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Pippa LF, Vozmediano V, Mitrov‐Winkelmolen L, Touw D, Soliman A, Cristofoletti R, Salgado Junior W, de Moraes NV. Impact of obesity and roux-en-Y gastric bypass on the pharmacokinetics of (R)- and (S)-omeprazole and intragastric pH. CPT Pharmacometrics Syst Pharmacol 2024; 13:1528-1541. [PMID: 38923321 PMCID: PMC11533107 DOI: 10.1002/psp4.13189] [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: 01/30/2024] [Revised: 05/30/2024] [Accepted: 06/10/2024] [Indexed: 06/28/2024] Open
Abstract
This study employed physiologically-based pharmacokinetic-pharmacodynamics (PBPK/PD) modeling to predict the effect of obesity and gastric bypass surgery on the pharmacokinetics and intragastric pH following omeprazole treatment. The simulated plasma concentrations closely matched the observed data from non-obese, morbidly obese, and post-gastric bypass populations. Obesity significantly reduces CYP3A4 and CYP2C19 activities, as reflected by the metabolic ratio [omeprazole sulphone]/[omeprazole] and [5-hydroxy-omeprazole]/[omeprazole]. The morbidly obese model accounted for the down-regulation of CYP2C19 and CYP3A4 to recapitulate the observed data. Sensitivity analysis showed that intestinal CYP3A4, gastric pH, small intestine bypass, and the delay in bile release do not have a major influence on omeprazole exposure. Hepatic CYP3A4 had a significant impact on the AUC of (S)-omeprazole, while hepatic CYP2C19 affected both (R)- and (S)-omeprazole AUC. After gastric bypass surgery, the activity of CYP3A4 and CYP2C19 is restored. The PBPK model was linked to a mechanism-based PD model to assess the effect of omeprazole on intragastric pH. Following 40 mg omeprazole, the mean intragastric pH was 4.3, 4.6, and 6.6 in non-obese, obese, and post-gastric bypass populations, and the daily time with pH >4 was 14.7, 16.4, and 24 h. Our PBPK/PD approach provides a comprehensive understating of the impact of obesity and weight loss on CYP3A4 and CYP2C19 activity and omeprazole pharmacokinetics. Given that simulated intragastric pH is relatively high in post-RYGB patients, irrespective of the dose of omeprazole, additional clinical outcomes are imperative to assess the effect of proton pump inhibitor in preventing marginal ulcers in this population.
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Affiliation(s)
- Leandro F. Pippa
- Department of Pharmaceutics, Center for Pharmacometrics and Systems Pharmacology, College of PharmacyUniversity of FloridaOrlandoFloridaUSA
| | - Valvanera Vozmediano
- Department of Pharmaceutics, Center for Pharmacometrics and Systems Pharmacology, College of PharmacyUniversity of FloridaOrlandoFloridaUSA
| | | | - Daan Touw
- Department of Clinical Pharmacy and PharmacologyUniversity Medical Center GroningenGroningenThe Netherlands
- Department of Pharmaceutical Analysis, Groningen Research Institute of Pharmacy, Faculty of Science and EngineeringUniversity of GroningenGroningenThe Netherlands
| | - Amira Soliman
- Department of Pharmaceutics, Center for Pharmacometrics and Systems Pharmacology, College of PharmacyUniversity of FloridaOrlandoFloridaUSA
- Department of Pharmacy Practice, Faculty of PharmacyHelwan UniversityHelwanEgypt
| | - Rodrigo Cristofoletti
- Department of Pharmaceutics, Center for Pharmacometrics and Systems Pharmacology, College of PharmacyUniversity of FloridaOrlandoFloridaUSA
| | | | - Natalia Valadares de Moraes
- Department of Pharmaceutics, Center for Pharmacometrics and Systems Pharmacology, College of PharmacyUniversity of FloridaOrlandoFloridaUSA
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Li X, Hu Q, Xu T. Associated factors with voriconazole plasma concentration: a systematic review and meta-analysis. Front Pharmacol 2024; 15:1368274. [PMID: 39246651 PMCID: PMC11377273 DOI: 10.3389/fphar.2024.1368274] [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: 01/10/2024] [Accepted: 08/12/2024] [Indexed: 09/10/2024] Open
Abstract
