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 apparent PHT half-lives (t50%) had a higher PHT/p-HPPH ratio. The t50% was either measured directly and found to correlate well with the patient's calculated Michaelis-Menten parameters (Vmax and Km), or was calculated from Vmax and Km values. A close linear correlation was found between the steady-state PHT/p-HPPH ratio and t50% values, interindividually and intraindividually, i.e., as the t50% increased with increasing PHT concentration in a given patient, the PHT/p-HPPH ratio increased in the same proportion. This indicates a good correlation between the overall Michaelis-Menten kinetics of PHT elimination and the PHT/p-HPPH ratio. A close linear correlation between a wide range of PHT doses and steady-state serum total p-HPPH levels was found, suggesting that when the PHT dose is lower than Vmax, the fraction of PHT undergoing parahydroxylation is constant. It is concluded that if, in a given patient, the p-HPPH level corresponds to the value expected from the PHT dose, it can be assumed that compliance and bioavailability are adequate and that the dose does not exceed Vmax. In that case, the PHT/p-HPPH ratio will provide a good estimate of the t50% of PHT at that particular PHT level.
journal_name
Ther Drug Monitjournal_title
Therapeutic drug monitoringauthors
Bourgeois BF,Wad Ndoi
10.1097/00007691-198512000-00007subject
Has Abstractpub_date
1985-01-01 00:00:00pages
405-10issue
4eissn
0163-4356issn
1536-3694journal_volume
7pub_type
杂志文章abstract::A case of desmethylimipramine (DMI) overdose is described. The analysis of DMI and its main metabolite, 2-hydroxydesmethylimipramine (2-OH-DMI), in plasma was performed by high performance liquid chromatography with fluorescence detection. Characterization of the elimination kinetics of DMI by using the SAAM 25 comput...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:
更新日期:1985-01-01 00:00:00
abstract::The high incidence of psychiatric illness in the postpartum period and the increasing percentage of women who breastfeed has focused attention on the treatment of breastfeeding women with psychotropic medications and, additionally, the exposure of nursing infants to these medications. Consequently, there has been an i...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-200402000-00011
更新日期:2004-02-01 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::A neurophysiologic test battery (consisting of a 24-hour, seven-channel electroencephalogram [EEG], EEG spectral analysis, multiple sleep latency test, visual evoked potentials, critical flicker fusion, and visual contrast sensitivity) was administered twice to 16 patients with juvenile myoclonic epilepsy (JME) in a d...
journal_title:Therapeutic drug monitoring
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00007691-199902000-00014
更新日期:1999-02-01 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::The relationship between changes in cyclosporin (CyA) dose or CyA blood concentration and the reciprocal creatinine concentration was investigated by cross-correlation analysis over the first 3 postoperative months in 32 consecutive heart and heart-lung recipients. Exploratory analysis suggested that early changes in ...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-199208000-00003
更新日期:1992-08-01 00:00:00
abstract:BACKGROUND:The indication for the antiepileptic drug lacosamide (LCM) was recently extended to include children from the age of 4 years. Real-life data on the use and serum concentrations of LCM in children and adolescents are limited. The purpose of this study was to investigate the use of LCM in this patient group in...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/FTD.0000000000000599
更新日期:2019-06-01 00:00:00
abstract::For the evaluation and interpretation of pharmacokinetic data reliable quantitative determinations are a requirement that can only be met by well-characterized and fully validated analytical methods. To cope with these requirements a method is being established that is based on an integrated and automated fiber-optic ...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-199608000-00017
更新日期:1996-08-01 00:00:00
abstract::The selection of an appropriate therapy and dosing regimen is a significant challenge in the treatment of cancer. Although there are recommended standardized chemotherapy protocols for some types of cancer, protocol changes that usually only occur after large clinical trials demonstrate improvements and individual pat...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/FTD.0000000000000701
