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Blouin M, Métras MÉ, El Hassani M, Yaliniz A, Marsot A. Optimization of Vancomycin Initial Dosing Regimen in Neonates Using an Externally Evaluated Population Pharmacokinetic Model. Ther Drug Monit 2024:00007691-990000000-00235. [PMID: 38857472 DOI: 10.1097/ftd.0000000000001226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Accepted: 03/27/2024] [Indexed: 06/12/2024]
Abstract
BACKGROUND Vancomycin therapeutic monitoring guidelines were revised in March 2020, and a population pharmacokinetics-guided Bayesian approach to estimate the 24-hour area under the concentration-time curve to the minimum inhibitory concentration ratio has since been recommended instead of trough concentrations. To comply with these latest guidelines, we evaluated published population pharmacokinetic models of vancomycin using an external dataset of neonatal patients and selected the most predictive model to develop a new initial dosing regimen. METHODS The models were identified from the literature and tested using a retrospective dataset of Canadian neonates. Their predictive performance was assessed using prediction- and simulation-based diagnostics. Monte Carlo simulations were performed to develop the initial dosing regimen with the highest probability of therapeutic target attainment. RESULTS A total of 144 vancomycin concentrations were derived from 63 neonates in the external population. Five of the 28 models retained for evaluation were found predictive with a bias of 15% and an imprecision of 30%. Overall, the Grimsley and Thomson model performed best, with a bias of -0.8% and an imprecision of 20.9%; therefore, it was applied in the simulations. A novel initial dosing regimen of 15 mg/kg, followed by 11 mg/kg every 8 hours should favor therapeutic target attainment. CONCLUSIONS A predictive population pharmacokinetic model of vancomycin was identified after an external evaluation and used to recommend a novel initial dosing regimen. The implementation of these model-based tools may guide physicians in selecting the most appropriate initial vancomycin dose, leading to improved clinical outcomes.
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Affiliation(s)
- Mathieu Blouin
- STP Laboratory, Faculty of Pharmacy, Université de Montréal, Montréal (QC), Canada
- Faculty of Pharmacy, Université de Montréal, Montréal (QC), Canada
| | - Marie-Élaine Métras
- Faculty of Pharmacy, Université de Montréal, Montréal (QC), Canada
- Department of Pharmacy, Centre Hospitalier Universitaire Sainte-Justine, Montréal (QC), Canada; and
| | - Mehdi El Hassani
- STP Laboratory, Faculty of Pharmacy, Université de Montréal, Montréal (QC), Canada
- Faculty of Pharmacy, Université de Montréal, Montréal (QC), Canada
| | - Aysenur Yaliniz
- STP Laboratory, Faculty of Pharmacy, Université de Montréal, Montréal (QC), Canada
- Faculty of Pharmacy, Université de Montréal, Montréal (QC), Canada
| | - Amélie Marsot
- STP Laboratory, Faculty of Pharmacy, Université de Montréal, Montréal (QC), Canada
- Faculty of Pharmacy, Université de Montréal, Montréal (QC), Canada
- Research Center, Centre Hospitalier Universitaire Sainte-Justine, Montréal (QC), Canada
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2
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Blank M, Wilson RC, Wan Y, Peters J, Davies F, Tyszczuk L, Pichon B, Riezk A, Demirjian A, Brown CS, Gilchrist M, Holmes AH, Rawson TM. Exploring real-world vancomycin target attainment in neonatal intensive care in the context of Staphylococcal infections: a retrospective observational cohort study. J Infect 2024; 89:106191. [PMID: 38848967 DOI: 10.1016/j.jinf.2024.106191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2024] [Accepted: 05/29/2024] [Indexed: 06/09/2024]
Affiliation(s)
- Michael Blank
- Imperial College Healthcare NHS Trust, Hammersmith Hospital, Du Cane Road, London W12 0HS. United Kingdom.