Background: Voriconazole plasma concentration exhibits significant variability and maintaining it within the therapeutic range is the key to enhancing its efficacy. We conducted a systematic review and meta-analysis to estimate the prevalence of patients achieving the therapeutic range of plasma voriconazole concentration and identify associated factors. Methods: Eligible studies were identified through the PubMed, Embase, Cochrane Library, and Web of Science databases from their inception until 18 November 2023. We conducted a meta-analysis using a random-effects model to determine the prevalence of patients who reached the therapeutic plasma voriconazole concentration range. Factors associated with plasma voriconazole concentration were summarized from the included studies. Results: Of the 60 eligible studies, 52 reported the prevalence of patients reaching the therapeutic range, while 20 performed multiple linear regression analyses. The pooled prevalence who achieved the therapeutic range was 56% (95% CI: 50%-63%) in studies without dose adjustment patients. The pooled prevalence of adult patients was 61% (95% CI: 56%-65%), and the pooled prevalence of children patients was 55% (95% CI: 50%-60%) The study identified, in the children population, several factors associated with plasma voriconazole concentration, including age (coefficient 0.08, 95% CI: 0.01 to 0.14), albumin (-0.05 95% CI: -0.09 to -0.01), in the adult population, some factors related to voriconazole plasma concentration, including omeprazole (1.37, 95% CI 0.82 to 1.92), pantoprazole (1.11, 95% CI: 0.17-2.04), methylprednisolone (-1.75, 95% CI: -2.21 to -1.30), and dexamethasone (-1.45, 95% CI: -2.07 to -0.83). Conclusion: The analysis revealed that only approximately half of the patients reached the plasma voriconazole concentration therapeutic range without dose adjustments and the pooled prevalence of adult patients reaching the therapeutic range is higher than that of children. Therapeutic drug monitoring is crucial in the administration of voriconazole, especially in the children population. Particular attention may be paid to age, albumin levels in children, and the use of omeprazole, pantoprazole, dexamethasone and methylprednisolone in adults. Systematic Review Registration: https://www.crd.york.ac.uk/prospero/display_record.php?ID=CRD42023483728.
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Affiliation(s)
- Xiaoqi Li
- Department of Pharmacy, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Qiaozhi Hu
- Department of Pharmacy, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Ting Xu
- Department of Pharmacy, West China Hospital, Sichuan University, Chengdu, Sichuan, China
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Cloyd CP, Macedone D, Merandi J, Pierson S, Sellas Wcislo M, Lutmer J, MacDonald J, Ayad O, Kalata L, Thompson RZ. A Quality Initiative to Improve Appropriate Medication Dosing in Pediatric Patients with Obesity. Pediatr Qual Saf 2024; 9:e741. [PMID: 38868757 PMCID: PMC11167219 DOI: 10.1097/pq9.0000000000000741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Accepted: 05/17/2024] [Indexed: 06/14/2024] Open
Abstract
Introduction Emerging evidence supports the use of alternative dosing weights for medications in patients with obesity. Pediatric obesity presents a particular challenge because most medications are dosed based on patient weight. Additionally, building system-wide pediatric obesity safeguards is difficult due to pediatric obesity definitions of body mass index-percentile-for-age via the Center for Disease Control growth charts. We describe a quality initiative to increase appropriate medication dosing in inpatients with obesity. The specific aim was to increase appropriate dosing for 7 high-risk medications in inpatients with obesity ≥2 years old from 37% to >74% and to sustain for 1 year. Methods The Institute for Healthcare Improvement model for improvement was used to plan interventions and track outcomes progress. Interventions included a literature review to establish internal dosing guidance, electronic health record (EHR) functionality to identify pediatric patients with obesity, a default selection for medication weight with an opt-out, and obtaining patient heights in the emergency department. Results Appropriate dosing weight use in medication ordered for patients with obesity increased from 37% to 83.4% and was sustained above the goal of 74% for 12 months. Conclusions Implementation of EHR-based clinical decision support has increased appropriate evidence-based dosing of medications in pediatric and adult inpatients with obesity. Future studies should investigate the clinical and safety implications of using alternative dosing weights in pediatric patients.
