journal
MENU ▼
Read by QxMD icon Read
search

Therapeutic Drug Monitoring

journal
https://www.readbyqxmd.com/read/28834922/relationship-between-the-cyp2c19-phenotype-using-the-voriconazole-to-voriconazole-n-oxide-plasma-concentration-ratio-and-demographic-and-clinical-characteristics-of-japanese-patients-with-different-cyp2c19-genotypes
#1
Takenori Niioka, Naohito Fujishima, Maiko Abumiya, Takaya Yamashita, Kumi Ubukawa, Miho Nara, Masumi Fujishima, Naoto Takahashi, Masatomo Miura
BACKGROUND: Although voriconazole (VRCZ) is metabolized to VRCZ N-oxide principally by CYP2C19, VRCZ clearance is affected by multiple factors. In this study, we investigated the relationship between the CYP2C19 phenotype using the VRCZ-to-VRCZ N-oxide plasma concentration ratio (VRCZ/N-oxide) and demographic and clinical characteristics of Japanese patients taking VRCZ. METHODS: A total of 65 Japanese patients taking VRCZ for prophylaxis or treatment of fungal infection were enrolled in this study...
October 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28767619/women-administered-standard-dose-imatinib-for-chronic-myeloid-leukemia-have-higher-dose-adjusted-plasma-imatinib-and-norimatinib-concentrations-than-men
#2
Sarah L Belsey, Robin Ireland, Kathryn Lang, Aytug Kizilors, Aloysius Ho, Ghulam J Mufti, Alessandra Bisquera, Hugues De Lavallade, Robert J Flanagan
BACKGROUND: The standard dose of imatinib for the treatment of chronic-phase chronic myeloid leukemia (CML) is 400 mg·d. A predose plasma imatinib concentration of >1 mg·L is associated with improved clinical response. This study aimed to assess the plasma imatinib and norimatinib concentrations attained in patients with chronic myeloid leukemia administered standard doses of imatinib adjusted for dose, age, sex, body weight, and response. METHODS: We evaluated data from a cohort of patients treated between 2008 and 2014 with respect to dose, age, sex, body weight, and response...
October 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28749817/prednisolone-and-prednisone-pharmacokinetics-in-pediatric-renal-transplant-recipients-a-prospective-study
#3
Ragnhild Heier Skauby, Anna Bjerre, Ingjerd Sæves, Nils Tore Vethe, Sara Bremer, Anja Svarstad, Stein Bergan
BACKGROUND: Prednisolone is a standard component of immunosuppressive protocols in renal transplantation (Tx) and despite standardized treatment regimens, adverse side effects are still frequent. The aim of this study was to characterize the pharmacokinetics of prednisolone and prednisone in pediatric renal transplant recipients in the first 52 weeks post Tx, to describe the relationship between prednisolone and prednisone, and to investigate a possible relationship between the development of new-onset diabetes after Tx (NODAT) and glucocorticoid exposure...
October 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28742650/reliable-and-easy-to-use-liquid-chromatography-tandem-mass-spectrometry-method-for-simultaneous-analysis-of-fluconazole-isavuconazole-itraconazole-hydroxy-itraconazole-posaconazole-and-voriconazole-in-human-plasma-and-serum
#4
Carsten Müller, David Gehlen, Cornelia Blaich, Domenik Prozeller, Blasius Liss, Thomas Streichert, Martin H J Wiesen
BACKGROUND: A fast and easy-to-use liquid chromatography-tandem mass spectrometry method for the determination and quantification of 6 triazoles [fluconazole (FLZ), isavuconazole (ISZ), itraconazole (ITZ), hydroxy-itraconazole (OH-ITZ), posaconazole (PSZ), and voriconazole (VRZ)] in human plasma and serum was developed and validated for therapeutic drug monitoring. METHODS: Sample preparation was based on protein precipitation with acetonitrile and subsequent centrifugation...
October 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28723731/combined-effect-of-cyp2b6-genotype-and-other-candidate-genes-on-a-steady-state-serum-concentration-of-methadone-in-opioid-maintenance-treatment
#5
Marianne K Kringen, Fatemeh Chalabianloo, Jean-Paul Bernard, Jørgen G Bramness, Espen Molden, Gudrun Høiseth
BACKGROUND: A considerable interindividual variability in methadone pharmacokinetics is seen in patients on methadone maintenance treatment. The aim of this study was to clarify the impact of the reduced function CYP2B6*6 variant allele together with variants in other candidate genes on a steady-state methadone concentration in a naturalistic setting. METHODS: Information of methadone serum concentration, dose, age, sex, and CYP2C9, CYP2C19, and CYP2D6 genotypes were collected from a routine therapeutic drug monitoring database, whereas variant alleles in CYP2B6 and CYP3A5 were retrospectively genotyped...