| | - Richard C Wilson
- Imperial College Healthcare NHS Trust, Hammersmith Hospital, Du Cane Road, London W12 0HS. United Kingdom; National Institute for Health Research Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance, Department for Infectious Disease, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN. United Kingdom; Centre for Antimicrobial Optimisation, Imperial College London, Hammersmith Hospital, Du Cane Road, London W12 0NN, United Kingdom; David Price Evans Infectious Diseases & Global Health Group, The University of Liverpool, Liverpool L7 8TX, United Kingdom
| | - Yu Wan
- Imperial College Healthcare NHS Trust, Hammersmith Hospital, Du Cane Road, London W12 0HS. United Kingdom; National Institute for Health Research Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance, Department for Infectious Disease, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN. United Kingdom; Healthcare-Associated Infection (HCAI), Fungal, Antimicrobial Resistance (AMR), Antimicrobial Use (AMU) & Sepsis Division, UK Health Security Agency (UKHSA), 61 Colindale Avenue London NW9 5EQ, United Kingdom
| | - Joanna Peters
- Imperial College Healthcare NHS Trust, Hammersmith Hospital, Du Cane Road, London W12 0HS. United Kingdom
| | - Frances Davies
- Imperial College Healthcare NHS Trust, Hammersmith Hospital, Du Cane Road, London W12 0HS. United Kingdom; National Institute for Health Research Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance, Department for Infectious Disease, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN. United Kingdom
| | - Lidia Tyszczuk
- Imperial College Healthcare NHS Trust, Hammersmith Hospital, Du Cane Road, London W12 0HS. United Kingdom
| | - Bruno Pichon
- Healthcare-Associated Infection (HCAI), Fungal, Antimicrobial Resistance (AMR), Antimicrobial Use (AMU) & Sepsis Division, UK Health Security Agency (UKHSA), 61 Colindale Avenue London NW9 5EQ, United Kingdom
| | - Alaa Riezk
- National Institute for Health Research Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance, Department for Infectious Disease, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN. United Kingdom; Centre for Antimicrobial Optimisation, Imperial College London, Hammersmith Hospital, Du Cane Road, London W12 0NN, United Kingdom
| | - Alicia Demirjian
- National Institute for Health Research Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance, Department for Infectious Disease, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN. United Kingdom; Healthcare-Associated Infection (HCAI), Fungal, Antimicrobial Resistance (AMR), Antimicrobial Use (AMU) & Sepsis Division, UK Health Security Agency (UKHSA), 61 Colindale Avenue London NW9 5EQ, United Kingdom; Department of Paediatric Infectious Disease & Immunology, Evelina London Children's Hospital, London, UK; Faculty of Life Sciences & Medicine, Kings College London, London, UK; Faculty of Medicine, Imperial College London, London, UK
| | - Colin Stewart Brown
- Healthcare-Associated Infection (HCAI), Fungal, Antimicrobial Resistance (AMR), Antimicrobial Use (AMU) & Sepsis Division, UK Health Security Agency (UKHSA), 61 Colindale Avenue London NW9 5EQ, United Kingdom
| | - Mark Gilchrist
- Imperial College Healthcare NHS Trust, Hammersmith Hospital, Du Cane Road, London W12 0HS. United Kingdom; National Institute for Health Research Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance, Department for Infectious Disease, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN. United Kingdom; Centre for Antimicrobial Optimisation, Imperial College London, Hammersmith Hospital, Du Cane Road, London W12 0NN, United Kingdom
| | - Alison H Holmes
- National Institute for Health Research Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance, Department for Infectious Disease, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN. United Kingdom; Centre for Antimicrobial Optimisation, Imperial College London, Hammersmith Hospital, Du Cane Road, London W12 0NN, United Kingdom; David Price Evans Infectious Diseases & Global Health Group, The University of Liverpool, Liverpool L7 8TX, United Kingdom
| | - Timothy Miles Rawson
- National Institute for Health Research Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance, Department for Infectious Disease, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN. United Kingdom; Centre for Antimicrobial Optimisation, Imperial College London, Hammersmith Hospital, Du Cane Road, London W12 0NN, United Kingdom; David Price Evans Infectious Diseases & Global Health Group, The University of Liverpool, Liverpool L7 8TX, United Kingdom
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3