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Affiliation(s)
- Colleen P. Cloyd
- From the Department of Pharmacy, Nationwide Children’s Hospital, Columbus Ohio
- Department of Critical Care Medicine, Nationwide Children’s Hospital, Columbus, Ohio
| | - Danielle Macedone
- From the Department of Pharmacy, Nationwide Children’s Hospital, Columbus Ohio
- Nationwide Children’s Hospital Center for Clinical Excellence, Columbus, Ohio
| | - Jenna Merandi
- From the Department of Pharmacy, Nationwide Children’s Hospital, Columbus Ohio
| | - Shawn Pierson
- From the Department of Pharmacy, Nationwide Children’s Hospital, Columbus Ohio
| | - Maria Sellas Wcislo
- From the Department of Pharmacy, Nationwide Children’s Hospital, Columbus Ohio
| | - Jeffrey Lutmer
- Department of Critical Care Medicine, Nationwide Children’s Hospital, Columbus, Ohio
- The Ohio State University College of Medicine, Columbus, Ohio
| | - Jennifer MacDonald
- Department of Critical Care Medicine, Nationwide Children’s Hospital, Columbus, Ohio
- The Ohio State University College of Medicine, Columbus, Ohio
| | - Onsy Ayad
- Department of Critical Care Medicine, Nationwide Children’s Hospital, Columbus, Ohio
- The Ohio State University College of Medicine, Columbus, Ohio
| | - Lindsay Kalata
- From the Department of Pharmacy, Nationwide Children’s Hospital, Columbus Ohio
| | - R. Zachary Thompson
- From the Department of Pharmacy, Nationwide Children’s Hospital, Columbus Ohio
- Department of Critical Care Medicine, Nationwide Children’s Hospital, Columbus, Ohio
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Takahashi T, Jaber MM, Smith AR, Jacobson PA, Fisher J, Kirstein MN. Predictive Value of C-Reactive Protein and Albumin for Temporal Within-Individual Pharmacokinetic Variability of Voriconazole in Pediatric Hematopoietic Cell Transplant Patients. J Clin Pharmacol 2021; 62:855-862. [PMID: 34970774 DOI: 10.1002/jcph.2024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Accepted: 12/28/2021] [Indexed: 11/10/2022]
Abstract
Voriconazole is a widely used antifungal agent in immunocompromised patients, but its utility is limited by its variable exposure and narrow therapeutic index. Population pharmacokinetic (PK) models have been used to characterize voriconazole PK and derive individualized dosing regimens. However, determinants of temporal within-patient variability of voriconazole PK were not well-established. We aimed to characterize temporal variability of voriconazole PK within individuals and identify predictive clinical factors. This study was conducted as a part of a single-institution, phase I study of intravenous voriconazole in children undergoing HCT (NCT02227797). We analyzed voriconazole PK study data collected at week 1 and again at week 2 after the start of voriconazole therapy in 59 pediatric HCT patients (age <21 years). Population PK analysis using nonlinear mixed effect modeling was performed to analyze temporal within-individual variability of voriconazole PK by incorporating a between-occasion variability term in the model. A two-compartment linear elimination model incorporating body weight and CYP2C19 phenotype described the data. Ratio of individual voriconazole clearance between weeks 1 to 2 ranged from 0.11 to 3.3 (-9.1 to +3.3-fold change). Incorporation of covariate effects by serum C-reactive protein (CRP) and albumin levels decreased between-occasion variability of clearance (coefficient of variation: from 59.5% to 41.2%) and improved the model fit (p<0.05). As significant covariates on voriconazole PK, CRP and albumin concentrations may potentially serve as useful biomarkers as part of therapeutic drug monitoring. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Takuto Takahashi
