Validation of a Physiological Based Pharmacokinetic Model by the Study of Paracetamol Distribution in the Brain Compartments in Brain Injured Patients
Abstract
Brain is composed of several anatomical compartments separated by physiological barriers allowing the maintenance of homeostasis. Furthermore, brain-barriers restrain the diffusion of some drugs in cerebro spinal fluid (CSF) and in extracellular fluid (ECF) of brain tissue, making the development and optimization of dosing regimen of new drugs difficult. Most dosing regimen are determined from the plasma concentration because target site concentrations are difficult to obtain in the brain, hence making the prediction of the therapeutic effect, the adverse effect and the toxicity of a brain- diffused drug difficult. Although quantitative and qualitative differences exist in the processes governing pharmacokinetic (PK) in CSF and brain tissue, CSF is considered as the best surrogate of drugs penetration in the human brain.
A study previously published has evaluated in rats the cerebral distribution of paracetamol, used as a marker of passive diffusion in the ECF by microdialysis in the striatum and in the CSF by microdialysis in the ventricular lateralis and the cistern magna. Authors chose paracetamol, as it has the property to diffuse passively and rapidly in the central nervous system allowing the exclusive description of the relationship between the different compartments of the brain. This study has first revealed an unexpected important difference between the distribution profiles obtained in ECF and CSF. Based on these results, authors developed a physiologically based…
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Evidence Hub reads this as a clinical trial, done in people. Its evidence level is 3 of 5 (Moderate · trial / cohort / secondary analysis). Trials without a large randomized design, cohorts and secondary analyses give moderate evidence. Reported size: 17 participants or records.
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