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Pitayakittiwong C, Sermsappasuk P, Meesing A, Jaisue S. Association of Vancomycin AUC/MIC and Trough Concentration With Early Clinical Response in Enterococcus or Coagulase-Negative Staphylococcus Infection: A Prospective Study. J Clin Pharmacol 2024. [PMID: 38639115 DOI: 10.1002/jcph.2441] [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: 01/12/2024] [Accepted: 03/20/2024] [Indexed: 04/20/2024]
Abstract
This study was condcuted to examine the association of area under the curve (AUC)/minimum inhibitory concentration (MIC) and trough concentration (Ctrough) of vancomycin with treatment outcome and nephrotoxicity in infections caused by Enterococcus spp. and coagulase-negative Staphylococci (CoNS). Peak and trough concentrations were used to calculate AUC in 89 patients receiving vancomycin for infections with Enterococcus spp. (n = 65) or CoNS (n = 24). Correlations between Ctrough, AUC/MIC, early clinical response (ECR), and nephrotoxicity were assessed and cutoff values were determined. Sixty-three (70.8%) patients showed improvement in ECR and 10 (11.2%) experienced nephrotoxicity. Enterococcus spp. infections displayed correlations between AUC/MIC and ECR for AUC0-24 h/MIC (r2 = 0.27, P ≤ .05) and AUC24-48 h/MIC (r2 = 0.28, P ≤ .05), but not for Ctrough (r2 = 0.21, P > .05). There were no correlations between Ctrough (r2 = 0.26, P > .05), AUC0-24 h/MIC (r2 = -0.12, P > .05), AUC24-48 h/MIC (r2 = 0.01, P > .05) and ECR for CoNS. In the CoNS group, a moderate correlation was found between ECR and Ctrough at a cutoff value of 6.9 μg/mL. In addition, nephrotoxicity is also moderately associated with AUC0-24 h and AUC24-48 h at 505.7 and 667.1 μg•h/mL, respectively. A strong correlation between nephrotoxicity and Ctrough was observed when the cutoff value was 18.9 μg/mL. AUC/MIC during the first 48 h was a determinant of vancomycin efficacy in Enterococcus infections but not for CoNS. Ctrough was not correlated with clinical outcome. Nephrotoxicity could be predicted using Ctrough and AUC for infections with both pathogens.
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Affiliation(s)
| | | | | | - Siriluk Jaisue
- Faculty of Pharmaceutical Sciences, Khon Kaen University, Khon Kaen, Thailand
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Joerger T, Hayes M, Stinson C, Mikhail I, Downes KJ. Incidence of Antimicrobial-Associated Acute Kidney Injury in Children: A Structured Review. Paediatr Drugs 2024; 26:59-70. [PMID: 38093147 PMCID: PMC10983053 DOI: 10.1007/s40272-023-00607-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/08/2023] [Indexed: 01/06/2024]
Abstract
Acute kidney injury (AKI) is a commonly reported adverse effect of administration of antimicrobials. While AKI can be associated with poorer outcomes, there is little information available to understand rates of AKI in children exposed to various antimicrobials. We performed a structured review using the PubMed and Embase databases. Articles were included if they provided an AKI definition in patients who were < 19 years of age receiving an antimicrobial and reported the frequency of AKI. Author-defined AKI rates were calculated for each study and mean pooled estimates for each antimicrobial were derived from among all study participants. Pooled estimates were also derived for those studies that reported AKI according to pRIFLE (pediatric risk, injury, failure, loss, end stage criteria), AKIN (acute kidney injury network), or KDIGO (kidney disease improving global outcomes) creatinine criteria. A total of 122 studies evaluating 28 antimicrobials met the inclusion criteria. Vancomycin was the most commonly studied drug: 11,514 courses across 44 included studies. Among the 27,285 antimicrobial exposures, the overall AKI rate was 13.2% (range 0-42.1% by drug), but the rate of AKI varied widely across studies (range 0-68.8%). Cidofovir (42.1%) and conventional amphotericin B (37.0%) had the highest pooled rates of author-defined AKI. Eighty-one studies used pRIFLE, AKIN, or KDIGO AKI criteria and the pooled rates of AKI were similar to author-defined AKI rates. In conclusion, antimicrobial-associated AKI is reported to occur frequently in children, but the rates of AKI varies widely across studies and drugs. Most published studies examined hospitalized patients and heterogeneity in study populations and in author definitions of AKI are barriers to a comparison of nephrotoxicity risk among antimicrobials in children.
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Affiliation(s)
- Torsten Joerger
- Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
- Division of Infectious Diseases, Children's Hospital of Philadelphia, 3401 Civic Center Blvd, Philadelphia, PA, 19104, USA.
