Abstract:
BACKGROUND:Fat-free mass (FFM)-based dose scaling is increasingly being adopted in clinical pharmacology. Given the complexities with the measurement of FFM in clinical practice, choosing an appropriate equation for FFM is critical for accurate dose scaling. Janmahasatian's FFM model (FFMJan) has largely remained the preferred choice because of its mechanistic basis and good predictive properties. This model was, however, developed from a largely European cohort and has been shown to give biased predictions of FFM in Indian people. OBJECTIVE:The objective of this work was to derive an extended version of the FFMJan model (FFMExt) that accounts for the variation in body composition due to ethnicity, and to demonstrate its application by developing an extended FFM model in an Indian population (FFMExt,Ind). METHODS:The fundamental assumption of FFMJan model development was a linear relationship between bioimpedance and body mass index. In this extension to Janmahasatian's work, this assumption was extended to allow for potential non-linear relationships. While the original ZJan model parameters were kept fixed, a set of body composition-related parameters [Formula: see text] were incorporated, where [Formula: see text] and [Formula: see text] were the ethnicity factors to the intercept and the linear coefficient, respectively, and [Formula: see text] a non-linear exponent. The model was then applied to data arising from a south Indian population and the [Formula: see text] parameters were estimated by standard non-linear regression. The data were generated from a reference model for FFM for the Indian population, which was known to provide unbiased estimates for this population. RESULTS:The parameter estimates (%RSE) of the final FFMExt,Ind model were [Formula: see text] (fixed), [Formula: see text] (3.2%) for male patients, 0.70 (3.3%) for female patients, and [Formula: see text] (12.4%). The final model predictions were in good agreement with the reference model predictions. CONCLUSIONS:An FFMExt model has been achieved by extending the original FFMJan model assumptions to account for inter-ethnic differences in body composition. The extended model can be applied to any ethnic population by estimating a set of body composition-related parameters [Formula: see text]. This can be performed using bioimpedance data without the need for formal FFM measurements.
journal_name
Clin Pharmacokinetjournal_title
Clinical pharmacokineticsauthors
Sinha J,Al-Sallami HS,Duffull SBdoi
10.1007/s40262-020-00883-1subject
Has Abstractpub_date
2020-09-01 00:00:00pages
1161-1170issue
9eissn
0312-5963issn
1179-1926pii
10.1007/s40262-020-00883-1journal_volume
59pub_type
杂志文章abstract:BACKGROUND AND OBJECTIVE:Oral levodopa-carbidopa (LC-oral) treatment in advanced Parkinson's disease (PD) is associated with motor complications due to large fluctuations in levodopa plasma concentrations. Levodopa-carbidopa intestinal gel (LCIG) provides individualized continuous levodopa-carbidopa delivery through in...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1007/s40262-015-0265-3
更新日期:2015-09-01 00:00:00
abstract:BACKGROUND AND OBJECTIVES:Bayesian forecasting (BF) methods for tobramycin dose individualisation has not seen widespread clinical adoption, despite being endorsed by clinical practice guidelines. Several freeware and commercial programmes using BF methods are available to support personalised dosing. This study evalua...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章
doi:10.1007/s40262-017-0610-9
更新日期:2018-08-01 00:00:00
abstract::The combination of hepatic artery infusion (HAI) of irinotecan, 5-fluorouracil and oxaliplatin with intravenous cetuximab has safely achieved prolonged survival in colorectal cancer patients with extensive liver metastases and prior treatment. Systemic exposure to the drugs or their main metabolites was determined dur...
