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Therapeutic Drug Monitoring

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https://www.readbyqxmd.com/read/29140892/proficiency-testing-for-meropenem-and-piperacillin-therapeutic-drug-monitoring-preliminary-results-from-the-belgian-society-on-infectiology-and-clinical-microbiology-pk-pd-working-group
#1
Mieke Carlier, Alexandre Athanasopoulos, Daniëlle Borrey, Pieter Colin, Frédéric Cotton, Raphael Denooz, Hugo Neels, Isabel Spriet, Timothy Ghys, Alain G Verstraete, Veronique Stove
No abstract text is available yet for this article.
November 14, 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/29120974/plasma-7-hydroxymethotrexate-levels-versus-methotrexate-to-predict-delayed-elimination-in-children-receiving-high-dose-methotrexate
#2
Nicolas Fabresse, Bénédicte Devictor, Christel Pissier, Hervé Chambost, Bruno Lacarelle, Gérard Michel, Caroline Solas
BACKGROUND: The aim of this study was to investigate the correlation between 7-hydroxymethotrexate (7-OHMTX) and creatinine and to evaluate the predictive value of 7-OHMTX levels on delayed elimination at 24 and 48 hours. In addition, differences in methotrexate (MTX), 7-OHMTX levels, and MTX metabolism using the ratio MTX/7-OHMTX were determined according to age. METHODS: The authors included a total of 106 cycles, corresponding to 33 patients (mean age: 9.8 years, range: 2-18 years) suffering from acute lymphoblastic leukemia, non-Hodgkin lymphoma and osteosarcoma and receiving high-dose MTX (HD-MTX)...
November 8, 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/29120973/acute-intoxications-and-fatalities-from-illicit-fentanyl-and-analogues-an-update
#3
Simona Pichini, Renata Solimini, Paolo Berretta, Roberta Pacifici, Francesco Paolo Busardò
Illicit fentanyl and its analogues are very dangerous synthetic opioids, with high abuse potential and severe adverse effects including coma and death. They are used as adulterants in street heroin, cocaine, and methamphetamine, or as heroin substitutes sold to unaware users with a high risk of overdoses. Fentanyl and its analogues have also been identified in counterfeit medicinal products, such as oxycodone, hydrocodone, and alprazolam tablets, or as components of speedball mixtures together with cocaine or other stimulants...
November 8, 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/29120972/comparison-of-anti-xa-and-activated-partial-thromboplastin-time-monitoring-for-heparin-dosing-in-vascular-surgery-patients-a-single-center-retrospective-study
#4
Elsie Rizk, Allison D Wilson, Michelle U Murillo, David R Putney, Bcps-Aq Cardiology
BACKGROUND: Vascular surgery patients often require anticoagulation with intravenous unfractionated heparin monitored via anti-Xa levels or the activated partial thromboplastin time (aPTT). This study compares the two monitoring strategies in terms of major bleeding events in the vascular surgery population. METHODS: This was a single center, retrospective study that included patients treated with a pharmacy-managed heparin protocol monitored by either anti-Xa or aPTT after vascular surgery...
November 8, 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/29120971/a-systematic-review-of-salivary-versus-blood-concentrations-of-anti-tuberculosis-drugs-and-their-potential-for-salivary-therapeutic-drug-monitoring
#5
Simone H J van den Elsen, Lisette M Oostenbrink, Scott K Heysell, Daiki Hira, Daan J Touw, Onno W Akkerman, Mathieu S Bolhuis, Jan-Willem C Alffenaar
BACKGROUND: Therapeutic drug monitoring is useful in the treatment of tuberculosis to assure adequate exposure, minimize antibiotic resistance, and reduce toxicity. Salivary therapeutic drug monitoring could reduce the risks, burden, and costs of blood-based therapeutic drug monitoring. This systematic review compared human pharmacokinetics of anti-tuberculosis drugs in saliva and blood to determine if salivary therapeutic drug monitoring could be a promising alternative. METHODS: On December 2, 2016, PubMed and the Institute for Scientific Information Web of Knowledge were searched for pharmacokinetic studies reporting human salivary and blood concentrations of anti-tuberculosis drugs...
