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  • 1
    ISSN: 1432-1041
    Keywords: Population pharmacokinetics ; Pharmacodynamics ; experimental design ; drug development ; clinical trials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract An expert meeting to discuss issues relating to the design of population pharmacokinetic/pharmacodynamic (PK/PD) studies was held in Brussels in March 1995, under the auspices of the European Co-operation in Science and Technology (COST), Medicine (B1) programme. The purpose of the meeting was to discuss the experts' experience in designing and performing population PK/PD studies. The topics discussed were current practice, logistical issues, ensuring the accuracy of data, covariate assessment, communication, and protocol design. The main conclusions from the meeting were: 1) a population PK/PD analysis should be one of the objectives of a clinical trial and should not compromise the other objectives; 2) it is particularly important to communicate the purpose of the population PK/PD analysis to the investigators and to convince them of the importance of accurately recording dosing and sampling times; 3) some prior knowledge of the PK and PD models and covariate relationships is necessary for the analysis of sparse phase III data; 4) computer simulation and optimal design measures may be useful in defining sampling times; 5) population methods and objectives must be specified as completely as possible in the protocol. Participants: L. Aarons (UK), L. Balant (Switzerland), P. Bechtel (France), R. Bruno (France), P. Burtin (Switzerland), C. Dubruc (France), E. Fuseau (UK), J. Gabrielsson (Sweden), U. Gundert-Remy (Germany), R. Jochemsen (France), M. Karlsson (Sweden), C. Laveille (France), I. Meineke (Germany), F. Mentré (France), P. Morselli (France), G. Paintaud (France), A. Racine-Poon (Switzerland), J. Rodriguez (Spain), F. Rombout (The Netherlands), M. Rowland (UK), J.-L. Steimer (Switzerland), A. Van Peer (Belgium), S. Vozeh (Switzerland), W. Weber (Germany), B. Wittke (Switzerland) The views expressed by the participants do not necessarily reflect those of the organizations they represent.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 38 (1990), S. 509-513 
    ISSN: 1432-1041
    Keywords: Propafenone ; metabolism ; non-linear pharmacokinetics ; 5-hydroxypropafenone ; N-depropylpropafenone ; saturable biliary excretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary. The pharmacokinetics of oral and i. v. propafenone and its major metabolites have been investigated in 8 healthy subjects. The total body clearance of propafenone was 963 ml/min, the terminal half-life 198 min and its absolute bioavailability was 15.5%. The two active metabolites (5-hydroxypropafenone and N-depropylpropafenone) showed non-linear kinetics in that both the dose-corrected area under the serum concentration-time curve and the amount excreted in the urine were larger after oral dosing. This resulted in considerably higher serum concentrations of the metabolites despite comparable serum concentrations of the parent compound. Thus, the concentration-effect relationship in the same patient may differ after oral and intravenous doses if concentrations of the active metabolite(s) are not taken into consideration. Although the mechanism of the nonlinearity is not clear, the data indicate that it may be due to saturable biliary excretion of the metabolites.
    Type of Medium: Electronic Resource
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