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A pharmacokinetic-pharmacodynamic model for duodenal levodopa infusion
Dalarna University, School of Technology and Business Studies, Computer Engineering.ORCID iD: 0000-0003-0403-338X
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2011 (English)In: Clinical neuropharmacology, ISSN 0362-5664, E-ISSN 1537-162X, Vol. 32, no 2, 61-65 p.Article in journal (Refereed) Published
Abstract [en]

Objective: The purpose of this work was to identify and estimate a population pharmacokinetic- pharmacodynamic model for duodenal infusion of a levodopa/carbidopa gel (Duodopa) to examine pharmacological properties of this treatment.

Methods: The modeling involved pooling data from 3 studies (on advanced Parkinson disease) and fixing some parameters to values found in literature. The first study involved 12 patients studied on 3 occasions each and was previously published. The second study involved 3 patients on 2 occasions. A bolus dose was given after a washout during night. Plasma samples and motor ratings (clinical assessment of motor function on a 7-point treatment response scale ranging from "very off" to "very hyperkinetic") were collected until the clinical effect returned to baseline. The third study involved 5 patients on 3 occasions receiving 5 different dose levels. Different structural models were evaluated using the nonlinear mixed-effects modeling program NONMEM VI. Population mean parameter values, and interindividual, interoccasion, and residual variabilities were estimated.

Results: Absorption of the levodopa/carbidopa gel can be adequately described with first-order absorption with bioavailability and lag time. Estimated population parameter values were a mean absorption time of 28.5 minutes, a lag time of 2.9 minutes, and a bioavailability of 88%. The pharmacodynamic model for motor ratings had the following population values: a half-life of effect delay of 21 minutes, a concentration at 50% effect of 1.55 mg/L, an Emax of 2.39 U on the treatment response scale, and a sigmoidicity of the Emax function of 11.6.

Conclusions: For the typical unmedicated subject, it will take 51.4 minutes until the peak levodopa effect is reached after a bolus dose. This delay is, like the magnitude of the effect, highly variable in this patient group. The residual error magnitudes of 20% for levodopa concentrations and 0.92 U (SD) for motor ratings indicate that the models developed provide predictions of a relevant quality. The developed model may be a first step toward model-guided treatment individualization of duodenal infusion of levodopa.

Place, publisher, year, edition, pages
Lippincott: Williams & Wilkins , 2011. Vol. 32, no 2, 61-65 p.
Keyword [en]
levodopa, infusion, Parkinson disease, pharmacokinetic, pharmacodynamic
National Category
Computer Engineering Clinical Medicine
Research subject
Komplexa system - mikrodataanalys, E-MOTIONS, Beslutsstöd för Parkinsonbehandling
Identifiers
URN: urn:nbn:se:du-5728DOI: 10.1097/WNF.0b013e31820b570aISI: 000288445400002OAI: oai:dalea.du.se:5728DiVA: diva2:520400
Available from: 2011-08-25 Created: 2011-08-25 Last updated: 2015-06-16Bibliographically approved

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CiteExportLink to record
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Citation style
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