-of-fit plots, and the magnitude of residual error. Utility of the proposed evaluation approach was demonstrated using two simulation-based study designs (positive and negative control studies) as well as pharmacokinetic data from a real-world clinical trial. For the positive-control simulation study, where observations and model simulations were generated under the same Pop-PBPK model, the NPDE-based approach denoted a congruency between model predictions and observed data (mean of NPDE = - 0.01). In contrast, for the negative-control simulation study, where model simulations and observed data were generated under different Pop-PBPK models, the NPDE-based method asserted that model simulations and observed data were incongruent (mean of NPDE = - 0.29). When employed to evaluate a previously developed clindamycin PBPK model against prospectively collected plasma concentration data from 29 children, the NPDE-based method qualified the model predictions as successful (mean of NPDE = 0). However, when pediatric subpopulations (e.g., infants) were evaluated, the approach revealed potential biases that should be explored.
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Affiliation(s)
- Anil R Maharaj
- Duke Clinical Research Institute, Duke University School of Medicine, Durham, NC, USA
| | - Huali Wu
- Duke Clinical Research Institute, Duke University School of Medicine, Durham, NC, USA
| | - Christoph P Hornik
- Duke Clinical Research Institute, Duke University School of Medicine, Durham, NC, USA
- Department of Pediatrics, Duke University School of Medicine, Durham, NC, USA
| | - Antonio Arrieta
- Children's Hospital of Orange County Research Institute, Orange, CA, USA
| | - Laura James
- Arkansas Children's Hospital Research Center, Little Rock, AR, USA
- University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Varsha Bhatt-Mehta
- University of Michigan College of Pharmacy and Michigan Medicine, Ann Arbor, MI, USA
| | - John Bradley
- Rady Children's Hospital and Health Center, San Diego, CA, USA
| | - William J Muller
- Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, USA
| | - Amira Al-Uzri
- Oregon Health and Science University, Portland, OR, USA
| | - Kevin J Downes
- Division of Infectious Diseases, Children's Hospital of Philadelphia, Philadelphia, PA, USA
- Department of Pediatrics, Perelman School of Medicine of the University of Pennsylvania, Philadelphia, PA, USA
| | - Michael Cohen-Wolkowiez
- Duke Clinical Research Institute, Duke University School of Medicine, Durham, NC, USA.
- Department of Pediatrics, Duke University School of Medicine, Durham, NC, USA.
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49
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Linakis MW, Rower JE, Sorenson S, Reilly CA, Lambert LM, Williams RV, Burch PT. Stability of Oxandrolone in Medium-Chain Triglyceride Oil and Pharmacokinetics Following Buccal Administration of the Extemporaneous Formulation in Neonates and Adults. J Pediatr Pharmacol Ther 2020; 25:220-227. [DOI: 10.5863/1551-6776-25.3.220] [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 Growth failure following surgical palliation of complex congenital heart defects (CHDs) is a prognosticator of poor outcomes. Many strategies for improving weight gain have been implemented in this population, with limited success. We recently described the potential of the anabolic steroid oxandrolone to improve weight gain following surgical repair of CHD when administered via a medium-chain triglyceride (MCT) oil suspension to the buccal mucosa. The current study evaluates the stability of oxandrolone in the MCT oil formulation, as well as the pharmacokinetics of oxandrolone when administered via buccal mucosa in both neonates and adults.METHODS Stability was assessed by long-term storage of the preparation 1) at ambient conditions and 2) under photodegradative conditions for 3 days. Neonatal pharmacokinetic parameters were determined in a cohort of neonates following surgical CHD repair, whereas adult pharmacokinetics parameters were collected as part of a prospective study to evaluate the relative bioavailability of the oxandrolone in MCT oil formulation.RESULTS We found that oxandrolone was stable in the MCT oil formulation for at least 1 month, although exposure to light hastened drug degradation. Both neonatal and adult oxandrolone pharmacokinetics were variable; however, oxandrolone in MCT oil was relatively well absorbed through the buccal mucosa (mean bioavailability = 62.5%).CONCLUSIONS These data suggest that the variability in oxandrolone exposures is inherent to the drug, and not the formulation or route of administration. Combined, these data support further study of this novel oxandrolone in MCT oil formulation and its impact on growth following complex surgical repair of CHD in neonates.
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50
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Germovsek E, Barker CIS, Sharland M, Standing JF. Pharmacokinetic-Pharmacodynamic Modeling in Pediatric Drug Development, and the Importance of Standardized Scaling of Clearance. Clin Pharmacokinet 2020; 58:39-52. [PMID: 29675639 PMCID: PMC6325987 DOI: 10.1007/s40262-018-0659-0] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Pharmacokinetic/pharmacodynamic (PKPD) modeling is important in the design and conduct of clinical pharmacology research in children. During drug development, PKPD modeling and simulation should underpin rational trial design and facilitate extrapolation to investigate efficacy and safety. The application of PKPD modeling to optimize dosing recommendations and therapeutic drug monitoring is also increasing, and PKPD model-based dose individualization will become a core feature of personalized medicine. Following extensive progress on pediatric PK modeling, a greater emphasis now needs to be placed on PD modeling to understand age-related changes in drug effects. This paper discusses the principles of PKPD modeling in the context of pediatric drug development, summarizing how important PK parameters, such as clearance (CL), are scaled with size and age, and highlights a standardized method for CL scaling in children. One standard scaling method would facilitate comparison of PK parameters across multiple studies, thus increasing the utility of existing PK models and facilitating optimal design of new studies.
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Affiliation(s)
- Eva Germovsek
- Infection, Inflammation and Rheumatology Section, UCL Great Ormond Street Institute of Child Heath, University College London, London, UK. .,Pharmacometrics Research Group, Department of Pharmaceutical Biosciences, Uppsala University, PO Box 591, 751 24, Uppsala, Sweden.
| | - Charlotte I S Barker
- Infection, Inflammation and Rheumatology Section, UCL Great Ormond Street Institute of Child Heath, University College London, London, UK.,Paediatric Infectious Diseases Research Group, Institute for Infection and Immunity, St George's, University of London, London, UK.,St George's University Hospitals NHS Foundation Trust, London, UK
| | - Mike Sharland
- Paediatric Infectious Diseases Research Group, Institute for Infection and Immunity, St George's, University of London, London, UK.,St George's University Hospitals NHS Foundation Trust, London, UK
| | - Joseph F Standing
- Infection, Inflammation and Rheumatology Section, UCL Great Ormond Street Institute of Child Heath, University College London, London, UK.,Paediatric Infectious Diseases Research Group, Institute for Infection and Immunity, St George's, University of London, London, UK
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