- Division of Hematology and Oncology, Department of Pediatrics, University of Minnesota, Minneapolis, MN, USA.,Division of Blood and Marrow Transplant, Department of Pediatrics, University of Minnesota, Minneapolis, MN, USA.,Department of Experimental and Clinical Pharmacology, University of Minnesota, Minneapolis, MN, USA
| | - Mutaz M Jaber
- Department of Experimental and Clinical Pharmacology, University of Minnesota, Minneapolis, MN, USA
| | - Angela R Smith
- Division of Blood and Marrow Transplant, Department of Pediatrics, University of Minnesota, Minneapolis, MN, USA.,Masonic Cancer Center, University of Minnesota, Minneapolis, MN, USA
| | - Pamala A Jacobson
- Department of Experimental and Clinical Pharmacology, University of Minnesota, Minneapolis, MN, USA
| | - James Fisher
- Department of Experimental and Clinical Pharmacology, University of Minnesota, Minneapolis, MN, USA
| | - Mark N Kirstein
- Department of Experimental and Clinical Pharmacology, University of Minnesota, Minneapolis, MN, USA.,Masonic Cancer Center, University of Minnesota, Minneapolis, MN, USA
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Factors Affecting Voriconazole Trough Concentration and Optimal Maintenance Voriconazole Dose in Chinese Children. Antibiotics (Basel) 2021; 10:antibiotics10121542. [PMID: 34943754 PMCID: PMC8698693 DOI: 10.3390/antibiotics10121542] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 12/07/2021] [Accepted: 12/08/2021] [Indexed: 12/19/2022] Open
Abstract
Voriconazole is a triazole antifungal agent commonly used for the treatment and prevention of invasive aspergillosis (IA). However, the study of voriconazole's use in children is limited. The present study was performed to explore maintenance dose to optimize voriconazole dosage in children and the factors affecting voriconazole trough concentration. This is a non-interventional retrospective clinical study conducted from 1 January 2016 to 31 December 2020. The study finally included 94 children with 145 voriconazole trough concentrations. The probability of achieving a targeted concentration of 1.0–5.5 µg/mL with empiric dosing increased from 43 (45.3%) to 78 (53.8%) after the TDM-guided adjustment. To achieve targeted concentration, the overall target maintenance dose for the age group of less than 2, 2 to 6, 6 to 12, and 12 to 18 years old was approximately 5.71, 6.67, 5.08 and 3.31 mg·kg−1/12 h, respectively (p < 0.001). Final multivariate analysis found that weight (p = 0.019), dose before sampling (p < 0.001), direct bilirubin (p < 0.001), urea nitrogen (p = 0.038) and phenotypes of CYP2C19 were influencing factors of voriconazole trough concentration. These factors can explain 36.2% of the variability in voriconazole trough concentration. Conclusion: In pediatric patients, voriconazole maintenance doses under the target concentration tend to be lower than the drug label recommended, but this still needs to be further studied. Age, body weight, dose, direct bilirubin, urea nitrogen and phenotypes of CYP2C19 were found to be influencing factors of voriconazole concentration in Chinese children. The influence of these factors should be taken into consideration during voriconazole use.