November 8, 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/29095798/relationship-between-initial-vancomycin-trough-levels-and-early-onset-vancomycin-associated-nephrotoxicity-in-critically-ill-patients
#6
Masayuki Chuma, Makoto Makishima, Toru Imai, Naohiro Tochikura, Shinichiro Suzuki, Tsukasa Kuwana, Nami Sawada, Tomohide Komatsu, Takako Sakaue, Norikazu Kikuchi, Yoshikazu Yoshida, Kosaku Kinoshita
BACKGROUND: Appropriate initial dosing of vancomycin (VCM) is important in improving survival and in preventing nephrotoxicity in critically ill patients, but the potential relationship between initial VCM trough levels and early-onset nephrotoxicity remains unclear. We examined the relationship between initial VCM trough levels and early-onset VCM-associated nephrotoxicity. METHODS: We performed a retrospective study of patients who had therapeutic drug monitoring of VCM with initial trough levels within 4 days after the beginning of VCM administration...
October 31, 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/29095797/influence-of-renal-function-on-pharmacokinetics-of-antiepileptic-drugs-metabolized-by-cyp3a4-in-a-patient-with-renal-impairment
#7
Yoshiaki Yamamoto, Naotaka Usui, Takuji Nishida, Miho Mori, Yukitoshi Takahashi, Katsumi Imai, Yoshiyuki Kagawa, Yushi Inoue
BACKGROUND: Several studies have demonstrated that renal impairment not only decreases renal clearance, but also hepatic clearance of medications that are CYP3A4 substrates. We evaluated the influence of renal function on the pharmacokinetics of antiepileptic drugs (AEDs) metabolized by CYP3A4. METHODS: We retrospectively calculated the concentration/dose ratio (CD ratio) for topiramate and clobazam in an epilepsy patient with renal impairment. In addition, we determined the CD ratio of perampanel in 17 patients with normal renal function and compared it with that in the patient with renal impairment...
October 31, 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/29084031/companion-and-complementary-diagnostics-focus-on-pd-l1-expression-assays-for-pd-1-pd-l1-checkpoint-inhibitors-in-nsclc
#8
Maria Hersom, Jan Trøst Jørgensen
Over the last couple of decades, molecular diagnostics have played an increasing role in drug development. Especially within oncology, more and more drugs are being developed together with a predictive biomarker assay using the drug-diagnostic co-development model. Not only do these assays support the development process but also the use of the drugs after regulatory approval as an important treatment decision tool. When these predictive biomarker assays are linked to a specific drug, they are called companion diagnostics...
October 27, 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/29140893/effect-of-n-desalkylquetiapine-quetiapine-plasma-level-ratio-on-anxiety-and-depression-in-bipolar-disoder-a-prospective-observational-study-erratum
#9
(no author information available yet)
No abstract text is available yet for this article.
December 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/29135908/evaluation-of-a-novel-immunoassay-for-lacosamide-therapeutic-drug-monitoring-comparison-with-a-liquid-chromatography-mass-spectrometry-assay
#10
Annachiara DʼUrso, Tiziano Ricotta, Ugo de Grazia
BACKGROUND: Monitoring serum levels of lacosamide, other than to establish individualized reference ranges may be helpful in several settings, including patients with liver and/or kidney failure or settings that may result in altered pharmacokinetic characteristics and to assess patients' compliance with therapy. In this study, the EurekaOne liquid chromatography-mass spectrometry (LC-MS/MS) method (in use method) and the ARK immunoassay method (new method) for lacosamide monitoring were compared...