| | - Molly Hayes
- Center for Healthcare Quality and Analytics, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Connor Stinson
- Philadelphia College of Osteopathic Medicine, Philadelphia, PA, USA
| | - Ibram Mikhail
- Division of Infectious Diseases, Children's Hospital of Philadelphia, 3401 Civic Center Blvd, Philadelphia, PA, 19104, USA
| | - Kevin J Downes
- Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Division of Infectious Diseases, Children's Hospital of Philadelphia, 3401 Civic Center Blvd, Philadelphia, PA, 19104, USA
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5
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Zhai X, Tian Y, Zhao K, Liu Z, Chang Y. Effectiveness of a low trough serum concentration of vancomycin on acute kidney injury in infants and toddlers in the paediatric intensive care unit. Eur J Hosp Pharm 2023:ejhpharm-2023-003902. [PMID: 37758318 DOI: 10.1136/ejhpharm-2023-003902] [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: 07/05/2023] [Accepted: 09/05/2023] [Indexed: 10/03/2023] Open
Abstract
OBJECTIVE This study aimed to assess the effectiveness of a low trough serum concentration of vancomycin on acute kidney injury in infants and toddlers in the paediatric intensive care unit (PICU). METHODS A retrospective cohort study was performed of 126 infants and toddlers (aged between 29 days and 3 years) from the PICU of a tertiary care hospital who were administered intravenous vancomycin between January 2019 and December 2022. Information about their demographic factors, duration of PICU stay, time of administration and trough levels of vancomycin were retrieved. Descriptive statistics were used for demographic factors and multivariable logistic regression analyses were conducted to assess the determining factors. RESULTS Based on the trough concentration of vancomycin, the participants were divided into three groups as follows: 4-5 mg/L, 5-15 mg/L and >15 mg/L. The serum vancomycin concentration was significantly related to body weight, albumin, cystatin C, urea nitrogen in serum, serum creatinine and creatinine clearance (p<0.05) in these patients. Multivariate analysis showed that body weight, albumin, cystatin C, urea nitrogen in serum and creatinine clearance were independent contributors to the trough vancomycin concentration. There was no difference in the effectiveness of different trough concentrations on patients (p=0.241). The cumulative incidence of acute kidney injury was highest in the group with a trough concentration of vancomycin >15 mg/L (p<0.01). CONCLUSIONS Patients with a vancomycin trough concentration of 4-5 mg/L in the PICU had a high cure rate (79.4%) and a low incidence of acute kidney injury (HR 18.3, 95% CI 5.135 to 87.621; p<0.001). Therefore, the serum trough concentration should be considered but it should also be combined with the treatment effect to achieve individualised administration for the clinical application of vancomycin.
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Affiliation(s)
- Xin Zhai
- Department of Pharmacy, Northwest Women's and Children's Hospital, Xi'an, Shaanxi, China
| | - Yun Tian
- Department of Clinical Pharmacy, Shaanxi Provincial Cancer Hospital, Xi'an, Shaanxi, China
| | - Kai Zhao
- Department of Pharmacy, Northwest Women's and Children's Hospital, Xi'an, Shaanxi, China
| | - Zhenguo Liu
- Department of Pharmacy, Northwest Women's and Children's Hospital, Xi'an, Shaanxi, China
| | - Ying Chang
- Department of Pharmacy, Northwest Women's and Children's Hospital, Xi'an, Shaanxi, China
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Wang C, Chen J, Yang B, Li S, Zhang Y, Chen L, Wang T, Dong Y. Determination of vancomycin exposure target and individualized dosing recommendations for critically ill patients undergoing continuous renal replacement therapy. Pharmacotherapy 2023; 43:180-188. [PMID: 36714991 DOI: 10.1002/phar.2771] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 12/18/2022] [Accepted: 12/25/2022] [Indexed: 01/31/2023]
Abstract
STUDY OBJECTIVE Few studies have been conducted to quantify the exposure target of vancomycin in intensive care unit (ICU) patients undergoing continuous renal replacement therapy (CRRT) and provide optimized dosage regimens. We aimed to determine vancomycin exposure target and dosing recommendations using data from an open database in critically ill patients undergoing CRRT. DESIGN A retrospective observational cohort study. DATA SOURCE A large public database. PATIENTS The adult patients who received intravenous vancomycin and CRRT treatment in the database between 2017 and 2019 were reviewed to determine eligibility. A total of 180 patients with 1186 observations were included in the population pharmacokinetic (PPK) model development. The clinical efficacy of vancomycin was analyzed in 159 eligible patients. METHODS A PPK model was developed to estimate individual pharmacokinetic (PK) parameters. The area under the concentration-time curve (AUC) was estimated by a Bayesian approach based on individual vancomycin concentrations. Multivariate logistic regression analyses were performed to identify the factors of clinical outcomes. Threshold of vancomycin exposure in predicting efficacy was identified via receiver operating characteristic (ROC) curve. Dosing recommendations were designed using Monte Carlo Simulations (MCS) based on the optimized exposure target. MEASUREMENTS AND MAIN RESULTS On covariate analysis, CRRT intensity significantly affected vancomycin PK. The AUC above 427 mg*h/L was the only significant predictor of clinical efficacy (adjusted odds ratio (aOR): 1.008, 95% confidence interval (CI): 1.004-1.011, p = 0.000). MCS indicated that vancomycin dosage regimens of 5 mg/kg q12h or 7.5 mg/kg q12h were recommended for patients with CRRT intensities of 20-25 mL/kg/h or 25.1-45 mL/kg/h, respectively. CONCLUSIONS An AUC threshold of 427 mg*h/L (assuming the minimal inhibitory concentration (MIC) = 1 mg/L) was a recommended efficacy exposure target of vancomycin for critically ill patients undergoing CRRT. Vancomycin 5-7.5 mg/kg q12h is recommended as the initial dosage regimens for ICU patients undergoing CRRT.