journal_title:Clinical pharmacokinetics
pub_type: 临床试验,杂志文章,多中心研究
doi:10.1007/s40262-016-0431-2
更新日期:2017-02-01 00:00:00
abstract::The influence of anaesthesia and surgery on the pharmacokinetics of pethidine (meperidine) was studied in 12 patients. Plasma pethidine concentrations in central venous blood collected during anaesthesia and the ensuing postoperative hours were by gas chromatography with electron capture detection. Postoperative analg...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章
doi:10.2165/00003088-198207020-00004
更新日期:1982-03-01 00:00:00
abstract::A pharmacokinetic study of alpha 1-antitrypsin (ATT) was performed in 2 groups of homozygous PiZ-deficient patients (treated and untreated) and 1 group of healthy volunteers. The distribution of the 131I-labelled protein corresponds to a 3-compartment model. The intravenously administered protein diffused quickly to t...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章
doi:10.2165/00003088-199223020-00007
更新日期:1992-08-01 00:00:00
abstract:BACKGROUND AND OBJECTIVE:This study proposes a model-informed approach for therapeutic drug monitoring (TDM) of rifampicin to improve tuberculosis (TB) treatment. METHODS:Two datasets from pulmonary TB patients were used: a pharmacokinetic study (34 patients, 373 samples), and TDM data (96 patients, 391 samples) colle...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章
doi:10.1007/s40262-018-00732-2
更新日期:2019-06-01 00:00:00
abstract::The combination of artemether and lumefantrine (benflumetol) is a new and very well tolerated oral antimalarial drug effective even against multidrug-resistant falciparum malaria. The artemether component is absorbed rapidly and biotransformed to dihydroartemisinin, and both are eliminated with terminal half-lives of ...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章,评审
doi:10.2165/00003088-199937020-00002
更新日期:1999-08-01 00:00:00
abstract::Although activity of cytochrome P450 isoenzymes (CYPs) plays a major role in the fate of anticancer agents in patients, there are relatively few clinical studies that evaluate drug metabolism with therapeutic outcome. Nevertheless, many clinical reports in various non-oncology fields have shown the dramatic importance...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章,评审
doi:10.2165/00003088-200544040-00002
更新日期:2005-01-01 00:00:00
abstract::This review examines the literature on drug interactions with omeprazole. Different mechanisms have been proposed as potential causes for such interactions. First, the absorption of some drugs might be altered due to the decreased intragastric acidity resulting from omeprazole treatment. There was no effect of omepraz...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章,评审
doi:10.2165/00003088-199121030-00004
更新日期:1991-09-01 00:00:00
abstract::In the drug therapy of cardiac emergencies, it is necessary to rapidly achieve therapeutic drug concentrations and adjust drug dose as the patient's clinical status changes. Cardiac dysfunction is often present and may alter drug pharmacokinetics. Circulatory failure causes sympathetically mediated vasoconstriction in...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章,评审
doi:10.2165/00003088-198409040-00001
更新日期:1984-07-01 00:00:00
abstract:OBJECTIVE:To study the pharmacokinetics of micafungin in intensive care patients and assess pharmacokinetic (PK) target attainment for various dosing strategies. METHODS:Micafungin PK data from 20 intensive care unit patients were available. A population-PK model was developed. Various dosing regimens were simulated: ...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章
doi:10.1007/s40262-017-0509-5
更新日期:2017-10-01 00:00:00
abstract:BACKGROUND AND OBJECTIVE:Iron-rich transfusions and/or a compensatory increase in iron absorption ultimately result in iron loading in patients with β-thalassaemia. Hence, without iron chelation, iron accumulates relentlessly. Deferiprone has been shown to be capable of reducing the iron burden in patients with β-thala...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章
doi:10.2165/11536630-000000000-00000
更新日期:2011-01-01 00:00:00
abstract:BACKGROUND AND OBJECTIVE:Proprotein convertase subtilisin/kexin type 9 inhibition with monoclonal antibodies such as alirocumab significantly reduces low-density lipoprotein-cholesterol levels ± other lipid-lowering therapies. We aimed to develop and qualify a population pharmacokinetics (PopPK) model for alirocumab in...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章,meta分析
doi:10.1007/s40262-016-0505-1
更新日期:2017-10-01 00:00:00
abstract::Measurement of drug levels is becoming increasingly popular to optimise the dosage of various drugs. In the case of antiarrhythmic drugs, the narrow therapeutic margin of most of these agents and a direct relationship between their pharmacological effects and plasma concentrations would justify more widespread use of ...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章,评审
doi:10.2165/00003088-198308010-00004
更新日期:1983-01-01 00:00:00
abstract::For propofol clearance, allometric scaling has been applied successfully for extrapolations between species (rats and humans) and within the human bodyweight range (children and adults). In this analysis, the human bodyweight range is explored to determine for which range an allometric model with a fixed or estimated ...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章
doi:10.2165/11319350-000000000-00000
更新日期:2010-04-01 00:00:00
abstract:OBJECTIVE:To explore the ability of the nonparametric expectation maximisation (NPEM) method of population pharmacokinetic modelling to deal with sparse data in estimating systemic caffeine clearance for monitoring and evaluation of cytochrome P450 (CYP) 1A2 activity. DESIGN AND PARTICIPANTS:Nonblind, single-dose clin...
journal_title:Clinical pharmacokinetics
pub_type: 临床试验,杂志文章
doi:10.2165/00003088-200342150-00006
更新日期:2003-01-01 00:00:00
abstract:BACKGROUND:Pemetrexed is used for the treatment for non-small cell lung cancer and mesothelioma. Patients with renal impairment are withheld treatment with this drug as it is unknown what dose is well tolerated in this population. OBJECTIVE:The purpose of our study was to investigate the pharmacokinetics (PK) of pemet...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章
doi:10.1007/s40262-020-00972-1
更新日期:2021-01-09 00:00:00
abstract::The classic approach to describe the pharmacological response to a drug is to analyse its concentration-effect relationship, using a variety of possible models such as maximum effect (Emax) models or sigmoid Emax models. The aim of this review is to discuss an alternative way of describing the pharmacological effect i...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章,评审
doi:10.2165/00003088-199936050-00005
更新日期:1999-05-01 00:00:00
abstract:BACKGROUND:International Conference on Harmonization of Technical Requirements for Registration of Pharmaceuticals for Human Use (ICH) guidelines emphasize the need for better understanding of the influence of ethnicity on drug response to minimize duplication of clinical studies, thereby expediting drug approval. OBJ...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章
doi:10.1007/s40262-013-0089-y
更新日期:2013-12-01 00:00:00
abstract:OBJECTIVE:To analyse the influence of covariates on the apparent clearance (CL) of tacrolimus in paediatric liver transplant recipients being converted from cyclosporin to tacrolimus. DESIGN:Retrospective modelling study. PATIENTS AND PARTICIPANTS:18 children, 13 girls and 5 boys, aged 4 months to 16 years (median 9....