December 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/29135907/efavirenz-therapeutic-range-in-hiv-1-treatment-naive-participants
#11
Cindy J Bednasz, Charles S Venuto, Qing Ma, Eric S Daar, Paul E Sax, Margaret A Fischl, Ann C Collier, Kimberly Y Smith, Camlin Tierney, Yang Yang, Gregory E Wilding, Gene D Morse
BACKGROUND: Efavirenz is currently suggested as an alternative to recommended antiretroviral (ARV) regimens by the Department of Health and Human Services for the treatment of HIV-1 in ARV-naive patients. A mid-dosing interval therapeutic range between 1000 and 4000 ng/mL for efavirenz has been proposed in the literature, with patients more likely to experience virologic failure below this range and adverse effects above. The current study reports an analysis of virologic outcome between those above, below, or within the reported efavirenz therapeutic range (1000-4000 ng/mL) and within subgroups...
December 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/29135906/effect-of-age-and-allele-variants-of-cyp3a5-cyp3a4-and-por-genes-on-the-pharmacokinetics-of-cyclosporin-a-in-pediatric-renal-transplant-recipients-from-serbia
#12
Mirjana Cvetković, Maja Zivković, Maja Bundalo, Ivana Gojković, Brankica Spasojević-Dimitrijeva, Aleksandra Stanković, Mirjana Kostić
BACKGROUND: The interindividual variability of cyclosporin A (CsA) pharmacokinetics might be explained by heterogeneity in the cytochrome P450 3A (CYP3A) subfamily. Altered CYP3A enzyme activity was associated with variant allele of P450 oxidoreductase gene (POR*28). The aim of this study was to assess the impact of age, CYP3A5*3, CYP3A4*22, and POR*28 alleles on CsA pharmacokinetics in pediatric renal transplant recipients. METHODS: Renal transplant patients receiving CsA (n = 47) were genotyped for CYP3A5*3, CYP3A4*22, and POR*28...
December 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/29135905/unsuccessful-suicide-attempt-with-tiapride
#13
Sylvain Couderc, Hervé Mourou, Caroline Monchaud, Franck Saint-Marcoux
To the best of our knowledge, no case has been published in the literature that reports an overdose of tiapride, either alone or in combination with other drugs. We report a self-poisoning case in an 18-year-old girl, with approximately 10 times the usual daily dose (ie, 2.5 g). Although the blood concentration was 20/30-fold higher than usually observed after therapeutic drug intakes (17,300 mcg/L), the patient remained almost asymptomatic.
December 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/29084032/dosopt-a-tool-for-personalized-bayesian-dose-adjustment-of-vancomycin-in-neonates
#14
Tõnis Tasa, Tuuli Metsvaht, Riste Kalamees, Jaak Vilo, Irja Lutsar
BACKGROUND: Our main aim has been to design a framework to improve vancomycin dosing in neonates. This required the development and verification of a computerized dose adjustment application, DosOpt, to guide the selection. METHODS: Model fitting in DosOpt uses Bayesian methods for deriving individual pharmacokinetic (PK) estimates from population priors and patient therapeutic drug monitoring measurements. These are used to simulate concentration-time curves and target-constrained dose optimization...
December 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/29040230/serum-concentrations-of-paliperidone-after-administration-of-the-long-acting-injectable-formulation
#15
Arne Helland, Olav Spigset
BACKGROUND: The pharmacokinetics of long-acting intramuscular paliperidone in a naturalistic setting is not well documented. The objective of this study was to investigate the relationship between dose and serum concentrations of paliperidone using data from a routine therapeutic drug monitoring service. METHODS: Serum concentration measurements in 310 samples from 110 male and 75 female patients receiving depot injections of paliperidone were retrospectively retrieved from the therapeutic drug monitoring database...
