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Published in: Clinical Pharmacokinetics 5/2006

01-05-2006 | Review Article

The Influence of Cardiovascular Physiology on Dose/Pharmacokinetic and Pharmacokinetic/Pharmacodynamic Relationships

Authors: Dr Pietro Fagiolino, Rosa Eiraldi, Marta Vázquez

Published in: Clinical Pharmacokinetics | Issue 5/2006

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Abstract

Inter- and intraindividual variability in the relationship between dose and clinical — or pharmacodynamic — response of a drug can be analysed in two steps: firstly, by considering the plasma pharmacokinetic response to a given dose and, secondly, by the connection between both pharmacokinetic and pharmacodynamic responses.
As the cardiovascular system is the means of transport of endogenous and exogenous substances, blood flow fraction destined to each organ determines the relative mass of solute in plasma, which is constantly in contact with the tissue. Hence, not only the rate but also the extent of drug transfer would be increased when tissues are irrigated by a higher fraction of cardiac output.
Aging and circadian rhythms present similar cardiac output distribution patterns when moving from young to aged adult and from nocturnal to diurnal hours. These two changes lead to an increased blood flow delivery to the extra-splanchnic-renal region in the elderly and in the morning, but with a decreased cardiac output in aged individuals and an increased one during the day.
This scenario allows us to forecast substance concentrations outside the blood vessels, which are responsible for the extent of drug elimination and the intensity of drug effect. So available data on disposition and pharmacodynamics of drugs might be explained from another point of view that challenges current knowledge. Furthermore, the administration of cardiovascular active drugs might reverse the chronological sequence between pharmacokinetic and pharmacodynamic responses, since they could modify blood flow distribution.
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Metadata
Title
The Influence of Cardiovascular Physiology on Dose/Pharmacokinetic and Pharmacokinetic/Pharmacodynamic Relationships
Authors
Dr Pietro Fagiolino
Rosa Eiraldi
Marta Vázquez
Publication date
01-05-2006
Publisher
Springer International Publishing
Published in
Clinical Pharmacokinetics / Issue 5/2006
Print ISSN: 0312-5963
Electronic ISSN: 1179-1926
DOI
https://doi.org/10.2165/00003088-200645050-00001

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