Abstract:
:A stabilized therapeutic drug monitoring procedure incorporating the novel Empore solid-phase extraction membrane (SPEM) for isolation of the antiarrhythmic drugs mexiletine (MEX) and flecainide (FLEC) from serum is described. Routinely, serum (0.5 ml), adjusted to pH 4.5, is passed through an octyl (C8) SPEM to extract the drugs. A methanol:water wash follows to remove proteins and interferences. MEX and FLEC are eluted from the membrane with mobile phase and an aliquot is injected directly onto a Zorbax cyanopropyl (CN) high-performance liquid chromatographic column with detection at 214 nm. Evaporating/concentrating techniques that can adversely influence the stability of the volatile MEX are unnecessary. Recovery for both drugs exceeds 90% and the assay is linear from 0.05 mg/L up to at least 6.0 mg/L for MEX and from 0.05 mg/L up to at least 3.0 mg/L for FLEC. Precision (between-run) coefficients of variation range from 2.3 to 3.0% (0.49-1.97 mg/L) for MEX and 3.7 to 5.9% (0.240-0.992 mg/L) for FLEC. Interferences are minimal. When we compared performance of the Empore SPEM and large-particle solid-phase sorbents packed in cartridges, we observed greater capacity per gram of sorbent and smaller elution volume with the membrane. Most important, concentrating steps that adversely affect the stability of MEX are avoided with the SPEM.
journal_name
Ther Drug Monitjournal_title
Therapeutic drug monitoringauthors
Lensmeyer GL,Wiebe DA,Doran TCdoi
10.1097/00007691-199210000-00012subject
Has Abstractpub_date
1992-10-01 00:00:00pages
408-15issue
5eissn
0163-4356issn
1536-3694journal_volume
14pub_type
杂志文章abstract::The effects of the cytochrome P450 (CYP) 2D6 genotype and cigarette smoking on the steady-state plasma concentrations (C(ss)) of fluvoxamine (FLV) and its demethylated metabolite fluvoxamino acid (FLA) were studied in 49 Japanese depressed patients receiving FLV 200 mg/d. The C(ss) of FLV and FLA were measured by HPLC...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-200308000-00008
更新日期:2003-08-01 00:00:00
abstract::During the past two decades, in association with the commencement of chronic dialysis therapy and prolongation of the uremic state, aluminum toxicity has represented a major cause of morbidity and mortality in uremic patients. The uremic patient has been found to be at higher risk of aluminum loading and toxicity from...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章,评审
doi:10.1097/00007691-199312000-00025
更新日期:1993-12-01 00:00:00
abstract:OBJECTIVES:The objective of the present study was to perform an external evaluation of published linezolid population pharmacokinetic and pharmacodynamic models, in order to evaluate the predictive performance using an independent dataset. Another aim was to offer an elegant environment for display and simulation of bo...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/FTD.0000000000000816
更新日期:2020-09-28 00:00:00
abstract::In this report we describe a rapid and sensitive micromethod using high performance liquid chromatography (HPLC) with electrochemical detection (ED) to measure morphine concentration in serum or plasma. The separation of morphine and the internal standard 5-hydroxyquinoline, from interfering compounds present in plasm...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-198208000-00010
更新日期:1982-01-01 00:00:00
abstract::Hair testing procedures allow a cumulative reflection of long-term drug abuse and are useful as a test for compliance in clinical toxicology. In the present study, liquid chromatography coupled with tandem mass spectrometry was used to determine analgesic opioid drugs in hair samples. The procedure used a simple metha...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/FTD.0b013e318155a329
更新日期:2007-10-01 00:00:00
abstract::The authors describe a rapid, useful, specific, and very sensitive high-performance liquid chromatographic assay for the determination of fluvastatin (FV) level using atorvastatin as the internal standard (IS). After a simple deproteinization of 1.0 mL of plasma with acetonitrile, the drug and IS were extracted with t...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-200302000-00013
更新日期:2003-02-01 00:00:00
abstract::The enantioselectivity of hydroxylation of nortriptyline (NT) to E-10-hydroxynortriptyline (E-10-OH-NT) was studied in human liver microsomes, intestinal homogenate, and patients treated with NT. The rate of formation of (-)-E-10-OH-NT was higher than that of (+)-E-10-OH-NT both in the liver microsomes and in the inte...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-199105000-00001
更新日期:1991-05-01 00:00:00
abstract::Major advances in immunosuppression and reductions in the rates of acute rejection have led to increasing graft and patient survival rates during the past two decades. Chronic dysfunction of the renal allograft, however, remains a major clinical problem and probably represents the end result of the complex interplay b...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章,评审
doi:10.1097/00007691-200202000-00007
更新日期:2002-02-01 00:00:00
abstract::Several studies have reported that the cytochrome P450 (CYP) 2D6 plays an important role in the fluvoxamine metabolism. However, some other studies have reported that the CYP2D6 genotype has no major impact on the fluvoxamine concentration. This study investigated the dose-dependent effect of CYP2D6-variant alleles on...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/FTD.0b013e31818d73b3
更新日期:2008-12-01 00:00:00
abstract:BACKGROUND:Infliximab is a chimeric monoclonal antibody that binds to human tumor necrosis factor alpha and which is approved for refractory spondyloarthritis (SpA). Individual adjustment of infliximab dosage may help to improve the therapeutic response in SpA. We investigated whether a knowledge of infliximab serum co...