December 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/29040229/development-of-a-liquid-chromatography-tandem-mass-spectrometric-method-for-quantification-of-mycophenolic-acid-and-its-glucuronides-in-dried-blood-spot-samples
#16
Hiromasa Iboshi, Hiroaki Yamaguchi, Hiroyuki Suzuki, Masafumi Kikuchi, Masaki Tanaka, Shinya Takasaki, Akiko Takahashi, Masamitsu Maekawa, Miki Shimada, Yasushi Matsuda, Yoshinori Okada, Nariyasu Mano
BACKGROUND: Personalized immunosuppressive therapy, including accurate drug dosing based on the drug blood level, leads to better clinical outcomes, specifically regarding avoidance of drug-induced adverse effects and maintenance of efficacy. Mycophenolic acid (MPA) is used as an immunosuppressant in transplantation of various solid organs. The aim of this study was to develop a method for quantification of MPA and its metabolites, mycophenolic acid 7-O-glucuronide (MPAG) and mycophenolic acid acyl glucuronide, in dried blood spot (DBS) samples, using liquid chromatography/electrospray ionization/tandem mass spectrometry...
December 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/29040228/analytical-pitfalls-of-therapeutic-drug-monitoring-of-thiopurines-in-patients-with-inflammatory-bowel-disease
#17
Melek Simsek, Berrie Meijer, Chris J J Mulder, Adriaan A van Bodegraven, Nanne K H de Boer
The use of thiopurines in the treatment of inflammatory bowel disease (IBD) can be optimized by the application of therapeutic drug monitoring. In this procedure, 6-thioguanine nucleotides (6-TGN) and 6-methylmercaptopurine (6-MMP) metabolites are monitored and related to therapeutic response and adverse events, respectively. Therapeutic drug monitoring of thiopurines, however, is hampered by several analytical limitations resulting in an impaired translation of metabolite levels to clinical outcome in IBD...
December 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28976420/validated-lc-ms-ms-method-for-the-simultaneous-determination-of-amlodipine-and-its-major-metabolites-in-human-plasma-of-hypertensive-patients
#18
Reina Taguchi, Takafumi Naito, Hikaru Sato, Junichi Kawakami
BACKGROUND: No information on the pharmacokinetic characteristics of amlodipine (AML) metabolites is available. This study aimed to develop a method based on isocratic liquid chromatography coupled to tandem mass spectrometry for the simultaneous determination of AML and its 2 major metabolites, dehydroamlodipine (DH-AML) and O-des[2-aminoethyl]-O-carboxymethyl DH-AML (CM-DH-AML), and to use it for monitoring this drug in hypertensive patients. METHODS: Acetonitrile-deproteinized plasma specimens were separated using an octadecyl-silica column (3-μm particle size) with a mobile phase consisting of 50% methanol containing 0...
December 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28976419/predictive-performance-of-vancomycin-trough-concentrations-in-patients-with-diabetes-with-microalbuminuria
#19
Hiroshi Kimura, Marie Shigematsu, Akihiro Tanaka, Shinichi Watanabe, Shingo Takatori, Mamoru Tanaka, Takashi Mizuma, Hiroaki Araki
BACKGROUND: The performance of a population pharmacokinetic model in predicting trough concentrations after the initial vancomycin dose was evaluated in patients with albuminuria compared with patients who did not have albuminuria. METHODS: Data were collected from 52 patients infected with methicillin-resistant Staphylococcus aureus (excluding patients undergoing dialysis and acute kidney injury) and treated with vancomycin. The data included urinary albumin concentration...
December 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28953037/comparison-of-dried-blood-spots-versus-conventional-plasma-collection-for-the-characterization-of-efavirenz-pharmacokinetics-in-a-large-scale-global-clinical-trial-the-encore1-study
#20
Alieu B Amara, Laura J Else, Dianne Carey, Saye Khoo, David J Back, Janaki Amin, Sean Emery, Rebekah L Puls
BACKGROUND: The aim of this study was to determine the utility of dried blood spots (DBS) compared with conventional plasma collection methods for characterization of efavirenz pharmacokinetics, in the setting of a large-scale, global clinical trial (ENCORE1). METHODS: Six hundred thirty patients were recruited from 38 sites and had single matched whole blood DBS and plasma samples (mid-dose interval) taken at weeks 4 and 12 of treatment. In addition, a subgroup of patients underwent intensive DBS and plasma sampling (0-24 hours) to provide full-profile data for pharmacokinetic parameters...
December 2017: Therapeutic Drug Monitoring
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