October 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28700449/development-of-a-simple-and-rapid-method-to-measure-free-fraction-of-valproic-acid-in-plasma-using-ultrafiltration-and-ultra-high-performance-liquid-chromatography-mass-spectroscopy-application-to-therapeutic-drug-monitoring
#6
Shansen Xu, Yanan Chen, Mingming Zhao, Limei Zhao
BACKGROUND: Valproic acid (VPA) is widely used as an antiepileptic drug in children, and it is usually coadministered with other antiepileptic drugs. Because of its narrow therapeutic range and large variations in pharmacokinetic/pharmacodynamic behavior in different individuals, therapeutic drug monitoring of the trough total VPA concentration is commonly used to guide dosing. However, as only the free fraction of VPA that exerts pharmacological and toxic effects, it may be more meaningful to determine the unbound VPA concentration in plasma...
October 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28682926/evaluation-of-the-novel-methotrexate-architect-chemiluminescent-immunoassay-clinical-impact-on-pharmacokinetic-monitoring
#7
Maria D Aumente, Julia López-Santamaría, María Concepción Donoso-Rengifo, Inmaculada Reyes-Torres, Pablo Montejano Hervás
BACKGROUND: Fluorescence polarization immunoassay (FPIA) has probably been the most widely used technique for the determination of methotrexate (MTX) concentrations in clinical laboratories. After its replacement by a novel architect chemiluminescent microparticle immunoassay (CMIA), it is essential to verify that there are no differences between the methods that can induce an error in leucovorin rescue with dire consequences for the patient. The objective of our study was to compare plasma/serum MTX measurements between CMIA and FPIA (reference method in this study) in the work conditions of a clinical pharmacokinetics unit to determine whether any difference would affect clinical decisions on the management of this drug...
October 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28682925/therapeutic-drug-monitoring-of-gentamicin-peak-concentrations-in-critically-ill-patients
#8
Caspar J Hodiamont, Julie M Janssen, Menno D de Jong, Ron A Mathôt, Nicole P Juffermans, Reinier M van Hest
BACKGROUND: Adequate gentamicin peak concentrations (Cmax) are important for optimal clinical efficacy. Within a critically ill patient, substantial variability in Cmax can occur over time, hampering the usefulness of therapeutic drug monitoring (TDM). The aim of this study was to evaluate the effect of gentamicin dosing based on Cmax after the first dose on gentamicin target attainment in critically ill patients. METHODS: From gentamicin-treated critically ill patients, dosing information, clinical parameters, and serum concentrations were collected prospectively...
October 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28682924/lamotrigine-drug-interactions-in-combination-therapy-and-the-influence-of-therapeutic-drug-monitoring-on-clinical-outcomes-of-adult-patients
#9
Milan Grundmann, Blanka Koristkova, Hana Brozmanova, Ivana Kacirova
BACKGROUND: The aim was to study the impact of therapeutic drug monitoring (TDM) on patients on lamotrigine (LTG) therapy and the evaluation of possible drug interactions, especially in triple antiepileptic drug combinations. METHODS: During the period of 2001-2014, 3118 predose samples were taken from 1137 patients >15 years of age as part of their routine TDM. Drug interactions were evaluated using calculation of LTG clearance (CL). RESULTS: Valproic acid (VPA) decreased LTG CL by 66% in bitherapy, and by 35% and 31% in triple therapy with carbamazepine (CBZ) and phenytoin (PHT), respectively...
October 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28650902/itpa-activity-in-adults-and-children-treated-with-or-without-azathioprine-relationship-between-tpmt-activity-thiopurine-metabolites-and-co-medications
#10
Antony Citterio-Quentin, Mustapha Moulsma, Marie-Paule Gustin, Roselyne Boulieu
BACKGROUND: The implication of inosine triphosphate pyrophosphatase (ITPA) on thiopurine drug response variability has been investigated but little data are available on its role on thiopurine metabolites. The ability of ITPA to modify the thiopurine metabolite levels is currently used to optimize azathioprine (AZA) therapy in relation to thiopurine S-methyltransferase (TPMT) activity, the aim of this study is to investigate ITPA phenotype in a large population and to evaluate the relation between ITPA and TPMT activities and thiopurine metabolites...