journal_title:Therapeutic drug monitoring
pub_type: 临床试验,杂志文章
doi:10.1097/FTD.0b013e318224f83d
更新日期:2011-08-01 00:00:00
abstract::The effect of nonlinear kinetics on the steady-state ratio of serum phenytoin (PHT) to total 5-(p-hydroxyphenyl)-5-phenylhydantoin (p-HPPH) was studied in epileptic patients. In each patient, the ratio increased in a nonlinear fashion in relation to both the PHT dose and the PHT serum level. Patients with longer appar...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-198512000-00007
更新日期:1985-01-01 00:00:00
abstract::The efficacy of low-dose, ritonavir-boosted saquinavir (SQV/rtv) once daily plus 2 nucleoside retrotranscriptase inhibitors (NRTIs) in pregnant human immunodeficiency virus (HIV)-1-infected women was prospectively evaluated, ensuring a SQV minimum concentration (Cmin) >/=100 ng/mL with a therapeutic drug monitoring st...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章,多中心研究
doi:10.1097/FTD.0b013e31803bb54e
更新日期:2007-04-01 00:00:00
abstract::One tablet containing 755 mg of lithium tryptophanate (10.8 mEq of lithium) was administered to eight healthy volunteers. The main pharmacokinetic parameters for the group of subjects were estimated. Pharmacokinetic parameters (mean +/- SD) from plasma and saliva were respectively: half life (t1/2) 17 +/- 6 vs. 21.8 +...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-198803000-00004
更新日期:1988-01-01 00:00:00
abstract::Monitoring plasma concentrations of therapeutic drugs presents special problems when these drugs are metabolized to compounds that have pharmacologic activity. This presentation reviews several methods for evaluating the pharmacologic activity of drug metabolites and describes the impact of active drug metabolites on ...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章,评审
doi:10.1097/00007691-198001000-00004
更新日期:1980-01-01 00:00:00
abstract::Effect of diabetes mellitus on mycophenolic acid (MPA) pharmacokinetics and catalytic activity of inosine monophosphate dehydrogenase (IMPDH) was investigated in maintenance kidney transplant recipients. Demographically matched diabetic (n=9) and nondiabetic (n=9) patients were included in a 12-hour open-label, steady...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/FTD.0b013e31815d8ace
更新日期:2007-12-01 00:00:00
abstract:BACKGROUND:The anticonvulsant properties of phenytoin (PHT) were discovered in 1938. Since then, it has been one of the most widely used antiepileptic drugs. It is slowly absorbed, extensively plasma protein-bound, exhibits a nonlinear, concentration-dependent pharmacokinetic profile, and has a narrow therapeutic range...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/FTD.0b013e3182081089
更新日期:2011-02-01 00:00:00
abstract::This investigation was designed to compare three assay techniques, the traditional bioassay (agar diffusion), and two more recent techniques, high-performance liquid chromatography (HPLC) and fluorescence polarization immunoassay (FPIA), for the determination of vancomycin concentrations in serum. One hundred clinical...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-198406000-00019
更新日期:1984-01-01 00:00:00
abstract::Mycophenolate mofetil (MMF) in combination with cyclosporine (CsA) or Tacrolimus (TAC) has been show to be a potent immunosuppressive agent. The authors assessed the mycophenolic acid (MPA) plasma levels achieved in clinical practice and evaluated the effect of concomitant administration of CsA and TAC . One hundred f...