更新日期:2020-02-01 00:00:00
abstract::Epilepsy is characterized by seizures recurring at interindividually differing time intervals. It may be difficult to assess drug response if time intervals between seizures are long. Thus, the existence of surrogate parameters that could be used to reliably identify drug efficacy and tolerability at an early stage an...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章,评审
doi:10.1097/FTD.0000000000000623
更新日期:2019-04-01 00:00:00
abstract::An original, sensitive, and specific high-performance liquid chromatographic (HPLC) assay was developed for the quantitation of morphine and its two major metabolites, morphine-3-glucuronide (M3G) and morphine-6-glucuronide (M6G), in human plasma and cerebrospinal fluid (CSF) and in rat plasma, using hydromorphone as ...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-199404000-00016
更新日期:1994-04-01 00:00:00
abstract::Determination of serum concentrations of certain drugs is becoming increasingly important for optimal patient care. These drugs include many antibiotics, several antiarrhythmics, cardiac glycosides, lithium, phenytoin, some other anticonvulsants, salicylates, and theophylline. Serum level determinations can also be us...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章,评审
doi:
更新日期:1981-01-01 00:00:00
abstract::A highly sensitive, specific method for determining chloramphenicol levels in human blood plasma and cerebrospinal fluid is described. The method uses high performance liquid chromatography for the analysis, requires minimal quantities of patient specimen, and thus is suitable for use in newborn and pediatric patients...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-198709000-00016
更新日期:1987-09-01 00:00:00
abstract::It has been suggested that lamotrigine (LTG) may enhance the toxicity of carbamazepine (CBZ) by increasing the concentration of the active metabolite carbamazepine-10,11-epoxide (CBZ-E) in adult patients. The authors investigated this hypothesis in an add-on study in 11 children and 3 adolescents, aged 6-22 years, who...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-199710000-00002
更新日期:1997-10-01 00:00:00
abstract:OBJECTIVE:This naturalistic therapeutic drug monitoring (TDM) study aimed to evaluate the relationship between dosage, serum concentration, and clinical outcome in children and adolescents treated with the serotonin reuptake inhibitor sertraline for different indications. METHODS:Steady-state trough serum concentratio...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/FTD.0b013e31827a1aad
更新日期:2013-02-01 00:00:00
abstract::The pharmacokinetics of oxycodone have been determined after single-dose administration by the intravenous (4.6-7.3 mg), oral (tablets, 9.1 mg and syrup, 9.1 mg), and rectal (30 mg) routes, in 48 patients undergoing minor surgery. There were no significant differences in the mean elimination half-lives between the int...
journal_title:Therapeutic drug monitoring
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00007691-199212000-00008
更新日期:1992-12-01 00:00:00
abstract::A serious challenge in diagnosing fetal alcohol spectrum disorder (FASD) is the need to document alcohol use during pregnancy. Maternal/paternal alcohol abuse affects the likelihood of fetal alcohol exposure, and hence the occurrence of FASD. The objective of the current study was to document the use of the fatty acid...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/FTD.0b013e31819c33b8
更新日期:2009-04-01 00:00:00
abstract::The CYP2D6*10(*10) allele that causes decreased CYP2D6 activity is present in Asians with a high frequency of approximately 50%. We studied the effects of the *10 allele on the steady-state plasma concentrations of aripiprazole and its active metabolite, dehydroaripiprazole. The subjects were 63 Japanese patients with...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/FTD.0b013e3182031021
更新日期:2011-02-01 00:00:00
abstract:INTRODUCTION:Enoxaparin is an anticoagulant used in the treatment of thromboembolic diseases. It is a hydrophilic molecule that is, predominantly, eliminated renally with few data to support dosing for subjects with renal impairment and/or obesity. A recently conducted randomized controlled clinical trial compared indi...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章,随机对照试验
doi:10.1097/FTD.0b013e3181e64846
更新日期:2010-08-01 00:00:00