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Affiliation(s)
- Chuhui Wang
- Department of Pharmacy, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Jiaojiao Chen
- Department of Pharmacy, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Bo Yang
- Department of Pharmacy, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Sihan Li
- Department of Pharmacy, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Yiran Zhang
- School of Pharmacy, Xi'an Jiaotong University, Xi'an, China
| | - Lei Chen
- Department of Hemodialysis, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Taotao Wang
- Department of Pharmacy, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Yalin Dong
- Department of Pharmacy, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
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Simeoli R, Cairoli S, Decembrino N, Campi F, Dionisi Vici C, Corona A, Goffredo BM. Use of Antibiotics in Preterm Newborns. Antibiotics (Basel) 2022; 11:antibiotics11091142. [PMID: 36139921 PMCID: PMC9495226 DOI: 10.3390/antibiotics11091142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 08/19/2022] [Accepted: 08/21/2022] [Indexed: 11/16/2022] Open
Abstract
Due to complex maturational and physiological changes that characterize neonates and affect their response to pharmacological treatments, neonatal pharmacology is different from children and adults and deserves particular attention. Although preterms are usually considered part of the neonatal population, they have physiological and pharmacological hallmarks different from full-terms and, therefore, need specific considerations. Antibiotics are widely used among preterms. In fact, during their stay in neonatal intensive care units (NICUs), invasive procedures, including central catheters for parental nutrition and ventilators for respiratory support, are often sources of microbes and require antimicrobial treatments. Unfortunately, the majority of drugs administered to neonates are off-label due to the lack of clinical studies conducted on this special population. In fact, physiological and ethical concerns represent a huge limit in performing pharmacokinetic (PK) studies on these subjects, since they limit the number and volume of blood sampling. Therapeutic drug monitoring (TDM) is a useful tool that allows dose adjustments aiming to fit plasma concentrations within the therapeutic range and to reach specific drug target attainment. In this review of the last ten years’ literature, we performed Pubmed research aiming to summarize the PK aspects for the most used antibiotics in preterms.
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Affiliation(s)
- Raffaele Simeoli
- Division of Metabolic Diseases and Drug Biology, Bambino Gesù Children’s Hospital, IRCCS, 00146 Rome, Italy
| | - Sara Cairoli
- Division of Metabolic Diseases and Drug Biology, Bambino Gesù Children’s Hospital, IRCCS, 00146 Rome, Italy
| | - Nunzia Decembrino
- Neonatal Intensive Care Unit, University Hospital “Policlinico-San Marco” Catania, Integrated Department for Maternal and Child’s Health Protection, 95100 Catania, Italy
| | - Francesca Campi
- Neonatal Intensive Care Unit, Medical and Surgical Department of Fetus-Newborn-Infant, Bambino Gesù Children’s Hospital, IRCCS, 00165 Rome, Italy
| | - Carlo Dionisi Vici
- Division of Metabolic Diseases and Drug Biology, Bambino Gesù Children’s Hospital, IRCCS, 00146 Rome, Italy
| | - Alberto Corona
- ICU and Accident & Emergency Department, ASST Valcamonica, 25043 Breno, Italy
| | - Bianca Maria Goffredo
- Division of Metabolic Diseases and Drug Biology, Bambino Gesù Children’s Hospital, IRCCS, 00146 Rome, Italy
- Correspondence: ; Tel.: +39-0668592174; Fax: + 39-0668593009
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