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章
doi:10.2165/00003088-200140010-00005
更新日期:2001-01-01 00:00:00
abstract:BACKGROUND:Tildrakizumab is an anti-interleukin-23p19 monoclonal antibody recently approved for the treatment of chronic plaque psoriasis. METHODS:This analysis characterizes the population pharmacokinetics of subcutaneous tildrakizumab and identifies covariates influencing exposure in 2098 healthy volunteers and subj...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章,随机对照试验
doi:10.1007/s40262-019-00743-7
更新日期:2019-08-01 00:00:00
abstract::There are many pathological changes in patients with cystic fibrosis (CF) which can lead to alterations in drug disposition. Although, in patients with CF, the extent of drug absorption varies widely and the rate of absorption is slower, bioavailability is not altered. Plasma protein binding for the majority of drugs ...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章,评审
doi:10.2165/00003088-199835040-00004
更新日期:1998-10-01 00:00:00
abstract::The pharmacokinetics and cardiovascular effects of the calcium entry blocker nisoldipine (10 mg twice daily) were studied in 6 patients with renal failure (creatinine clearance 23 +/- 9 ml/min) and 6 healthy control subjects after a single dose and 1 week of oral administration. No significant differences in eliminati...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章
doi:10.2165/00003088-198916010-00004
更新日期:1989-01-01 00:00:00
abstract::The elderly are generally considered to be different from young people in terms of drug response and this applies particularly to quantitative differences. While altered drug handling is a major potential source of difference in responsiveness to drugs, the relative contribution of pharmacokinetics and pharmacodynamic...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章,评审
doi:10.2165/00003088-197601040-00003
更新日期:1976-01-01 00:00:00
abstract::Modifications to bodily functions and physiology are known to occur with age. These changes can have a considerable impact on the pharmacokinetic processes of absorption, distribution, metabolism and excretion and the pharmacodynamic properties of administered drugs. For many drugs with a high therapeutic index, this ...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章,评审
doi:10.2165/00003088-200342140-00003
更新日期:2003-01-01 00:00:00
abstract::There is a considerable range in the dose of many drugs that is required to produce a given pharmacological effect in an individual patient. This individual variation in dose requirement is sometimes reflected in the wide scatter in the steady state plasma concentration that follows the same oral dose of a drug given ...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章,评审
doi:10.2165/00003088-197702010-00004
更新日期:1977-01-01 00:00:00
abstract:BACKGROUND AND OBJECTIVES:NXY-059 (disufenton sodium, Cerovive, a nitrone with neuroprotective and free radical trapping properties (in experimental stroke) is under development for the treatment of acute stroke. The objectives of this study were to develop a population pharmacokinetic model for NXY-059 in acute stroke...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.2165/00003088-200544080-00007
更新日期:2005-01-01 00:00:00
abstract::Few of the articles published on antibiotics and pregnancy are concerned with pharmacokinetics. It is particularly difficult to evaluate possible alterations in pharmacokinetic parameters that may be due to pregnancy. Most data available have been obtained in connection with abortion or delivery. Such data may not be ...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章,评审
doi:10.2165/00003088-197904040-00003
更新日期:1979-07-01 00:00:00
abstract::Escitalopram is the (S)-enantiomer of the racemic selective serotonin reuptake inhibitor antidepressant citalopram. Clinical studies have shown that escitalopram is effective and well tolerated in the treatment of depression and anxiety disorders. Following oral administration, escitalopram is rapidly absorbed and rea...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章,评审
doi:10.2165/00003088-200746040-00002
更新日期:2007-01-01 00:00:00
abstract:BACKGROUND:Reducing the dose of efavirenz can improve safety, reduce costs, and increase access for patients with HIV infection. According to the World Health Organization, a similar dosing strategy for all patient populations is desirable for universal roll-out; however, it remains unknown whether the 400 mg daily dos...
journal_title:Clinical pharmacokinetics
pub_type: 杂志文章
doi:10.1007/s40262-018-0642-9
更新日期:2018-11-01 00:00:00