October 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28650901/application-of-quality-by-design-approach-to-bioanalysis-development-of-a-method-for-elvitegravir-quantification-in-human-plasma
#11
Sara Baldelli, Giorgio Marrubini, Dario Cattaneo, Emilio Clementi, Matteo Cerea
BACKGROUND: The application of Quality by Design (QbD) principles in clinical laboratories can help to develop an analytical method through a systematic approach, providing a significant advance over the traditional heuristic and empirical methodology. In this work, we applied for the first time the QbD concept in the development of a method for drug quantification in human plasma using elvitegravir as the test molecule. METHODS: The goal of the study was to develop a fast and inexpensive quantification method, with precision and accuracy as requested by the European Medicines Agency guidelines on bioanalytical method validation...
October 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28650900/a-high-throughput-hplc-ms-ms-assay-for-the-detection-quantification-and-simultaneous-structural-confirmation-of-136-drugs-and-metabolites-in-human-urine
#12
Jacek Klepacki, Baharak Davari, Marion Boulet, Ryan Lizarraga, Uwe Christians
BACKGROUND: Because of its superior sensitivity and specificity, multianalyte high-performance liquid chromatography coupled with tandem mass spectrometry has become the gold standard in clinical toxicology. Although several qualitative and quantitative liquid chromatography coupled with tandem mass spectrometry assays on various mass spectrometry platforms have been described in the literature, most methods either analyze only a limited number of compounds and/or require tedious and time-consuming sample preparation...
October 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28640063/pharmacodynamic-monitoring-of-tacrolimus-based-immunosuppression-in-cd14-monocytes-after-kidney-transplantation
#13
Nynke M Kannegieter, Dennis A Hesselink, Marjolein Dieterich, Gretchen N de Graav, Rens Kraaijeveld, Ajda T Rowshani, Pieter J M Leenen, Carla C Baan
BACKGROUND: Monocytes significantly contribute to ischemia-reperfusion injury and allograft rejection after kidney transplantation. However, the knowledge about the effects of immunosuppressive drugs on monocyte activation is limited. Conventional pharmacokinetic methods for immunosuppressive drug monitoring are not cell type-specific. In this study, phosphorylation of 3 signaling proteins was measured to determine the pharmacodynamic effects of immunosuppression on monocyte activation in kidney transplant patients...
October 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28640062/an-atmospheric-pressure-chemical-ionization-ms-ms-assay-using-online-extraction-for-the-analysis-of-11-cannabinoids-and-metabolites-in-human-plasma-and-urine
#14
Jelena Klawitter, Cristina Sempio, Sophie Mörlein, Erik De Bloois, Jacek Klepacki, Thomas Henthorn, Maureen A Leehey, Edward J Hoffenberg, Kelly Knupp, George S Wang, Christian Hopfer, Greg Kinney, Russell Bowler, Nicholas Foreman, Jeffrey Galinkin, Uwe Christians, Jost Klawitter
BACKGROUND: Although, especially in the United States, there has been a recent surge of legalized cannabis for either recreational or medicinal purposes, surprisingly little is known about clinical dose-response relationships, pharmacodynamic and toxicodynamic effects of cannabinoids such as Δ9-tetrahydrocannabinol (THC). Even less is known about other active cannabinoids. METHODS: To address this knowledge gap, an online extraction, high-performance liquid chromatography coupled with tandem mass spectrometry method for simultaneous quantification of 11 cannabinoids and metabolites including THC, 11-hydroxy-Δ9-tetrahydrocannabinol, 11-nor-Δ9-tetrahydrocannabinol-9-carboxylic acid, 11-nor-Δ9-tetrahydrocannabinol-9-carboxylic acid glucuronide (THC-C-gluc), cannabinol, cannabidiol, cannabigerol, cannabidivarin, Δ9-tetrahydrocannabivarin (THCV), and 11-nor-9-carboxy-Δ9-tetrahydrocannabivarin (THCV-COOH) was developed and validated in human urine and plasma...
October 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28700524/challenges-for-detecting-valproic-acid-in-a-nontargeted-urine-drug-screening-method
#15
Jeffrey D Pope, Marion J Black, Olaf H Drummer, Hans G Schneider
BACKGROUND: Valproic acid (VPA) is a widely prescribed medicine, and acute toxicity is possible. As such, it should be included in any nontargeted urine drug screening method. In many published liquid chromatography-electrospray ionization-mass spectrometry (LC-ESI-MS/MS) methods, VPA is usually measured using a pseudo-multiple reaction monitoring (MRM) transition. We investigate a simple ultra-high-performance liquid chromatography-quadrupole time-of-flight (QTof) approach to detect the presence of VPA with more confidence...