abstract:BACKGROUND:Desmopressin (D-amino D-arginine vasopressin: dDAVP) is used for the treatment of patients with hemophilia A and Von Willebrand disease. Studies on the rationale of dosing are scarce and mainly focus on the underlying causes of the vast differences in desmopressin response among individuals. The aim of this ...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/FTD.0000000000000791
更新日期:2020-12-01 00:00:00
abstract::Recently, a semiautomated fluorescence polarization immunoassay (FPIA) for determination of parent cyclosporin (CsA) has been developed for the Abbott AxSYM system. The new CsA assay measures the drug from an extracted whole blood specimen. The authors report here the evaluation of this new assay and the comparison wi...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-200008000-00018
更新日期:2000-08-01 00:00:00
abstract::To interpret blood levels of tricyclic antidepressants, we studied the distributions of amitriptyline and nortriptyline in human blood and explored their control by plasma factors. Each compound (300 ng/ml) was added to whole adult blood and to cord blood with decreased alpha-1-glycoprotein (AGP). Drugs (250 ng/ml) we...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-199308000-00002
更新日期:1993-08-01 00:00:00
abstract::Two blood-sampling techniques, capillary and venous, were compared using the EMIT method. No difference was found in reproducibility. However, persistent positive bias of 0.628 micrograms/ml (p less than 0.01) was noted with the capillary sampling method. Any hemolysis that occurred in the capillary sampling technique...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-198303000-00011
更新日期:1983-01-01 00:00:00
abstract:BACKGROUND:Tacrolimus pharmacokinetics in obese patients have been poorly studied. Herein, the authors explored the impact of obesity on tacrolimus exposure in kidney transplant recipients (KTRs) and estimated a more suitable initial dosage in this population. METHODS:A retrospective, observational, monocentric case-c...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/FTD.0000000000000820
更新日期:2020-10-05 00:00:00
abstract:BACKGROUND:Human immunodeficiency virus (HIV)-infected individuals show large interindividual variation in response to antiretroviral therapy. Efavirenz (EFV) and nevirapine (NVP) are nonnucleoside reverse transcriptase inhibitors, which are prescribed in combination with other antiretroviral therapy in so-called highl...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/FTD.0b013e31824868f3
更新日期:2012-04-01 00:00:00
abstract::A rapid and reliable micro procedure for the high pressure liquid chromatographic analysis of cimetidine. N"-cyano-N-methyl-N'-[2-[[(5-methyl-1H-imidazol-4-yl)methyl]thio]ethyl]guanidine, in serum or plasma is described. The percentage analytical recovery of cimetidine and internal standard (beta-hydroxypropyl-theophy...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-197901030-00010
更新日期:1979-01-01 00:00:00
abstract::The clinical use of digoxin and phenytoin analyses (in 405 and 152 patients, respectively) furnished by our clinical pharmacological laboratory during a five-month period was evaluated prospectively from request forms. Of first-time analyses of digoxin, 12, 38, and 50% fell above, within, and below our recommended ran...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-198103000-00006
更新日期:1981-01-01 00:00:00
abstract::There are a number of effective but highly toxic drugs that exhibit a narrow therapeutic index and marked interpatient pharmacokinetic variability. Individualized therapy with such drugs requires therapeutic drug monitoring (TDM) to obtain the desired clinical effects safely. Cost-effectiveness analysis in health care...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章,评审
doi:10.1097/00007691-200502000-00004
更新日期:2005-02-01 00:00:00
abstract::Studies of the antidepressant effect and pharmacokinetics of citalopram have been performed in adults, but the effects on children and adolescents have only been studied to a minor extent despite its increasing use in these age groups. The aim of this study was to investigate a group of adolescents treated for depress...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/00007691-200112000-00011
更新日期:2001-12-01 00:00:00
abstract::A high-performance liquid chromatographic method for the determination of linezolid in human plasma was developed and validated. After precipitation of plasma proteins with perchloric acid, the protein-free supernatant was separated by isocratic reverse-phase chromatography on a X Bridge C18 column. The mobile phase c...
journal_title:Therapeutic drug monitoring
pub_type: 杂志文章
doi:10.1097/FTD.0b013e3181d5eeee
更新日期:2010-08-01 00:00:00