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Zhao Y, Xiao C, Hou J, Wu J, Xiao Y, Zhang B, Sandaradura I, Yan M. A Large Sample Retrospective Study on the Distinction of Voriconazole Concentration in Asian Patients from Different Clinical Departments. Pharmaceuticals (Basel) 2021; 14:ph14121239. [PMID: 34959640 PMCID: PMC8705093 DOI: 10.3390/ph14121239] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Revised: 11/15/2021] [Accepted: 11/23/2021] [Indexed: 01/04/2023] Open
Abstract
Voriconazole (VRZ) is widely used to prevent and treat invasive fungal infections; however, there are a few studies examining the variability and influencing the factors of VRZ plasma concentrations across different clinical departments. This study aimed to evaluate distinction of VRZ concentrations in different clinical departments and provide a reference for its reasonable use. From 1 May 2014 to 31 December 2020, VRZ standard rates and factors affecting the VRZ trough concentration were analyzed, and a multiple linear regression model was constructed. The standard rates of VRZ in most departments were above 60%. A total of 676 patients with 1212 VRZ trough concentrations using a dosing regimen of 200 mg q12h from seven departments were enrolled in the correlation analysis. The concentration distribution varied significantly among different departments (p < 0.001). Fifteen factors, including department, CYP2C19 phenotype, and gender, correlated with VRZ concentration. A multiple linear regression model was established as follows: VRZ trough concentration = 5.195 + 0.049 × age + 0.007 × alanine aminotransferase + 0.010 × total bilirubin − 0.100 × albumin − 0.004 × gamma-glutamyl transferase. According to these indexes, we can predict possible changes in VRZ trough concentration and adjust its dosage precisely and individually.
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Affiliation(s)
- Yichang Zhao
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha 410011, China; (Y.Z.); (C.X.); (J.H.); (J.W.); (Y.X.); (B.Z.)
| | - Chenlin Xiao
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha 410011, China; (Y.Z.); (C.X.); (J.H.); (J.W.); (Y.X.); (B.Z.)
| | - Jingjing Hou
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha 410011, China; (Y.Z.); (C.X.); (J.H.); (J.W.); (Y.X.); (B.Z.)
| | - Jiamin Wu
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha 410011, China; (Y.Z.); (C.X.); (J.H.); (J.W.); (Y.X.); (B.Z.)
| | - Yiwen Xiao
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha 410011, China; (Y.Z.); (C.X.); (J.H.); (J.W.); (Y.X.); (B.Z.)
| | - Bikui Zhang
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha 410011, China; (Y.Z.); (C.X.); (J.H.); (J.W.); (Y.X.); (B.Z.)
| | - Indy Sandaradura
- School of Medicine, University of New South Wales, Sydney, NSW 2052, Australia;
- Centre for Infectious Diseases and Microbiology, Westmead Hospital, Sydney, NSW 2145, Australia
| | - Miao Yan
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha 410011, China; (Y.Z.); (C.X.); (J.H.); (J.W.); (Y.X.); (B.Z.)
- Correspondence: ; Tel.: +86-0731-8529-2098; Fax: +86-0731-8443-6720
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Impact of CYP2C19 Phenotype and Drug-Drug Interactions on Voriconazole Concentration in Pediatric Patients. Antimicrob Agents Chemother 2021; 65:e0020721. [PMID: 34152823 DOI: 10.1128/aac.00207-21] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Voriconazole (VRC), a first-line agent for the treatment of invasive fungal infections, is mainly metabolized by human cytochrome P450 (CYP) 2C19. In this study, a retrospective analysis was performed to investigate the key factors that influence the plasma trough concentration (Cmin) of VRC, and an appropriate dosing regimen for pediatric patients was drafted subsequently. Overall, factors such as age, CYP2C19 phenotype, and combination medication with proton pump inhibitors accounted for 23.4% of variability in dose-normalized Cmin values of VRC by a multiple linear regression analysis. Dose-normalized Cmin values in the poor metabolizers (PMs) and intermediate metabolizers (IMs) were significantly higher than those in extensive metabolizers (EMs) (P < 0.001). To achieve therapeutic Cmin for CYP2C19 ultrarapid metabolizers (UMs) or EMs, patients aged no more than 12 and more than 12 years required doses of 6.53 ± 2.08 and 3.95 ± 0.85 mg/kg of body weight twice daily (P = 0.007). For CYP2C19 PMs or IMs, patients aged under 12 and over 12 years required doses of 5.75 ± 1.73 and 4.23 ± 0.76 mg/kg twice daily, respectively (P = 0.019). Furthermore, coadministration of rifamycin sodium or omeprazole exhibited significant effects on VRC Cmin. Taken together, it is necessary to pay attention to the impact of CYP2C19 phenotype and drug-drug interactions to achieve optimal therapy.
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