August 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28700523/dried-blood-spots-combined-with-ultra-high-performance-liquid-chromatography-mass-spectrometry-for-the-quantification-of-the-antipsychotics-risperidone-aripiprazole-pipamperone-and-their-major-metabolites
#16
Camille Tron, Sanne M Kloosterboer, Bart C H van der Nagel, Rixt A Wijma, Bram Dierckx, Gwen C Dieleman, Teun van Gelder, Birgit C P Koch
BACKGROUND: Risperidone, aripiprazole, and pipamperone are antipsychotic drugs frequently prescribed for the treatment of comorbid behavioral problems in children with autism spectrum disorders. Therapeutic drug monitoring (TDM) could be useful to decrease side effects and to improve patient outcome. Dried blood spot (DBS) sample collection seems to be an attractive technique to develop TDM of these drugs in a pediatric population. The aim of this work was to develop and validate a DBS assay suitable for TDM and home sampling...
August 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28700522/dried-blood-spot-sampling-for-tacrolimus-and-mycophenolic-acid-in-children-analytical-and-clinical-validation
#17
Lisa C Martial, Karin E J Hoogtanders, Michiel F Schreuder, Elisabeth A Cornelissen, Jac van der Heijden, Manuela A Joore, Erik M Van Maarseveen, David M Burger, Sander Croes, Roger J M Brüggemann, Rob E Aarnoutse
BACKGROUND: Tacrolimus and mycophenolic acid (MPA) are the backbone of immunosuppressive therapy after pediatric kidney transplantation. Dosing of these drugs is individualized by therapeutic drug monitoring. Dried blood spot (DBS) sampling may prove beneficial over conventional venous sampling. We aimed to develop and clinically validate a DBS method for tacrolimus and MPA in children. METHODS: A joint DBS liquid chromatography-mass spectrometry assay for tacrolimus and MPA was developed...
August 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28700521/effect-of-cyp3a4-and-cyp3a5-genetic-polymorphisms-on-the-pharmacokinetics-of-sirolimus-in-healthy-chinese-volunteers
#18
Jing Zhang, Ying Dai, Zhihong Liu, Minxin Zhang, Chen Li, Dingxiong Chen, Hongtao Song
BACKGROUND: Sirolimus is a promising immunosuppressive drug for preventing the rejection of organ transplants. However, inter-individual variability in sirolimus pharmacokinetics causes adverse drug reactions, compromising therapeutic efficacy. Sirolimus is primarily metabolized by cytochrome CYP3A4 and CYP3A5. This study aimed to clarify the effect of CYP3A genetic polymorphisms, including the CYP3A4*1G and CYP3A5*3 polymorphisms, on the pharmacokinetics of sirolimus. METHODS: Thirty-one healthy Chinese volunteers were included in this study...
August 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28700520/current-practice-for-therapeutic-drug-monitoring-of-biopharmaceuticals-in-rheumatoid-arthritis
#19
Frédéric Medina, Chamaida Plasencia, Philippe Goupille, David Ternant, Alejandro Balsa, Denis Mulleman
The treatment of rheumatoid arthritis (RA) has largely improved in the biopharmaceutical era. These compounds, primarily tumor necrosis factor (TNF) inhibitors, are effective, but some patients may show poor response, sometimes because of the presence of antidrug antibodies (ADAs). In some instances, clinicians may increase or taper the dose depending on the clinical response. Besides the current clinical-based practice, a tailored strategy based on drug monitoring has emerged as a way to improve the use of these drugs...
August 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28700519/managing-drug-drug-interaction-between-ombitasvir-paritaprevir-ritonavir-dasabuvir-and-mycophenolate-mofetil
#20
Florian Lemaitre, Zeineb Ben Ali, Camille Tron, Caroline Jezequel, Christelle Boglione-Kerrien, Marie-Clémence Verdier, Dominique Guyader, Eric Bellissant
No drug-drug interaction study has been conducted to date for the combination of ombitasvir, paritaprevir/ritonavir, dasabuvir (3D), and mycophenolic acid (MPA). We here report the case of a hepatitis C virus-infected patient treated with 3D and MPA for vasculitis. In light of the threat of drug-drug interaction, the concentration of MPA was measured before, during, and 15 days after the end of the 3D treatment. Similar values were found at all 3 time points, thus indicating that there is probably no need to adapt MPA dosage to 3D...
August 2017: Therapeutic Drug Monitoring
journal
journal
27774
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"