journal_title:Therapeutic drug monitoring
pub_type: 临床试验,杂志文章
doi:10.1097/00007691-200102000-00007
更新日期:2001-02-01 00:00:00
abstract::Levels of the anticonvulsant drugs phenobarbitone, phenytoin, carbamazepine, and primidone were measured in the plasma and saliva of 202 epileptic children (5 months-18 years old). Gas-liquid chromatography (GLC) and EMIT immunoassay were used to analyse the samples. Saliva to plasma ratios were as follows (means +/- ...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-198102000-00006
更新日期:1981-01-01 00:00:00
abstract::Monitoring of serum voriconazole concentrations has been proposed to optimize therapeutic effect and minimize toxicity. However, little is known about the clinical use of voriconazole therapeutic drug monitoring (TDM) by treating physicians. Four hundred seventy-eight episodes corresponding with 161 adult patients (me...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/FTD.0b013e3181ea3de6
更新日期:2010-10-01 00:00:00
abstract::The current article describes a new assay to measure thiopurine methyltransferase (TPMT) activity from red blood cells. This method is based on the measurement of the reaction product 6-methylmercaptopurine (6-MMP) by high-performance liquid chromatography (HPLC). 6-MMP is extracted by ethyl acetate with recoveries of...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-200110000-00007
更新日期:2001-10-01 00:00:00
abstract::Therapeutic drug monitoring in antituberculosis chemotherapy may play a strategic role in improving outcomes in selected patients. The most important use is in assisting clinicians to optimize therapy to achieve success and minimize toxicity. The other principal indication lies in the management of interaction of anti...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章,评审
doi:10.1097/00007691-199810000-00004
更新日期:1998-10-01 00:00:00
abstract:BACKGROUND:Recent studies suggest that 5-fluorouracil (5-FU) dosing by use of pharmacokinetic (PK) parameters is superior to the traditional body surface area (BSA) method in colorectal cancer therapy. The purpose of this study was to compare the estimated efficacy and toxicity of the use of PK-guided versus BSA-based ...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章,meta分析
doi:10.1097/FTD.0000000000000238
更新日期:2016-02-01 00:00:00
abstract::Thiopurine methyltransferase (TPMT) is a cytoplasmic enzyme that preferentially catalyzes the S-methylation of aromatic and heterocyclic sulphydryl compounds, such as the thiopurine drugs azathioprine, mercaptopurine, and thioguanine. These drugs form the same terminal metabolites, the thioguanine nucleotides (TGNs). ...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章,评审
doi:10.1097/00007691-199810000-00014
更新日期:1998-10-01 00:00:00
abstract::A simple and rapid reversed-phase C-18 high-performance liquid chromatography (HPLC) assay without a prior extraction step for dihydroquinidine (HQD) in serum is described. The method is selective and useful for monitoring HQD and its presumed metabolites, quinidine (QD), N-oxide QD, 3-hydroxy QD (3-OHQD), and 10-11-d...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-198412000-00017
更新日期:1984-01-01 00:00:00
abstract::The aim of this study was to investigate the use of psychotropic medication and therapeutic drug monitoring in a high-security psychiatric unit and to compare the doses and serum concentrations both with the recommended intervals and with the doses and serum concentrations in a control group. One hundred thirty-two pa...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/FTD.0b013e31818622c4
更新日期:2008-10-01 00:00:00
abstract::A study was conducted to determine whether assay-specific quantitative differences exist in the determination of vancomycin serum concentrations obtained from patients with renal dysfunction. Vancomycin serum concentrations were obtained during the first week of therapy for each of three time intervals: 48-96 h, 96-14...
journal_title:Therapeutic drug monitoring
pub_type: 临床试验,杂志文章
doi:10.1097/00007691-199612000-00004
更新日期:1996-12-01 00:00:00
abstract::An isocratic, high-performance liquid chromatography method has been developed for simultaneous determination of the tricyclic antidepressant clomipramine and six metabolites: desmethylclomipramine, 2- and 8-hydroxy-clomipramine, 2- and 8-hydroxydesmethylclomipramine and didesmethyl-clomipramine in plasma and urine. I...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-199304000-00010
更新日期:1993-04-01 00:00:00
abstract::After observing the phenomenon clinically, seven post-hemodialysis patients were studied for a rebound effect of gentamicin levels. Serum gentamicin levels were obtained immediately after dialysis and 1 hr postdialysis. An average 25.7% rebound occurred in the serum levels. A slow redistribution of gentamicin out of t...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-198204000-00015
更新日期:1982-01-01 00:00:00
abstract::Amprenavir is an HIV-1 protease inhibitor with high protein binding (90%) in human plasma. This study was designed to develop an assay to measure the concentration of unbound amprenavir, to study variation with time in patients, and to investigate whether ritonavir and lopinavir, other protease inhibitors that could b...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/01.ftd.0000188018.26680.98
更新日期:2006-02-01 00:00:00